diff options
Diffstat (limited to 'libjava/classpath/gnu/java/security/hash/RipeMD128.java')
| -rw-r--r-- | libjava/classpath/gnu/java/security/hash/RipeMD128.java | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/security/hash/RipeMD128.java b/libjava/classpath/gnu/java/security/hash/RipeMD128.java new file mode 100644 index 000000000..bd0adc5e0 --- /dev/null +++ b/libjava/classpath/gnu/java/security/hash/RipeMD128.java @@ -0,0 +1,257 @@ +/* RipeMD128.java -- + Copyright (C) 2001, 2002, 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; + +/** + * RIPEMD-128 is a 128-bit message digest. + * <p> + * References: + * <ol> + * <li><a href="http://www.esat.kuleuven.ac.be/~bosselae/ripemd160.html"> + * RIPEMD160</a>: A Strengthened Version of RIPEMD.<br> + * Hans Dobbertin, Antoon Bosselaers and Bart Preneel.</li> + * </ol> + */ +public class RipeMD128 + extends BaseHash +{ + private static final int BLOCK_SIZE = 64; // inner block size in bytes + + private static final String DIGEST0 = "CDF26213A150DC3ECB610F18F6B38B46"; + + /** Constants for the transform method. */ + // selection of message word + private static final int[] R = { + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, + 7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8, + 3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12, + 1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2 }; + + private static final int[] Rp = { + 5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12, + 6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2, + 15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13, + 8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14 }; + + // amount for rotate left (rol) + private static final int[] S = { + 11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8, + 7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12, + 11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5, + 11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12 }; + + private static final int[] Sp = { + 8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6, + 9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11, + 9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5, + 15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8 }; + + /** caches the result of the correctness test, once executed. */ + private static Boolean valid; + + /** 128-bit h0, h1, h2, h3 (interim result) */ + private int h0, h1, h2, h3; + + /** 512 bits work buffer = 16 x 32-bit words */ + private int[] X = new int[16]; + + /** Trivial 0-arguments constructor. */ + public RipeMD128() + { + super(Registry.RIPEMD128_HASH, 16, BLOCK_SIZE); + } + + /** + * Private constructor for cloning purposes. + * + * @param md the instance to clone. + */ + private RipeMD128(RipeMD128 md) + { + this(); + + this.h0 = md.h0; + this.h1 = md.h1; + this.h2 = md.h2; + this.h3 = md.h3; + this.count = md.count; + this.buffer = (byte[]) md.buffer.clone(); + } + + public Object clone() + { + return new RipeMD128(this); + } + + protected void transform(byte[] in, int offset) + { + int A, B, C, D, Ap, Bp, Cp, Dp, T, s, i; + // encode 64 bytes from input block into an array of 16 unsigned integers. + for (i = 0; i < 16; i++) + X[i] = (in[offset++] & 0xFF) + | (in[offset++] & 0xFF) << 8 + | (in[offset++] & 0xFF) << 16 + | in[offset++] << 24; + A = Ap = h0; + B = Bp = h1; + C = Cp = h2; + D = Dp = h3; + for (i = 0; i < 16; i++) // rounds 0...15 + { + s = S[i]; + T = A + (B ^ C ^ D) + X[i]; + A = D; + D = C; + C = B; + B = T << s | T >>> (32 - s); + + s = Sp[i]; + T = Ap + ((Bp & Dp) | (Cp & ~Dp)) + X[Rp[i]] + 0x50A28BE6; + Ap = Dp; + Dp = Cp; + Cp = Bp; + Bp = T << s | T >>> (32 - s); + } + for (; i < 32; i++) // rounds 16...31 + { + s = S[i]; + T = A + ((B & C) | (~B & D)) + X[R[i]] + 0x5A827999; + A = D; + D = C; + C = B; + B = T << s | T >>> (32 - s); + + s = Sp[i]; + T = Ap + ((Bp | ~Cp) ^ Dp) + X[Rp[i]] + 0x5C4DD124; + Ap = Dp; + Dp = Cp; + Cp = Bp; + Bp = T << s | T >>> (32 - s); + } + for (; i < 48; i++) // rounds 32...47 + { + s = S[i]; + T = A + ((B | ~C) ^ D) + X[R[i]] + 0x6ED9EBA1; + A = D; + D = C; + C = B; + B = T << s | T >>> (32 - s); + + s = Sp[i]; + T = Ap + ((Bp & Cp) | (~Bp & Dp)) + X[Rp[i]] + 0x6D703EF3; + Ap = Dp; + Dp = Cp; + Cp = Bp; + Bp = T << s | T >>> (32 - s); + } + for (; i < 64; i++) // rounds 48...63 + { + s = S[i]; + T = A + ((B & D) | (C & ~D)) + X[R[i]] + 0x8F1BBCDC; + A = D; + D = C; + C = B; + B = T << s | T >>> (32 - s); + + s = Sp[i]; + T = Ap + (Bp ^ Cp ^ Dp) + X[Rp[i]]; + Ap = Dp; + Dp = Cp; + Cp = Bp; + Bp = T << s | T >>> (32 - s); + } + T = h1 + C + Dp; + h1 = h2 + D + Ap; + h2 = h3 + A + Bp; + h3 = h0 + B + Cp; + h0 = T; + } + + 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; + result[padding++] = (byte)(bits >>> 8); + result[padding++] = (byte)(bits >>> 16); + result[padding++] = (byte)(bits >>> 24); + result[padding++] = (byte)(bits >>> 32); + result[padding++] = (byte)(bits >>> 40); + result[padding++] = (byte)(bits >>> 48); + result[padding ] = (byte)(bits >>> 56); + return result; + } + + protected byte[] getResult() + { + return new byte[] { + (byte) h0, (byte)(h0 >>> 8), (byte)(h0 >>> 16), (byte)(h0 >>> 24), + (byte) h1, (byte)(h1 >>> 8), (byte)(h1 >>> 16), (byte)(h1 >>> 24), + (byte) h2, (byte)(h2 >>> 8), (byte)(h2 >>> 16), (byte)(h2 >>> 24), + (byte) h3, (byte)(h3 >>> 8), (byte)(h3 >>> 16), (byte)(h3 >>> 24) + }; + } + + protected void resetContext() + { + // magic RIPEMD128 initialisation constants + h0 = 0x67452301; + h1 = 0xEFCDAB89; + h2 = 0x98BADCFE; + h3 = 0x10325476; + } + + public boolean selfTest() + { + if (valid == null) + { + String d = Util.toString(new RipeMD128().digest()); + valid = Boolean.valueOf(DIGEST0.equals(d)); + } + return valid.booleanValue(); + } +} |