The ISignature Interface

java.lang.String SIGNER_KEY

Variable

A property name in the attributes map that is passed to instances being prepared for signing. The value mapped by this key must be a java.security.PrivateKey that is appropriate for the instance's algorithm (e.g. an instance of DSS would require a subclass of java.security.interfaces.DSAPrivateKey).

java.lang.String VERIFIER_KEY

Variable

A property name in the attributes map that is passed to instances being prepared for verifying a signature. The value mapped by this key must be a java.security.PublicKey that is appropriate for the instance's algorithm, just as is the case with the signing key.

java.lang.String SOURCE_OF_RANDOMNESS

Variable

A property name in the attributes map that is passed to instances being prepared for use as either signers or verifiers. The value mapped must be an already-initialized instance of gnu.crypto.prng.IRandom.

void setupSign (java.util.Map attributes) throws java.lang.IllegalArgumentException

Function

Initializes this instance for signing. The attributes parameter must be a java.util.Map that has, at least, a mapping between the SIGNER_KEY property and the appropriate private key.

void setupVerify (java.util.Map attributes) throws java.lang.IllegalArgumentException

Function

Initializes this instance for verifying a signature. The attributes parameter must be a java.util.Map that has, at least, a mapping between the VERIFIER_KEY property and the appropriate public key.

void update (byte b) throws java.lang.IllegalStateException

Function

Update either the signing or verifying operation with the next byte in the message. This method will throw a java.lang.IllegalStateException if this instance has not been initialized for either signing or verifying.

void update (byte[] buf, int off, int len) throws java.lang.IllegalStateException

Function

Update either the signing or verifying operation with the next len bytes of buf, starting at offset. This method will throw a java.lang.IllegalStateException if this instance has not been initialized for either signing or verifying.

java.lang.Object sign () throws java.lang.IllegalStateException

Function

Finishes a signing operation and returns the final signature. This method will throw a java.lang.IllegalStateException if this instance has not been initialized for signing.

boolean verify (java.lang.Object signature) throws java.lang.IllegalStateException

Function

Finishes a verifying operation by checking if the argument, a native signature object, matches the expected signature. This methods returns true if the signature is valid, false otherwise. This method will throw a java.lang.IllegalStateException if this instance has not been initialized for verifying.

java.lang.String name ()

Function

Returns the canonical name of this instance's signature algorithm.

java.lang.Object clone ()

Function

Returns a copy of this signature object.