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java.lang.Object org.bouncycastle.crypto.signers.PSSSigner
public class PSSSigner
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 | |
---|---|
private byte[] |
block
|
private AsymmetricBlockCipher |
cipher
|
private Digest |
digest
|
private int |
emBits
|
private int |
hLen
|
private byte[] |
mDash
|
private java.security.SecureRandom |
random
|
private byte[] |
salt
|
private int |
sLen
|
private byte |
trailer
|
static byte |
TRAILER_IMPLICIT
|
Constructor Summary | |
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PSSSigner(AsymmetricBlockCipher cipher,
Digest digest,
int sLen)
basic constructor |
|
PSSSigner(AsymmetricBlockCipher cipher,
Digest digest,
int sLen,
byte trailer)
|
Method Summary | |
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private void |
clearBlock(byte[] block)
clear possible sensitive data |
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. |
private void |
ItoOSP(int i,
byte[] sp)
int to octet string. |
private byte[] |
maskGeneratorFunction1(byte[] Z,
int zOff,
int zLen,
int length)
mask generator function, as described in PKCS1v2. |
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 |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final byte TRAILER_IMPLICIT
private Digest digest
private AsymmetricBlockCipher cipher
private java.security.SecureRandom random
private int hLen
private int sLen
private int emBits
private byte[] salt
private byte[] mDash
private byte[] block
private byte trailer
Constructor Detail |
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public PSSSigner(AsymmetricBlockCipher cipher, Digest digest, int sLen)
cipher
- the assymetric cipher to use.digest
- the digest to use.sLen
- the length of the salt to use (in bytes).public PSSSigner(AsymmetricBlockCipher cipher, Digest digest, int sLen, byte trailer)
Method Detail |
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public void init(boolean forSigning, CipherParameters param)
Signer
init
in interface Signer
forSigning
- true if for signing, false otherwiseparam
- necessary parameters.private void clearBlock(byte[] block)
public void update(byte b)
update
in interface Signer
public void update(byte[] in, int off, int len)
update
in interface Signer
public void reset()
reset
in interface Signer
public byte[] generateSignature() throws CryptoException, DataLengthException
generateSignature
in interface Signer
CryptoException
DataLengthException
public boolean verifySignature(byte[] signature)
verifySignature
in interface Signer
private void ItoOSP(int i, byte[] sp)
private byte[] maskGeneratorFunction1(byte[] Z, int zOff, int zLen, int length)
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