iaik.security.dsa

Class SHA256withDSA

java.lang.Object

java.security.SignatureSpi

iaik.security.dsa.DSA

iaik.security.dsa.SHA256withDSA

public class SHA256withDSA
extends DSA

Signature engine for the DSA signature algorithm using SHA256 as hash algorithm as specified by FIPS 186-3.

For signing some data call the Signature getInstance, initSign, update and sign methods, respectively, e.g.:

 byte[] message = ...;
 Signature dsa = Signature.getInstance("SHA256withDSA", "IAIK");
 PrivateKey privateKey = ...;   
 // init Signature object with private key
 dsa.initSign(privateKey);
 // supply the data to be signed by as many update calls as necessary
 dsa.update(message); 
 // create the signature
 byte[] dsasig = dsa.sign();
 

For verifying a signature call the Signature getInstance, initVerify, update and verify methods, respectively, e.g.: byte[] message = ...; Signature dsa = Signature.getInstance("SHA256withDSA", "IAIK"); PublicKey publicKey = ...; // init Signature object with public key dsa.initVerify(publicKey); // supply the data that has been signed by as many update calls as necessary dsa.update(message); // verify the signature if (dsa.verify(dsasig) == false){ throw new SignatureException("Signature invalid."); }

Field Summary

Fields inherited from class java.security.SignatureSpi

appRandom

Constructor Summary

Constructors

Constructor and Description
SHA256withDSA() Default constructor.

Method Summary

Methods inherited from class iaik.security.dsa.DSA

engineGetParameter, engineGetParameters, engineInitSign, engineInitSign, engineInitVerify, engineSetParameter, engineSetParameter, engineSign, engineUpdate, engineUpdate, engineVerify, setCheckSigValueForDERCompliance, setDoVerifySignature, setUseBachwardsCompatibilityMode, setUseBlinding

Methods inherited from class java.security.SignatureSpi

clone, engineSign, engineUpdate, engineVerify

Methods inherited from class java.lang.Object

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

Constructor Detail

SHA256withDSA

public SHA256withDSA()
              throws java.security.NoSuchAlgorithmException

Default constructor. Applications should not use this constructor, but the Signature.getInstance("SHA256withDSA") method.

Throws:

java.security.NoSuchAlgorithmException - if the SHA256 MessageDigest algorithm is not available