Top Description Fields Constructors Methods
org.bouncycastle.crypto.internal.signers

public Class BaseISO9796d2Signer

extends Object
implements SignerWithRecovery
Class Inheritance
All Implemented Interfaces
org.bouncycastle.crypto.internal.SignerWithRecovery, org.bouncycastle.crypto.internal.Signer
Known Direct Subclasses
org.bouncycastle.crypto.general.ISO9796d2Signer
Imports
org.bouncycastle.crypto.internal.AsymmetricBlockCipher, .CipherParameters, .CryptoException, .Digest, .InvalidCipherTextException, .SignerWithRecovery, org.bouncycastle.crypto.internal.params.ParametersWithRandom, .RsaKeyParameters, org.bouncycastle.crypto.internal.util.ISOTrailers, org.bouncycastle.util.Arrays
ISO9796-2 - mechanism using a hash function with recovery (scheme 1)

Field Summary

Modifier and TypeField and Description
private byte[]
block

private AsymmetricBlockCipher
cipher

private Digest
digest

private boolean
fullMessage

private int
keyBits

private byte[]
mBuf

private int
messageLength

private byte[]
preBlock

private byte[]
preSig

private byte[]
recoveredMessage

private int
trailer

public static final int
TRAILER_IMPLICIT

Constructor Summary

AccessConstructor and Description
public
BaseISO9796d2Signer(AsymmetricBlockCipher
base cipher to use for signature creation/verification
cipher, Digest
digest to use.
digest, boolean
whether or not the trailer is implicit or gives the hash.
implicit)

Generate a signer with either implicit or explicit trailers for ISO9796-2.

Method Summary

Modifier and TypeMethod and Description
private void
clearBlock(byte[] block)

clear possible sensitive data

public byte[]
generateSignature()

Implements org.bouncycastle.crypto.internal.Signer.generateSignature.

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

Returns:

the full/partial recoveredMessage message.
getRecoveredMessage()

Implements org.bouncycastle.crypto.internal.SignerWithRecovery.getRecoveredMessage.

Return a reference to the recoveredMessage message, either as it was added to a just generated signature, or extracted from a verified one.
public boolean

Returns:

true on full message recovery, false otherwise.
hasFullMessage()

Implements org.bouncycastle.crypto.internal.SignerWithRecovery.hasFullMessage.

Return true if the full message was recoveredMessage.
public void
init(boolean
true if for signing, false otherwise
forSigning, CipherParameters
necessary parameters.
param)

Implements org.bouncycastle.crypto.internal.Signer.init.

Initialise the signer for signing or verification.
private boolean
isSameAs(byte[] a, byte[] b)

compare two byte arrays - constant time

public void
reset()

Implements org.bouncycastle.crypto.internal.Signer.reset.

reset the internal state
private boolean
returnFalse(byte[] block)

public void
update(byte b)

Implements org.bouncycastle.crypto.internal.Signer.update.

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

Implements org.bouncycastle.crypto.internal.Signer.update.

update the internal digest with the byte array in
public void
updateWithRecoveredMessage(byte[]
the signature that we are in the process of verifying.
signature)

Implements org.bouncycastle.crypto.internal.SignerWithRecovery.updateWithRecoveredMessage.

Perform an update with the recovered message before adding any other data.
public boolean
verifySignature(byte[] signature)

Implements org.bouncycastle.crypto.internal.Signer.verifySignature.

return true if the signature represents a ISO9796-2 signature for the passed in message.
Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

blockback to summary
private byte[] block
cipherback to summary
private AsymmetricBlockCipher cipher
digestback to summary
private Digest digest
fullMessageback to summary
private boolean fullMessage
keyBitsback to summary
private int keyBits
mBufback to summary
private byte[] mBuf
messageLengthback to summary
private int messageLength
preBlockback to summary
private byte[] preBlock
preSigback to summary
private byte[] preSig
recoveredMessageback to summary
private byte[] recoveredMessage
trailerback to summary
private int trailer
TRAILER_IMPLICITback to summary
public static final int TRAILER_IMPLICIT

Constructor Detail

BaseISO9796d2Signerback to summary
public BaseISO9796d2Signer(AsymmetricBlockCipher cipher, Digest digest, boolean implicit)

Generate a signer with either implicit or explicit trailers for ISO9796-2.

Parameters
cipher:AsymmetricBlockCipher

base cipher to use for signature creation/verification

digest:Digest

digest to use.

implicit:boolean

whether or not the trailer is implicit or gives the hash.

Method Detail

clearBlockback to summary
private void clearBlock(byte[] block)

clear possible sensitive data

generateSignatureback to summary
public byte[] generateSignature() throws CryptoException

Implements org.bouncycastle.crypto.internal.Signer.generateSignature.

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

getRecoveredMessageback to summary
public byte[] getRecoveredMessage()

Implements org.bouncycastle.crypto.internal.SignerWithRecovery.getRecoveredMessage.

Return a reference to the recoveredMessage message, either as it was added to a just generated signature, or extracted from a verified one.

Returns:byte[]

the full/partial recoveredMessage message.

See Also
org.bouncycastle.crypto.internal.SignerWithRecovery#getRecoveredMessage()
hasFullMessageback to summary
public boolean hasFullMessage()

Implements org.bouncycastle.crypto.internal.SignerWithRecovery.hasFullMessage.

Return true if the full message was recoveredMessage.

Returns:boolean

true on full message recovery, false otherwise.

See Also
org.bouncycastle.crypto.internal.SignerWithRecovery#hasFullMessage()
initback to summary
public void init(boolean forSigning, CipherParameters param)

Implements org.bouncycastle.crypto.internal.Signer.init.

Doc from org.bouncycastle.crypto.internal.Signer.init.

Initialise the signer for signing or verification.

Parameters
forSigning:boolean

true if for signing, false otherwise

param:CipherParameters

necessary parameters.

isSameAsback to summary
private boolean isSameAs(byte[] a, byte[] b)

compare two byte arrays - constant time

resetback to summary
public void reset()

Implements org.bouncycastle.crypto.internal.Signer.reset.

reset the internal state

returnFalseback to summary
private boolean returnFalse(byte[] block)
updateback to summary
public void update(byte b)

Implements org.bouncycastle.crypto.internal.Signer.update.

update the internal digest with the byte b

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

Implements org.bouncycastle.crypto.internal.Signer.update.

update the internal digest with the byte array in

updateWithRecoveredMessageback to summary
public void updateWithRecoveredMessage(byte[] signature) throws InvalidCipherTextException

Implements org.bouncycastle.crypto.internal.SignerWithRecovery.updateWithRecoveredMessage.

Doc from org.bouncycastle.crypto.internal.SignerWithRecovery.updateWithRecoveredMessage.

Perform an update with the recovered message before adding any other data. This must be the first update method called, and calling it will result in the signer assuming that further calls to update will include message content past what is recoverable.

Parameters
signature:byte[]

the signature that we are in the process of verifying.

verifySignatureback to summary
public boolean verifySignature(byte[] signature)

Implements org.bouncycastle.crypto.internal.Signer.verifySignature.

return true if the signature represents a ISO9796-2 signature for the passed in message.