| java.lang.Object | |
| ↳ | org.bouncycastle.crypto.signers.DSASigner |
Class Overview
The Digital Signature Algorithm - as described in "Handbook of Applied Cryptography", pages 452 - 453.
Summary
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| Public Methods | |||||||||||
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generate a signature for the given message using the key we were
initialised with.
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initialise the signer for signature generation or signature
verification.
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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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Inherited Methods | |||||||||||
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From class
java.lang.Object
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From interface
org.bouncycastle.crypto.DSA
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Public Constructors
public DSASigner ()
Public Methods
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.
Parameters
| message | the message that will be verified later. |
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Returns
- two big integers representing the r and s values respectively.
public void init (boolean forSigning, CipherParameters param)
initialise the signer for signature generation or signature verification.
Parameters
| forSigning | true if we are generating a signature, false otherwise. |
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| param | key parameters for signature generation. |
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.
Parameters
| message | the message that was supposed to have been signed. |
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| r | the r signature value. |
| s | the s signature value. |