com.sun.crypto.provider.HmacCore Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of qbicc-rt-java.base Show documentation
Show all versions of qbicc-rt-java.base Show documentation
The Qbicc builder for the java.base JDK module
/*
* Copyright (c) 2002, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.crypto.provider;
import java.util.Arrays;
import java.nio.ByteBuffer;
import javax.crypto.MacSpi;
import javax.crypto.SecretKey;
import java.security.*;
import java.security.spec.*;
import sun.security.x509.AlgorithmId;
/**
* This class constitutes the core of HMAC- algorithms, where
* is the digest algorithm used by HMAC as in RFC 2104
* "HMAC: Keyed-Hashing for Message Authentication".
*
* It also contains implementation classes for:
* - HmacMD5
* - HmacSHA1
* - HMAC with SHA-2 family of digests, i.e. HmacSHA224, HmacSHA256,
* HmacSHA384, HmacSHA512, HmacSHA512/224, HmacSHA512/256, and
* - HMAC with SHA-3 family of digests, i.e. HmacSHA3-224, HmacSHA3-256,
* HmacSHA3-384, HmacSHA3-512
*
* @author Jan Luehe
*/
abstract class HmacCore extends MacSpi implements Cloneable {
private MessageDigest md;
private byte[] k_ipad; // inner padding - key XORd with ipad
private byte[] k_opad; // outer padding - key XORd with opad
private boolean first; // Is this the first data to be processed?
private final int blockLen;
/**
* Standard constructor, creates a new HmacCore instance instantiating
* a MessageDigest of the specified name.
*/
HmacCore(String digestAlgo, int bl) throws NoSuchAlgorithmException {
MessageDigest md = MessageDigest.getInstance(digestAlgo);
if (!(md instanceof Cloneable)) {
// use SUN provider if the most preferred one does not support
// cloning
Provider sun = Security.getProvider("SUN");
if (sun != null) {
md = MessageDigest.getInstance(digestAlgo, sun);
} else {
String noCloneProv = md.getProvider().getName();
// if no Sun provider, use provider list
md = null;
Provider[] provs = Security.getProviders();
for (Provider p : provs) {
try {
if (!p.getName().equals(noCloneProv)) {
MessageDigest md2 =
MessageDigest.getInstance(digestAlgo, p);
if (md2 instanceof Cloneable) {
md = md2;
break;
}
}
} catch (NoSuchAlgorithmException nsae) {
continue;
}
}
if (md == null) {
throw new NoSuchAlgorithmException
("No Cloneable digest found for " + digestAlgo);
}
}
}
this.md = md;
this.blockLen = bl;
this.k_ipad = new byte[blockLen];
this.k_opad = new byte[blockLen];
first = true;
}
/**
* Returns the length of the HMAC in bytes.
*
* @return the HMAC length in bytes.
*/
protected int engineGetMacLength() {
return this.md.getDigestLength();
}
/**
* Initializes the HMAC with the given secret key and algorithm parameters.
*
* @param key the secret key.
* @param params the algorithm parameters.
*
* @exception InvalidKeyException if the given key is inappropriate for
* initializing this MAC.
* @exception InvalidAlgorithmParameterException if the given algorithm
* parameters are inappropriate for this MAC.
*/
protected void engineInit(Key key, AlgorithmParameterSpec params)
throws InvalidKeyException, InvalidAlgorithmParameterException {
if (params != null) {
throw new InvalidAlgorithmParameterException
("HMAC does not use parameters");
}
if (!(key instanceof SecretKey)) {
throw new InvalidKeyException("Secret key expected");
}
byte[] secret = key.getEncoded();
if (secret == null) {
throw new InvalidKeyException("Missing key data");
}
// if key is longer than the block length, reset it using
// the message digest object.
if (secret.length > blockLen) {
byte[] tmp = md.digest(secret);
// now erase the secret
Arrays.fill(secret, (byte)0);
secret = tmp;
}
// XOR k with ipad and opad, respectively
for (int i = 0; i < blockLen; i++) {
int si = (i < secret.length) ? secret[i] : 0;
k_ipad[i] = (byte)(si ^ 0x36);
k_opad[i] = (byte)(si ^ 0x5c);
}
// now erase the secret
Arrays.fill(secret, (byte)0);
secret = null;
engineReset();
}
/**
* Processes the given byte.
*
* @param input the input byte to be processed.
*/
protected void engineUpdate(byte input) {
if (first == true) {
// compute digest for 1st pass; start with inner pad
md.update(k_ipad);
first = false;
}
// add the passed byte to the inner digest
md.update(input);
}
/**
* Processes the first len bytes in input,
* starting at offset.
*
* @param input the input buffer.
* @param offset the offset in input where the input starts.
* @param len the number of bytes to process.
*/
protected void engineUpdate(byte input[], int offset, int len) {
if (first == true) {
// compute digest for 1st pass; start with inner pad
md.update(k_ipad);
first = false;
}
// add the selected part of an array of bytes to the inner digest
md.update(input, offset, len);
}
/**
* Processes the input.remaining() bytes in the ByteBuffer
* input.
*
* @param input the input byte buffer.
*/
protected void engineUpdate(ByteBuffer input) {
if (first == true) {
// compute digest for 1st pass; start with inner pad
md.update(k_ipad);
first = false;
}
md.update(input);
}
/**
* Completes the HMAC computation and resets the HMAC for further use,
* maintaining the secret key that the HMAC was initialized with.
*
* @return the HMAC result.
*/
protected byte[] engineDoFinal() {
if (first == true) {
// compute digest for 1st pass; start with inner pad
md.update(k_ipad);
} else {
first = true;
}
try {
// finish the inner digest
byte[] tmp = md.digest();
// compute digest for 2nd pass; start with outer pad
md.update(k_opad);
// add result of 1st hash
md.update(tmp);
md.digest(tmp, 0, tmp.length);
return tmp;
} catch (DigestException e) {
// should never occur
throw new ProviderException(e);
}
}
/**
* Resets the HMAC for further use, maintaining the secret key that the
* HMAC was initialized with.
*/
protected void engineReset() {
if (first == false) {
md.reset();
first = true;
}
}
/*
* Clones this object.
*/
public Object clone() throws CloneNotSupportedException {
HmacCore copy = (HmacCore) super.clone();
copy.md = (MessageDigest) md.clone();
copy.k_ipad = k_ipad.clone();
copy.k_opad = k_opad.clone();
return copy;
}
// nested static class for the HmacSHA224 implementation
public static final class HmacSHA224 extends HmacCore {
public HmacSHA224() throws NoSuchAlgorithmException {
super("SHA-224", 64);
}
}
// nested static class for the HmacSHA256 implementation
public static final class HmacSHA256 extends HmacCore {
public HmacSHA256() throws NoSuchAlgorithmException {
super("SHA-256", 64);
}
}
// nested static class for the HmacSHA384 implementation
public static final class HmacSHA384 extends HmacCore {
public HmacSHA384() throws NoSuchAlgorithmException {
super("SHA-384", 128);
}
}
// nested static class for the HmacSHA512 implementation
public static final class HmacSHA512 extends HmacCore {
public HmacSHA512() throws NoSuchAlgorithmException {
super("SHA-512", 128);
}
}
// nested static class for the HmacSHA512/224 implementation
public static final class HmacSHA512_224 extends HmacCore {
public HmacSHA512_224() throws NoSuchAlgorithmException {
super("SHA-512/224", 128);
}
}
// nested static class for the HmacSHA512/256 implementation
public static final class HmacSHA512_256 extends HmacCore {
public HmacSHA512_256() throws NoSuchAlgorithmException {
super("SHA-512/256", 128);
}
}
// nested static class for the HmacSHA3-224 implementation
public static final class HmacSHA3_224 extends HmacCore {
public HmacSHA3_224() throws NoSuchAlgorithmException {
super("SHA3-224", 144);
}
}
// nested static class for the HmacSHA3-256 implementation
public static final class HmacSHA3_256 extends HmacCore {
public HmacSHA3_256() throws NoSuchAlgorithmException {
super("SHA3-256", 136);
}
}
// nested static class for the HmacSHA3-384 implementation
public static final class HmacSHA3_384 extends HmacCore {
public HmacSHA3_384() throws NoSuchAlgorithmException {
super("SHA3-384", 104);
}
}
// nested static class for the HmacSHA3-512 implementation
public static final class HmacSHA3_512 extends HmacCore {
public HmacSHA3_512() throws NoSuchAlgorithmException {
super("SHA3-512", 72);
}
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy