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view src/ch/ethz/ssh2/crypto/digest/HMAC.java @ 395:74d527fe7f5f stable-1.9.0.6
bump version number
author | Carl Byington <carl@five-ten-sg.com> |
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date | Fri, 19 Sep 2014 12:29:30 -0700 |
parents | 071eccdff8ea |
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/* * Copyright (c) 2006-2011 Christian Plattner. All rights reserved. * Please refer to the LICENSE.txt for licensing details. */ package ch.ethz.ssh2.crypto.digest; import java.security.DigestException; /** * HMAC. * * @author Christian Plattner * @version 2.50, 03/15/10 */ public final class HMAC implements Digest { Digest md; byte[] k_xor_ipad; byte[] k_xor_opad; byte[] tmp; int size; public HMAC(Digest md, byte[] key, int size) throws DigestException { this.md = md; this.size = size; tmp = new byte[md.getDigestLength()]; final int BLOCKSIZE = 64; k_xor_ipad = new byte[BLOCKSIZE]; k_xor_opad = new byte[BLOCKSIZE]; if (key.length > BLOCKSIZE) { md.reset(); md.update(key); md.digest(tmp); key = tmp; } System.arraycopy(key, 0, k_xor_ipad, 0, key.length); System.arraycopy(key, 0, k_xor_opad, 0, key.length); for (int i = 0; i < BLOCKSIZE; i++) { k_xor_ipad[i] ^= 0x36; k_xor_opad[i] ^= 0x5C; } md.update(k_xor_ipad); } public final int getDigestLength() { return size; } public final void update(byte b) { md.update(b); } public final void update(byte[] b) { md.update(b); } public final void update(byte[] b, int off, int len) { md.update(b, off, len); } public final void reset() { md.reset(); md.update(k_xor_ipad); } public final void digest(byte[] out) throws DigestException { digest(out, 0); } public final void digest(byte[] out, int off) throws DigestException { md.digest(tmp); md.update(k_xor_opad); md.update(tmp); md.digest(tmp); System.arraycopy(tmp, 0, out, off, size); md.update(k_xor_ipad); } }