com.ibm.crypto.provider
Class SHA1withDSA

java.lang.Object
  java.security.SignatureSpi
      java.security.Signature
          com.ibm.crypto.provider.SHA1withDSA

public class SHA1withDSA

extends Signature

Field Summary

Fields inherited from class java.security.Signature

SIGN, UNINITIALIZED, VERIFY

Fields inherited from class java.security.SignatureSpi

appRandom

Constructor Summary

SHA1withDSA()
Constructs a new instance of this class.

Method Summary

protected Object	engineGetParameter(String param) Deprecated.
protected void	engineInitSign(PrivateKey privateKey) Initialize the receiver with the specified private key, to be used for signing purposes.
protected void	engineInitVerify(PublicKey publicKey) Initialize the receiver with the specified public key, to be used for verification purposes.
protected void	engineSetParameter(String param, Object value) Deprecated. Replaced with engineSetParameter(AlgorithmParameterSpec)
protected byte[]	engineSign() Answers the signature bytes of the data updated so far.
protected void	engineUpdate(byte b) Update the bytes signed so far with the extra byte provided.
protected void	engineUpdate(byte[] buffer, int offset, int length) Update the bytes signed so far with the extra bytes provided.
protected boolean	engineVerify(byte[] sigBytes) Verifies the passed signature.
String	toString() Answers a string containing a concise, human-readable description of the receiver.

Methods inherited from class java.security.Signature

clone, getAlgorithm, getInstance, getInstance, getInstance, getParameter, getParameters, getProvider, initSign, initSign, initVerify, initVerify, setParameter, setParameter, sign, sign, update, update, update, verify, verify

Methods inherited from class java.security.SignatureSpi

engineGetParameters, engineInitSign, engineSetParameter, engineSign, engineVerify

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

SHA1withDSA

public SHA1withDSA()
            throws NoSuchAlgorithmException,
                   NoSuchProviderException

Constructs a new instance of this class.

Method Detail

engineGetParameter

protected Object engineGetParameter(String param)
                             throws InvalidParameterException

Deprecated.

Answers the specified algorithm parameter. Since no parameters can be specified, it always throws an exception.

Parameters:

param - String the parameter name.

Returns:

the specified algorithm parameter.

Throws:

InvalidParameterException - if the specified parameter name is invalid

engineInitSign

protected void engineInitSign(PrivateKey privateKey)
                       throws InvalidKeyException

Initialize the receiver with the specified private key, to be used for signing purposes.

Parameters:

privateKey - PrivateKey the key to be used when signing

Throws:

InvalidKeyException - if the specified key is not valid (improperly encoded, parameters missing, etc)

engineInitVerify

protected void engineInitVerify(PublicKey publicKey)
                         throws InvalidKeyException

Initialize the receiver with the specified public key, to be used for verification purposes.

Parameters:

publicKey - PublicKey the key to be used when verifying

Throws:

InvalidKeyException - if the specified key is not valid (improperly encoded, parameters missing, etc)

engineSetParameter

protected void engineSetParameter(String param,
                                  Object value)
                           throws InvalidParameterException

Deprecated. Replaced with engineSetParameter(AlgorithmParameterSpec)

Initializes the receiver with the given parameter set.

Parameters:

param - String the parameter name

value - Object the parameter value

Throws:

InvalidParameterException - if the specified parameter name is not valid for the receiver or if it has been set already

engineSign

protected byte[] engineSign()
                     throws SignatureException

Answers the signature bytes of the data updated so far.

Returns:

the signature bytes of the data updated so far.

Throws:

SignatureException - if the engine is not initialized properly

engineUpdate

protected void engineUpdate(byte b)
                     throws SignatureException

Update the bytes signed so far with the extra byte provided.

Parameters:

b - byte the extra byte to be signed.

Throws:

SignatureException - if the receiver is not initialized properly

engineUpdate

protected void engineUpdate(byte[] buffer,
                            int offset,
                            int length)
                     throws SignatureException

Update the bytes signed so far with the extra bytes provided.

Parameters:

buffer - byte[] the extra bytes to be signed.

offset - int offset in the buffer where to start getting bytes for signing

length - int how many bytes to get for signing

Throws:

SignatureException - if the receiver is not initialized properly

engineVerify

protected boolean engineVerify(byte[] sigBytes)
                        throws SignatureException

Verifies the passed signature.

Parameters:

sigBytes - byte[] the signature bytes to verify

Returns:

true if the signature was verified successfully, false otherwise.

Throws:

SignatureException - if the receiver is not initialized properly or if the key is not encoded properly.

toString

public String toString()

Answers a string containing a concise, human-readable description of the receiver.

Returns:

a printable representation for the receiver.