com.ibm.xml.crypto.spi
Interface SignatureEngine

All Known Implementing Classes:

SignatureEngineDSA, SignatureEngineECDSA, SignatureEngineGSSMIC, SignatureEngineHMAC, SignatureEngineRSA

public interface SignatureEngine

This defines an interface to sign or verify signature values of XML-Signature.

Our XML-Signature processor uses an instance as follows:

1. The XML-Signature processor calls EngineFactory.getSignatureEngine(), which instanciates an instance of SignatureEngine
2. Calls setParameter()
3. Calls initSign() (or initVerify())
4. Calls update() repeatedly
5. Calls sign() (or verify())
6. The instance is passed to EngineFactory.releaseSignatureEngine()

An EngineFactory implementation may recycle instances of SignatureEngine. In that case, the EngineFactory.getSignatureEngine() does not instanciate SignatureEngine, but returns existing instance which is passed by releaseSignatureEngine().

See Also:

EngineFactory.getSignatureEngine(String), EngineFactory.releaseSignatureEngine(SignatureEngine), Signature, Mac

Method Summary

java.lang.String	getURI() Return the algorithm identifier.
void	initSign(java.security.Key key) Initialize for signing.
void	initVerify(java.security.Key key) Initialize for verification.
void	setParameter(java.security.spec.AlgorithmParameterSpec spec) Set an instance of AlgorithmParameterSpec extracted from the content of<ds:SignatureMethod>.
byte[]	sign() Finish to sign, and return the signature value.
void	update(byte[] data) Add signed/verified data.
void	update(byte[] data, int off, int len) Add signed/verified data using the byte array, starting offset in the array, and the length.
boolean	verify(byte[] signature) Finish to verify, and return the validity against the specified signature value.

Method Detail

setParameter

void setParameter(java.security.spec.AlgorithmParameterSpec spec)
                  throws java.security.InvalidAlgorithmParameterException

Set an instance of AlgorithmParameterSpec extracted from the content of<ds:SignatureMethod>.

Parameters:

spec - algorithm parameter. It may be null

Throws:

java.security.InvalidAlgorithmParameterException

See Also:

EngineFactory.unmarshalParameter(String, org.w3c.dom.Element)

getURI

java.lang.String getURI()

Return the algorithm identifier.

Returns:

Algorithm identifier URI.

initSign

void initSign(java.security.Key key)
              throws java.security.InvalidKeyException

Initialize for signing.

Parameters:

key - Signing key. For asymmetric signature algorithms, it would be an instance of PrivateKey.

Throws:

java.security.InvalidKeyException

See Also:

Signature.initSign(java.security.PrivateKey)

initVerify

void initVerify(java.security.Key key)
                throws java.security.InvalidKeyException

Initialize for verification.

Parameters:

key - Verification key. For asymmetric signature algorithms, it would be an instance of PublicKey.

Throws:

java.security.InvalidKeyException

See Also:

Signature.initVerify(java.security.PublicKey)

update

void update(byte[] data)
            throws java.security.SignatureException

Add signed/verified data. This method must be equivalent to update(data, 0, data.length).

Parameters:

data - data to be signed or verified

Throws:

java.security.SignatureException

See Also:

Signature.update(byte[])

update

void update(byte[] data,
            int off,
            int len)
            throws java.security.SignatureException

Add signed/verified data using the byte array, starting offset in the array, and the length.

Parameters:

data - data to be signed or verified

off - starting offset in the data

len - the length to be processed

Throws:

java.security.SignatureException

See Also:

Signature.update(byte[], int, int)

sign

byte[] sign()
            throws java.security.SignatureException

Finish to sign, and return the signature value.

Returns:

signature value to be inserted to <ds:SignatureValue>

Throws:

java.security.SignatureException

See Also:

Signature.sign()

verify

boolean verify(byte[] signature)
               throws java.security.SignatureException

Finish to verify, and return the validity against the specified signature value.

Parameters:

signature - binary representation of the content of <ds:SignatureValue>

Returns:

true if the signature is matched.

Throws:

java.security.SignatureException

See Also:

Signature.verify(byte[])