0N/A/*
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2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
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0N/A * You should have received a copy of the GNU General Public License version
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0N/A *
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0N/A */
0N/A
0N/Apackage com.sun.crypto.provider;
0N/A
0N/Aimport java.nio.ByteBuffer;
0N/A
0N/Aimport javax.crypto.MacSpi;
0N/Aimport javax.crypto.SecretKey;
0N/Aimport java.security.*;
0N/Aimport java.security.spec.*;
0N/A
0N/A/**
0N/A * This is an implementation of the HMAC-SHA1 algorithm.
0N/A *
0N/A * @author Jan Luehe
0N/A */
0N/Apublic final class HmacSHA1 extends MacSpi implements Cloneable {
0N/A
0N/A private HmacCore hmac = null;
0N/A private static final int SHA1_BLOCK_LENGTH = 64;
0N/A
0N/A /**
0N/A * Standard constructor, creates a new HmacSHA1 instance.
0N/A */
0N/A public HmacSHA1() throws NoSuchAlgorithmException {
0N/A this.hmac = new HmacCore(MessageDigest.getInstance("SHA1"),
0N/A SHA1_BLOCK_LENGTH);
0N/A }
0N/A
0N/A /**
0N/A * Returns the length of the HMAC in bytes.
0N/A *
0N/A * @return the HMAC length in bytes.
0N/A */
0N/A protected int engineGetMacLength() {
0N/A return hmac.getDigestLength();
0N/A }
0N/A
0N/A /**
0N/A * Initializes the HMAC with the given secret key and algorithm parameters.
0N/A *
0N/A * @param key the secret key.
0N/A * @param params the algorithm parameters.
0N/A *
0N/A * @exception InvalidKeyException if the given key is inappropriate for
0N/A * initializing this MAC.
0N/A * @exception InvalidAlgorithmParameterException if the given algorithm
0N/A * parameters are inappropriate for this MAC.
0N/A */
0N/A protected void engineInit(Key key, AlgorithmParameterSpec params)
0N/A throws InvalidKeyException, InvalidAlgorithmParameterException {
0N/A hmac.init(key, params);
0N/A }
0N/A
0N/A /**
0N/A * Processes the given byte.
0N/A *
0N/A * @param input the input byte to be processed.
0N/A */
0N/A protected void engineUpdate(byte input) {
0N/A hmac.update(input);
0N/A }
0N/A
0N/A /**
0N/A * Processes the first <code>len</code> bytes in <code>input</code>,
0N/A * starting at <code>offset</code>.
0N/A *
0N/A * @param input the input buffer.
0N/A * @param offset the offset in <code>input</code> where the input starts.
0N/A * @param len the number of bytes to process.
0N/A */
0N/A protected void engineUpdate(byte input[], int offset, int len) {
0N/A hmac.update(input, offset, len);
0N/A }
0N/A
0N/A protected void engineUpdate(ByteBuffer input) {
0N/A hmac.update(input);
0N/A }
0N/A
0N/A /**
0N/A * Completes the HMAC computation and resets the HMAC for further use,
0N/A * maintaining the secret key that the HMAC was initialized with.
0N/A *
0N/A * @return the HMAC result.
0N/A */
0N/A protected byte[] engineDoFinal() {
0N/A return hmac.doFinal();
0N/A }
0N/A
0N/A /**
0N/A * Resets the HMAC for further use, maintaining the secret key that the
0N/A * HMAC was initialized with.
0N/A */
0N/A protected void engineReset() {
0N/A hmac.reset();
0N/A }
0N/A
0N/A /*
0N/A * Clones this object.
0N/A */
0N/A public Object clone() {
0N/A HmacSHA1 that = null;
0N/A try {
0N/A that = (HmacSHA1)super.clone();
0N/A that.hmac = (HmacCore)this.hmac.clone();
0N/A } catch (CloneNotSupportedException e) {
0N/A }
0N/A return that;
0N/A }
0N/A}