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Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/security/hash/Sha256.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/java/security/hash/Sha256.java | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/security/hash/Sha256.java b/gcc-4.4.3/libjava/classpath/gnu/java/security/hash/Sha256.java new file mode 100644 index 000000000..536b1c8ba --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/java/security/hash/Sha256.java @@ -0,0 +1,252 @@ +/* Sha256.java -- + Copyright (C) 2003, 2006 Free Software Foundation, Inc. + +This file is a part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or (at +your option) any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; if not, write to the Free Software +Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 +USA + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.security.hash; + +import gnu.java.security.Registry; +import gnu.java.security.util.Util; + +/** + * Implementation of SHA2-1 [SHA-256] per the IETF Draft Specification. + * <p> + * References: + * <ol> + * <li><a href="http://ftp.ipv4.heanet.ie/pub/ietf/internet-drafts/draft-ietf-ipsec-ciph-aes-cbc-03.txt"> + * Descriptions of SHA-256, SHA-384, and SHA-512</a>,</li> + * <li>http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf</li> + * </ol> + */ +public class Sha256 + extends BaseHash +{ + private static final int[] k = { + 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 + }; + + private static final int BLOCK_SIZE = 64; // inner block size in bytes + + private static final String DIGEST0 = + "BA7816BF8F01CFEA414140DE5DAE2223B00361A396177A9CB410FF61F20015AD"; + + private static final int[] w = new int[64]; + + /** caches the result of the correctness test, once executed. */ + private static Boolean valid; + + /** 256-bit interim result. */ + private int h0, h1, h2, h3, h4, h5, h6, h7; + + /** Trivial 0-arguments constructor. */ + public Sha256() + { + super(Registry.SHA256_HASH, 32, BLOCK_SIZE); + } + + /** + * Private constructor for cloning purposes. + * + * @param md the instance to clone. + */ + private Sha256(Sha256 md) + { + this(); + + this.h0 = md.h0; + this.h1 = md.h1; + this.h2 = md.h2; + this.h3 = md.h3; + this.h4 = md.h4; + this.h5 = md.h5; + this.h6 = md.h6; + this.h7 = md.h7; + this.count = md.count; + this.buffer = (byte[]) md.buffer.clone(); + } + + public static final int[] G(int hh0, int hh1, int hh2, int hh3, int hh4, + int hh5, int hh6, int hh7, byte[] in, int offset) + { + return sha(hh0, hh1, hh2, hh3, hh4, hh5, hh6, hh7, in, offset); + } + + public Object clone() + { + return new Sha256(this); + } + + protected void transform(byte[] in, int offset) + { + int[] result = sha(h0, h1, h2, h3, h4, h5, h6, h7, in, offset); + h0 = result[0]; + h1 = result[1]; + h2 = result[2]; + h3 = result[3]; + h4 = result[4]; + h5 = result[5]; + h6 = result[6]; + h7 = result[7]; + } + + protected byte[] padBuffer() + { + int n = (int)(count % BLOCK_SIZE); + int padding = (n < 56) ? (56 - n) : (120 - n); + byte[] result = new byte[padding + 8]; + // padding is always binary 1 followed by binary 0s + result[0] = (byte) 0x80; + // save number of bits, casting the long to an array of 8 bytes + long bits = count << 3; + result[padding++] = (byte)(bits >>> 56); + result[padding++] = (byte)(bits >>> 48); + result[padding++] = (byte)(bits >>> 40); + result[padding++] = (byte)(bits >>> 32); + result[padding++] = (byte)(bits >>> 24); + result[padding++] = (byte)(bits >>> 16); + result[padding++] = (byte)(bits >>> 8); + result[padding ] = (byte) bits; + return result; + } + + protected byte[] getResult() + { + return new byte[] { + (byte)(h0 >>> 24), (byte)(h0 >>> 16), (byte)(h0 >>> 8), (byte) h0, + (byte)(h1 >>> 24), (byte)(h1 >>> 16), (byte)(h1 >>> 8), (byte) h1, + (byte)(h2 >>> 24), (byte)(h2 >>> 16), (byte)(h2 >>> 8), (byte) h2, + (byte)(h3 >>> 24), (byte)(h3 >>> 16), (byte)(h3 >>> 8), (byte) h3, + (byte)(h4 >>> 24), (byte)(h4 >>> 16), (byte)(h4 >>> 8), (byte) h4, + (byte)(h5 >>> 24), (byte)(h5 >>> 16), (byte)(h5 >>> 8), (byte) h5, + (byte)(h6 >>> 24), (byte)(h6 >>> 16), (byte)(h6 >>> 8), (byte) h6, + (byte)(h7 >>> 24), (byte)(h7 >>> 16), (byte)(h7 >>> 8), (byte) h7 }; + } + + protected void resetContext() + { + // magic SHA-256 initialisation constants + h0 = 0x6a09e667; + h1 = 0xbb67ae85; + h2 = 0x3c6ef372; + h3 = 0xa54ff53a; + h4 = 0x510e527f; + h5 = 0x9b05688c; + h6 = 0x1f83d9ab; + h7 = 0x5be0cd19; + } + + public boolean selfTest() + { + if (valid == null) + { + Sha256 md = new Sha256(); + md.update((byte) 0x61); // a + md.update((byte) 0x62); // b + md.update((byte) 0x63); // c + String result = Util.toString(md.digest()); + valid = Boolean.valueOf(DIGEST0.equals(result)); + } + return valid.booleanValue(); + } + + private static synchronized final int[] sha(int hh0, int hh1, int hh2, + int hh3, int hh4, int hh5, + int hh6, int hh7, byte[] in, + int offset) + { + int A = hh0; + int B = hh1; + int C = hh2; + int D = hh3; + int E = hh4; + int F = hh5; + int G = hh6; + int H = hh7; + int r, T, T2; + for (r = 0; r < 16; r++) + w[r] = (in[offset++] << 24 + | (in[offset++] & 0xFF) << 16 + | (in[offset++] & 0xFF) << 8 + | (in[offset++] & 0xFF)); + for (r = 16; r < 64; r++) + { + T = w[r - 2]; + T2 = w[r - 15]; + w[r] = ((((T >>> 17) | (T << 15)) ^ ((T >>> 19) | (T << 13)) ^ (T >>> 10)) + + w[r - 7] + + (((T2 >>> 7) | (T2 << 25)) + ^ ((T2 >>> 18) | (T2 << 14)) + ^ (T2 >>> 3)) + w[r - 16]); + } + for (r = 0; r < 64; r++) + { + T = (H + + (((E >>> 6) | (E << 26)) + ^ ((E >>> 11) | (E << 21)) + ^ ((E >>> 25) | (E << 7))) + + ((E & F) ^ (~E & G)) + k[r] + w[r]); + T2 = ((((A >>> 2) | (A << 30)) + ^ ((A >>> 13) | (A << 19)) + ^ ((A >>> 22) | (A << 10))) + ((A & B) ^ (A & C) ^ (B & C))); + H = G; + G = F; + F = E; + E = D + T; + D = C; + C = B; + B = A; + A = T + T2; + } + return new int[] { + hh0 + A, hh1 + B, hh2 + C, hh3 + D, + hh4 + E, hh5 + F, hh6 + G, hh7 + H }; + } +} |