All Downloads are FREE. Search and download functionalities are using the official Maven repository.

org.bouncycastle.crypto.tls.SSL3Mac Maven / Gradle / Ivy

Go to download

The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8 with debug enabled.

There is a newer version: 1.70
Show newest version
package org.bouncycastle.crypto.tls;

import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.Mac;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.util.Arrays;

/**
 * HMAC implementation based on original internet draft for HMAC (RFC 2104)
 * 

* The difference is that padding is concatenated versus XORed with the key *

* H(K + opad, H(K + ipad, text)) */ public class SSL3Mac implements Mac { private final static byte IPAD_BYTE = (byte)0x36; private final static byte OPAD_BYTE = (byte)0x5C; static final byte[] IPAD = genPad(IPAD_BYTE, 48); static final byte[] OPAD = genPad(OPAD_BYTE, 48); private Digest digest; private int padLength; private byte[] secret; /** * Base constructor for one of the standard digest algorithms that the byteLength of * the algorithm is know for. Behaviour is undefined for digests other than MD5 or SHA1. * * @param digest the digest. */ public SSL3Mac(Digest digest) { this.digest = digest; if (digest.getDigestSize() == 20) { this.padLength = 40; } else { this.padLength = 48; } } public String getAlgorithmName() { return digest.getAlgorithmName() + "/SSL3MAC"; } public Digest getUnderlyingDigest() { return digest; } public void init(CipherParameters params) { secret = Arrays.clone(((KeyParameter)params).getKey()); reset(); } public int getMacSize() { return digest.getDigestSize(); } public void update(byte in) { digest.update(in); } public void update(byte[] in, int inOff, int len) { digest.update(in, inOff, len); } public int doFinal(byte[] out, int outOff) { byte[] tmp = new byte[digest.getDigestSize()]; digest.doFinal(tmp, 0); digest.update(secret, 0, secret.length); digest.update(OPAD, 0, padLength); digest.update(tmp, 0, tmp.length); int len = digest.doFinal(out, outOff); reset(); return len; } /** * Reset the mac generator. */ public void reset() { digest.reset(); digest.update(secret, 0, secret.length); digest.update(IPAD, 0, padLength); } private static byte[] genPad(byte b, int count) { byte[] padding = new byte[count]; Arrays.fill(padding, b); return padding; } }





© 2015 - 2024 Weber Informatics LLC | Privacy Policy