CryptoKeyManager Class

Properties   Methods   Events   Config Settings   Errors  

The CryptoKeyManager class provides a simple way to load, generate and manage generic cryptographic keys.

Syntax

secureblackbox.CryptoKeyManager

Remarks

CryptoKeyManager allows you to load, save, generate, import, and export low-level cryptographic keys. Two examples of such keys are raw RSA keys stored in PKCS1 format or AES256 keys. CryptoKeyManager supports asymmetric, symmetric, and HMAC keys.

CryptoKeyManager is a typical companion for low-level cryptography classes, such as PublicKeyCrypto, SymmetricCrypto, and HashFunction. It can also be used to provide external key material to certificate objects, and to derive cryptographic keys from passwords.

Use ImportBytes or ImportFromFile method to load the key material from a buffer or file. Use ImportFromCert (and remember to assign the certificate object to the Certificate property before calling it) to import a key from an X.509 certificate. Once loaded, the key will be available in the Key property. // Loading an AES key and setting its IV CryptoKeyManager.ImportBytes(Key, kffDER, "AES256", "", "", ktSecret, ""); CryptoKeyManager.Key.IV = IV; // Loading an ECDSA private key from a file CryptoKeyManager.ImportFromFile("ec-secp256k1-priv-key.pem", kffAuto, "ECDSA", "NISTP256", "", ktSecret, ""); // Loading an ECDSA public key from a file CryptoKeyManager.ImportFromFile("ec-secp256k1-pub-key.pem", kffAuto, "ECDSA", "NISTP256", "", ktPublic, ""); // Importing a private key from a certificate object CertMgr.ImportFromFile("cert.pfx", "password"); CryptoKeyManager.Certificate = CertMgr.Certificate; CryptoKeyManager.ImportFromCert();

To generate a new key or keypair use Generate method. You can export the generated key using ExportBytes or ExportToFile method. You can attach the generated or loaded key to an external certificate object using the ExportToCert method. // Generating an EdDSA Curve25519 keypair CryptoKeyManager.Generate("EDDSA", "CURVE25519", "", 256); // Generating an ECDSA NIST P256 curve keypair CryptoKeyManager.Generate("ECDSA", "NISTP256", "", 256); // Generating an RSA 2048 bit keypair CryptoKeyManager.Generate("RSA", "", "", 2048); // Generating a symmetric AES256 key CryptoKeyManager.Generate("AES256", "", "", 256);

Use DeriveKey to derive a strong cryptographic key from a password using one of supported key derivation functions (KDFs): CryptoKeyManager.DerivationAlgorithm = "PKCS5"; CryptoKeyManager.HMACAlgorithm = "SHA256"; CryptoKeyManager.DeriveIterations = 10000; CryptoKeyManager.DeriveKey(256, "password", "hex:41424344"); Key = CryptoKeyManager.Key.Key;

CryptoKeyManager supports the majority of modern cryptographic algorithms:

• Asymmetric: RSA, ECDSA, EdDSA, ElGamal, DSS, Diffie-Hellman
• Symmetric: AES, Blowfish, Camellia, CAST5, ChaCha20, DES, 3DES-EDE, IDEA, RC2, RC4, Serpent, Twofish.
• KDFs: PKCS5, PBKDF2 (an alias to PKCS5), BCrypt, SCrypt, Argon2d, Argon2i, Argon2id.

See the "Supported Algorithms" section in the FAQ for the complete list.

Note: CryptoKeyManager can only work with one cryptographic key at a time. Use CryptoKeyStorage to access media containing more than one key.

Property List

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

Method List

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

Event List

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

Config Settings

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

Certificate Property (CryptoKeyManager Class)

A container for the certificate object.

Syntax

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

Remarks

Use this property to set or access the properties of the certificate object on which an import or export action is to be performed.

This property is not available at design time.

Please refer to the Certificate type for a complete list of fields.

DerivationAlgorithm Property (CryptoKeyManager Class)

Specifies the algorithm to use for key derivation.

Syntax

public String getDerivationAlgorithm();
public void setDerivationAlgorithm(String derivationAlgorithm);

Default Value

"PKCS5"

Remarks

Use this property to specify the key derivation algorithm to use.

Class supports the following algorithms: PKCS5, PBKDF2 (an alias to PKCS5), BCrypt, SCrypt, Argon2d, Argon2i, Argon2id.

DeriveIterations Property (CryptoKeyManager Class)

Specifies the number of iterations to use as part of key derivation routine.

Syntax

public int getDeriveIterations();
public void setDeriveIterations(int deriveIterations);

Default Value

2048

Remarks

Use this property to adjust the number of hash algorithm iterations to employ as part of key derivation function.

FIPSMode Property (CryptoKeyManager Class)

Reserved.

Syntax

public boolean isFIPSMode();
public void setFIPSMode(boolean FIPSMode);

Default Value

False

Remarks

This property is reserved for future use.

HMACAlgorithm Property (CryptoKeyManager Class)

Specifies the HMAC algorithm to use with the key derivation algorithm.

Syntax

public String getHMACAlgorithm();
public void setHMACAlgorithm(String HMACAlgorithm);

Default Value

"SHA1"

Remarks

Use this property to specify the HMAC algorithm to use with the chosen key derivation algorithm.

Class supports the following algorithms: SHA1, SHA224, SHA256, SHA384, SHA512, MD5, RIPEMD, HMAC.

Key Property (CryptoKeyManager Class)

The key object that the manager is currently working with.

Syntax

public CryptoKey getKey();
public void setKey(CryptoKey key);

Remarks

Use this property to pass a key to the manager (for example, for serialization), or to obtain a key from the manager (e.g., after generating or importing it).

This property is not available at design time.

Please refer to the CryptoKey type for a complete list of fields.

Config Method (CryptoKeyManager Class)

Sets or retrieves a configuration setting.

Syntax

public String config(String configurationString);

Remarks

Config is a generic method available in every class. It is used to set and retrieve configuration settings 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, you must call Config("PROPERTY"). The value will be returned as a string.

CreateNew Method (CryptoKeyManager Class)

Creates a template for a new keypair.

Syntax

public void createNew();

Remarks

This method pre-generates a template for a new key.

Adjust the properties of the Key object and call Generate to complete the generation.

DeriveKey Method (CryptoKeyManager Class)

Generates a strong cryptographic key from a password.

Syntax

public void deriveKey(int keyBits, String password, String salt);

Remarks

Use this method to generate a cryptographically strong key of a needed length from a password.

This method uses the key derivation function specified in DerivationAlgorithm, the HMAC algorithm provided in HMACAlgorithm, over DeriveIterations iterations, to generate a cryptographic key of the needed length from a password and salt.

Salt is expected to contain a human-readable text string. To provide a binary salt, use the hex prefix with base16-encoded salt value: hex:01AB8F20004F10FE. CryptoKeyManager.DerivationAlgorithm = "PKCS5"; CryptoKeyManager.HMACAlgorithm = "SHA256"; CryptoKeyManager.DeriveIterations = 10000; CryptoKeyManager.DeriveKey(256, "password", "hex:41424344"); Key = CryptoKeyManager.Key.Key;

DoAction Method (CryptoKeyManager Class)

Performs an additional action.

Syntax

public String doAction(String actionID, String actionParams);

Remarks

DoAction is a generic method available in every class. It is used to perform an additional action introduced after the product major release. The list of actions is not fixed, and may be flexibly extended over time.

The unique identifier (case insensitive) of the action is provided in the ActionID parameter.

ActionParams contains the value of a single parameter, or a list of multiple parameters for the action in the form of PARAM1=VALUE1;PARAM2=VALUE2;....

Common ActionIDs:

ExportBytes Method (CryptoKeyManager Class)

Exports the key to a byte array.

Syntax

public byte[] exportBytes(int format, int keyType, String password);

Remarks

Use this method to save the Key (both the public and secret parts) to a byte array.

ExportToCert Method (CryptoKeyManager Class)

Exports the key to a certificate.

Syntax

public void exportToCert();

Remarks

Use this method to save the Key (both the public and secret parts) to the certificate specified in Certificate.

ExportToFile Method (CryptoKeyManager Class)

Exports the key to a file.

Syntax

public void exportToFile(String fileName, int format, int keyType, String password);

Remarks

Use this method to save the Key (both the public and secret parts) to the file passed via the FileName parameter.

ExportToStream Method (CryptoKeyManager Class)

Exports the key to a stream.

Syntax

public void exportToStream(java.io.OutputStream stream, int format, int keyType, String password);

Remarks

Use this method to save the Key (both the public and secret parts) to a stream pointed by the Stream parameter.

Generate Method (CryptoKeyManager Class)

Generates a new crypto key.

Syntax

public void generate(String keyAlgorithm, String scheme, String schemeParams, int keyBits);

Remarks

Call this method to generate a new key or keypair with the desired KeyAlgorithm and KeyBits of length.

The generated key will be populated in the Key property. // Generating an EdDSA Curve25519 keypair CryptoKeyManager.Generate("EDDSA", "CURVE25519", "", 256); // Generating an ECDSA NIST P256 curve keypair CryptoKeyManager.Generate("ECDSA", "NISTP256", "", 256); // Generating an RSA 2048 bit keypair CryptoKeyManager.Generate("RSA", "", "", 2048); // Generating a symmetric AES256 key CryptoKeyManager.Generate("AES256", "", "", 256);

GetKeyParam Method (CryptoKeyManager Class)

Returns a binary algorithm-specific key parameter.

Syntax

public byte[] getKeyParam(String name);

Remarks

Use this method to retrieve a binary algorithm-specific key parameter.

The following parameters are currently supported:

GetKeyParamStr Method (CryptoKeyManager Class)

Returns a string algorithm-specific key parameter.

Syntax

public String getKeyParamStr(String name);

Remarks

Use this method to get an human-readable algorithm-specific key parameter.

The following parameters are currently supported:

ImportBytes Method (CryptoKeyManager Class)

Loads a key from a byte array.

Syntax

public void importBytes(byte[] value, int format, String keyAlgorithm, String scheme, String schemeParams, int keyType, String password);

Remarks

Use this method to load a key, either public or secret, from a byte array.

Cryptokeymanager mgr = new Cryptokeymanager(); mgr.ImportBytes(ThirtyTwoKeyBytes, Constants.kffDER, "AES256", "", "", Constants.ktSecret)

ImportFromCert Method (CryptoKeyManager Class)

Loads a key from a certificate.

Syntax

public void importFromCert();

Remarks

Use this method to load a key, either public or secret, from a certificate.

ImportFromFile Method (CryptoKeyManager Class)

Loads a key from a file.

Syntax

public void importFromFile(String fileName, int format, String keyAlgorithm, String scheme, String schemeParams, int keyType, String password);

Remarks

Use this method to load a key, either public or secret, from a file.

ImportFromStream Method (CryptoKeyManager Class)

Loads a key from a stream.

Syntax

public void importFromStream(java.io.InputStream stream, int format, String keyAlgorithm, String scheme, String schemeParams, int keyType, String password);

Remarks

Use this method to load a key, either public or secret, from a stream.

Reset Method (CryptoKeyManager Class)

Resets the class settings.

Syntax

public void reset();

Remarks

Reset is a generic method available in every class.

SetKeyParam Method (CryptoKeyManager Class)

Sets an algorithm-specific key parameter.

Syntax

public void setKeyParam(String name, byte[] value);

Remarks

Use this method to set an algorithm-specific key parameter.

The following parameters are currently supported:

SetKeyParamStr Method (CryptoKeyManager Class)

Sets a string-based algorithm-specific key parameter.

Syntax

public void setKeyParamStr(String name, String valueStr);

Remarks

Use this method to set a string-based algorithm-specific key parameter.

Error Event (CryptoKeyManager Class)

Informs about an error during an operation.

Syntax

public class DefaultCryptoKeyManagerEventListener implements CryptoKeyManagerEventListener {
  ...
  public void error(CryptoKeyManagerErrorEvent e) {}
  ...
}

public class CryptoKeyManagerErrorEvent {
  public int errorCode;
  public String description;
}

Remarks

The event is fired when an error happens in the middle of the class's work.

ErrorCode contains an error code and Description contains a textual description of the error.

Notification Event (CryptoKeyManager Class)

This event notifies the application about an underlying control flow event.

Syntax

public class DefaultCryptoKeyManagerEventListener implements CryptoKeyManagerEventListener {
  ...
  public void notification(CryptoKeyManagerNotificationEvent e) {}
  ...
}

public class CryptoKeyManagerNotificationEvent {
  public String eventID;
  public String eventParam;
}

Remarks

The class fires this event to let the application know about some event, occurrence, or milestone in the class. For example, it may fire to report completion of the document processing. The list of events being reported is not fixed, and may be flexibly extended over time.

The unique identifier of the event is provided in the EventID parameter. EventParam contains any parameters accompanying the occurrence. Depending on the type of the class, the exact action it is performing, or the document being processed, one or both may be omitted.

PasswordNeeded Event (CryptoKeyManager Class)

This event is fired when a decryption password is needed.

Syntax

public class DefaultCryptoKeyManagerEventListener implements CryptoKeyManagerEventListener {
  ...
  public void passwordNeeded(CryptoKeyManagerPasswordNeededEvent e) {}
  ...
}

public class CryptoKeyManagerPasswordNeededEvent {
  public String neededFor;
  public String password; //read-write
  public boolean cancel; //read-write
}

Remarks

The class fires this event when a password is needed to decrypt a certificate or a private key.

In the handler of this event, assign the password to the Password parameter, or set Cancel to true to abort the operation.

The NeededFor parameter identifies the certificate for which the password is requested.

Certificate Type

Encapsulates an individual X.509 certificate.

Remarks

This type keeps and provides access to X.509 certificate details.

Fields

Constructors

public Certificate( bytes,  startIndex,  count,  password);

public Certificate( certBytes,  certStartIndex,  certCount,  keyBytes,  keyStartIndex,  keyCount,  password);

public Certificate( bytes,  startIndex,  count);

public Certificate( path,  password);

public Certificate( certPath,  keyPath,  password);

public Certificate( path);

public Certificate( stream);

public Certificate( stream,  password);

public Certificate( certStream,  keyStream,  password);

public Certificate();

CryptoKey Type

This container represents a cryptographic key.

Remarks

This type is a universal placeholder for cryptographic keys.

Fields

Constructors

public CryptoKey();

Config Settings (CryptoKeyManager 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 method.

CryptoKeyManager Config Settings

Base Config Settings

Trappable Errors (CryptoKeyManager Class)

CryptoKeyManager Errors