| Methods Summary |
|---|
| public java.lang.Object | clone()Returns a clone if the implementation is cloneable.
if (this instanceof Cloneable) {
return super.clone();
} else {
throw new CloneNotSupportedException();
}
|
| protected abstract java.lang.Object | engineGetParameter(java.lang.String param)Gets the value of the specified algorithm parameter.
This method supplies a general-purpose mechanism through which it
is possible to get the various parameters of this object. A parameter
may be any settable parameter for the algorithm, such as a parameter
size, or a source of random bits for signature generation (if
appropriate), or an indication of whether or not to perform a
specific but optional computation. A uniform algorithm-specific
naming scheme for each parameter is desirable but left unspecified
at this time.
|
| protected java.security.AlgorithmParameters | engineGetParameters()This method is overridden by providers to return the
parameters used with this signature engine, or null
if this signature engine does not use any parameters.
The returned parameters may be the same that were used to initialize
this signature engine, or may contain a combination of default and
randomly generated parameter values used by the underlying signature
implementation if this signature engine requires algorithm parameters
but was not initialized with any.
throw new UnsupportedOperationException();
|
| protected abstract void | engineInitSign(java.security.PrivateKey privateKey)Initializes this signature object with the specified
private key for signing operations.
|
| protected void | engineInitSign(java.security.PrivateKey privateKey, java.security.SecureRandom random)Initializes this signature object with the specified
private key and source of randomness for signing operations.
This concrete method has been added to this previously-defined
abstract class. (For backwards compatibility, it cannot be abstract.)
this.appRandom = random;
engineInitSign(privateKey);
|
| protected abstract void | engineInitVerify(java.security.PublicKey publicKey)Initializes this signature object with the specified
public key for verification operations.
|
| protected abstract void | engineSetParameter(java.lang.String param, java.lang.Object value)Sets the specified algorithm parameter to the specified
value. This method supplies a general-purpose mechanism through
which it is possible to set the various parameters of this object.
A parameter may be any settable parameter for the algorithm, such as
a parameter size, or a source of random bits for signature generation
(if appropriate), or an indication of whether or not to perform
a specific but optional computation. A uniform algorithm-specific
naming scheme for each parameter is desirable but left unspecified
at this time.
|
| protected void | engineSetParameter(java.security.spec.AlgorithmParameterSpec params)This method is overridden by providers to initialize
this signature engine with the specified parameter set.
throw new UnsupportedOperationException();
|
| protected abstract byte[] | engineSign()Returns the signature bytes of all the data
updated so far.
The format of the signature depends on the underlying
signature scheme.
|
| protected int | engineSign(byte[] outbuf, int offset, int len)Finishes this signature operation and stores the resulting signature
bytes in the provided buffer outbuf, starting at
offset.
The format of the signature depends on the underlying
signature scheme.
The signature implementation is reset to its initial state
(the state it was in after a call to one of the
engineInitSign methods)
and can be reused to generate further signatures with the same private
key.
This method should be abstract, but we leave it concrete for
binary compatibility. Knowledgeable providers should override this
method.
byte[] sig = engineSign();
if (len < sig.length) {
throw new SignatureException
("partial signatures not returned");
}
if (outbuf.length - offset < sig.length) {
throw new SignatureException
("insufficient space in the output buffer to store the "
+ "signature");
}
System.arraycopy(sig, 0, outbuf, offset, sig.length);
return sig.length;
|
| protected abstract void | engineUpdate(byte b)Updates the data to be signed or verified
using the specified byte.
|
| protected abstract void | engineUpdate(byte[] b, int off, int len)Updates the data to be signed or verified, using the
specified array of bytes, starting at the specified offset.
|
| protected void | engineUpdate(java.nio.ByteBuffer input)Updates the data to be signed or verified using the specified
ByteBuffer. Processes the data.remaining() bytes
starting at at data.position().
Upon return, the buffer's position will be equal to its limit;
its limit will not have changed.
if (input.hasRemaining() == false) {
return;
}
try {
if (input.hasArray()) {
byte[] b = input.array();
int ofs = input.arrayOffset();
int pos = input.position();
int lim = input.limit();
engineUpdate(b, ofs + pos, lim - pos);
input.position(lim);
} else {
int len = input.remaining();
byte[] b = new byte[JCAUtil.getTempArraySize(len)];
while (len > 0) {
int chunk = Math.min(len, b.length);
input.get(b, 0, chunk);
engineUpdate(b, 0, chunk);
len -= chunk;
}
}
} catch (SignatureException e) {
// is specified to only occur when the engine is not initialized
// this case should never occur as it is caught in Signature.java
throw new ProviderException("update() failed", e);
}
|
| protected boolean | engineVerify(byte[] sigBytes, int offset, int length)Verifies the passed-in signature in the specified array
of bytes, starting at the specified offset.
Note: Subclasses should overwrite the default implementation.
byte[] sigBytesCopy = new byte[length];
System.arraycopy(sigBytes, offset, sigBytesCopy, 0, length);
return engineVerify(sigBytesCopy);
|
| protected abstract boolean | engineVerify(byte[] sigBytes)Verifies the passed-in signature.
|
