diff options
Diffstat (limited to 'bcprov/src/main/java/org/bouncycastle/crypto/digests/RIPEMD256Digest.java')
| -rw-r--r-- | bcprov/src/main/java/org/bouncycastle/crypto/digests/RIPEMD256Digest.java | 497 |
1 files changed, 497 insertions, 0 deletions
diff --git a/bcprov/src/main/java/org/bouncycastle/crypto/digests/RIPEMD256Digest.java b/bcprov/src/main/java/org/bouncycastle/crypto/digests/RIPEMD256Digest.java new file mode 100644 index 0000000..86746b4 --- /dev/null +++ b/bcprov/src/main/java/org/bouncycastle/crypto/digests/RIPEMD256Digest.java @@ -0,0 +1,497 @@ +package org.bouncycastle.crypto.digests; + + +import org.bouncycastle.util.Memoable; + +/** + * implementation of RIPEMD256. + * <p> + * <b>note:</b> this algorithm offers the same level of security as RIPEMD128. + */ +public class RIPEMD256Digest + extends GeneralDigest +{ + private static final int DIGEST_LENGTH = 32; + + private int H0, H1, H2, H3, H4, H5, H6, H7; // IV's + + private int[] X = new int[16]; + private int xOff; + + /** + * Standard constructor + */ + public RIPEMD256Digest() + { + reset(); + } + + /** + * Copy constructor. This will copy the state of the provided + * message digest. + */ + public RIPEMD256Digest(RIPEMD256Digest t) + { + super(t); + + copyIn(t); + } + + private void copyIn(RIPEMD256Digest t) + { + super.copyIn(t); + + H0 = t.H0; + H1 = t.H1; + H2 = t.H2; + H3 = t.H3; + H4 = t.H4; + H5 = t.H5; + H6 = t.H6; + H7 = t.H7; + + System.arraycopy(t.X, 0, X, 0, t.X.length); + xOff = t.xOff; + } + + public String getAlgorithmName() + { + return "RIPEMD256"; + } + + 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); + unpackWord(H5, out, outOff + 20); + unpackWord(H6, out, outOff + 24); + unpackWord(H7, out, outOff + 28); + + 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 = 0x76543210; + H5 = 0xFEDCBA98; + H6 = 0x89ABCDEF; + H7 = 0x01234567; + + 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 are the basic RIPEMD128 functions. + */ + + /* + * F + */ + private int f1( + int x, + int y, + int z) + { + return x ^ y ^ z; + } + + /* + * G + */ + private int f2( + int x, + int y, + int z) + { + return (x & y) | (~x & z); + } + + /* + * H + */ + private int f3( + int x, + int y, + int z) + { + return (x | ~y) ^ z; + } + + /* + * I + */ + private int f4( + int x, + int y, + int z) + { + return (x & z) | (y & ~z); + } + + private int F1( + int a, + int b, + int c, + int d, + int x, + int s) + { + return RL(a + f1(b, c, d) + x, s); + } + + private int F2( + int a, + int b, + int c, + int d, + int x, + int s) + { + return RL(a + f2(b, c, d) + x + 0x5a827999, s); + } + + private int F3( + int a, + int b, + int c, + int d, + int x, + int s) + { + return RL(a + f3(b, c, d) + x + 0x6ed9eba1, s); + } + + private int F4( + int a, + int b, + int c, + int d, + int x, + int s) + { + return RL(a + f4(b, c, d) + x + 0x8f1bbcdc, s); + } + + private int FF1( + int a, + int b, + int c, + int d, + int x, + int s) + { + return RL(a + f1(b, c, d) + x, s); + } + + private int FF2( + int a, + int b, + int c, + int d, + int x, + int s) + { + return RL(a + f2(b, c, d) + x + 0x6d703ef3, s); + } + + private int FF3( + int a, + int b, + int c, + int d, + int x, + int s) + { + return RL(a + f3(b, c, d) + x + 0x5c4dd124, s); + } + + private int FF4( + int a, + int b, + int c, + int d, + int x, + int s) + { + return RL(a + f4(b, c, d) + x + 0x50a28be6, s); + } + + protected void processBlock() + { + int a, aa; + int b, bb; + int c, cc; + int d, dd; + int t; + + a = H0; + b = H1; + c = H2; + d = H3; + aa = H4; + bb = H5; + cc = H6; + dd = H7; + + // + // Round 1 + // + + a = F1(a, b, c, d, X[ 0], 11); + d = F1(d, a, b, c, X[ 1], 14); + c = F1(c, d, a, b, X[ 2], 15); + b = F1(b, c, d, a, X[ 3], 12); + a = F1(a, b, c, d, X[ 4], 5); + d = F1(d, a, b, c, X[ 5], 8); + c = F1(c, d, a, b, X[ 6], 7); + b = F1(b, c, d, a, X[ 7], 9); + a = F1(a, b, c, d, X[ 8], 11); + d = F1(d, a, b, c, X[ 9], 13); + c = F1(c, d, a, b, X[10], 14); + b = F1(b, c, d, a, X[11], 15); + a = F1(a, b, c, d, X[12], 6); + d = F1(d, a, b, c, X[13], 7); + c = F1(c, d, a, b, X[14], 9); + b = F1(b, c, d, a, X[15], 8); + + aa = FF4(aa, bb, cc, dd, X[ 5], 8); + dd = FF4(dd, aa, bb, cc, X[14], 9); + cc = FF4(cc, dd, aa, bb, X[ 7], 9); + bb = FF4(bb, cc, dd, aa, X[ 0], 11); + aa = FF4(aa, bb, cc, dd, X[ 9], 13); + dd = FF4(dd, aa, bb, cc, X[ 2], 15); + cc = FF4(cc, dd, aa, bb, X[11], 15); + bb = FF4(bb, cc, dd, aa, X[ 4], 5); + aa = FF4(aa, bb, cc, dd, X[13], 7); + dd = FF4(dd, aa, bb, cc, X[ 6], 7); + cc = FF4(cc, dd, aa, bb, X[15], 8); + bb = FF4(bb, cc, dd, aa, X[ 8], 11); + aa = FF4(aa, bb, cc, dd, X[ 1], 14); + dd = FF4(dd, aa, bb, cc, X[10], 14); + cc = FF4(cc, dd, aa, bb, X[ 3], 12); + bb = FF4(bb, cc, dd, aa, X[12], 6); + + t = a; a = aa; aa = t; + + // + // Round 2 + // + a = F2(a, b, c, d, X[ 7], 7); + d = F2(d, a, b, c, X[ 4], 6); + c = F2(c, d, a, b, X[13], 8); + b = F2(b, c, d, a, X[ 1], 13); + a = F2(a, b, c, d, X[10], 11); + d = F2(d, a, b, c, X[ 6], 9); + c = F2(c, d, a, b, X[15], 7); + b = F2(b, c, d, a, X[ 3], 15); + a = F2(a, b, c, d, X[12], 7); + d = F2(d, a, b, c, X[ 0], 12); + c = F2(c, d, a, b, X[ 9], 15); + b = F2(b, c, d, a, X[ 5], 9); + a = F2(a, b, c, d, X[ 2], 11); + d = F2(d, a, b, c, X[14], 7); + c = F2(c, d, a, b, X[11], 13); + b = F2(b, c, d, a, X[ 8], 12); + + aa = FF3(aa, bb, cc, dd, X[ 6], 9); + dd = FF3(dd, aa, bb, cc, X[ 11], 13); + cc = FF3(cc, dd, aa, bb, X[3], 15); + bb = FF3(bb, cc, dd, aa, X[ 7], 7); + aa = FF3(aa, bb, cc, dd, X[0], 12); + dd = FF3(dd, aa, bb, cc, X[13], 8); + cc = FF3(cc, dd, aa, bb, X[5], 9); + bb = FF3(bb, cc, dd, aa, X[10], 11); + aa = FF3(aa, bb, cc, dd, X[14], 7); + dd = FF3(dd, aa, bb, cc, X[15], 7); + cc = FF3(cc, dd, aa, bb, X[ 8], 12); + bb = FF3(bb, cc, dd, aa, X[12], 7); + aa = FF3(aa, bb, cc, dd, X[ 4], 6); + dd = FF3(dd, aa, bb, cc, X[ 9], 15); + cc = FF3(cc, dd, aa, bb, X[ 1], 13); + bb = FF3(bb, cc, dd, aa, X[ 2], 11); + + t = b; b = bb; bb = t; + + // + // Round 3 + // + a = F3(a, b, c, d, X[ 3], 11); + d = F3(d, a, b, c, X[10], 13); + c = F3(c, d, a, b, X[14], 6); + b = F3(b, c, d, a, X[ 4], 7); + a = F3(a, b, c, d, X[ 9], 14); + d = F3(d, a, b, c, X[15], 9); + c = F3(c, d, a, b, X[ 8], 13); + b = F3(b, c, d, a, X[ 1], 15); + a = F3(a, b, c, d, X[ 2], 14); + d = F3(d, a, b, c, X[ 7], 8); + c = F3(c, d, a, b, X[ 0], 13); + b = F3(b, c, d, a, X[ 6], 6); + a = F3(a, b, c, d, X[13], 5); + d = F3(d, a, b, c, X[11], 12); + c = F3(c, d, a, b, X[ 5], 7); + b = F3(b, c, d, a, X[12], 5); + + aa = FF2(aa, bb, cc, dd, X[ 15], 9); + dd = FF2(dd, aa, bb, cc, X[5], 7); + cc = FF2(cc, dd, aa, bb, X[1], 15); + bb = FF2(bb, cc, dd, aa, X[ 3], 11); + aa = FF2(aa, bb, cc, dd, X[ 7], 8); + dd = FF2(dd, aa, bb, cc, X[14], 6); + cc = FF2(cc, dd, aa, bb, X[ 6], 6); + bb = FF2(bb, cc, dd, aa, X[ 9], 14); + aa = FF2(aa, bb, cc, dd, X[11], 12); + dd = FF2(dd, aa, bb, cc, X[ 8], 13); + cc = FF2(cc, dd, aa, bb, X[12], 5); + bb = FF2(bb, cc, dd, aa, X[ 2], 14); + aa = FF2(aa, bb, cc, dd, X[10], 13); + dd = FF2(dd, aa, bb, cc, X[ 0], 13); + cc = FF2(cc, dd, aa, bb, X[ 4], 7); + bb = FF2(bb, cc, dd, aa, X[13], 5); + + t = c; c = cc; cc = t; + + // + // Round 4 + // + a = F4(a, b, c, d, X[ 1], 11); + d = F4(d, a, b, c, X[ 9], 12); + c = F4(c, d, a, b, X[11], 14); + b = F4(b, c, d, a, X[10], 15); + a = F4(a, b, c, d, X[ 0], 14); + d = F4(d, a, b, c, X[ 8], 15); + c = F4(c, d, a, b, X[12], 9); + b = F4(b, c, d, a, X[ 4], 8); + a = F4(a, b, c, d, X[13], 9); + d = F4(d, a, b, c, X[ 3], 14); + c = F4(c, d, a, b, X[ 7], 5); + b = F4(b, c, d, a, X[15], 6); + a = F4(a, b, c, d, X[14], 8); + d = F4(d, a, b, c, X[ 5], 6); + c = F4(c, d, a, b, X[ 6], 5); + b = F4(b, c, d, a, X[ 2], 12); + + aa = FF1(aa, bb, cc, dd, X[ 8], 15); + dd = FF1(dd, aa, bb, cc, X[ 6], 5); + cc = FF1(cc, dd, aa, bb, X[ 4], 8); + bb = FF1(bb, cc, dd, aa, X[ 1], 11); + aa = FF1(aa, bb, cc, dd, X[ 3], 14); + dd = FF1(dd, aa, bb, cc, X[11], 14); + cc = FF1(cc, dd, aa, bb, X[15], 6); + bb = FF1(bb, cc, dd, aa, X[ 0], 14); + aa = FF1(aa, bb, cc, dd, X[ 5], 6); + dd = FF1(dd, aa, bb, cc, X[12], 9); + cc = FF1(cc, dd, aa, bb, X[ 2], 12); + bb = FF1(bb, cc, dd, aa, X[13], 9); + aa = FF1(aa, bb, cc, dd, X[ 9], 12); + dd = FF1(dd, aa, bb, cc, X[ 7], 5); + cc = FF1(cc, dd, aa, bb, X[10], 15); + bb = FF1(bb, cc, dd, aa, X[14], 8); + + t = d; d = dd; dd = t; + + H0 += a; + H1 += b; + H2 += c; + H3 += d; + H4 += aa; + H5 += bb; + H6 += cc; + H7 += 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 RIPEMD256Digest(this); + } + + public void reset(Memoable other) + { + RIPEMD256Digest d = (RIPEMD256Digest)other; + + copyIn(d); + } +} |