Signer
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.
Modifier and Type | Field | Description |
---|---|---|
static int |
TRAILER_IMPLICIT |
Deprecated.
use ISOTrailers
|
static int |
TRAILER_RIPEMD128 |
Deprecated.
use ISOTrailers
|
static int |
TRAILER_RIPEMD160 |
Deprecated.
use ISOTrailers
|
static int |
TRAILER_SHA1 |
Deprecated.
use ISOTrailers
|
static int |
TRAILER_SHA224 |
Deprecated.
use ISOTrailers
|
static int |
TRAILER_SHA256 |
Deprecated.
use ISOTrailers
|
static int |
TRAILER_SHA384 |
Deprecated.
use ISOTrailers
|
static int |
TRAILER_SHA512 |
Deprecated.
use ISOTrailers
|
static int |
TRAILER_WHIRLPOOL |
Deprecated.
use ISOTrailers
|
Constructor | Description |
---|---|
X931Signer(AsymmetricBlockCipher cipher,
Digest digest) |
Constructor for a signer with an explicit digest trailer.
|
X931Signer(AsymmetricBlockCipher cipher,
Digest digest,
boolean implicit) |
Generate a signer with either implicit or explicit trailers for X9.31
|
Modifier and Type | Method | 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
|
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.
|
public static final int TRAILER_IMPLICIT
public static final int TRAILER_RIPEMD160
public static final int TRAILER_RIPEMD128
public static final int TRAILER_SHA1
public static final int TRAILER_SHA256
public static final int TRAILER_SHA512
public static final int TRAILER_SHA384
public static final int TRAILER_WHIRLPOOL
public static final int TRAILER_SHA224
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)
Signer
public void update(byte b)
public void update(byte[] in, int off, int len)
public byte[] generateSignature() throws CryptoException
generateSignature
in interface Signer
CryptoException
public boolean verifySignature(byte[] signature)
verifySignature
in interface Signer