# DSA Class

The DSA (Digital Signature Algorithm) class enables users to generate DSA hash signatures.

## Syntax

```text
ipworksencrypt.DSA
```

## Remarks

The DSA (Digital Signature Algorithm) class enables users to generate DSA hash signatures.

To begin you must either specify an existing key or create a new key. Existing private keys may be specified by setting [Key](#key-property-dsa-class). To create a new key call [CreateKey](#createkey-method-dsa-class). Alternatively an existing certificate may be specified by setting [Certificate](#certificate-property-dsa-class)

**Signing**

To sign data first set [Key](#key-property-dsa-class) or [Certificate](#certificate-property-dsa-class). Select the input file by setting [SetInputStream](#setinputstream-method-dsa-class), [InputFile](#inputfile-property-dsa-class), or [InputMessage](#inputmessage-property-dsa-class). Next call [Sign](#sign-method-dsa-class). The [Sign](#sign-method-dsa-class) method will automatically compute the hash, and then sign the hash with the specified key.

Send the public key (see [CreateKey](#createkey-method-dsa-class) for details), file, and [HashSignature](#hashsignature-property-dsa-class) to the recipient.

To sign a hash without recomputing the hash simply set [HashValue](#hashvalue-property-dsa-class) to the pre-computed hash value before calling [Sign](#sign-method-dsa-class).

**Signature Verification**

To verify a signature specify the input data using [InputFile](#inputfile-property-dsa-class) or [InputMessage](#inputmessage-property-dsa-class). Set [SignerKey](#signerkey-property-dsa-class) or [SignerCert](#signercert-property-dsa-class). Next set [HashSignature](#hashsignature-property-dsa-class) and call [VerifySignature](#verifysignature-method-dsa-class). The [VerifySignature](#verifysignature-method-dsa-class) method will return True if the signature was successfully verified.

To verify a hash signature without recomputing the hash simply set [HashValue](#hashvalue-property-dsa-class) to the pre-computed hash value before calling [VerifySignature](#verifysignature-method-dsa-class).

**Hash Notes**

The class will determine whether or not to recompute the hash based on the properties that are set. If a file is specified by [SetInputStream](#setinputstream-method-dsa-class), [InputFile](#inputfile-property-dsa-class), or [InputMessage](#inputmessage-property-dsa-class), the hash will be recomputed when calling [Sign](#sign-method-dsa-class) or [VerifySignature](#verifysignature-method-dsa-class). If the [HashValue](#hashvalue-property-dsa-class) property is set, the class will only sign the hash or verify the hash signature. Setting [SetInputStream](#setinputstream-method-dsa-class), [InputFile](#inputfile-property-dsa-class), or [InputMessage](#inputmessage-property-dsa-class) clears the [HashValue](#hashvalue-property-dsa-class) property. Setting the [HashValue](#hashvalue-property-dsa-class) property clears the input file selection.

**DSA Key Notes**

A DSA key is made up of a number of individual parameters. When calling [CreateKey](#createkey-method-dsa-class) the [key](#key-property-dsa-class) property is populated with a new private and public key.

After calling [Sign](#sign-method-dsa-class) the public key must be sent to the recipient along with [HashSignature](#hashsignature-property-dsa-class) so they may perform signature verification. Likewise you must obtain the public key along with [HashSignature](#hashsignature-property-dsa-class) in order to perform signature verification.

The public key consists of the following parameters:

- [P](#DSAKey_f_P)
- [Q](#DSAKey_f_Q)
- [G](#DSAKey_f_G)
- [Y](#DSAKey_f_Y)

The class also includes the [PublicKey](#DSAKey_f_PublicKey) field which holds the PEM formatted public key for ease of use. This is helpful if you are in control of both signature creation and verification process. When sending the public key to a recipient note that not all implementations will support using the PEM formatted value in [PublicKey](#DSAKey_f_PublicKey) in which case the individual parameters must be sent.

The private key consists of the following parameters:

- [P](#DSAKey_f_P)
- [Q](#DSAKey_f_Q)
- [G](#DSAKey_f_G)
- [Y](#DSAKey_f_Y)
- [X](#DSAKey_f_X)

 The class also include the [PrivateKey](#DSAKey_f_PrivateKey) field which holds the PEM formatted private key for ease of use. This is helpful for storing the private key more easily..

## Property List

*The following is the full list of the properties of the class with short descriptions. Click on the links for further details.*

|  |  |
| --- | --- |
| [Certificate](#certificate-property-dsa-class) | The certificate used for signing. |
| [HashAlgorithm](#hashalgorithm-property-dsa-class) | The hash algorithm used for hash computation. |
| [HashSignature](#hashsignature-property-dsa-class) | The hash signature. |
| [HashValue](#hashvalue-property-dsa-class) | The hash value of the data. |
| [InputFile](#inputfile-property-dsa-class) | The file to process. |
| [InputMessage](#inputmessage-property-dsa-class) | The message to process. |
| [Key](#key-property-dsa-class) | The DSA key. |
| [SignerCert](#signercert-property-dsa-class) | The certificate used for signature verification. |
| [SignerKey](#signerkey-property-dsa-class) | The public key used to verify the signature. |
| [UseHex](#usehex-property-dsa-class) | Whether HashValue and HashSignature are hex encoded. |

## Method List

*The following is the full list of the methods of the class with short descriptions. Click on the links for further details.*

|  |  |
| --- | --- |
| [Config](#config-method-dsa-class) | Sets or retrieves a configuration setting. |
| [CreateKey](#createkey-method-dsa-class) | Creates a new key. |
| [Reset](#reset-method-dsa-class) | Resets the class. |
| [SetInputStream](#setinputstream-method-dsa-class) | Sets the stream from which the class will read data to encrypt or decrypt. |
| [Sign](#sign-method-dsa-class) | Creates a hash signature. |
| [VerifySignature](#verifysignature-method-dsa-class) | Verifies the signature for the specified data. |

## Event List

*The following is the full list of the events fired by the class with short descriptions. Click on the links for further details.*

|  |  |
| --- | --- |
| [Error](#error-event-dsa-class) | Fired when information is available about errors during data delivery. |
| [Progress](#progress-event-dsa-class) | Fired as progress is made. |

## Config Settings

*The following is a list of config settings for the class with short descriptions. Click on the links for further details.*

|  |  |
| --- | --- |
| [CloseInputStreamAfterProcessing](#CloseInputStreamAfterProcessing) | Determines whether or not the input stream is closed after processing. |
| [HashSignatureFormat](#HashSignatureFormat) | The format of the HashSignature. |
| [KeyFormat](#KeyFormat) | How the public and private key are formatted. |
| [KeySize](#KeySize) | The size, in bits, of the secret key. |
| [BuildInfo](#BuildInfo) | Information about the product's build. |
| [GUIAvailable](#GUIAvailable) | Whether or not a message loop is available for processing events. |
| [LicenseInfo](#LicenseInfo) | Information about the current license. |
| [MaskSensitiveData](#MaskSensitiveData) | Whether sensitive data is masked in log messages. |
| [UseDaemonThreads](#UseDaemonThreads) | Whether threads created by the class are daemon threads. |
| [UseFIPSCompliantAPI](#UseFIPSCompliantAPI) | Tells the class whether or not to use FIPS certified APIs. |
| [UseInternalSecurityAPI](#UseInternalSecurityAPI) | Whether or not to use the system security libraries or an internal implementation. |
| [UseVirtualThreads](#UseVirtualThreads) | Whether threads created by the class use virtual threads instead of platform threads. |

# Certificate Property ([DSA](#dsa-class) Class)

The certificate used for signing.

## Syntax

```text
public Certificate getCertificate();
public void setCertificate(Certificate certificate);
```

## Remarks

This property specifies a certificate with private key.

This may be set instead of [Key](#key-property-dsa-class). This allows a [Certificate](#certificate-type) object to be used instead of a [DSAKey](#dsakey-type) object. This certificate is used when calling [Sign](#sign-method-dsa-class). The specified certificate must have a private key.

If both this property and [Key](#key-property-dsa-class) are specified, [Key](#key-property-dsa-class) will be used and this property will be ignored.

 Please refer to the [Certificate](#certificate-type) type for a complete list of fields.

# HashAlgorithm Property ([DSA](#dsa-class) Class)

The hash algorithm used for hash computation.

## Syntax

```text
public int getHashAlgorithm();
public void setHashAlgorithm(int hashAlgorithm);

Enumerated values:
  public final static int dhaSHA1 = 0;
  public final static int dhaSHA224 = 1;
  public final static int dhaSHA256 = 2;
  public final static int dhaSHA384 = 3;
  public final static int dhaSHA512 = 4;
  public final static int dhaRIPEMD160 = 5;
```

## Default Value

2

## Remarks

This property specifies the hash algorithm used for hash computation. This is only applicable when calling [Sign](#sign-method-dsa-class) or [VerifySignature](#verifysignature-method-dsa-class) and [HashValue](#hashvalue-property-dsa-class) is computed. Possible values are:

|  |  |
| --- | --- |
| 0 (dhaSHA1) | SHA-1 |
| 1 (dhaSHA224) | SHA-224 |
| 2 (dhaSHA256 - default) | SHA-256 |
| 3 (dhaSHA384) | SHA-384 |
| 4 (dhaSHA512) | SHA-512 |
| 5 (dhaRIPEMD160) | RIPEMD-160 |

# HashSignature Property ([DSA](#dsa-class) Class)

The hash signature.

## Syntax

```text
public byte[] getHashSignature();
public void setHashSignature(byte[] hashSignature);
```

## Default Value

""

## Remarks

This property holds the computed hash signature. This is populated after calling [Sign](#sign-method-dsa-class). This must be set before calling [VerifySignature](#verifysignature-method-dsa-class).

# HashValue Property ([DSA](#dsa-class) Class)

The hash value of the data.

## Syntax

```text
public byte[] getHashValue();
public void setHashValue(byte[] hashValue);
```

## Default Value

""

## Remarks

This property holds the computed hash value for the specified data. This is populated when calling [Sign](#sign-method-dsa-class) or [VerifySignature](#verifysignature-method-dsa-class) when an input file is specified by setting [SetInputStream](#setinputstream-method-dsa-class), [InputFile](#inputfile-property-dsa-class), or [InputMessage](#inputmessage-property-dsa-class).

If you know the hash value prior to using the class you may specify the pre-computed hash value here.

**Hash Notes**

The class will determine whether or not to recompute the hash based on the properties that are set. If a file is specified by [SetInputStream](#setinputstream-method-dsa-class), [InputFile](#inputfile-property-dsa-class), or [InputMessage](#inputmessage-property-dsa-class), the hash will be recomputed when calling [Sign](#sign-method-dsa-class) or [VerifySignature](#verifysignature-method-dsa-class). If the HashValue property is set, the class will only sign the hash or verify the hash signature. Setting [SetInputStream](#setinputstream-method-dsa-class), [InputFile](#inputfile-property-dsa-class), or [InputMessage](#inputmessage-property-dsa-class) clears the HashValue property. Setting the HashValue property clears the input file selection.

# InputFile Property ([DSA](#dsa-class) Class)

The file to process.

## Syntax

```text
public String getInputFile();
public void setInputFile(String inputFile);
```

## Default Value

""

## Remarks

This property specifies the file to be processed. Set this property to the full or relative path to the file which will be processed.

**Input and Output Properties**

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

- [SetInputStream](#setinputstream-method-dsa-class)
- InputFile
- [InputMessage](#inputmessage-property-dsa-class)

When a valid source is found, the search stops. The order in which the output properties are checked is as follows:

- SetOutputStream
- OutputFile
- OutputMessage: The output data is written to this property if no other destination is specified.

When using streams, you may need to additionally set [CloseInputStreamAfterProcessing](#CloseInputStreamAfterProcessing) or [CloseOutputStreamAfterProcessing](#CloseOutputStreamAfterProcessing).

# InputMessage Property ([DSA](#dsa-class) Class)

The message to process.

## Syntax

```text
public byte[] getInputMessage();
public void setInputMessage(byte[] inputMessage);
```

## Default Value

""

## Remarks

This property specifies the message to be processed.

**Input and Output Properties**

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

- [SetInputStream](#setinputstream-method-dsa-class)
- [InputFile](#inputfile-property-dsa-class)
- InputMessage

When a valid source is found, the search stops. The order in which the output properties are checked is as follows:

- SetOutputStream
- OutputFile
- OutputMessage: The output data is written to this property if no other destination is specified.

When using streams, you may need to additionally set [CloseInputStreamAfterProcessing](#CloseInputStreamAfterProcessing) or [CloseOutputStreamAfterProcessing](#CloseOutputStreamAfterProcessing).

# Key Property ([DSA](#dsa-class) Class)

The DSA key.

## Syntax

```text
public DSAKey getKey();
public void setKey(DSAKey key);
```

## Remarks

This property specifies the DSA key used to create a signature. This property must be set before calling [Sign](#sign-method-dsa-class). Alternatively, a certificate may be specified by setting [Certificate](#certificate-property-dsa-class)

**DSA Key Notes**

A DSA key is made up of a number of individual parameters. When calling [CreateKey](#createkey-method-dsa-class) the [key](#key-property-dsa-class) property is populated with a new private and public key.

After calling [Sign](#sign-method-dsa-class) the public key must be sent to the recipient along with [HashSignature](#hashsignature-property-dsa-class) so they may perform signature verification. Likewise you must obtain the public key along with [HashSignature](#hashsignature-property-dsa-class) in order to perform signature verification.

The public key consists of the following parameters:

- [P](#DSAKey_f_P)
- [Q](#DSAKey_f_Q)
- [G](#DSAKey_f_G)
- [Y](#DSAKey_f_Y)

The class also includes the [PublicKey](#DSAKey_f_PublicKey) field which holds the PEM formatted public key for ease of use. This is helpful if you are in control of both signature creation and verification process. When sending the public key to a recipient note that not all implementations will support using the PEM formatted value in [PublicKey](#DSAKey_f_PublicKey) in which case the individual parameters must be sent.

The private key consists of the following parameters:

- [P](#DSAKey_f_P)
- [Q](#DSAKey_f_Q)
- [G](#DSAKey_f_G)
- [Y](#DSAKey_f_Y)
- [X](#DSAKey_f_X)

 The class also include the [PrivateKey](#DSAKey_f_PrivateKey) field which holds the PEM formatted private key for ease of use. This is helpful for storing the private key more easily.

 Please refer to the [DSAKey](#dsakey-type) type for a complete list of fields.

# SignerCert Property ([DSA](#dsa-class) Class)

The certificate used for signature verification.

## Syntax

```text
public Certificate getSignerCert();
public void setSignerCert(Certificate signerCert);
```

## Remarks

This property specifies a certificate for signature verification.

This may be set instead of [SignerKey](#signerkey-property-dsa-class). This allows a [Certificate](#certificate-type) object to be used instead of a [DSAKey](#dsakey-type) object. This certificate is used when calling [VerifySignature](#verifysignature-method-dsa-class).

If both this property and [SignerKey](#signerkey-property-dsa-class) are specified, [SignerKey](#signerkey-property-dsa-class) will be used and this property will be ignored.

 Please refer to the [Certificate](#certificate-type) type for a complete list of fields.

# SignerKey Property ([DSA](#dsa-class) Class)

The public key used to verify the signature.

## Syntax

```text
public DSAKey getSignerKey();
public void setSignerKey(DSAKey signerKey);
```

## Remarks

This property specifies the public key used to verify the signature. This public key corresponds to the private key used when creating the signature. This must be set before calling [VerifySignature](#verifysignature-method-dsa-class). Alternatively, a certificate may be specified by setting [SignerCert](#signercert-property-dsa-class)

**DSA Key Notes**

A DSA key is made up of a number of individual parameters. When calling [CreateKey](#createkey-method-dsa-class) the [key](#key-property-dsa-class) property is populated with a new private and public key.

After calling [Sign](#sign-method-dsa-class) the public key must be sent to the recipient along with [HashSignature](#hashsignature-property-dsa-class) so they may perform signature verification. Likewise you must obtain the public key along with [HashSignature](#hashsignature-property-dsa-class) in order to perform signature verification.

The public key consists of the following parameters:

- [P](#DSAKey_f_P)
- [Q](#DSAKey_f_Q)
- [G](#DSAKey_f_G)
- [Y](#DSAKey_f_Y)

The class also includes the [PublicKey](#DSAKey_f_PublicKey) field which holds the PEM formatted public key for ease of use. This is helpful if you are in control of both signature creation and verification process. When sending the public key to a recipient note that not all implementations will support using the PEM formatted value in [PublicKey](#DSAKey_f_PublicKey) in which case the individual parameters must be sent.

The private key consists of the following parameters:

- [P](#DSAKey_f_P)
- [Q](#DSAKey_f_Q)
- [G](#DSAKey_f_G)
- [Y](#DSAKey_f_Y)
- [X](#DSAKey_f_X)

 The class also include the [PrivateKey](#DSAKey_f_PrivateKey) field which holds the PEM formatted private key for ease of use. This is helpful for storing the private key more easily.

 Please refer to the [DSAKey](#dsakey-type) type for a complete list of fields.

# UseHex Property ([DSA](#dsa-class) Class)

Whether HashValue and HashSignature are hex encoded.

## Syntax

```text
public boolean isUseHex();
public void setUseHex(boolean useHex);
```

## Default Value

False

## Remarks

This property specifies whether [HashValue](#hashvalue-property-dsa-class) and [HashSignature](#hashsignature-property-dsa-class) are hex encoded.

If set to True, when [Sign](#sign-method-dsa-class) is called the class will compute the hash for the specified file and populate [HashValue](#hashvalue-property-dsa-class) with the hex encoded hash value. It will then create the hash signature and populate [HashSignature](#hashsignature-property-dsa-class) with the hex encoded hash signature value. If [HashValue](#hashvalue-property-dsa-class) is specified directly, it must be a hex encoded value.

If set to True, when [VerifySignature](#verifysignature-method-dsa-class) is called the class will compute the hash value for the specified file and populate [HashValue](#hashvalue-property-dsa-class) with the hex encoded hash value. It will then hex decode [HashSignature](#hashsignature-property-dsa-class) and verify the signature. [HashSignature](#hashsignature-property-dsa-class) must hold a hex encoded value. If [HashValue](#hashvalue-property-dsa-class) is specified directly, it must be a hex encoded value.

# Config Method ([DSA](#dsa-class) Class)

Sets or retrieves a configuration setting.

## Syntax

```text
public String config(String configurationString);
```

## Remarks

Config is a generic method available in every class. It is used to set and retrieve [configuration settings](#config-settings-dsa-class) for the class.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these *internal properties* is provided through the Config method.

To set a configuration setting named *PROPERTY*, you must call *Config("PROPERTY=VALUE")*, where *VALUE* is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a [configuration setting](#config-settings-dsa-class), you must call *Config("PROPERTY")*. The value will be returned as a string.

# CreateKey Method ([DSA](#dsa-class) Class)

Creates a new key.

## Syntax

```text
public void createKey();
```

## Remarks

This method creates a new public and private key.

**DSA Key Notes**

A DSA key is made up of a number of individual parameters. When calling CreateKey the [key](#key-property-dsa-class) property is populated with a new private and public key.

After calling [Sign](#sign-method-dsa-class) the public key must be sent to the recipient along with [HashSignature](#hashsignature-property-dsa-class) so they may perform signature verification. Likewise you must obtain the public key along with [HashSignature](#hashsignature-property-dsa-class) in order to perform signature verification.

The public key consists of the following parameters:

- [P](#DSAKey_f_P)
- [Q](#DSAKey_f_Q)
- [G](#DSAKey_f_G)
- [Y](#DSAKey_f_Y)

The class also includes the [PublicKey](#DSAKey_f_PublicKey) field which holds the PEM formatted public key for ease of use. This is helpful if you are in control of both signature creation and verification process. When sending the public key to a recipient note that not all implementations will support using the PEM formatted value in [PublicKey](#DSAKey_f_PublicKey) in which case the individual parameters must be sent.

The private key consists of the following parameters:

- [P](#DSAKey_f_P)
- [Q](#DSAKey_f_Q)
- [G](#DSAKey_f_G)
- [Y](#DSAKey_f_Y)
- [X](#DSAKey_f_X)

 The class also include the [PrivateKey](#DSAKey_f_PrivateKey) field which holds the PEM formatted private key for ease of use. This is helpful for storing the private key more easily.

# Reset Method ([DSA](#dsa-class) Class)

Resets the class.

## Syntax

```text
public void reset();
```

## Remarks

When called, the class will reset all of its properties to their default values.

# SetInputStream Method ([DSA](#dsa-class) Class)

Sets the stream from which the class will read data to encrypt or decrypt.

## Syntax

```text
public void setInputStream(java.io.InputStream inputStream);
```

## Remarks

This method sets the stream from which the class will read data to encrypt or decrypt.

**Input and Output Properties**

The class will determine the source and destination of the input and output based on which properties are set.

The order in which the input properties are checked is as follows:

- SetInputStream
- [InputFile](#inputfile-property-dsa-class)
- [InputMessage](#inputmessage-property-dsa-class)

When a valid source is found, the search stops. The order in which the output properties are checked is as follows:

- SetOutputStream
- OutputFile
- OutputMessage: The output data is written to this property if no other destination is specified.

When using streams, you may need to additionally set [CloseInputStreamAfterProcessing](#CloseInputStreamAfterProcessing) or [CloseOutputStreamAfterProcessing](#CloseOutputStreamAfterProcessing).

# Sign Method ([DSA](#dsa-class) Class)

Creates a hash signature.

## Syntax

```text
public void sign();
```

## Remarks

This method will create a hash signature.

Before calling this method specify the input file by setting [SetInputStream](#setinputstream-method-dsa-class), [InputFile](#inputfile-property-dsa-class), or [InputMessage](#inputmessage-property-dsa-class).

A key is required to create the hash signature. You may create a new key by calling [CreateKey](#createkey-method-dsa-class), or specify an existing key pair in [Key](#key-property-dsa-class). Alternatively, a certificate may be specified by setting [Certificate](#certificate-property-dsa-class). When this method is called the class will compute the hash for the specified file and populate [HashValue](#hashvalue-property-dsa-class). It will then create the hash signature using the specified [Key](#key-property-dsa-class) and populate [HashSignature](#hashsignature-property-dsa-class).

To create the hash signature without first computing the hash simply specify [HashValue](#hashvalue-property-dsa-class) before calling this method.

The [Progress](#progress-event-dsa-class) event will fire with updates for the hash computation progress only. The hash signature creation process is quick and does not require progress updates.

# VerifySignature Method ([DSA](#dsa-class) Class)

Verifies the signature for the specified data.

## Syntax

```text
public boolean verifySignature();
```

## Remarks

This method will verify a hash signature.

Before calling this method specify the input file by setting [SetInputStream](#setinputstream-method-dsa-class), [InputFile](#inputfile-property-dsa-class), or [InputMessage](#inputmessage-property-dsa-class).

A public key and the hash signature are required to perform the signature verification. Specify the public key in [SignerKey](#signerkey-property-dsa-class). Alternatively, a certificate may be specified by setting [SignerCert](#signercert-property-dsa-class). Specify the hash signature in [HashSignature](#hashsignature-property-dsa-class).

When this method is called the class will compute the hash for the specified file and populate [HashValue](#hashvalue-property-dsa-class). It will verify the signature using the specified [SignerKey](#signerkey-property-dsa-class) and [HashSignature](#hashsignature-property-dsa-class).

To verify the hash signature without first computing the hash simply specify [HashValue](#hashvalue-property-dsa-class) before calling this method.

The [Progress](#progress-event-dsa-class) event will fire with updates for the hash computation progress only. The hash signature verification process is quick and does not require progress updates.

# Error Event ([DSA](#dsa-class) Class)

Fired when information is available about errors during data delivery.

## Syntax

```text
public class DefaultDSAEventListener implements DSAEventListener {
  ...
  public void error(DSAErrorEvent e) {}
  ...
}

public class DSAErrorEvent {
  public int errorCode;
  public String description;
}
```

## Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally the class throws an exception.

The *ErrorCode* parameter contains an error code, and the *Description* parameter contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the [Error Codes](#trappable-errors-dsa-class) section.

# Progress Event ([DSA](#dsa-class) Class)

Fired as progress is made.

## Syntax

```text
public class DefaultDSAEventListener implements DSAEventListener {
  ...
  public void progress(DSAProgressEvent e) {}
  ...
}

public class DSAProgressEvent {
  public long bytesProcessed;
  public int percentProcessed;
}
```

## Remarks

This event is fired automatically as data is processed by the class.

The *PercentProcessed* parameter indicates the current status of the operation.

The *BytesProcessed* parameter holds the total number of bytes processed so far.

# Certificate Type

This is the digital certificate being used.

## Remarks

This type describes the current digital certificate. The certificate may be a public or private key. The fields are used to identify or select certificates.

The following fields are available:

- [EffectiveDate](#Certificate_f_EffectiveDate)

- [ExpirationDate](#Certificate_f_ExpirationDate)

- [ExtendedKeyUsage](#Certificate_f_ExtendedKeyUsage)

- [Fingerprint](#Certificate_f_Fingerprint)

- [FingerprintSHA1](#Certificate_f_FingerprintSHA1)

- [FingerprintSHA256](#Certificate_f_FingerprintSHA256)

- [Issuer](#Certificate_f_Issuer)

- [KeyPassword](#Certificate_f_KeyPassword)

- [PrivateKey](#Certificate_f_PrivateKey)

- [PrivateKeyAvailable](#Certificate_f_PrivateKeyAvailable)

- [PrivateKeyContainer](#Certificate_f_PrivateKeyContainer)

- [PublicKey](#Certificate_f_PublicKey)

- [PublicKeyAlgorithm](#Certificate_f_PublicKeyAlgorithm)

- [PublicKeyLength](#Certificate_f_PublicKeyLength)

- [SerialNumber](#Certificate_f_SerialNumber)

- [SignatureAlgorithm](#Certificate_f_SignatureAlgorithm)

- [Store](#Certificate_f_Store)

- [StorePassword](#Certificate_f_StorePassword)

- [StoreType](#Certificate_f_StoreType)

- [SubjectAltNames](#Certificate_f_SubjectAltNames)

- [ThumbprintMD5](#Certificate_f_ThumbprintMD5)

- [ThumbprintSHA1](#Certificate_f_ThumbprintSHA1)

- [ThumbprintSHA256](#Certificate_f_ThumbprintSHA256)

- [Usage](#Certificate_f_Usage)

- [UsageFlags](#Certificate_f_UsageFlags)

- [Version](#Certificate_f_Version)

- [Subject](#Certificate_f_Subject)

- [Encoded](#Certificate_f_Encoded)

## Fields

 **EffectiveDate** *String (read-only)*
*Default Value: ""*

The date on which this certificate becomes valid. Before this date, it is not valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date:

23-Jan-2000 15:00:00.

 **ExpirationDate** *String (read-only)*
*Default Value: ""*

The date on which the certificate expires. After this date, the certificate will no longer be valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date:

23-Jan-2001 15:00:00.

 **ExtendedKeyUsage** *String (read-only)*
*Default Value: ""*

A comma-delimited list of extended key usage identifiers. These are the same as ASN.1 object identifiers (OIDs).

 **Fingerprint** *String (read-only)*
*Default Value: ""*

The hex-encoded, 16-byte MD5 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: *bc:2a:72:af:fe:58:17:43:7a:5f:ba:5a:7c:90:f7:02*

 **FingerprintSHA1** *String (read-only)*
*Default Value: ""*

The hex-encoded, 20-byte SHA-1 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: *30:7b:fa:38:65:83:ff:da:b4:4e:07:3f:17:b8:a4:ed:80:be:ff:84*

 **FingerprintSHA256** *String (read-only)*
*Default Value: ""*

The hex-encoded, 32-byte SHA-256 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: *6a:80:5c:33:a9:43:ea:b0:96:12:8a:64:96:30:ef:4a:8a:96:86:ce:f4:c7:be:10:24:8e:2b:60:9e:f3:59:53*

 **Issuer** *String (read-only)*
*Default Value: ""*

The issuer of the certificate. This field contains a string representation of the name of the issuing authority for the certificate.

 **KeyPassword** *String*
*Default Value: ""*

The password for the certificate's private key (if any).

Some certificate stores may individually protect certificates' private keys, separate from the standard protection offered by the [StorePassword](#Certificate_f_StorePassword). This field can be used to read such password-protected private keys.

NOTE: This property defaults to the value of [StorePassword](#Certificate_f_StorePassword). To clear it, you must set the property to the empty string (""). It can be set at any time, but when the private key's password is different from the store's password, then it must be set before calling [PrivateKey](#Certificate_f_PrivateKey).

 **PrivateKey** *String (read-only)*
*Default Value: ""*

The private key of the certificate (if available). The key is provided as PEM/Base64-encoded data.

NOTE: The [PrivateKey](#Certificate_f_PrivateKey) may be available but not exportable. In this case, [PrivateKey](#Certificate_f_PrivateKey) returns an empty string.

 **PrivateKeyAvailable** *boolean (read-only)*
*Default Value: False*

Whether a [PrivateKey](#Certificate_f_PrivateKey) is available for the selected certificate. If [PrivateKeyAvailable](#Certificate_f_PrivateKeyAvailable) is True, the certificate may be used for authentication purposes (e.g., server authentication).

 **PrivateKeyContainer** *String (read-only)*
*Default Value: ""*

The name of the [PrivateKey](#Certificate_f_PrivateKey) container for the certificate (if available). This functionality is available only on Windows platforms.

 **PublicKey** *String (read-only)*
*Default Value: ""*

The public key of the certificate. The key is provided as PEM/Base64-encoded data.

 **PublicKeyAlgorithm** *String (read-only)*
*Default Value: ""*

The textual description of the certificate's public key algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_DH") or an object identifier (OID) string representing the algorithm.

 **PublicKeyLength** *int (read-only)*
*Default Value: 0*

The length of the certificate's public key (in bits). Common values are 512, 1024, and 2048.

 **SerialNumber** *String (read-only)*
*Default Value: ""*

The serial number of the certificate encoded as a string. The number is encoded as a series of hexadecimal digits, with each pair representing a byte of the serial number.

 **SignatureAlgorithm** *String (read-only)*
*Default Value: ""*

The text description of the certificate's signature algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSA_MD5RSA") or an object identifier (OID) string representing the algorithm.

 **Store** *String*
*Default Value: "MY"*

The name of the certificate store for the client certificate.

The [StoreType](#Certificate_f_StoreType) field denotes the type of the certificate store specified by [Store](#Certificate_f_Store). If the store is password-protected, specify the password in [StorePassword](#Certificate_f_StorePassword).

[Store](#Certificate_f_Store) is used in conjunction with the [Subject](#Certificate_f_Subject) field to specify client certificates. If [Store](#Certificate_f_Store) has a value, and [Subject](#Certificate_f_Subject) or [Encoded](#Certificate_f_Encoded) is set, a search for a certificate is initiated. Please see the [Subject](#Certificate_f_Subject) field for details.

 Designations of certificate stores are platform dependent.

The following designations are the most common User and Machine certificate stores in Windows:

|  |  |
| --- | --- |
| MY | A certificate store holding personal certificates with their associated private keys. |
| CA | Certifying authority certificates. |
| ROOT | Root certificates. |

In Java, the certificate store normally is a file containing certificates and optional private keys.

When the certificate store type is *cstPFXFile*, this property must be set to the name of the file. When the type is *cstPFXBlob*, the property must be set to the binary contents of a PFX file (i.e., PKCS#12 certificate store).

 **StoreB** *byte[]*
*Default Value: "MY"*

The name of the certificate store for the client certificate.

The [StoreType](#Certificate_f_StoreType) field denotes the type of the certificate store specified by [Store](#Certificate_f_Store). If the store is password-protected, specify the password in [StorePassword](#Certificate_f_StorePassword).

[Store](#Certificate_f_Store) is used in conjunction with the [Subject](#Certificate_f_Subject) field to specify client certificates. If [Store](#Certificate_f_Store) has a value, and [Subject](#Certificate_f_Subject) or [Encoded](#Certificate_f_Encoded) is set, a search for a certificate is initiated. Please see the [Subject](#Certificate_f_Subject) field for details.

 Designations of certificate stores are platform dependent.

The following designations are the most common User and Machine certificate stores in Windows:

|  |  |
| --- | --- |
| MY | A certificate store holding personal certificates with their associated private keys. |
| CA | Certifying authority certificates. |
| ROOT | Root certificates. |

In Java, the certificate store normally is a file containing certificates and optional private keys.

When the certificate store type is *cstPFXFile*, this property must be set to the name of the file. When the type is *cstPFXBlob*, the property must be set to the binary contents of a PFX file (i.e., PKCS#12 certificate store).

 **StorePassword** *String*
*Default Value: ""*

If the type of certificate store requires a password, this field is used to specify the password needed to open the certificate store.

 **StoreType** *int*
*Default Value: 0*

The type of certificate store for this certificate.

 The class supports both public and private keys in a variety of formats. When the *cstAuto* value is used, the class will automatically determine the type. This field can take one of the following values:

```csharp
sftp.SSHCert = new Certificate(CertStoreTypes.cstPKCS11,
                               @"C:\Program Files\OpenSC Project\OpenSC\pkcs11\opensc-pkcs11.dll",
                               "123456", // PIN
                               "CN=cert_subject");
sftp.SSHUser = "test";
sftp.SSHLogon("myhost", 22);
```

```csharp
certmgr.CertStoreType = CertStoreTypes.cstPKCS11;
certmgr.OnCertList += (s, e) => {
  secKeyBlob = e.CertEncoded;
};
certmgr.CertStore = @"C:\Program Files\OpenSC Project\OpenSC\pkcs11\opensc-pkcs11.dll";
certmgr.CertStorePassword = "123456"; // PIN
certmgr.ListStoreCertificates();

sftp.SSHCert = new Certificate(CertStoreTypes.cstPKCS11, secKeyBlob, "123456", "*");
sftp.SSHUser = "test";
sftp.SSHLogon("myhost", 22);
```

|  |  |
| --- | --- |
| 0 (cstUser - default) | For Windows, this specifies that the certificate store is a certificate store owned by the current user. NOTE: This store type is not available in Java. |
| 1 (cstMachine) | For Windows, this specifies that the certificate store is a machine store. NOTE: This store type is not available in Java. |
| 2 (cstPFXFile) | The certificate store is the name of a PFX (PKCS#12) file containing certificates. |
| 3 (cstPFXBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in PFX (PKCS#12) format. |
| 4 (cstJKSFile) | The certificate store is the name of a Java Key Store (JKS) file containing certificates. NOTE: This store type is only available in Java. |
| 5 (cstJKSBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in Java Key Store (JKS) format. NOTE: This store type is only available in Java. |
| 6 (cstPEMKeyFile) | The certificate store is the name of a PEM-encoded file that contains a private key and an optional certificate. |
| 7 (cstPEMKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains a private key and an optional certificate. |
| 8 (cstPublicKeyFile) | The certificate store is the name of a file that contains a PEM- or DER-encoded public key certificate. |
| 9 (cstPublicKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains a PEM- or DER-encoded public key certificate. |
| 10 (cstSSHPublicKeyBlob) | The certificate store is a string (binary or Base64-encoded) that contains an SSH-style public key. |
| 11 (cstP7BFile) | The certificate store is the name of a PKCS#7 file containing certificates. |
| 12 (cstP7BBlob) | The certificate store is a string (binary) representing a certificate store in PKCS#7 format. |
| 13 (cstSSHPublicKeyFile) | The certificate store is the name of a file that contains an SSH-style public key. |
| 14 (cstPPKFile) | The certificate store is the name of a file that contains a PPK (PuTTY Private Key). |
| 15 (cstPPKBlob) | The certificate store is a string (binary) that contains a PPK (PuTTY Private Key). |
| 16 (cstXMLFile) | The certificate store is the name of a file that contains a certificate in XML format. |
| 17 (cstXMLBlob) | The certificate store is a string that contains a certificate in XML format. |
| 18 (cstJWKFile) | The certificate store is the name of a file that contains a JWK (JSON Web Key). |
| 19 (cstJWKBlob) | The certificate store is a string that contains a JWK (JSON Web Key). |
| 21 (cstBCFKSFile) | The certificate store is the name of a file that contains a BCFKS (Bouncy Castle FIPS Key Store). NOTE: This store type is only available in Java and .NET. |
| 22 (cstBCFKSBlob) | The certificate store is a string (binary or Base64-encoded) representing a certificate store in BCFKS (Bouncy Castle FIPS Key Store) format. NOTE: This store type is only available in Java and .NET. |
| 23 (cstPKCS11) | The certificate is present on a physical security key accessible via a PKCS#11 interface. To use a security key, create a new [Certificate](#certificate-type) object and pass cstPKCS11 as the [StoreType](#Certificate_f_StoreType), the full path of the PKCS#11 DLL as the [Store](#Certificate_f_Store), and the PIN as the [StorePassword](#Certificate_f_StorePassword). Code Example. SSH Authentication with Security Key (without CertMgr): Alternatively, collect the necessary data using the [CertMgr](CertMgr.md#CertMgr) class by calling the [ListStoreCertificates](CertMgr.md#CertMgr_m_ListStoreCertificates) method after setting the corresponding properties accordingly. The certificate information returned in the [CertList](CertMgr.md#CertMgr_e_CertList) event's CertEncoded parameter may be saved for later use. When using a certificate obtained with this approach, pass the previously saved security key information as the [Store](#Certificate_f_Store) and set [StorePassword](#Certificate_f_StorePassword) to the PIN. Code Example. SSH Authentication with Security Key (with CertMgr): |
| 99 (cstAuto) | The store type is automatically detected from the input data. This setting may be used with both public and private keys and can detect any of the supported formats automatically. |

 **SubjectAltNames** *String (read-only)*
*Default Value: ""*

Comma-separated lists of alternative subject names for the certificate.

 **ThumbprintMD5** *String (read-only)*
*Default Value: ""*

The MD5 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

 **ThumbprintSHA1** *String (read-only)*
*Default Value: ""*

The SHA-1 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

 **ThumbprintSHA256** *String (read-only)*
*Default Value: ""*

The SHA-256 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

 **Usage** *String (read-only)*
*Default Value: ""*

The text description of [UsageFlags](#Certificate_f_UsageFlags).

This value will be one or more of the following strings and will be separated by commas:

- Digital Signature
- Non-Repudiation
- Key Encipherment
- Data Encipherment
- Key Agreement
- Certificate Signing
- CRL Signing
- Encipher Only

If the provider is OpenSSL, the value is a comma-separated list of X.509 certificate extension names.

 **UsageFlags** *int (read-only)*
*Default Value: 0*

The flags that show intended use for the certificate. The value of [UsageFlags](#Certificate_f_UsageFlags) is a combination of the following flags:

|  |  |
| --- | --- |
| 0x80 | Digital Signature |
| 0x40 | Non-Repudiation |
| 0x20 | Key Encipherment |
| 0x10 | Data Encipherment |
| 0x08 | Key Agreement |
| 0x04 | Certificate Signing |
| 0x02 | CRL Signing |
| 0x01 | Encipher Only |

Please see the [Usage](#Certificate_f_Usage) field for a text representation of [UsageFlags](#Certificate_f_UsageFlags).

This functionality currently is not available when the provider is OpenSSL.

 **Version** *String (read-only)*
*Default Value: ""*

The certificate's version number. The possible values are the strings "V1", "V2", and "V3".

 **Subject** *String*
*Default Value: ""*

The subject of the certificate used for client authentication.

This field will be populated with the full subject of the loaded certificate. When loading a certificate, the subject is used to locate the certificate in the store.

If an exact match is not found, the store is searched for subjects containing the value of the property.

If a match is still not found, the property is set to an empty string, and no certificate is selected.

The special value "*" picks a random certificate in the certificate store.

The certificate subject is a comma-separated list of distinguished name fields and values. For instance, "CN=www.server.com, OU=test, C=US, E=example@email.com". Common fields and their meanings are as follows:

| Field | Meaning |
| --- | --- |
| CN | Common Name. This is commonly a hostname like www.server.com. |
| O | Organization |
| OU | Organizational Unit |
| L | Locality |
| S | State |
| C | Country |
| E | Email Address |

If a field value contains a comma, it must be quoted.

 **Encoded** *String*
*Default Value: ""*

The certificate (PEM/Base64 encoded). This field is used to assign a specific certificate. The [Store](#Certificate_f_Store) and [Subject](#Certificate_f_Subject) fields also may be used to specify a certificate.

When [Encoded](#Certificate_f_Encoded) is set, a search is initiated in the current [Store](#Certificate_f_Store) for the private key of the certificate. If the key is found, [Subject](#Certificate_f_Subject) is updated to reflect the full subject of the selected certificate; otherwise, [Subject](#Certificate_f_Subject) is set to an empty string.

 **EncodedB** *byte[]*
*Default Value: ""*

The certificate (PEM/Base64 encoded). This field is used to assign a specific certificate. The [Store](#Certificate_f_Store) and [Subject](#Certificate_f_Subject) fields also may be used to specify a certificate.

When [Encoded](#Certificate_f_Encoded) is set, a search is initiated in the current [Store](#Certificate_f_Store) for the private key of the certificate. If the key is found, [Subject](#Certificate_f_Subject) is updated to reflect the full subject of the selected certificate; otherwise, [Subject](#Certificate_f_Subject) is set to an empty string.

## Constructors

```text
public Certificate();
```

 Creates a instance whose properties can be set.

```text
public Certificate(String certificateFile);
```

 Opens * CertificateFile * and reads out the contents as an X.509 public key.

```text
public Certificate(byte[] encoded);
```

 Parses * Encoded * as an X.509 public key.

```text
public Certificate(int storeType, String store, String storePassword, String subject);
```

 * StoreType * identifies the type of certificate store to use. See for descriptions of the different certificate stores. * Store * is a file containing the certificate store. * StorePassword * is the password used to protect the store.

 After the store has been successfully opened, the class will attempt to find the certificate identified by * Subject * . This can be either a complete or a substring match of the X.509 certificate's subject Distinguished Name (DN). The * Subject * parameter can also take an MD5, SHA-1, or SHA-256 thumbprint of the certificate to load in a "Thumbprint=value" format.

```text
public Certificate(int storeType, String store, String storePassword, String subject, String configurationString);
```

 * StoreType * identifies the type of certificate store to use. See for descriptions of the different certificate stores. * Store * is a file containing the certificate store. * StorePassword * is the password used to protect the store.

 * ConfigurationString * is a newline-separated list of name-value pairs that may be used to modify the default behavior. Possible values include "PersistPFXKey", which shows whether or not the PFX key is persisted after performing operations with the private key. This correlates to the PKCS12_NO_PERSIST_KEY CryptoAPI option. The default value is True (the key is persisted). "Thumbprint" - an MD5, SHA-1, or SHA-256 thumbprint of the certificate to load. When specified, this value is used to select the certificate in the store. This is applicable to the * cstUser * , * cstMachine * , * cstPublicKeyFile * , and * cstPFXFile * store types. "UseInternalSecurityAPI" shows whether the platform (default) or the internal security API is used when performing certificate-related operations.

 After the store has been successfully opened, the class will attempt to find the certificate identified by * Subject * . This can be either a complete or a substring match of the X.509 certificate's subject Distinguished Name (DN). The * Subject * parameter can also take an MD5, SHA-1, or SHA-256 thumbprint of the certificate to load in a "Thumbprint=value" format.

```text
public Certificate(int storeType, String store, String storePassword, byte[] encoded);
```

 * StoreType * identifies the type of certificate store to use. See for descriptions of the different certificate stores. * Store * is a file containing the certificate store. * StorePassword * is the password used to protect the store.

 After the store has been successfully opened, the class will load * Encoded * as an X.509 certificate and search the opened store for a corresponding private key.

```text
public Certificate(int storeType, byte[] store, String storePassword, String subject);
```

 * StoreType * identifies the type of certificate store to use. See for descriptions of the different certificate stores. * Store * is a byte array containing the certificate data. * StorePassword * is the password used to protect the store.

 After the store has been successfully opened, the class will attempt to find the certificate identified by * Subject * . This can be either a complete or a substring match of the X.509 certificate's subject Distinguished Name (DN). The * Subject * parameter can also take an MD5, SHA-1, or SHA-256 thumbprint of the certificate to load in a "Thumbprint=value" format.

```text
public Certificate(int storeType, byte[] store, String storePassword, String subject, String configurationString);
```

 * StoreType * identifies the type of certificate store to use. See for descriptions of the different certificate stores. * Store * is a byte array containing the certificate data. * StorePassword * is the password used to protect the store.

 After the store has been successfully opened, the class will attempt to find the certificate identified by * Subject * . This can be either a complete or a substring match of the X.509 certificate's subject Distinguished Name (DN). The * Subject * parameter can also take an MD5, SHA-1, or SHA-256 thumbprint of the certificate to load in a "Thumbprint=value" format.

```text
public Certificate(int storeType, byte[] store, String storePassword, byte[] encoded);
```

 * StoreType * identifies the type of certificate store to use. See for descriptions of the different certificate stores. * Store * is a byte array containing the certificate data. * StorePassword * is the password used to protect the store.

 After the store has been successfully opened, the class will load * Encoded * as an X.509 certificate and search the opened store for a corresponding private key.

# DSAKey Type

Contains the parameters for the DSA algorithm.

## Remarks

This type is made up of fields that represent the private and public key parameters used by the DSA algorithm.

**DSA Key Notes**

A DSA key is made up of a number of individual parameters. When calling [CreateKey](#createkey-method-dsa-class) the [key](#key-property-dsa-class) property is populated with a new private and public key.

After calling [Sign](#sign-method-dsa-class) the public key must be sent to the recipient along with [HashSignature](#hashsignature-property-dsa-class) so they may perform signature verification. Likewise you must obtain the public key along with [HashSignature](#hashsignature-property-dsa-class) in order to perform signature verification.

The public key consists of the following parameters:

- [P](#DSAKey_f_P)
- [Q](#DSAKey_f_Q)
- [G](#DSAKey_f_G)
- [Y](#DSAKey_f_Y)

The class also includes the [PublicKey](#DSAKey_f_PublicKey) field which holds the PEM formatted public key for ease of use. This is helpful if you are in control of both signature creation and verification process. When sending the public key to a recipient note that not all implementations will support using the PEM formatted value in [PublicKey](#DSAKey_f_PublicKey) in which case the individual parameters must be sent.

The private key consists of the following parameters:

- [P](#DSAKey_f_P)
- [Q](#DSAKey_f_Q)
- [G](#DSAKey_f_G)
- [Y](#DSAKey_f_Y)
- [X](#DSAKey_f_X)

 The class also include the [PrivateKey](#DSAKey_f_PrivateKey) field which holds the PEM formatted private key for ease of use. This is helpful for storing the private key more easily.

The following fields are available:

- [G](#DSAKey_f_G)

- [P](#DSAKey_f_P)

- [PrivateKey](#DSAKey_f_PrivateKey)

- [PublicKey](#DSAKey_f_PublicKey)

- [Q](#DSAKey_f_Q)

- [X](#DSAKey_f_X)

- [Y](#DSAKey_f_Y)

## Fields

 **G** *String*
*Default Value: ""*

Represents the G parameter for the DSA algorithm.

 **GB** *byte[]*
*Default Value: ""*

Represents the G parameter for the DSA algorithm.

 **P** *String*
*Default Value: ""*

Represents the P parameter for the DSA algorithm.

 **PB** *byte[]*
*Default Value: ""*

Represents the P parameter for the DSA algorithm.

 **PrivateKey** *String*
*Default Value: ""*

This field is a PEM formatted private key. The purpose of this field is to allow easier management of the private key parameters by using only a single value.

 **PublicKey** *String*
*Default Value: ""*

This field is a PEM formatted public key. The purpose of this field is to allow easier management of the public key parameters by using only a single value.

 **Q** *String*
*Default Value: ""*

Represents the Q parameter for the DSA algorithm.

 **QB** *byte[]*
*Default Value: ""*

Represents the Q parameter for the DSA algorithm.

 **X** *String*
*Default Value: ""*

Represents the X parameter for the DSA algorithm.

 **XB** *byte[]*
*Default Value: ""*

Represents the X parameter for the DSA algorithm.

 **Y** *String*
*Default Value: ""*

Represents the Y parameter for the DSA algorithm.

 **YB** *byte[]*
*Default Value: ""*

Represents the Y parameter for the DSA algorithm.

## Constructors

```text
public DSAKey();
```

 The default constructor creates a new DSAKey instance but does not assign a public or private key.

```text
public DSAKey(byte[] P, byte[] Q, byte[] G, byte[] Y);
```

 The public key constructor assigns an existing public key.

```text
public DSAKey(byte[] P, byte[] Q, byte[] G, byte[] Y, byte[] X);
```

 The private key constructor assigns an existing private key.

# Config Settings ([DSA](#dsa-class) Class)

 The class accepts one or more of the following *configuration settings*. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these *internal properties* is provided through the [Config](#config-method-dsa-class) method.

### DSA Config Settings

**CloseInputStreamAfterProcessing**: Determines whether or not the input stream is closed after processing.Determines whether or not the input stream set by [SetInputStream](#setinputstream-method-dsa-class) is closed after processing is complete. The default value is True.

**HashSignatureFormat**: The format of the HashSignature.This setting specifies the format of [HashSignature](#hashsignature-property-dsa-class) when calling [Sign](#sign-method-dsa-class). The way the [HashSignature](#hashsignature-property-dsa-class) parameters are represented can be changed to be interoperable with other implementations. Possible values are:

|  |  |
| --- | --- |
| 0 (Concatenated - default) | Compatible with Windows/.NET |
| 1 (ASN) | Compatible with OpenSSL/Mac/iOS |

 The default value is 0 (Concatenated). This setting is only applicable when calling [Sign](#sign-method-dsa-class). When calling [VerifySignature](#verifysignature-method-dsa-class) the format is automatically determined by the class.

**KeyFormat**: How the public and private key are formatted.This setting controls the format of [PublicKey](#DSAKey_f_PublicKey) and [PrivateKey](#DSAKey_f_PrivateKey). By default these fields hold PEM formatted public and private key data. When set to 1 (XML) the keys are stored in a XML format. This only affects the values returned by the class; the actual keys remain the same regardless of this setting. Possible values are:

- 0 (PEM - PKCS#1)
- 1 (XML)
- 2 (PEM - PKCS#8 - default)

 The default value is 2 (PEM - PKCS#8).

**KeySize**: The size, in bits, of the secret key.This specifies the size, in bits, of the secret key. The minimum key size for DSA is 512. The maximum key size is 4096. Note that large values such as 4096 will impact performance. The default value is 1024.

### Base Config Settings

**BuildInfo**: Information about the product's build.When queried, this setting will return a string containing information about the product's build.

**GUIAvailable**: Whether or not a message loop is available for processing events.In a GUI-based application, long-running blocking operations may cause the application to stop responding to input until the operation returns. The class will attempt to discover whether or not the application has a message loop and, if one is discovered, it will process events in that message loop during any such blocking operation.

In some non-GUI applications, an invalid message loop may be discovered that will result in errant behavior. In these cases, setting [GUIAvailable](#GUIAvailable) to *false* will ensure that the class does not attempt to process external events.

**LicenseInfo**: Information about the current license.When queried, this setting will return a string containing information about the license this instance of a class is using. It will return the following information:

- Product: The product the license is for.
- Product Key: The key the license was generated from.
- License Source: Where the license was found (e.g., RuntimeLicense, License File).
- License Type: The type of license installed (e.g., Royalty Free, Single Server).
- Last Valid Build: The last valid build number for which the license will work.

**MaskSensitiveData**: Whether sensitive data is masked in log messages.In certain circumstances it may be beneficial to mask sensitive data, like passwords, in log messages. Set this to *true* to mask sensitive data. The default is *true*.

**UseDaemonThreads**: Whether threads created by the class are daemon threads.If set to True (default), when the class creates a thread, the thread's Daemon property will be explicitly set to True. When set to False, the class will not set the Daemon property on the created thread. The default value is True.

**UseFIPSCompliantAPI**: Tells the class whether or not to use FIPS certified APIs.When set to *true*, the class will utilize the underlying operating system's certified APIs. Java editions, regardless of OS, utilize Bouncy Castle Federal Information Processing Standards (FIPS), while all other Windows editions make use of Microsoft security libraries.

The Java edition requires installation of the FIPS-certified Bouncy Castle library regardless of the target operating system. This can be downloaded from [https://www.bouncycastle.org/fips-java/](https://www.bouncycastle.org/fips-java/). Only the "Provider" library is needed. The jar file should then be installed in a JRE search path.

The following classes must be imported in the application in which the component will be used:

```text
import java.security.Security;
import org.bouncycastle.jcajce.provider.BouncyCastleFipsProvider;
```

The Bouncy Castle provider must be added as a valid provider and must also be configured to operate in FIPS mode:

```text
System.setProperty("org.bouncycastle.fips.approved_only","true");
Security.addProvider(new BouncyCastleFipsProvider());
```

When [UseFIPSCompliantAPI](#UseFIPSCompliantAPI) is *true*, Secure Sockets Layer (SSL)-enabled classes can optionally be configured to use the Transport Layer Security (TLS) Bouncy Castle library. When SSLProvider is set to *sslpAutomatic* (default) or *sslpInternal*, an internal TLS implementation is used, but all cryptographic operations are offloaded to the Bouncy Castle FIPS provider to achieve FIPS-compliant operation. If SSLProvider is set to *sslpPlatform*, the Bouncy Castle JSSE will be used in place of the internal TLS implementation.

To enable the use of the Bouncy Castle JSSE take the following steps in addition to the steps above. Both the Bouncy Castle FIPS provider and the Bouncy Castle JSSE must be configured to use the Bouncy Castle TLS library in FIPS mode. Obtain the Bouncy Castle TLS library from [https://www.bouncycastle.org/fips-java/](https://www.bouncycastle.org/fips-java/). The jar file should then be installed in a JRE search path.

The following classes must be imported in the application in which the component will be used:

```text
import java.security.Security;
import org.bouncycastle.jcajce.provider.BouncyCastleFipsProvider;

//required to use BCJSSE when SSLProvider is set to sslpPlatform
import org.bouncycastle.jsse.provider.BouncyCastleJsseProvider;
```

The Bouncy Castle provider must be added as a valid provider and also must be configured to operate in FIPS mode:

```text
System.setProperty("org.bouncycastle.fips.approved_only","true");
Security.addProvider(new BouncyCastleFipsProvider());

//required to use BCJSSE when SSLProvider is set to sslpPlatform
Security.addProvider(new BouncyCastleJsseProvider("fips:BCFIPS"));

//optional - configure logging level of BCJSSE
Logger.getLogger("org.bouncycastle.jsse").setLevel(java.util.logging.Level.OFF);

//configure the class to use BCJSSE
component.setSSLProvider(1); //platform
component.config("UseFIPSCompliantAPI=true");
```

 NOTE: TLS 1.3 support requires the Bouncy Castle TLS library version 1.0.14 or later.

FIPS mode can be enabled by setting the *UseFIPSCompliantAPI* configuration setting to *true*. This is a static setting that applies to all instances of all classes of the toolkit within the process. It is recommended to enable or disable this setting once before the component has been used to establish a connection. Enabling FIPS while an instance of the component is active and connected may result in unexpected behavior.

For more details, please see the [FIPS 140-2 Compliance](https://www.nsoftware.com/kb/articles/fips.rst) article.

NOTE: Enabling FIPS compliance requires a special license; please contact [sales@nsoftware.com](mailto:sales@nsoftware.com) for details.

**UseInternalSecurityAPI**: Whether or not to use the system security libraries or an internal implementation. When set to *false*, the class will use the system security libraries by default to perform cryptographic functions where applicable.

Setting this configuration setting to *true* tells the class to use the internal implementation instead of using the system security libraries.

 This setting is set to *false* by default on all platforms.

**UseVirtualThreads**: Whether threads created by the class use virtual threads instead of platform threads.If set to *true*, when the class creates a thread, it will be created as a virtual thread instead of a platform thread. Virtual threads are lightweight threads managed by the JVM that are multiplexed onto a small pool of carrier threads, significantly reducing memory usage and platform thread count under high-concurrency workloads. Requires Java 24 or later. The default value is *false*.

# Trappable Errors ([DSA](#dsa-class) Class)

### DSA Errors

|  |  |
| --- | --- |
| 102 | No Key specified. |
| 104 | Cannot read or write file. |
| 105 | Key parameters incorrect. |
| 106 | Cannot create hash. |
| 113 | Input data or HashValue must be specified. |
| 121 | Invalid certificate. |
| 124 | HashSignature must be specified. |
| 304 | Cannot write file. |
| 305 | Cannot read file. |