DSA Module

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

Syntax

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. To create a new key call CreateKey. Alternatively an existing certificate may be specified by setting Certificate

Signing

To sign data first set Key or Certificate. Select the input file by setting InputFile or InputMessage. Next call Sign. The Sign method will automatically compute the hash, and then sign the hash with the specified key.

Send the public key (see CreateKey for details), file, and HashSignature to the recipient.

To sign a hash without recomputing the hash simply set HashValue to the pre-computed hash value before calling Sign.

Signature Verification

To verify a signature specify the input data using InputFile or InputMessage. Set SignerKey or SignerCert. Next set HashSignature and call VerifySignature. The VerifySignature method will return True if the signature was successfully verified.

To verify a hash signature without recomputing the hash simply set HashValue to the pre-computed hash value before calling VerifySignature.

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 InputFile or InputMessage, the hash will be recomputed when calling Sign or VerifySignature. If the HashValue property is set, the class will only sign the hash or verify the hash signature. Setting InputFile or InputMessage clears the HashValue property. Setting the HashValue property clears the input file selection.

DSA Key Notes

A DSA key is made up of a number of individual parameters. When calling CreateKey the Key property is populated with a new private and public key.

After calling Sign the public key must be sent to the recipient along with HashSignature so they may perform signature verification. Likewise you must obtain the public key along with HashSignature in order to perform signature verification.

The public key consists of the following parameters:

• KeyP
• KeyQ
• KeyG
• KeyY

The class also includes the KeyPublicKey property 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 KeyPublicKey in which case the individual parameters must be sent.

The private key consists of the following parameters:

• KeyP
• KeyQ
• KeyG
• KeyY
• KeyX

Property List

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

Method List

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

Event List

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

Config Settings

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

Certificate Property (DSA Module)

The certificate used for signing.

Syntax

• Swift
• Objective-C

public var certificate: Certificate {
  get {...}
  set {...}
}

@property (nonatomic,readonly,assign,getter=certEffectiveDate) NSString* certEffectiveDate;

- (NSString*)certEffectiveDate;

@property (nonatomic,readonly,assign,getter=certExpirationDate) NSString* certExpirationDate;

- (NSString*)certExpirationDate;

@property (nonatomic,readonly,assign,getter=certExtendedKeyUsage) NSString* certExtendedKeyUsage;

- (NSString*)certExtendedKeyUsage;

@property (nonatomic,readonly,assign,getter=certFingerprint) NSString* certFingerprint;

- (NSString*)certFingerprint;

@property (nonatomic,readonly,assign,getter=certFingerprintSHA1) NSString* certFingerprintSHA1;

- (NSString*)certFingerprintSHA1;

@property (nonatomic,readonly,assign,getter=certFingerprintSHA256) NSString* certFingerprintSHA256;

- (NSString*)certFingerprintSHA256;

@property (nonatomic,readonly,assign,getter=certIssuer) NSString* certIssuer;

- (NSString*)certIssuer;

@property (nonatomic,readonly,assign,getter=certPrivateKey) NSString* certPrivateKey;

- (NSString*)certPrivateKey;

@property (nonatomic,readonly,assign,getter=certPrivateKeyAvailable) BOOL certPrivateKeyAvailable;

- (BOOL)certPrivateKeyAvailable;

@property (nonatomic,readonly,assign,getter=certPrivateKeyContainer) NSString* certPrivateKeyContainer;

- (NSString*)certPrivateKeyContainer;

@property (nonatomic,readonly,assign,getter=certPublicKey) NSString* certPublicKey;

- (NSString*)certPublicKey;

@property (nonatomic,readonly,assign,getter=certPublicKeyAlgorithm) NSString* certPublicKeyAlgorithm;

- (NSString*)certPublicKeyAlgorithm;

@property (nonatomic,readonly,assign,getter=certPublicKeyLength) int certPublicKeyLength;

- (int)certPublicKeyLength;

@property (nonatomic,readonly,assign,getter=certSerialNumber) NSString* certSerialNumber;

- (NSString*)certSerialNumber;

@property (nonatomic,readonly,assign,getter=certSignatureAlgorithm) NSString* certSignatureAlgorithm;

- (NSString*)certSignatureAlgorithm;

@property (nonatomic,readwrite,assign,getter=certStore,setter=setCertStore:) NSString* certStore;

- (NSString*)certStore;
- (void)setCertStore :(NSString*)newCertStore;

@property (nonatomic,readwrite,assign,getter=certStoreB,setter=setCertStoreB:) NSData* certStoreB;

- (NSData*)certStoreB;
- (void)setCertStoreB :(NSData*)newCertStore;
@property (nonatomic,readwrite,assign,getter=certStorePassword,setter=setCertStorePassword:) NSString* certStorePassword;

- (NSString*)certStorePassword;
- (void)setCertStorePassword :(NSString*)newCertStorePassword;

@property (nonatomic,readwrite,assign,getter=certStoreType,setter=setCertStoreType:) int certStoreType;

- (int)certStoreType;
- (void)setCertStoreType :(int)newCertStoreType;

@property (nonatomic,readonly,assign,getter=certSubjectAltNames) NSString* certSubjectAltNames;

- (NSString*)certSubjectAltNames;

@property (nonatomic,readonly,assign,getter=certThumbprintMD5) NSString* certThumbprintMD5;

- (NSString*)certThumbprintMD5;

@property (nonatomic,readonly,assign,getter=certThumbprintSHA1) NSString* certThumbprintSHA1;

- (NSString*)certThumbprintSHA1;

@property (nonatomic,readonly,assign,getter=certThumbprintSHA256) NSString* certThumbprintSHA256;

- (NSString*)certThumbprintSHA256;

@property (nonatomic,readonly,assign,getter=certUsage) NSString* certUsage;

- (NSString*)certUsage;

@property (nonatomic,readonly,assign,getter=certUsageFlags) int certUsageFlags;

- (int)certUsageFlags;

@property (nonatomic,readonly,assign,getter=certVersion) NSString* certVersion;

- (NSString*)certVersion;

@property (nonatomic,readwrite,assign,getter=certSubject,setter=setCertSubject:) NSString* certSubject;

- (NSString*)certSubject;
- (void)setCertSubject :(NSString*)newCertSubject;

@property (nonatomic,readwrite,assign,getter=certEncoded,setter=setCertEncoded:) NSString* certEncoded;

- (NSString*)certEncoded;
- (void)setCertEncoded :(NSString*)newCertEncoded;

@property (nonatomic,readwrite,assign,getter=certEncodedB,setter=setCertEncodedB:) NSData* certEncodedB;

- (NSData*)certEncodedB;
- (void)setCertEncodedB :(NSData*)newCertEncoded;
 

Default Value

False

Remarks

This property specifies a certificate with private key.

This may be set instead of Key. This allows a Certificate object to be used instead of a DSAKey object. This certificate is used when calling Sign. The specified certificate must have a private key.

If both this property and Key are specified, Key will be used and this property will be ignored.

HashAlgorithm Property (DSA Module)

The hash algorithm used for hash computation.

Syntax

• Swift
• Objective-C

public var hashAlgorithm: DSAHashAlgorithms {
  get {...}
  set {...}
}

public enum DSAHashAlgorithms: Int32 {
  case dhaSHA1 = 0
  case dhaSHA224 = 1
  case dhaSHA256 = 2
  case dhaSHA384 = 3
  case dhaSHA512 = 4
  case dhaRIPEMD160 = 5
}

@property (nonatomic,readwrite,assign,getter=hashAlgorithm,setter=setHashAlgorithm:) int hashAlgorithm;

- (int)hashAlgorithm;
- (void)setHashAlgorithm :(int)newHashAlgorithm;

Default Value

2

Remarks

This property specifies the hash algorithm used for hash computation. This is only applicable when calling Sign or VerifySignature and HashValue is computed. Possible values are:

HashSignature Property (DSA Module)

The hash signature.

Syntax

• Swift
• Objective-C

public var hashSignature: String {
  get {...}
  set {...}
}

public var hashSignatureB: Data {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=hashSignature,setter=setHashSignature:) NSString* hashSignature;

- (NSString*)hashSignature;
- (void)setHashSignature :(NSString*)newHashSignature;

@property (nonatomic,readwrite,assign,getter=hashSignatureB,setter=setHashSignatureB:) NSData* hashSignatureB;

- (NSData*)hashSignatureB;
- (void)setHashSignatureB :(NSData*)newHashSignature;

Default Value

""

Remarks

This property holds the computed hash signature. This is populated after calling Sign. This must be set before calling VerifySignature.

HashValue Property (DSA Module)

The hash value of the data.

Syntax

• Swift
• Objective-C

public var hashData: String {
  get {...}
  set {...}
}

public var hashDataB: Data {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=hashValue,setter=setHashValue:) NSString* hashValue;

- (NSString*)hashValue;
- (void)setHashValue :(NSString*)newHashValue;

@property (nonatomic,readwrite,assign,getter=hashValueB,setter=setHashValueB:) NSData* hashValueB;

- (NSData*)hashValueB;
- (void)setHashValueB :(NSData*)newHashValue;

Default Value

""

Remarks

This property holds the computed hash value for the specified data. This is populated when calling Sign or VerifySignature when an input file is specified by setting InputFile or InputMessage.

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 InputFile or InputMessage, the hash will be recomputed when calling Sign or VerifySignature. If the HashValue property is set, the class will only sign the hash or verify the hash signature. Setting InputFile or InputMessage clears the HashValue property. Setting the HashValue property clears the input file selection.

InputFile Property (DSA Module)

The file to process.

Syntax

• Swift
• Objective-C

public var inputFile: String {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=inputFile,setter=setInputFile:) NSString* inputFile;

- (NSString*)inputFile;
- (void)setInputFile :(NSString*)newInputFile;

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:

• InputFile
• InputMessage

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

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

InputMessage Property (DSA Module)

The message to process.

Syntax

• Swift
• Objective-C

public var inputMessage: String {
  get {...}
  set {...}
}

public var inputMessageB: Data {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=inputMessage,setter=setInputMessage:) NSString* inputMessage;

- (NSString*)inputMessage;
- (void)setInputMessage :(NSString*)newInputMessage;

@property (nonatomic,readwrite,assign,getter=inputMessageB,setter=setInputMessageB:) NSData* inputMessageB;

- (NSData*)inputMessageB;
- (void)setInputMessageB :(NSData*)newInputMessage;

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:

• InputFile
• InputMessage

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

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

Key Property (DSA Module)

The DSA key.

Syntax

• Swift
• Objective-C

public var key: DSAKey {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=keyG,setter=setKeyG:) NSString* keyG;

- (NSString*)keyG;
- (void)setKeyG :(NSString*)newKeyG;

@property (nonatomic,readwrite,assign,getter=keyGB,setter=setKeyGB:) NSData* keyGB;

- (NSData*)keyGB;
- (void)setKeyGB :(NSData*)newKeyG;
@property (nonatomic,readwrite,assign,getter=keyP,setter=setKeyP:) NSString* keyP;

- (NSString*)keyP;
- (void)setKeyP :(NSString*)newKeyP;

@property (nonatomic,readwrite,assign,getter=keyPB,setter=setKeyPB:) NSData* keyPB;

- (NSData*)keyPB;
- (void)setKeyPB :(NSData*)newKeyP;
@property (nonatomic,readwrite,assign,getter=keyPrivateKey,setter=setKeyPrivateKey:) NSString* keyPrivateKey;

- (NSString*)keyPrivateKey;
- (void)setKeyPrivateKey :(NSString*)newKeyPrivateKey;

@property (nonatomic,readwrite,assign,getter=keyPublicKey,setter=setKeyPublicKey:) NSString* keyPublicKey;

- (NSString*)keyPublicKey;
- (void)setKeyPublicKey :(NSString*)newKeyPublicKey;

@property (nonatomic,readwrite,assign,getter=keyQ,setter=setKeyQ:) NSString* keyQ;

- (NSString*)keyQ;
- (void)setKeyQ :(NSString*)newKeyQ;

@property (nonatomic,readwrite,assign,getter=keyQB,setter=setKeyQB:) NSData* keyQB;

- (NSData*)keyQB;
- (void)setKeyQB :(NSData*)newKeyQ;
@property (nonatomic,readwrite,assign,getter=keyX,setter=setKeyX:) NSString* keyX;

- (NSString*)keyX;
- (void)setKeyX :(NSString*)newKeyX;

@property (nonatomic,readwrite,assign,getter=keyXB,setter=setKeyXB:) NSData* keyXB;

- (NSData*)keyXB;
- (void)setKeyXB :(NSData*)newKeyX;
@property (nonatomic,readwrite,assign,getter=keyY,setter=setKeyY:) NSString* keyY;

- (NSString*)keyY;
- (void)setKeyY :(NSString*)newKeyY;

@property (nonatomic,readwrite,assign,getter=keyYB,setter=setKeyYB:) NSData* keyYB;

- (NSData*)keyYB;
- (void)setKeyYB :(NSData*)newKeyY;
 

Default Value

False

Remarks

This property specifies the DSA key used to create a signature. This property must be set before calling Sign. Alternatively, a certificate may be specified by setting Certificate

DSA Key Notes

A DSA key is made up of a number of individual parameters. When calling CreateKey the Key property is populated with a new private and public key.

After calling Sign the public key must be sent to the recipient along with HashSignature so they may perform signature verification. Likewise you must obtain the public key along with HashSignature in order to perform signature verification.

The public key consists of the following parameters:

• KeyP
• KeyQ
• KeyG
• KeyY

The class also includes the KeyPublicKey property 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 KeyPublicKey in which case the individual parameters must be sent.

The private key consists of the following parameters:

• KeyP
• KeyQ
• KeyG
• KeyY
• KeyX

SignerCert Property (DSA Module)

The certificate used for signature verification.

Syntax

• Swift
• Objective-C

public var signerCert: Certificate {
  get {...}
  set {...}
}

@property (nonatomic,readonly,assign,getter=signerCertEffectiveDate) NSString* signerCertEffectiveDate;

- (NSString*)signerCertEffectiveDate;

@property (nonatomic,readonly,assign,getter=signerCertExpirationDate) NSString* signerCertExpirationDate;

- (NSString*)signerCertExpirationDate;

@property (nonatomic,readonly,assign,getter=signerCertExtendedKeyUsage) NSString* signerCertExtendedKeyUsage;

- (NSString*)signerCertExtendedKeyUsage;

@property (nonatomic,readonly,assign,getter=signerCertFingerprint) NSString* signerCertFingerprint;

- (NSString*)signerCertFingerprint;

@property (nonatomic,readonly,assign,getter=signerCertFingerprintSHA1) NSString* signerCertFingerprintSHA1;

- (NSString*)signerCertFingerprintSHA1;

@property (nonatomic,readonly,assign,getter=signerCertFingerprintSHA256) NSString* signerCertFingerprintSHA256;

- (NSString*)signerCertFingerprintSHA256;

@property (nonatomic,readonly,assign,getter=signerCertIssuer) NSString* signerCertIssuer;

- (NSString*)signerCertIssuer;

@property (nonatomic,readonly,assign,getter=signerCertPrivateKey) NSString* signerCertPrivateKey;

- (NSString*)signerCertPrivateKey;

@property (nonatomic,readonly,assign,getter=signerCertPrivateKeyAvailable) BOOL signerCertPrivateKeyAvailable;

- (BOOL)signerCertPrivateKeyAvailable;

@property (nonatomic,readonly,assign,getter=signerCertPrivateKeyContainer) NSString* signerCertPrivateKeyContainer;

- (NSString*)signerCertPrivateKeyContainer;

@property (nonatomic,readonly,assign,getter=signerCertPublicKey) NSString* signerCertPublicKey;

- (NSString*)signerCertPublicKey;

@property (nonatomic,readonly,assign,getter=signerCertPublicKeyAlgorithm) NSString* signerCertPublicKeyAlgorithm;

- (NSString*)signerCertPublicKeyAlgorithm;

@property (nonatomic,readonly,assign,getter=signerCertPublicKeyLength) int signerCertPublicKeyLength;

- (int)signerCertPublicKeyLength;

@property (nonatomic,readonly,assign,getter=signerCertSerialNumber) NSString* signerCertSerialNumber;

- (NSString*)signerCertSerialNumber;

@property (nonatomic,readonly,assign,getter=signerCertSignatureAlgorithm) NSString* signerCertSignatureAlgorithm;

- (NSString*)signerCertSignatureAlgorithm;

@property (nonatomic,readwrite,assign,getter=signerCertStore,setter=setSignerCertStore:) NSString* signerCertStore;

- (NSString*)signerCertStore;
- (void)setSignerCertStore :(NSString*)newSignerCertStore;

@property (nonatomic,readwrite,assign,getter=signerCertStoreB,setter=setSignerCertStoreB:) NSData* signerCertStoreB;

- (NSData*)signerCertStoreB;
- (void)setSignerCertStoreB :(NSData*)newSignerCertStore;
@property (nonatomic,readwrite,assign,getter=signerCertStorePassword,setter=setSignerCertStorePassword:) NSString* signerCertStorePassword;

- (NSString*)signerCertStorePassword;
- (void)setSignerCertStorePassword :(NSString*)newSignerCertStorePassword;

@property (nonatomic,readwrite,assign,getter=signerCertStoreType,setter=setSignerCertStoreType:) int signerCertStoreType;

- (int)signerCertStoreType;
- (void)setSignerCertStoreType :(int)newSignerCertStoreType;

@property (nonatomic,readonly,assign,getter=signerCertSubjectAltNames) NSString* signerCertSubjectAltNames;

- (NSString*)signerCertSubjectAltNames;

@property (nonatomic,readonly,assign,getter=signerCertThumbprintMD5) NSString* signerCertThumbprintMD5;

- (NSString*)signerCertThumbprintMD5;

@property (nonatomic,readonly,assign,getter=signerCertThumbprintSHA1) NSString* signerCertThumbprintSHA1;

- (NSString*)signerCertThumbprintSHA1;

@property (nonatomic,readonly,assign,getter=signerCertThumbprintSHA256) NSString* signerCertThumbprintSHA256;

- (NSString*)signerCertThumbprintSHA256;

@property (nonatomic,readonly,assign,getter=signerCertUsage) NSString* signerCertUsage;

- (NSString*)signerCertUsage;

@property (nonatomic,readonly,assign,getter=signerCertUsageFlags) int signerCertUsageFlags;

- (int)signerCertUsageFlags;

@property (nonatomic,readonly,assign,getter=signerCertVersion) NSString* signerCertVersion;

- (NSString*)signerCertVersion;

@property (nonatomic,readwrite,assign,getter=signerCertSubject,setter=setSignerCertSubject:) NSString* signerCertSubject;

- (NSString*)signerCertSubject;
- (void)setSignerCertSubject :(NSString*)newSignerCertSubject;

@property (nonatomic,readwrite,assign,getter=signerCertEncoded,setter=setSignerCertEncoded:) NSString* signerCertEncoded;

- (NSString*)signerCertEncoded;
- (void)setSignerCertEncoded :(NSString*)newSignerCertEncoded;

@property (nonatomic,readwrite,assign,getter=signerCertEncodedB,setter=setSignerCertEncodedB:) NSData* signerCertEncodedB;

- (NSData*)signerCertEncodedB;
- (void)setSignerCertEncodedB :(NSData*)newSignerCertEncoded;
 

Default Value

False

Remarks

This property specifies a certificate for signature verification.

This may be set instead of SignerKey. This allows a Certificate object to be used instead of a DSAKey object. This certificate is used when calling VerifySignature.

If both this property and SignerKey are specified, SignerKey will be used and this property will be ignored.

SignerKey Property (DSA Module)

The public key used to verify the signature.

Syntax

• Swift
• Objective-C

public var signerKey: DSAKey {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=signerKeyG,setter=setSignerKeyG:) NSString* signerKeyG;

- (NSString*)signerKeyG;
- (void)setSignerKeyG :(NSString*)newSignerKeyG;

@property (nonatomic,readwrite,assign,getter=signerKeyGB,setter=setSignerKeyGB:) NSData* signerKeyGB;

- (NSData*)signerKeyGB;
- (void)setSignerKeyGB :(NSData*)newSignerKeyG;
@property (nonatomic,readwrite,assign,getter=signerKeyP,setter=setSignerKeyP:) NSString* signerKeyP;

- (NSString*)signerKeyP;
- (void)setSignerKeyP :(NSString*)newSignerKeyP;

@property (nonatomic,readwrite,assign,getter=signerKeyPB,setter=setSignerKeyPB:) NSData* signerKeyPB;

- (NSData*)signerKeyPB;
- (void)setSignerKeyPB :(NSData*)newSignerKeyP;
@property (nonatomic,readwrite,assign,getter=signerKeyPublicKey,setter=setSignerKeyPublicKey:) NSString* signerKeyPublicKey;

- (NSString*)signerKeyPublicKey;
- (void)setSignerKeyPublicKey :(NSString*)newSignerKeyPublicKey;

@property (nonatomic,readwrite,assign,getter=signerKeyQ,setter=setSignerKeyQ:) NSString* signerKeyQ;

- (NSString*)signerKeyQ;
- (void)setSignerKeyQ :(NSString*)newSignerKeyQ;

@property (nonatomic,readwrite,assign,getter=signerKeyQB,setter=setSignerKeyQB:) NSData* signerKeyQB;

- (NSData*)signerKeyQB;
- (void)setSignerKeyQB :(NSData*)newSignerKeyQ;
@property (nonatomic,readwrite,assign,getter=signerKeyY,setter=setSignerKeyY:) NSString* signerKeyY;

- (NSString*)signerKeyY;
- (void)setSignerKeyY :(NSString*)newSignerKeyY;

@property (nonatomic,readwrite,assign,getter=signerKeyYB,setter=setSignerKeyYB:) NSData* signerKeyYB;

- (NSData*)signerKeyYB;
- (void)setSignerKeyYB :(NSData*)newSignerKeyY;
 

Default Value

False

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. Alternatively, a certificate may be specified by setting SignerCert

DSA Key Notes

A DSA key is made up of a number of individual parameters. When calling CreateKey the Key property is populated with a new private and public key.

After calling Sign the public key must be sent to the recipient along with HashSignature so they may perform signature verification. Likewise you must obtain the public key along with HashSignature in order to perform signature verification.

The public key consists of the following parameters:

• KeyP
• KeyQ
• KeyG
• KeyY

The class also includes the KeyPublicKey property 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 KeyPublicKey in which case the individual parameters must be sent.

The private key consists of the following parameters:

• KeyP
• KeyQ
• KeyG
• KeyY
• KeyX

UseHex Property (DSA Module)

Whether HashValue and HashSignature are hex encoded.

Syntax

• Swift
• Objective-C

public var useHex: Bool {
  get {...}
  set {...}
}

@property (nonatomic,readwrite,assign,getter=useHex,setter=setUseHex:) BOOL useHex;

- (BOOL)useHex;
- (void)setUseHex :(BOOL)newUseHex;

Default Value

False

Remarks

This property specifies whether HashValue and HashSignature are hex encoded.

If set to True, when Sign is called the class will compute the hash for the specified file and populate HashValue with the hex encoded hash value. It will then create the hash signature and populate HashSignature with the hex encoded hash signature value. If HashValue is specified directly, it must be a hex encoded value.

If set to True, when VerifySignature is called the class will compute the hash value for the specified file and populate HashValue with the hex encoded hash value. It will then hex decode HashSignature and verify the signature. HashSignature must hold a hex encoded value. If HashValue is specified directly, it must be a hex encoded value.

Config Method (DSA Module)

Sets or retrieves a configuration setting.

Syntax

• Swift
• Objective-C

public func config(configurationString: String) throws -> String

- (NSString*)config:(NSString*)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.

CreateKey Method (DSA Module)

Creates a new key.

Syntax

• Swift
• Objective-C

public func createKey() throws -> Void

- (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 property is populated with a new private and public key.

After calling Sign the public key must be sent to the recipient along with HashSignature so they may perform signature verification. Likewise you must obtain the public key along with HashSignature in order to perform signature verification.

The public key consists of the following parameters:

• KeyP
• KeyQ
• KeyG
• KeyY

The class also includes the KeyPublicKey property 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 KeyPublicKey in which case the individual parameters must be sent.

The private key consists of the following parameters:

• KeyP
• KeyQ
• KeyG
• KeyY
• KeyX

Reset Method (DSA Module)

Resets the component.

Syntax

• Swift
• Objective-C

public func reset() throws -> Void

- (void)reset;

Remarks

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

Sign Method (DSA Module)

Creates a hash signature.

Syntax

• Swift
• Objective-C

public func sign() throws -> Void

- (void)sign;

Remarks

This method will create a hash signature.

Before calling this method specify the input file by setting InputFile or InputMessage.

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

To create the hash signature without first computing the hash simply specify HashValue before calling this method.

The Progress 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 Module)

Verifies the signature for the specified data.

Syntax

• Swift
• Objective-C

public func verifySignature() throws -> Bool

- (BOOL)verifySignature;

Remarks

This method will verify a hash signature.

Before calling this method specify the input file by setting InputFile or InputMessage.

A public key and the hash signature are required to perform the signature verification. Specify the public key in SignerKey. Alternatively, a certificate may be specified by setting SignerCert. Specify the hash signature in HashSignature.

When this method is called the class will compute the hash for the specified file and populate HashValue. It will verify the signature using the specified SignerKey and HashSignature.

To verify the hash signature without first computing the hash simply specify HashValue before calling this method.

The Progress 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 Module)

Fired when information is available about errors during data delivery.

Syntax

• Swift
• Objective-C

func onError(errorCode: Int32, description: String)

- (void)onError:(int)errorCode :(NSString*)description;

Remarks

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

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 section.

Progress Event (DSA Module)

Fired as progress is made.

Syntax

• Swift
• Objective-C

func onProgress(bytesProcessed: Int64, percentProcessed: Int32)

- (void)onProgress:(long long)bytesProcessed :(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.

Fields

Constructors

public init()

public init(encoded: )

public init(storeType: , store: , storePassword: , subject: )

public init(storeType: , store: , storePassword: , subject: )

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 the Key property is populated with a new private and public key.

After calling Sign the public key must be sent to the recipient along with HashSignature so they may perform signature verification. Likewise you must obtain the public key along with HashSignature in order to perform signature verification.

The public key consists of the following parameters:

• KeyP
• KeyQ
• KeyG
• KeyY

The class also includes the KeyPublicKey property 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 KeyPublicKey in which case the individual parameters must be sent.

The private key consists of the following parameters:

• KeyP
• KeyQ
• KeyG
• KeyY
• KeyX

Fields

Constructors

public init()

public init(p: , q: , g: , y: )

public init(p: , q: , g: , y: , x: )

Config Settings (DSA Module)

DSA Config Settings

Base Config Settings

Trappable Errors (DSA Module)

DSA Errors