org.bouncycastle.crypto.signers
Class DSASigner
java.lang.Object
org.bouncycastle.crypto.signers.DSASigner
- DSA
public class DSASigner
extends java.lang.Object
The Digital Signature Algorithm - as described in "Handbook of Applied
Cryptography", pages 452 - 453.
BigInteger[] | generateSignature(byte[] message) - generate a signature for the given message using the key we were
initialised with.
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void | init(boolean forSigning, CipherParameters param) - initialise the signer for signature generation or signature
verification.
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boolean | verifySignature(byte[] message, BigInteger r, BigInteger s) - return true if the value r and s represent a DSA signature for
the passed in message for standard DSA the message should be a
SHA-1 hash of the real message to be verified.
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generateSignature
public BigInteger[] generateSignature(byte[] message)
generate a signature for the given message using the key we were
initialised with. For conventional DSA the message should be a SHA-1
hash of the message of interest.
- generateSignature in interface DSA
message
- the message that will be verified later.
init
public void init(boolean forSigning,
CipherParameters param)
initialise the signer for signature generation or signature
verification.
- init in interface DSA
forSigning
- true if we are generating a signature, false
otherwise.param
- key parameters for signature generation.
verifySignature
public boolean verifySignature(byte[] message,
BigInteger r,
BigInteger s)
return true if the value r and s represent a DSA signature for
the passed in message for standard DSA the message should be a
SHA-1 hash of the real message to be verified.
- verifySignature in interface DSA