Package org.apache.harmony.security.provider.crypto

Class SHA1withDSA_SignatureImpl

java.lang.Object

java.security.SignatureSpi

java.security.Signature

org.apache.harmony.security.provider.crypto.SHA1withDSA_SignatureImpl

public class SHA1withDSA_SignatureImpl
extends Signature

Field Summary

Fields inherited from class java.security.Signature

SIGN, state, UNINITIALIZED, VERIFY

Fields inherited from class java.security.SignatureSpi

appRandom

Constructor Summary

Constructors

Constructor	Description
SHA1withDSA_SignatureImpl()	The solo constructor.

Method Summary

Modifier and Type	Method	Description
protected Object	engineGetParameter(String param)	Deprecated method.
protected void	engineInitSign(PrivateKey privateKey)	Initializes this signature object with PrivateKey object passed as argument to the method.
protected void	engineInitVerify(PublicKey publicKey)	Initializes this signature object with PublicKey object passed as argument to the method.
protected void	engineSetParameter(String param, Object value)	Sets the specified parameter to the given value.
protected byte[]	engineSign()	Returns signature bytes as byte array containing ASN1 representation for two BigInteger objects which is SEQUENCE of two INTEGERS.
protected void	engineUpdate(byte b)	Updates data to sign or to verify.
protected void	engineUpdate(byte[] b, int off, int len)	Updates data to sign or to verify.
protected boolean	engineVerify(byte[] sigBytes)	Verifies the signature bytes.
protected boolean	engineVerify(byte[] sigBytes, int offset, int length)	Verifies the signature bytes.

Methods inherited from class java.security.Signature

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

Methods inherited from class java.security.SignatureSpi

engineGetParameters, engineInitSign, engineSetParameter, engineSign, engineUpdate

Methods inherited from class java.lang.Object

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

Constructor Details

SHA1withDSA_SignatureImpl

public SHA1withDSA_SignatureImpl()
                          throws NoSuchAlgorithmException

The solo constructor.

Throws:

NoSuchAlgorithmException

Method Details

engineGetParameter

protected Object engineGetParameter(String param)
                             throws InvalidParameterException

Deprecated method.

Specified by:

engineGetParameter in class SignatureSpi

Parameters:

param - the name of the requested parameter value.

Returns:

null

Throws:

InvalidParameterException - if param is not a valid parameter for this SignatureSpi or an other error occurs.

engineInitSign

protected void engineInitSign(PrivateKey privateKey)
                       throws InvalidKeyException

Initializes this signature object with PrivateKey object passed as argument to the method.

Specified by:

engineInitSign in class SignatureSpi

Parameters:

privateKey - the private key.

Throws:

InvalidKeyException - if privateKey is not DSAPrivateKey object

engineInitVerify

protected void engineInitVerify(PublicKey publicKey)
                         throws InvalidKeyException

Initializes this signature object with PublicKey object passed as argument to the method.

Specified by:

engineInitVerify in class SignatureSpi

Parameters:

publicKey - the public key.

Throws:

InvalidKeyException - if publicKey is not DSAPublicKey object

engineSetParameter

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

Description copied from class: SignatureSpi

Sets the specified parameter to the given value.

Specified by:

engineSetParameter in class SignatureSpi

Parameters:

param - the name of the parameter.

value - the parameter value.

Throws:

InvalidParameterException - if the parameter is invalid, already set or is not allowed to be changed.

engineSign

protected byte[] engineSign()
                     throws SignatureException

Returns signature bytes as byte array containing ASN1 representation for two BigInteger objects which is SEQUENCE of two INTEGERS. Length of sequence varies from less than 46 to 48. Resets object to the state it was in when previous call to either "initSign" method was called.

Specified by:

engineSign in class SignatureSpi

Returns:

byte array containing signature in ASN1 representation

Throws:

SignatureException - if object's state is not SIGN or signature algorithm cannot process data

engineUpdate

protected void engineUpdate(byte b)
                     throws SignatureException

Updates data to sign or to verify.

Specified by:

engineUpdate in class SignatureSpi

Parameters:

b - the byte to update with.

Throws:

SignatureException - if object was not initialized for signing or verifying

engineUpdate

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

Updates data to sign or to verify.

Specified by:

engineUpdate in class SignatureSpi

Parameters:

b - the byte array to update with.

off - the start index in b of the data.

len - the number of bytes to use.

Throws:

SignatureException - if object was not initialized for signing or verifying

engineVerify

protected boolean engineVerify(byte[] sigBytes)
                        throws SignatureException

Verifies the signature bytes.

Specified by:

engineVerify in class SignatureSpi

Parameters:

sigBytes - the signature to verify.

Returns:

true if signature bytes were verified, false otherwise

Throws:

SignatureException - if object's state is not VERIFY or signature format is not ASN1 representation or signature algorithm cannot process data

engineVerify

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

Verifies the signature bytes.

Overrides:

engineVerify in class SignatureSpi

Parameters:

sigBytes - the byte[] containing the signature to verify.

offset - the start index in sigBytes of the signature

length - the number of bytes allocated for the signature.

Returns:

true if signature bytes were verified, false otherwise

Throws:

SignatureException - if object's state is not VERIFY or signature format is not ASN1 representation or signature algorithm cannot process data