diff options
Diffstat (limited to 'Crypto/src/crypto/digests/MD5Digest.cs')
| -rw-r--r-- | Crypto/src/crypto/digests/MD5Digest.cs | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/Crypto/src/crypto/digests/MD5Digest.cs b/Crypto/src/crypto/digests/MD5Digest.cs new file mode 100644 index 000000000..50d93e4f8 --- /dev/null +++ b/Crypto/src/crypto/digests/MD5Digest.cs @@ -0,0 +1,301 @@ +using System; + +namespace Org.BouncyCastle.Crypto.Digests +{ + /** + * implementation of MD5 as outlined in "Handbook of Applied Cryptography", pages 346 - 347. + */ + public class MD5Digest + : GeneralDigest + { + private const int DigestLength = 16; + + private int H1, H2, H3, H4; // IV's + + private int[] X = new int[16]; + private int xOff; + + public MD5Digest() + { + Reset(); + } + + /** + * Copy constructor. This will copy the state of the provided + * message digest. + */ + public MD5Digest(MD5Digest t) + : base(t) + { + H1 = t.H1; + H2 = t.H2; + H3 = t.H3; + H4 = t.H4; + + Array.Copy(t.X, 0, X, 0, t.X.Length); + xOff = t.xOff; + } + + public override string AlgorithmName + { + get { return "MD5"; } + } + + public override int GetDigestSize() + { + return DigestLength; + } + + internal override void ProcessWord( + byte[] input, + int inOff) + { + X[xOff++] = (input[inOff] & 0xff) | ((input[inOff + 1] & 0xff) << 8) + | ((input[inOff + 2] & 0xff) << 16) | ((input[inOff + 3] & 0xff) << 24); + + if (xOff == 16) + { + ProcessBlock(); + } + } + + internal override void ProcessLength( + long bitLength) + { + if (xOff > 14) + { + ProcessBlock(); + } + + X[14] = (int)(bitLength & 0xffffffff); + X[15] = (int)((ulong) bitLength >> 32); + } + + private void UnpackWord( + int word, + byte[] outBytes, + int outOff) + { + outBytes[outOff] = (byte)word; + outBytes[outOff + 1] = (byte)((uint) word >> 8); + outBytes[outOff + 2] = (byte)((uint) word >> 16); + outBytes[outOff + 3] = (byte)((uint) word >> 24); + } + + public override int DoFinal( + byte[] output, + int outOff) + { + Finish(); + + UnpackWord(H1, output, outOff); + UnpackWord(H2, output, outOff + 4); + UnpackWord(H3, output, outOff + 8); + UnpackWord(H4, output, outOff + 12); + + Reset(); + + return DigestLength; + } + + /** + * reset the chaining variables to the IV values. + */ + public override void Reset() + { + base.Reset(); + + H1 = unchecked((int) 0x67452301); + H2 = unchecked((int) 0xefcdab89); + H3 = unchecked((int) 0x98badcfe); + H4 = unchecked((int) 0x10325476); + + xOff = 0; + + for (int i = 0; i != X.Length; i++) + { + X[i] = 0; + } + } + + // + // round 1 left rotates + // + private static readonly int S11 = 7; + private static readonly int S12 = 12; + private static readonly int S13 = 17; + private static readonly int S14 = 22; + + // + // round 2 left rotates + // + private static readonly int S21 = 5; + private static readonly int S22 = 9; + private static readonly int S23 = 14; + private static readonly int S24 = 20; + + // + // round 3 left rotates + // + private static readonly int S31 = 4; + private static readonly int S32 = 11; + private static readonly int S33 = 16; + private static readonly int S34 = 23; + + // + // round 4 left rotates + // + private static readonly int S41 = 6; + private static readonly int S42 = 10; + private static readonly int S43 = 15; + private static readonly int S44 = 21; + + /* + * rotate int x left n bits. + */ + private int RotateLeft( + int x, + int n) + { + return (x << n) | (int) ((uint) 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); + } + + internal override 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] + unchecked((int) 0xd76aa478)), S11) + b; + d = RotateLeft((d + F(a, b, c) + X[ 1] + unchecked((int) 0xe8c7b756)), S12) + a; + c = RotateLeft((c + F(d, a, b) + X[ 2] + unchecked((int) 0x242070db)), S13) + d; + b = RotateLeft((b + F(c, d, a) + X[ 3] + unchecked((int) 0xc1bdceee)), S14) + c; + a = RotateLeft((a + F(b, c, d) + X[ 4] + unchecked((int) 0xf57c0faf)), S11) + b; + d = RotateLeft((d + F(a, b, c) + X[ 5] + unchecked((int) 0x4787c62a)), S12) + a; + c = RotateLeft((c + F(d, a, b) + X[ 6] + unchecked((int) 0xa8304613)), S13) + d; + b = RotateLeft((b + F(c, d, a) + X[ 7] + unchecked((int) 0xfd469501)), S14) + c; + a = RotateLeft((a + F(b, c, d) + X[ 8] + unchecked((int) 0x698098d8)), S11) + b; + d = RotateLeft((d + F(a, b, c) + X[ 9] + unchecked((int) 0x8b44f7af)), S12) + a; + c = RotateLeft((c + F(d, a, b) + X[10] + unchecked((int) 0xffff5bb1)), S13) + d; + b = RotateLeft((b + F(c, d, a) + X[11] + unchecked((int) 0x895cd7be)), S14) + c; + a = RotateLeft((a + F(b, c, d) + X[12] + unchecked((int) 0x6b901122)), S11) + b; + d = RotateLeft((d + F(a, b, c) + X[13] + unchecked((int) 0xfd987193)), S12) + a; + c = RotateLeft((c + F(d, a, b) + X[14] + unchecked((int) 0xa679438e)), S13) + d; + b = RotateLeft((b + F(c, d, a) + X[15] + unchecked((int) 0x49b40821)), S14) + c; + + // + // Round 2 - G cycle, 16 times. + // + a = RotateLeft((a + G(b, c, d) + X[ 1] + unchecked((int) 0xf61e2562)), S21) + b; + d = RotateLeft((d + G(a, b, c) + X[ 6] + unchecked((int) 0xc040b340)), S22) + a; + c = RotateLeft((c + G(d, a, b) + X[11] + unchecked((int) 0x265e5a51)), S23) + d; + b = RotateLeft((b + G(c, d, a) + X[ 0] + unchecked((int) 0xe9b6c7aa)), S24) + c; + a = RotateLeft((a + G(b, c, d) + X[ 5] + unchecked((int) 0xd62f105d)), S21) + b; + d = RotateLeft((d + G(a, b, c) + X[10] + unchecked((int) 0x02441453)), S22) + a; + c = RotateLeft((c + G(d, a, b) + X[15] + unchecked((int) 0xd8a1e681)), S23) + d; + b = RotateLeft((b + G(c, d, a) + X[ 4] + unchecked((int) 0xe7d3fbc8)), S24) + c; + a = RotateLeft((a + G(b, c, d) + X[ 9] + unchecked((int) 0x21e1cde6)), S21) + b; + d = RotateLeft((d + G(a, b, c) + X[14] + unchecked((int) 0xc33707d6)), S22) + a; + c = RotateLeft((c + G(d, a, b) + X[ 3] + unchecked((int) 0xf4d50d87)), S23) + d; + b = RotateLeft((b + G(c, d, a) + X[ 8] + unchecked((int) 0x455a14ed)), S24) + c; + a = RotateLeft((a + G(b, c, d) + X[13] + unchecked((int) 0xa9e3e905)), S21) + b; + d = RotateLeft((d + G(a, b, c) + X[ 2] + unchecked((int) 0xfcefa3f8)), S22) + a; + c = RotateLeft((c + G(d, a, b) + X[ 7] + unchecked((int) 0x676f02d9)), S23) + d; + b = RotateLeft((b + G(c, d, a) + X[12] + unchecked((int) 0x8d2a4c8a)), S24) + c; + + // + // Round 3 - H cycle, 16 times. + // + a = RotateLeft((a + H(b, c, d) + X[ 5] + unchecked((int) 0xfffa3942)), S31) + b; + d = RotateLeft((d + H(a, b, c) + X[ 8] + unchecked((int) 0x8771f681)), S32) + a; + c = RotateLeft((c + H(d, a, b) + X[11] + unchecked((int) 0x6d9d6122)), S33) + d; + b = RotateLeft((b + H(c, d, a) + X[14] + unchecked((int) 0xfde5380c)), S34) + c; + a = RotateLeft((a + H(b, c, d) + X[ 1] + unchecked((int) 0xa4beea44)), S31) + b; + d = RotateLeft((d + H(a, b, c) + X[ 4] + unchecked((int) 0x4bdecfa9)), S32) + a; + c = RotateLeft((c + H(d, a, b) + X[ 7] + unchecked((int) 0xf6bb4b60)), S33) + d; + b = RotateLeft((b + H(c, d, a) + X[10] + unchecked((int) 0xbebfbc70)), S34) + c; + a = RotateLeft((a + H(b, c, d) + X[13] + unchecked((int) 0x289b7ec6)), S31) + b; + d = RotateLeft((d + H(a, b, c) + X[ 0] + unchecked((int) 0xeaa127fa)), S32) + a; + c = RotateLeft((c + H(d, a, b) + X[ 3] + unchecked((int) 0xd4ef3085)), S33) + d; + b = RotateLeft((b + H(c, d, a) + X[ 6] + unchecked((int) 0x04881d05)), S34) + c; + a = RotateLeft((a + H(b, c, d) + X[ 9] + unchecked((int) 0xd9d4d039)), S31) + b; + d = RotateLeft((d + H(a, b, c) + X[12] + unchecked((int) 0xe6db99e5)), S32) + a; + c = RotateLeft((c + H(d, a, b) + X[15] + unchecked((int) 0x1fa27cf8)), S33) + d; + b = RotateLeft((b + H(c, d, a) + X[ 2] + unchecked((int) 0xc4ac5665)), S34) + c; + + // + // Round 4 - K cycle, 16 times. + // + a = RotateLeft((a + K(b, c, d) + X[ 0] + unchecked((int) 0xf4292244)), S41) + b; + d = RotateLeft((d + K(a, b, c) + X[ 7] + unchecked((int) 0x432aff97)), S42) + a; + c = RotateLeft((c + K(d, a, b) + X[14] + unchecked((int) 0xab9423a7)), S43) + d; + b = RotateLeft((b + K(c, d, a) + X[ 5] + unchecked((int) 0xfc93a039)), S44) + c; + a = RotateLeft((a + K(b, c, d) + X[12] + unchecked((int) 0x655b59c3)), S41) + b; + d = RotateLeft((d + K(a, b, c) + X[ 3] + unchecked((int) 0x8f0ccc92)), S42) + a; + c = RotateLeft((c + K(d, a, b) + X[10] + unchecked((int) 0xffeff47d)), S43) + d; + b = RotateLeft((b + K(c, d, a) + X[ 1] + unchecked((int) 0x85845dd1)), S44) + c; + a = RotateLeft((a + K(b, c, d) + X[ 8] + unchecked((int) 0x6fa87e4f)), S41) + b; + d = RotateLeft((d + K(a, b, c) + X[15] + unchecked((int) 0xfe2ce6e0)), S42) + a; + c = RotateLeft((c + K(d, a, b) + X[ 6] + unchecked((int) 0xa3014314)), S43) + d; + b = RotateLeft((b + K(c, d, a) + X[13] + unchecked((int) 0x4e0811a1)), S44) + c; + a = RotateLeft((a + K(b, c, d) + X[ 4] + unchecked((int) 0xf7537e82)), S41) + b; + d = RotateLeft((d + K(a, b, c) + X[11] + unchecked((int) 0xbd3af235)), S42) + a; + c = RotateLeft((c + K(d, a, b) + X[ 2] + unchecked((int) 0x2ad7d2bb)), S43) + d; + b = RotateLeft((b + K(c, d, a) + X[ 9] + unchecked((int) 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; + } + } + } + +} |