Java tutorial
package org.bouncycastle.crypto.digests; import org.bouncycastle.util.Memoable; /** * implementation of RIPEMD see, * http://www.esat.kuleuven.ac.be/~bosselae/ripemd160.html */ public class RIPEMD160Digest extends GeneralDigest { private static final int DIGEST_LENGTH = 20; private int H0, H1, H2, H3, H4; // IV's private int[] X = new int[16]; private int xOff; /** * Standard constructor */ public RIPEMD160Digest() { reset(); } /** * Copy constructor. This will copy the state of the provided * message digest. */ public RIPEMD160Digest(RIPEMD160Digest t) { super(t); copyIn(t); } private void copyIn(RIPEMD160Digest t) { super.copyIn(t); H0 = t.H0; H1 = t.H1; H2 = t.H2; H3 = t.H3; H4 = t.H4; System.arraycopy(t.X, 0, X, 0, t.X.length); xOff = t.xOff; } public String getAlgorithmName() { return "RIPEMD160"; } public int getDigestSize() { return DIGEST_LENGTH; } protected void processWord(byte[] in, int inOff) { X[xOff++] = (in[inOff] & 0xff) | ((in[inOff + 1] & 0xff) << 8) | ((in[inOff + 2] & 0xff) << 16) | ((in[inOff + 3] & 0xff) << 24); if (xOff == 16) { processBlock(); } } protected void processLength(long bitLength) { if (xOff > 14) { processBlock(); } X[14] = (int) (bitLength & 0xffffffff); X[15] = (int) (bitLength >>> 32); } private void unpackWord(int word, byte[] out, int outOff) { out[outOff] = (byte) word; out[outOff + 1] = (byte) (word >>> 8); out[outOff + 2] = (byte) (word >>> 16); out[outOff + 3] = (byte) (word >>> 24); } public int doFinal(byte[] out, int outOff) { finish(); unpackWord(H0, out, outOff); unpackWord(H1, out, outOff + 4); unpackWord(H2, out, outOff + 8); unpackWord(H3, out, outOff + 12); unpackWord(H4, out, outOff + 16); reset(); return DIGEST_LENGTH; } /** * reset the chaining variables to the IV values. */ public void reset() { super.reset(); H0 = 0x67452301; H1 = 0xefcdab89; H2 = 0x98badcfe; H3 = 0x10325476; H4 = 0xc3d2e1f0; xOff = 0; for (int i = 0; i != X.length; i++) { X[i] = 0; } } /* * rotate int x left n bits. */ private int RL(int x, int n) { return (x << n) | (x >>> (32 - n)); } /* * f1,f2,f3,f4,f5 are the basic RIPEMD160 functions. */ /* * rounds 0-15 */ private int f1(int x, int y, int z) { return x ^ y ^ z; } /* * rounds 16-31 */ private int f2(int x, int y, int z) { return (x & y) | (~x & z); } /* * rounds 32-47 */ private int f3(int x, int y, int z) { return (x | ~y) ^ z; } /* * rounds 48-63 */ private int f4(int x, int y, int z) { return (x & z) | (y & ~z); } /* * rounds 64-79 */ private int f5(int x, int y, int z) { return x ^ (y | ~z); } protected void processBlock() { int a, aa; int b, bb; int c, cc; int d, dd; int e, ee; a = aa = H0; b = bb = H1; c = cc = H2; d = dd = H3; e = ee = H4; // // Rounds 1 - 16 // // left a = RL(a + f1(b, c, d) + X[0], 11) + e; c = RL(c, 10); e = RL(e + f1(a, b, c) + X[1], 14) + d; b = RL(b, 10); d = RL(d + f1(e, a, b) + X[2], 15) + c; a = RL(a, 10); c = RL(c + f1(d, e, a) + X[3], 12) + b; e = RL(e, 10); b = RL(b + f1(c, d, e) + X[4], 5) + a; d = RL(d, 10); a = RL(a + f1(b, c, d) + X[5], 8) + e; c = RL(c, 10); e = RL(e + f1(a, b, c) + X[6], 7) + d; b = RL(b, 10); d = RL(d + f1(e, a, b) + X[7], 9) + c; a = RL(a, 10); c = RL(c + f1(d, e, a) + X[8], 11) + b; e = RL(e, 10); b = RL(b + f1(c, d, e) + X[9], 13) + a; d = RL(d, 10); a = RL(a + f1(b, c, d) + X[10], 14) + e; c = RL(c, 10); e = RL(e + f1(a, b, c) + X[11], 15) + d; b = RL(b, 10); d = RL(d + f1(e, a, b) + X[12], 6) + c; a = RL(a, 10); c = RL(c + f1(d, e, a) + X[13], 7) + b; e = RL(e, 10); b = RL(b + f1(c, d, e) + X[14], 9) + a; d = RL(d, 10); a = RL(a + f1(b, c, d) + X[15], 8) + e; c = RL(c, 10); // right aa = RL(aa + f5(bb, cc, dd) + X[5] + 0x50a28be6, 8) + ee; cc = RL(cc, 10); ee = RL(ee + f5(aa, bb, cc) + X[14] + 0x50a28be6, 9) + dd; bb = RL(bb, 10); dd = RL(dd + f5(ee, aa, bb) + X[7] + 0x50a28be6, 9) + cc; aa = RL(aa, 10); cc = RL(cc + f5(dd, ee, aa) + X[0] + 0x50a28be6, 11) + bb; ee = RL(ee, 10); bb = RL(bb + f5(cc, dd, ee) + X[9] + 0x50a28be6, 13) + aa; dd = RL(dd, 10); aa = RL(aa + f5(bb, cc, dd) + X[2] + 0x50a28be6, 15) + ee; cc = RL(cc, 10); ee = RL(ee + f5(aa, bb, cc) + X[11] + 0x50a28be6, 15) + dd; bb = RL(bb, 10); dd = RL(dd + f5(ee, aa, bb) + X[4] + 0x50a28be6, 5) + cc; aa = RL(aa, 10); cc = RL(cc + f5(dd, ee, aa) + X[13] + 0x50a28be6, 7) + bb; ee = RL(ee, 10); bb = RL(bb + f5(cc, dd, ee) + X[6] + 0x50a28be6, 7) + aa; dd = RL(dd, 10); aa = RL(aa + f5(bb, cc, dd) + X[15] + 0x50a28be6, 8) + ee; cc = RL(cc, 10); ee = RL(ee + f5(aa, bb, cc) + X[8] + 0x50a28be6, 11) + dd; bb = RL(bb, 10); dd = RL(dd + f5(ee, aa, bb) + X[1] + 0x50a28be6, 14) + cc; aa = RL(aa, 10); cc = RL(cc + f5(dd, ee, aa) + X[10] + 0x50a28be6, 14) + bb; ee = RL(ee, 10); bb = RL(bb + f5(cc, dd, ee) + X[3] + 0x50a28be6, 12) + aa; dd = RL(dd, 10); aa = RL(aa + f5(bb, cc, dd) + X[12] + 0x50a28be6, 6) + ee; cc = RL(cc, 10); // // Rounds 16-31 // // left e = RL(e + f2(a, b, c) + X[7] + 0x5a827999, 7) + d; b = RL(b, 10); d = RL(d + f2(e, a, b) + X[4] + 0x5a827999, 6) + c; a = RL(a, 10); c = RL(c + f2(d, e, a) + X[13] + 0x5a827999, 8) + b; e = RL(e, 10); b = RL(b + f2(c, d, e) + X[1] + 0x5a827999, 13) + a; d = RL(d, 10); a = RL(a + f2(b, c, d) + X[10] + 0x5a827999, 11) + e; c = RL(c, 10); e = RL(e + f2(a, b, c) + X[6] + 0x5a827999, 9) + d; b = RL(b, 10); d = RL(d + f2(e, a, b) + X[15] + 0x5a827999, 7) + c; a = RL(a, 10); c = RL(c + f2(d, e, a) + X[3] + 0x5a827999, 15) + b; e = RL(e, 10); b = RL(b + f2(c, d, e) + X[12] + 0x5a827999, 7) + a; d = RL(d, 10); a = RL(a + f2(b, c, d) + X[0] + 0x5a827999, 12) + e; c = RL(c, 10); e = RL(e + f2(a, b, c) + X[9] + 0x5a827999, 15) + d; b = RL(b, 10); d = RL(d + f2(e, a, b) + X[5] + 0x5a827999, 9) + c; a = RL(a, 10); c = RL(c + f2(d, e, a) + X[2] + 0x5a827999, 11) + b; e = RL(e, 10); b = RL(b + f2(c, d, e) + X[14] + 0x5a827999, 7) + a; d = RL(d, 10); a = RL(a + f2(b, c, d) + X[11] + 0x5a827999, 13) + e; c = RL(c, 10); e = RL(e + f2(a, b, c) + X[8] + 0x5a827999, 12) + d; b = RL(b, 10); // right ee = RL(ee + f4(aa, bb, cc) + X[6] + 0x5c4dd124, 9) + dd; bb = RL(bb, 10); dd = RL(dd + f4(ee, aa, bb) + X[11] + 0x5c4dd124, 13) + cc; aa = RL(aa, 10); cc = RL(cc + f4(dd, ee, aa) + X[3] + 0x5c4dd124, 15) + bb; ee = RL(ee, 10); bb = RL(bb + f4(cc, dd, ee) + X[7] + 0x5c4dd124, 7) + aa; dd = RL(dd, 10); aa = RL(aa + f4(bb, cc, dd) + X[0] + 0x5c4dd124, 12) + ee; cc = RL(cc, 10); ee = RL(ee + f4(aa, bb, cc) + X[13] + 0x5c4dd124, 8) + dd; bb = RL(bb, 10); dd = RL(dd + f4(ee, aa, bb) + X[5] + 0x5c4dd124, 9) + cc; aa = RL(aa, 10); cc = RL(cc + f4(dd, ee, aa) + X[10] + 0x5c4dd124, 11) + bb; ee = RL(ee, 10); bb = RL(bb + f4(cc, dd, ee) + X[14] + 0x5c4dd124, 7) + aa; dd = RL(dd, 10); aa = RL(aa + f4(bb, cc, dd) + X[15] + 0x5c4dd124, 7) + ee; cc = RL(cc, 10); ee = RL(ee + f4(aa, bb, cc) + X[8] + 0x5c4dd124, 12) + dd; bb = RL(bb, 10); dd = RL(dd + f4(ee, aa, bb) + X[12] + 0x5c4dd124, 7) + cc; aa = RL(aa, 10); cc = RL(cc + f4(dd, ee, aa) + X[4] + 0x5c4dd124, 6) + bb; ee = RL(ee, 10); bb = RL(bb + f4(cc, dd, ee) + X[9] + 0x5c4dd124, 15) + aa; dd = RL(dd, 10); aa = RL(aa + f4(bb, cc, dd) + X[1] + 0x5c4dd124, 13) + ee; cc = RL(cc, 10); ee = RL(ee + f4(aa, bb, cc) + X[2] + 0x5c4dd124, 11) + dd; bb = RL(bb, 10); // // Rounds 32-47 // // left d = RL(d + f3(e, a, b) + X[3] + 0x6ed9eba1, 11) + c; a = RL(a, 10); c = RL(c + f3(d, e, a) + X[10] + 0x6ed9eba1, 13) + b; e = RL(e, 10); b = RL(b + f3(c, d, e) + X[14] + 0x6ed9eba1, 6) + a; d = RL(d, 10); a = RL(a + f3(b, c, d) + X[4] + 0x6ed9eba1, 7) + e; c = RL(c, 10); e = RL(e + f3(a, b, c) + X[9] + 0x6ed9eba1, 14) + d; b = RL(b, 10); d = RL(d + f3(e, a, b) + X[15] + 0x6ed9eba1, 9) + c; a = RL(a, 10); c = RL(c + f3(d, e, a) + X[8] + 0x6ed9eba1, 13) + b; e = RL(e, 10); b = RL(b + f3(c, d, e) + X[1] + 0x6ed9eba1, 15) + a; d = RL(d, 10); a = RL(a + f3(b, c, d) + X[2] + 0x6ed9eba1, 14) + e; c = RL(c, 10); e = RL(e + f3(a, b, c) + X[7] + 0x6ed9eba1, 8) + d; b = RL(b, 10); d = RL(d + f3(e, a, b) + X[0] + 0x6ed9eba1, 13) + c; a = RL(a, 10); c = RL(c + f3(d, e, a) + X[6] + 0x6ed9eba1, 6) + b; e = RL(e, 10); b = RL(b + f3(c, d, e) + X[13] + 0x6ed9eba1, 5) + a; d = RL(d, 10); a = RL(a + f3(b, c, d) + X[11] + 0x6ed9eba1, 12) + e; c = RL(c, 10); e = RL(e + f3(a, b, c) + X[5] + 0x6ed9eba1, 7) + d; b = RL(b, 10); d = RL(d + f3(e, a, b) + X[12] + 0x6ed9eba1, 5) + c; a = RL(a, 10); // right dd = RL(dd + f3(ee, aa, bb) + X[15] + 0x6d703ef3, 9) + cc; aa = RL(aa, 10); cc = RL(cc + f3(dd, ee, aa) + X[5] + 0x6d703ef3, 7) + bb; ee = RL(ee, 10); bb = RL(bb + f3(cc, dd, ee) + X[1] + 0x6d703ef3, 15) + aa; dd = RL(dd, 10); aa = RL(aa + f3(bb, cc, dd) + X[3] + 0x6d703ef3, 11) + ee; cc = RL(cc, 10); ee = RL(ee + f3(aa, bb, cc) + X[7] + 0x6d703ef3, 8) + dd; bb = RL(bb, 10); dd = RL(dd + f3(ee, aa, bb) + X[14] + 0x6d703ef3, 6) + cc; aa = RL(aa, 10); cc = RL(cc + f3(dd, ee, aa) + X[6] + 0x6d703ef3, 6) + bb; ee = RL(ee, 10); bb = RL(bb + f3(cc, dd, ee) + X[9] + 0x6d703ef3, 14) + aa; dd = RL(dd, 10); aa = RL(aa + f3(bb, cc, dd) + X[11] + 0x6d703ef3, 12) + ee; cc = RL(cc, 10); ee = RL(ee + f3(aa, bb, cc) + X[8] + 0x6d703ef3, 13) + dd; bb = RL(bb, 10); dd = RL(dd + f3(ee, aa, bb) + X[12] + 0x6d703ef3, 5) + cc; aa = RL(aa, 10); cc = RL(cc + f3(dd, ee, aa) + X[2] + 0x6d703ef3, 14) + bb; ee = RL(ee, 10); bb = RL(bb + f3(cc, dd, ee) + X[10] + 0x6d703ef3, 13) + aa; dd = RL(dd, 10); aa = RL(aa + f3(bb, cc, dd) + X[0] + 0x6d703ef3, 13) + ee; cc = RL(cc, 10); ee = RL(ee + f3(aa, bb, cc) + X[4] + 0x6d703ef3, 7) + dd; bb = RL(bb, 10); dd = RL(dd + f3(ee, aa, bb) + X[13] + 0x6d703ef3, 5) + cc; aa = RL(aa, 10); // // Rounds 48-63 // // left c = RL(c + f4(d, e, a) + X[1] + 0x8f1bbcdc, 11) + b; e = RL(e, 10); b = RL(b + f4(c, d, e) + X[9] + 0x8f1bbcdc, 12) + a; d = RL(d, 10); a = RL(a + f4(b, c, d) + X[11] + 0x8f1bbcdc, 14) + e; c = RL(c, 10); e = RL(e + f4(a, b, c) + X[10] + 0x8f1bbcdc, 15) + d; b = RL(b, 10); d = RL(d + f4(e, a, b) + X[0] + 0x8f1bbcdc, 14) + c; a = RL(a, 10); c = RL(c + f4(d, e, a) + X[8] + 0x8f1bbcdc, 15) + b; e = RL(e, 10); b = RL(b + f4(c, d, e) + X[12] + 0x8f1bbcdc, 9) + a; d = RL(d, 10); a = RL(a + f4(b, c, d) + X[4] + 0x8f1bbcdc, 8) + e; c = RL(c, 10); e = RL(e + f4(a, b, c) + X[13] + 0x8f1bbcdc, 9) + d; b = RL(b, 10); d = RL(d + f4(e, a, b) + X[3] + 0x8f1bbcdc, 14) + c; a = RL(a, 10); c = RL(c + f4(d, e, a) + X[7] + 0x8f1bbcdc, 5) + b; e = RL(e, 10); b = RL(b + f4(c, d, e) + X[15] + 0x8f1bbcdc, 6) + a; d = RL(d, 10); a = RL(a + f4(b, c, d) + X[14] + 0x8f1bbcdc, 8) + e; c = RL(c, 10); e = RL(e + f4(a, b, c) + X[5] + 0x8f1bbcdc, 6) + d; b = RL(b, 10); d = RL(d + f4(e, a, b) + X[6] + 0x8f1bbcdc, 5) + c; a = RL(a, 10); c = RL(c + f4(d, e, a) + X[2] + 0x8f1bbcdc, 12) + b; e = RL(e, 10); // right cc = RL(cc + f2(dd, ee, aa) + X[8] + 0x7a6d76e9, 15) + bb; ee = RL(ee, 10); bb = RL(bb + f2(cc, dd, ee) + X[6] + 0x7a6d76e9, 5) + aa; dd = RL(dd, 10); aa = RL(aa + f2(bb, cc, dd) + X[4] + 0x7a6d76e9, 8) + ee; cc = RL(cc, 10); ee = RL(ee + f2(aa, bb, cc) + X[1] + 0x7a6d76e9, 11) + dd; bb = RL(bb, 10); dd = RL(dd + f2(ee, aa, bb) + X[3] + 0x7a6d76e9, 14) + cc; aa = RL(aa, 10); cc = RL(cc + f2(dd, ee, aa) + X[11] + 0x7a6d76e9, 14) + bb; ee = RL(ee, 10); bb = RL(bb + f2(cc, dd, ee) + X[15] + 0x7a6d76e9, 6) + aa; dd = RL(dd, 10); aa = RL(aa + f2(bb, cc, dd) + X[0] + 0x7a6d76e9, 14) + ee; cc = RL(cc, 10); ee = RL(ee + f2(aa, bb, cc) + X[5] + 0x7a6d76e9, 6) + dd; bb = RL(bb, 10); dd = RL(dd + f2(ee, aa, bb) + X[12] + 0x7a6d76e9, 9) + cc; aa = RL(aa, 10); cc = RL(cc + f2(dd, ee, aa) + X[2] + 0x7a6d76e9, 12) + bb; ee = RL(ee, 10); bb = RL(bb + f2(cc, dd, ee) + X[13] + 0x7a6d76e9, 9) + aa; dd = RL(dd, 10); aa = RL(aa + f2(bb, cc, dd) + X[9] + 0x7a6d76e9, 12) + ee; cc = RL(cc, 10); ee = RL(ee + f2(aa, bb, cc) + X[7] + 0x7a6d76e9, 5) + dd; bb = RL(bb, 10); dd = RL(dd + f2(ee, aa, bb) + X[10] + 0x7a6d76e9, 15) + cc; aa = RL(aa, 10); cc = RL(cc + f2(dd, ee, aa) + X[14] + 0x7a6d76e9, 8) + bb; ee = RL(ee, 10); // // Rounds 64-79 // // left b = RL(b + f5(c, d, e) + X[4] + 0xa953fd4e, 9) + a; d = RL(d, 10); a = RL(a + f5(b, c, d) + X[0] + 0xa953fd4e, 15) + e; c = RL(c, 10); e = RL(e + f5(a, b, c) + X[5] + 0xa953fd4e, 5) + d; b = RL(b, 10); d = RL(d + f5(e, a, b) + X[9] + 0xa953fd4e, 11) + c; a = RL(a, 10); c = RL(c + f5(d, e, a) + X[7] + 0xa953fd4e, 6) + b; e = RL(e, 10); b = RL(b + f5(c, d, e) + X[12] + 0xa953fd4e, 8) + a; d = RL(d, 10); a = RL(a + f5(b, c, d) + X[2] + 0xa953fd4e, 13) + e; c = RL(c, 10); e = RL(e + f5(a, b, c) + X[10] + 0xa953fd4e, 12) + d; b = RL(b, 10); d = RL(d + f5(e, a, b) + X[14] + 0xa953fd4e, 5) + c; a = RL(a, 10); c = RL(c + f5(d, e, a) + X[1] + 0xa953fd4e, 12) + b; e = RL(e, 10); b = RL(b + f5(c, d, e) + X[3] + 0xa953fd4e, 13) + a; d = RL(d, 10); a = RL(a + f5(b, c, d) + X[8] + 0xa953fd4e, 14) + e; c = RL(c, 10); e = RL(e + f5(a, b, c) + X[11] + 0xa953fd4e, 11) + d; b = RL(b, 10); d = RL(d + f5(e, a, b) + X[6] + 0xa953fd4e, 8) + c; a = RL(a, 10); c = RL(c + f5(d, e, a) + X[15] + 0xa953fd4e, 5) + b; e = RL(e, 10); b = RL(b + f5(c, d, e) + X[13] + 0xa953fd4e, 6) + a; d = RL(d, 10); // right bb = RL(bb + f1(cc, dd, ee) + X[12], 8) + aa; dd = RL(dd, 10); aa = RL(aa + f1(bb, cc, dd) + X[15], 5) + ee; cc = RL(cc, 10); ee = RL(ee + f1(aa, bb, cc) + X[10], 12) + dd; bb = RL(bb, 10); dd = RL(dd + f1(ee, aa, bb) + X[4], 9) + cc; aa = RL(aa, 10); cc = RL(cc + f1(dd, ee, aa) + X[1], 12) + bb; ee = RL(ee, 10); bb = RL(bb + f1(cc, dd, ee) + X[5], 5) + aa; dd = RL(dd, 10); aa = RL(aa + f1(bb, cc, dd) + X[8], 14) + ee; cc = RL(cc, 10); ee = RL(ee + f1(aa, bb, cc) + X[7], 6) + dd; bb = RL(bb, 10); dd = RL(dd + f1(ee, aa, bb) + X[6], 8) + cc; aa = RL(aa, 10); cc = RL(cc + f1(dd, ee, aa) + X[2], 13) + bb; ee = RL(ee, 10); bb = RL(bb + f1(cc, dd, ee) + X[13], 6) + aa; dd = RL(dd, 10); aa = RL(aa + f1(bb, cc, dd) + X[14], 5) + ee; cc = RL(cc, 10); ee = RL(ee + f1(aa, bb, cc) + X[0], 15) + dd; bb = RL(bb, 10); dd = RL(dd + f1(ee, aa, bb) + X[3], 13) + cc; aa = RL(aa, 10); cc = RL(cc + f1(dd, ee, aa) + X[9], 11) + bb; ee = RL(ee, 10); bb = RL(bb + f1(cc, dd, ee) + X[11], 11) + aa; dd = RL(dd, 10); dd += c + H1; H1 = H2 + d + ee; H2 = H3 + e + aa; H3 = H4 + a + bb; H4 = H0 + b + cc; H0 = dd; // // reset the offset and clean out the word buffer. // xOff = 0; for (int i = 0; i != X.length; i++) { X[i] = 0; } } public Memoable copy() { return new RIPEMD160Digest(this); } public void reset(Memoable other) { RIPEMD160Digest d = (RIPEMD160Digest) other; copyIn(d); } }