diff options
Diffstat (limited to 'core/src/main/java/org/bouncycastle/crypto/digests/MD5Digest.java')
-rw-r--r-- | core/src/main/java/org/bouncycastle/crypto/digests/MD5Digest.java | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/core/src/main/java/org/bouncycastle/crypto/digests/MD5Digest.java b/core/src/main/java/org/bouncycastle/crypto/digests/MD5Digest.java new file mode 100644 index 00000000..ff9cedf0 --- /dev/null +++ b/core/src/main/java/org/bouncycastle/crypto/digests/MD5Digest.java @@ -0,0 +1,323 @@ +package org.bouncycastle.crypto.digests; + + +import org.bouncycastle.util.Memoable; + +/** + * implementation of MD5 as outlined in "Handbook of Applied Cryptography", pages 346 - 347. + */ +public class MD5Digest + extends GeneralDigest +{ + private static final int DIGEST_LENGTH = 16; + + private int H1, H2, H3, H4; // IV's + + private int[] X = new int[16]; + private int xOff; + + /** + * Standard constructor + */ + public MD5Digest() + { + reset(); + } + + /** + * Copy constructor. This will copy the state of the provided + * message digest. + */ + public MD5Digest(MD5Digest t) + { + super(t); + + copyIn(t); + } + + private void copyIn(MD5Digest t) + { + super.copyIn(t); + + 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 "MD5"; + } + + 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(H1, out, outOff); + unpackWord(H2, out, outOff + 4); + unpackWord(H3, out, outOff + 8); + unpackWord(H4, out, outOff + 12); + + reset(); + + return DIGEST_LENGTH; + } + + /** + * reset the chaining variables to the IV values. + */ + public void reset() + { + super.reset(); + + H1 = 0x67452301; + H2 = 0xefcdab89; + H3 = 0x98badcfe; + H4 = 0x10325476; + + xOff = 0; + + for (int i = 0; i != X.length; i++) + { + X[i] = 0; + } + } + + // + // round 1 left rotates + // + private static final int S11 = 7; + private static final int S12 = 12; + private static final int S13 = 17; + private static final int S14 = 22; + + // + // round 2 left rotates + // + private static final int S21 = 5; + private static final int S22 = 9; + private static final int S23 = 14; + private static final int S24 = 20; + + // + // round 3 left rotates + // + private static final int S31 = 4; + private static final int S32 = 11; + private static final int S33 = 16; + private static final int S34 = 23; + + // + // round 4 left rotates + // + private static final int S41 = 6; + private static final int S42 = 10; + private static final int S43 = 15; + private static final int S44 = 21; + + /* + * rotate int x left n bits. + */ + private int rotateLeft( + int x, + int n) + { + return (x << n) | (x >>> (32 - n)); + } + + /* + * F, G, H and I are the basic MD5 functions. + */ + private int F( + int u, + int v, + int w) + { + return (u & v) | (~u & w); + } + + private int G( + int u, + int v, + int w) + { + return (u & w) | (v & ~w); + } + + private int H( + int u, + int v, + int w) + { + return u ^ v ^ w; + } + + private int K( + int u, + int v, + int w) + { + return v ^ (u | ~w); + } + + protected void processBlock() + { + int a = H1; + int b = H2; + int c = H3; + int d = H4; + + // + // Round 1 - F cycle, 16 times. + // + a = rotateLeft(a + F(b, c, d) + X[ 0] + 0xd76aa478, S11) + b; + d = rotateLeft(d + F(a, b, c) + X[ 1] + 0xe8c7b756, S12) + a; + c = rotateLeft(c + F(d, a, b) + X[ 2] + 0x242070db, S13) + d; + b = rotateLeft(b + F(c, d, a) + X[ 3] + 0xc1bdceee, S14) + c; + a = rotateLeft(a + F(b, c, d) + X[ 4] + 0xf57c0faf, S11) + b; + d = rotateLeft(d + F(a, b, c) + X[ 5] + 0x4787c62a, S12) + a; + c = rotateLeft(c + F(d, a, b) + X[ 6] + 0xa8304613, S13) + d; + b = rotateLeft(b + F(c, d, a) + X[ 7] + 0xfd469501, S14) + c; + a = rotateLeft(a + F(b, c, d) + X[ 8] + 0x698098d8, S11) + b; + d = rotateLeft(d + F(a, b, c) + X[ 9] + 0x8b44f7af, S12) + a; + c = rotateLeft(c + F(d, a, b) + X[10] + 0xffff5bb1, S13) + d; + b = rotateLeft(b + F(c, d, a) + X[11] + 0x895cd7be, S14) + c; + a = rotateLeft(a + F(b, c, d) + X[12] + 0x6b901122, S11) + b; + d = rotateLeft(d + F(a, b, c) + X[13] + 0xfd987193, S12) + a; + c = rotateLeft(c + F(d, a, b) + X[14] + 0xa679438e, S13) + d; + b = rotateLeft(b + F(c, d, a) + X[15] + 0x49b40821, S14) + c; + + // + // Round 2 - G cycle, 16 times. + // + a = rotateLeft(a + G(b, c, d) + X[ 1] + 0xf61e2562, S21) + b; + d = rotateLeft(d + G(a, b, c) + X[ 6] + 0xc040b340, S22) + a; + c = rotateLeft(c + G(d, a, b) + X[11] + 0x265e5a51, S23) + d; + b = rotateLeft(b + G(c, d, a) + X[ 0] + 0xe9b6c7aa, S24) + c; + a = rotateLeft(a + G(b, c, d) + X[ 5] + 0xd62f105d, S21) + b; + d = rotateLeft(d + G(a, b, c) + X[10] + 0x02441453, S22) + a; + c = rotateLeft(c + G(d, a, b) + X[15] + 0xd8a1e681, S23) + d; + b = rotateLeft(b + G(c, d, a) + X[ 4] + 0xe7d3fbc8, S24) + c; + a = rotateLeft(a + G(b, c, d) + X[ 9] + 0x21e1cde6, S21) + b; + d = rotateLeft(d + G(a, b, c) + X[14] + 0xc33707d6, S22) + a; + c = rotateLeft(c + G(d, a, b) + X[ 3] + 0xf4d50d87, S23) + d; + b = rotateLeft(b + G(c, d, a) + X[ 8] + 0x455a14ed, S24) + c; + a = rotateLeft(a + G(b, c, d) + X[13] + 0xa9e3e905, S21) + b; + d = rotateLeft(d + G(a, b, c) + X[ 2] + 0xfcefa3f8, S22) + a; + c = rotateLeft(c + G(d, a, b) + X[ 7] + 0x676f02d9, S23) + d; + b = rotateLeft(b + G(c, d, a) + X[12] + 0x8d2a4c8a, S24) + c; + + // + // Round 3 - H cycle, 16 times. + // + a = rotateLeft(a + H(b, c, d) + X[ 5] + 0xfffa3942, S31) + b; + d = rotateLeft(d + H(a, b, c) + X[ 8] + 0x8771f681, S32) + a; + c = rotateLeft(c + H(d, a, b) + X[11] + 0x6d9d6122, S33) + d; + b = rotateLeft(b + H(c, d, a) + X[14] + 0xfde5380c, S34) + c; + a = rotateLeft(a + H(b, c, d) + X[ 1] + 0xa4beea44, S31) + b; + d = rotateLeft(d + H(a, b, c) + X[ 4] + 0x4bdecfa9, S32) + a; + c = rotateLeft(c + H(d, a, b) + X[ 7] + 0xf6bb4b60, S33) + d; + b = rotateLeft(b + H(c, d, a) + X[10] + 0xbebfbc70, S34) + c; + a = rotateLeft(a + H(b, c, d) + X[13] + 0x289b7ec6, S31) + b; + d = rotateLeft(d + H(a, b, c) + X[ 0] + 0xeaa127fa, S32) + a; + c = rotateLeft(c + H(d, a, b) + X[ 3] + 0xd4ef3085, S33) + d; + b = rotateLeft(b + H(c, d, a) + X[ 6] + 0x04881d05, S34) + c; + a = rotateLeft(a + H(b, c, d) + X[ 9] + 0xd9d4d039, S31) + b; + d = rotateLeft(d + H(a, b, c) + X[12] + 0xe6db99e5, S32) + a; + c = rotateLeft(c + H(d, a, b) + X[15] + 0x1fa27cf8, S33) + d; + b = rotateLeft(b + H(c, d, a) + X[ 2] + 0xc4ac5665, S34) + c; + + // + // Round 4 - K cycle, 16 times. + // + a = rotateLeft(a + K(b, c, d) + X[ 0] + 0xf4292244, S41) + b; + d = rotateLeft(d + K(a, b, c) + X[ 7] + 0x432aff97, S42) + a; + c = rotateLeft(c + K(d, a, b) + X[14] + 0xab9423a7, S43) + d; + b = rotateLeft(b + K(c, d, a) + X[ 5] + 0xfc93a039, S44) + c; + a = rotateLeft(a + K(b, c, d) + X[12] + 0x655b59c3, S41) + b; + d = rotateLeft(d + K(a, b, c) + X[ 3] + 0x8f0ccc92, S42) + a; + c = rotateLeft(c + K(d, a, b) + X[10] + 0xffeff47d, S43) + d; + b = rotateLeft(b + K(c, d, a) + X[ 1] + 0x85845dd1, S44) + c; + a = rotateLeft(a + K(b, c, d) + X[ 8] + 0x6fa87e4f, S41) + b; + d = rotateLeft(d + K(a, b, c) + X[15] + 0xfe2ce6e0, S42) + a; + c = rotateLeft(c + K(d, a, b) + X[ 6] + 0xa3014314, S43) + d; + b = rotateLeft(b + K(c, d, a) + X[13] + 0x4e0811a1, S44) + c; + a = rotateLeft(a + K(b, c, d) + X[ 4] + 0xf7537e82, S41) + b; + d = rotateLeft(d + K(a, b, c) + X[11] + 0xbd3af235, S42) + a; + c = rotateLeft(c + K(d, a, b) + X[ 2] + 0x2ad7d2bb, S43) + d; + b = rotateLeft(b + K(c, d, a) + X[ 9] + 0xeb86d391, S44) + c; + + H1 += a; + H2 += b; + H3 += c; + H4 += d; + + // + // 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 MD5Digest(this); + } + + public void reset(Memoable other) + { + MD5Digest d = (MD5Digest)other; + + copyIn(d); + } +} |