org.bouncycastle.crypto.signers

Class ISO9796d2Signer

public class ISO9796d2Signer extends Object implements SignerWithRecovery

ISO9796-2 - mechanism using a hash function with recovery (scheme 1)
Field Summary
static intTRAILER_IMPLICIT
static intTRAILER_RIPEMD128
static intTRAILER_RIPEMD160
static intTRAILER_SHA1
Constructor Summary
ISO9796d2Signer(AsymmetricBlockCipher cipher, Digest digest, boolean implicit)
Generate a signer for the with either implicit or explicit trailers for ISO9796-2.
ISO9796d2Signer(AsymmetricBlockCipher cipher, Digest digest)
Constructor for a signer with an explicit digest trailer.
Method Summary
byte[]generateSignature()
generate a signature for the loaded message using the key we were initialised with.
byte[]getRecoveredMessage()
Return a reference to the recoveredMessage message.
booleanhasFullMessage()
Return true if the full message was recoveredMessage.
voidinit(boolean forSigning, CipherParameters param)
voidreset()
reset the internal state
voidupdate(byte b)
update the internal digest with the byte b
voidupdate(byte[] in, int off, int len)
update the internal digest with the byte array in
booleanverifySignature(byte[] signature)
return true if the signature represents a ISO9796-2 signature for the passed in message.

Field Detail

TRAILER_IMPLICIT

public static final int TRAILER_IMPLICIT

TRAILER_RIPEMD128

public static final int TRAILER_RIPEMD128

TRAILER_RIPEMD160

public static final int TRAILER_RIPEMD160

TRAILER_SHA1

public static final int TRAILER_SHA1

Constructor Detail

ISO9796d2Signer

public ISO9796d2Signer(AsymmetricBlockCipher cipher, Digest digest, boolean implicit)
Generate a signer for the with either implicit or explicit trailers for ISO9796-2.

Parameters: cipher base cipher to use for signature creation/verification digest digest to use. implicit whether or not the trailer is implicit or gives the hash.

ISO9796d2Signer

public ISO9796d2Signer(AsymmetricBlockCipher cipher, Digest digest)
Constructor for a signer with an explicit digest trailer.

Parameters: cipher cipher to use. digest digest to sign with.

Method Detail

generateSignature

public byte[] generateSignature()
generate a signature for the loaded message using the key we were initialised with.

getRecoveredMessage

public byte[] getRecoveredMessage()
Return a reference to the recoveredMessage message.

Returns: the full/partial recoveredMessage message.

See Also: getRecoveredMessage

hasFullMessage

public boolean hasFullMessage()
Return true if the full message was recoveredMessage.

Returns: true on full message recovery, false otherwise.

See Also: hasFullMessage

init

public void init(boolean forSigning, CipherParameters param)

reset

public void reset()
reset the internal state

update

public void update(byte b)
update the internal digest with the byte b

update

public void update(byte[] in, int off, int len)
update the internal digest with the byte array in

verifySignature

public boolean verifySignature(byte[] signature)
return true if the signature represents a ISO9796-2 signature for the passed in message.