org.bouncycastle.crypto.signers

Class PSSSigner

java.lang.Object

org.bouncycastle.crypto.signers.PSSSigner

All Implemented Interfaces:

Signer

public class PSSSigner
extends java.lang.Object
implements Signer

RSA-PSS as described in PKCS# 1 v 2.1.

Note: the usual value for the salt length is the number of bytes in the hash function.

Field Summary

Fields

Modifier and Type	Field and Description
static byte	TRAILER_IMPLICIT

Constructor Summary

Constructors

Constructor and Description
PSSSigner(AsymmetricBlockCipher cipher, Digest contentDigest, Digest mgfDigest, int sLen)
PSSSigner(AsymmetricBlockCipher cipher, Digest contentDigest, Digest mgfDigest, int sLen, byte trailer)
PSSSigner(AsymmetricBlockCipher cipher, Digest digest, int sLen) basic constructor
PSSSigner(AsymmetricBlockCipher cipher, Digest digest, int sLen, byte trailer)

Method Summary

Modifier and Type	Method and Description
byte[]	generateSignature() generate a signature for the message we've been loaded with using the key we were initialised with.
void	init(boolean forSigning, CipherParameters param) Initialise the signer for signing or verification.
void	reset() reset the internal state
void	update(byte b) update the internal digest with the byte b
void	update(byte[] in, int off, int len) update the internal digest with the byte array in
boolean	verifySignature(byte[] signature) return true if the internal state represents the signature described in the passed in array.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

TRAILER_IMPLICIT

public static final byte TRAILER_IMPLICIT

See Also:

Constant Field Values

Constructor Detail

PSSSigner

public PSSSigner(AsymmetricBlockCipher cipher,
                 Digest digest,
                 int sLen)

basic constructor

Parameters:

cipher - the asymmetric cipher to use.

digest - the digest to use.

sLen - the length of the salt to use (in bytes).

PSSSigner

public PSSSigner(AsymmetricBlockCipher cipher,
                 Digest contentDigest,
                 Digest mgfDigest,
                 int sLen)

PSSSigner

public PSSSigner(AsymmetricBlockCipher cipher,
                 Digest digest,
                 int sLen,
                 byte trailer)

PSSSigner

public PSSSigner(AsymmetricBlockCipher cipher,
                 Digest contentDigest,
                 Digest mgfDigest,
                 int sLen,
                 byte trailer)

Method Detail

init

public void init(boolean forSigning,
                 CipherParameters param)

Description copied from interface: Signer

Initialise the signer for signing or verification.

Specified by:

init in interface Signer

Parameters:

forSigning - true if for signing, false otherwise

param - necessary parameters.

update

public void update(byte b)

update the internal digest with the byte b

Specified by:

update in interface Signer

update

public void update(byte[] in,
                   int off,
                   int len)

update the internal digest with the byte array in

Specified by:

update in interface Signer

reset

public void reset()

reset the internal state

Specified by:

reset in interface Signer

generateSignature

public byte[] generateSignature()
                         throws CryptoException,
                                DataLengthException

generate a signature for the message we've been loaded with using the key we were initialised with.

Specified by:

generateSignature in interface Signer

Throws:

CryptoException

DataLengthException

verifySignature

public boolean verifySignature(byte[] signature)

return true if the internal state represents the signature described in the passed in array.

Specified by:

verifySignature in interface Signer