public class X931Signer extends java.lang.Object implements Signer
The message digest hash, H, is encapsulated to form a byte string as follows
EB = 06 || PS || 0xBA || H || TRAILERwhere PS is a string of bytes all of value 0xBB of length such that |EB|=|n|, and TRAILER is the ISO/IEC 10118 part number†for the digest. The byte string, EB, is converted to an integer value, the message representative, f.
| Constructor and Description |
|---|
X931Signer(AsymmetricBlockCipher cipher,
Digest digest)
Constructor for a signer with an explicit digest trailer.
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X931Signer(AsymmetricBlockCipher cipher,
Digest digest,
boolean implicit)
Generate a signer with either implicit or explicit trailers for X9.31
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| Modifier and Type | Method and Description |
|---|---|
byte[] |
generateSignature()
generate a signature for the loaded message 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
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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 signature represents a X9.31 signature
for the passed in message.
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public X931Signer(AsymmetricBlockCipher cipher, Digest digest, boolean implicit)
cipher - base cipher to use for signature creation/verificationdigest - digest to use.implicit - whether or not the trailer is implicit or gives the hash.public X931Signer(AsymmetricBlockCipher cipher, Digest digest)
cipher - cipher to use.digest - digest to sign with.public void init(boolean forSigning,
CipherParameters param)
Signerpublic void update(byte b)
public void update(byte[] in,
int off,
int len)
public byte[] generateSignature()
throws CryptoException
generateSignature in interface SignerCryptoExceptionpublic boolean verifySignature(byte[] signature)
verifySignature in interface Signer