| /* |
| * Copyright (c) 2002, 2006, 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 sun.security.provider; |
| |
| import static sun.security.provider.ByteArrayAccess.*; |
| |
| /** |
| * This class implements the Secure Hash Algorithm SHA-256 developed by |
| * the National Institute of Standards and Technology along with the |
| * National Security Agency. |
| * |
| * <p>It implements java.security.MessageDigestSpi, and can be used |
| * through Java Cryptography Architecture (JCA), as a pluggable |
| * MessageDigest implementation. |
| * |
| * @since 1.4.2 |
| * @author Valerie Peng |
| * @author Andreas Sterbenz |
| */ |
| public final class SHA2 extends DigestBase { |
| |
| private static final int ITERATION = 64; |
| // Constants for each round |
| private static final int[] ROUND_CONSTS = { |
| 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, |
| 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, |
| 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, |
| 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, |
| 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, |
| 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, |
| 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, |
| 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, |
| 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, |
| 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, |
| 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, |
| 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, |
| 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, |
| 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, |
| 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, |
| 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 |
| }; |
| |
| // buffer used by implCompress() |
| private final int[] W; |
| |
| // state of this object |
| private final int[] state; |
| |
| /** |
| * Creates a new SHA object. |
| */ |
| public SHA2() { |
| super("SHA-256", 32, 64); |
| state = new int[8]; |
| W = new int[64]; |
| implReset(); |
| } |
| |
| /** |
| * Creates a SHA2 object.with state (for cloning) |
| */ |
| private SHA2(SHA2 base) { |
| super(base); |
| this.state = base.state.clone(); |
| this.W = new int[64]; |
| } |
| |
| public Object clone() { |
| return new SHA2(this); |
| } |
| |
| /** |
| * Resets the buffers and hash value to start a new hash. |
| */ |
| void implReset() { |
| state[0] = 0x6a09e667; |
| state[1] = 0xbb67ae85; |
| state[2] = 0x3c6ef372; |
| state[3] = 0xa54ff53a; |
| state[4] = 0x510e527f; |
| state[5] = 0x9b05688c; |
| state[6] = 0x1f83d9ab; |
| state[7] = 0x5be0cd19; |
| } |
| |
| void implDigest(byte[] out, int ofs) { |
| long bitsProcessed = bytesProcessed << 3; |
| |
| int index = (int)bytesProcessed & 0x3f; |
| int padLen = (index < 56) ? (56 - index) : (120 - index); |
| engineUpdate(padding, 0, padLen); |
| |
| i2bBig4((int)(bitsProcessed >>> 32), buffer, 56); |
| i2bBig4((int)bitsProcessed, buffer, 60); |
| implCompress(buffer, 0); |
| |
| i2bBig(state, 0, out, ofs, 32); |
| } |
| |
| /** |
| * logical function ch(x,y,z) as defined in spec: |
| * @return (x and y) xor ((complement x) and z) |
| * @param x int |
| * @param y int |
| * @param z int |
| */ |
| private static int lf_ch(int x, int y, int z) { |
| return (x & y) ^ ((~x) & z); |
| } |
| |
| /** |
| * logical function maj(x,y,z) as defined in spec: |
| * @return (x and y) xor (x and z) xor (y and z) |
| * @param x int |
| * @param y int |
| * @param z int |
| */ |
| private static int lf_maj(int x, int y, int z) { |
| return (x & y) ^ (x & z) ^ (y & z); |
| } |
| |
| /** |
| * logical function R(x,s) - right shift |
| * @return x right shift for s times |
| * @param x int |
| * @param s int |
| */ |
| private static int lf_R( int x, int s ) { |
| return (x >>> s); |
| } |
| |
| /** |
| * logical function S(x,s) - right rotation |
| * @return x circular right shift for s times |
| * @param x int |
| * @param s int |
| */ |
| private static int lf_S(int x, int s) { |
| return (x >>> s) | (x << (32 - s)); |
| } |
| |
| /** |
| * logical function sigma0(x) - xor of results of right rotations |
| * @return S(x,2) xor S(x,13) xor S(x,22) |
| * @param x int |
| */ |
| private static int lf_sigma0(int x) { |
| return lf_S(x, 2) ^ lf_S(x, 13) ^ lf_S(x, 22); |
| } |
| |
| /** |
| * logical function sigma1(x) - xor of results of right rotations |
| * @return S(x,6) xor S(x,11) xor S(x,25) |
| * @param x int |
| */ |
| private static int lf_sigma1(int x) { |
| return lf_S( x, 6 ) ^ lf_S( x, 11 ) ^ lf_S( x, 25 ); |
| } |
| |
| /** |
| * logical function delta0(x) - xor of results of right shifts/rotations |
| * @return int |
| * @param x int |
| */ |
| private static int lf_delta0(int x) { |
| return lf_S(x, 7) ^ lf_S(x, 18) ^ lf_R(x, 3); |
| } |
| |
| /** |
| * logical function delta1(x) - xor of results of right shifts/rotations |
| * @return int |
| * @param x int |
| */ |
| private static int lf_delta1(int x) { |
| return lf_S(x, 17) ^ lf_S(x, 19) ^ lf_R(x, 10); |
| } |
| |
| /** |
| * Process the current block to update the state variable state. |
| */ |
| void implCompress(byte[] buf, int ofs) { |
| b2iBig64(buf, ofs, W); |
| |
| // The first 16 ints are from the byte stream, compute the rest of |
| // the W[]'s |
| for (int t = 16; t < ITERATION; t++) { |
| W[t] = lf_delta1(W[t-2]) + W[t-7] + lf_delta0(W[t-15]) |
| + W[t-16]; |
| } |
| |
| int a = state[0]; |
| int b = state[1]; |
| int c = state[2]; |
| int d = state[3]; |
| int e = state[4]; |
| int f = state[5]; |
| int g = state[6]; |
| int h = state[7]; |
| |
| for (int i = 0; i < ITERATION; i++) { |
| int T1 = h + lf_sigma1(e) + lf_ch(e,f,g) + ROUND_CONSTS[i] + W[i]; |
| int T2 = lf_sigma0(a) + lf_maj(a,b,c); |
| h = g; |
| g = f; |
| f = e; |
| e = d + T1; |
| d = c; |
| c = b; |
| b = a; |
| a = T1 + T2; |
| } |
| state[0] += a; |
| state[1] += b; |
| state[2] += c; |
| state[3] += d; |
| state[4] += e; |
| state[5] += f; |
| state[6] += g; |
| state[7] += h; |
| } |
| |
| } |