?? dsa.java
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package org.bouncycastle.crypto;import java.math.BigInteger;/** * interface for classes implementing algorithms modeled similar to the Digital Signature Alorithm. */public interface DSA{ /** * initialise the signer for signature generation or signature * verification. * * @param forSigning true if we are generating a signature, false * otherwise. * @param param key parameters for signature generation. */ public void init(boolean forSigning, CipherParameters param); /** * sign the passed in message (usually the output of a hash function). * * @param message the message to be signed. * @return two big integers representing the r and s values respectively. */ public BigInteger[] generateSignature(byte[] message); /** * verify the message message against the signature values r and s. * * @param message the message that was supposed to have been signed. * @param r the r signature value. * @param s the s signature value. */ public boolean verifySignature(byte[] message, BigInteger r, BigInteger s);}
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