SignatureSpi JDK 1.6)

public Object clone () throws CloneNotSupportedException

Returns a clone if the implementation is cloneable.

Returns a clone if the implementation is cloneable.
Returns: a clone if the implementation is cloneable.
Throws:
- CloneNotSupportedException - if this is called on an implementation that does not support Cloneable.

@Deprecated

protectedabstract Object ~~engineGetParameter~~ (String param) throws InvalidParameterException

Gets the value of the specified algorithm parameter.

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.
Returns: the object that represents the parameter value, or null if there is none.
Parameters:
- param - the string name of the parameter.
Throws:
- InvalidParameterException - if param is an invalid parameter for this engine, or another exception occurs while trying to get this parameter.

protected 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.

protectedabstract void engineInitSign (PrivateKey privateKey) throws InvalidKeyException

Initializes this signature object with the specified private key for signing operations.

protected void engineInitSign (PrivateKey privateKey, SecureRandom random) throws InvalidKeyException

Initializes this signature object with the specified private key and source of randomness for signing operations.

protectedabstract void engineInitVerify (PublicKey publicKey) throws InvalidKeyException

Initializes this signature object with the specified public key for verification operations.

protected void engineSetParameter (AlgorithmParameterSpec params) throws InvalidAlgorithmParameterException

This method is overridden by providers to initialize this signature engine with the specified parameter set.

@Deprecated

protectedabstract void ~~engineSetParameter~~ (String param, Object value) throws InvalidParameterException

Sets the specified algorithm parameter to the specified 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.
Parameters:
- param - the string identifier of the parameter.
- value - the parameter value.
Throws:
- InvalidParameterException - if param is an invalid parameter for this signature algorithm engine, the parameter is already set and cannot be set again, a security exception occurs, and so on.

protectedabstract byte engineSign () throws SignatureException

Returns the signature bytes of all the data updated so far.

protected int engineSign (byte[] outbuf, int offset, int len) throws SignatureException

Finishes this signature operation and stores the resulting signature bytes in the provided buffer outbuf, starting at offset.

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.
Returns: the number of bytes placed into outbuf
Parameters:
- outbuf - buffer for the signature result.
- offset - offset into outbuf where the signature is stored.
- len - number of bytes within outbuf allotted for the signature. Both this default implementation and the SUN provider do not return partial digests. If the value of this parameter is less than the actual signature length, this method will throw a SignatureException. This parameter is ignored if its value is greater than or equal to the actual signature length.
Throws:
- SignatureException - if the engine is not initialized properly, if this signature algorithm is unable to process the input data provided, or if len is less than the actual signature length.
Since: 1.2

protectedabstract void engineUpdate (byte b) throws SignatureException

Updates the data to be signed or verified using the specified byte.

protectedabstract void engineUpdate (byte[] b, int off, int len) throws SignatureException

Updates the data to be signed or verified, using the specified array of bytes, starting at the specified offset.

protected void engineUpdate (ByteBuffer input)

Updates the data to be signed or verified using the specified ByteBuffer.

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.
Parameters:
- input - the ByteBuffer
Since: 1.5

protectedabstract boolean engineVerify (byte[] sigBytes) throws SignatureException

Verifies the passed-in signature.

protected boolean engineVerify (byte[] sigBytes, int offset, int length) throws SignatureException

Verifies the passed-in signature in the specified array of bytes, starting at the specified offset.