diff options
Diffstat (limited to 'Crypto/src/crypto/digests/LongDigest.cs')
| -rw-r--r-- | Crypto/src/crypto/digests/LongDigest.cs | 346 |
1 files changed, 346 insertions, 0 deletions
diff --git a/Crypto/src/crypto/digests/LongDigest.cs b/Crypto/src/crypto/digests/LongDigest.cs new file mode 100644 index 000000000..702753b2b --- /dev/null +++ b/Crypto/src/crypto/digests/LongDigest.cs @@ -0,0 +1,346 @@ +using System; + +using Org.BouncyCastle.Crypto; +using Org.BouncyCastle.Crypto.Utilities; + +namespace Org.BouncyCastle.Crypto.Digests +{ + /** + * Base class for SHA-384 and SHA-512. + */ + public abstract class LongDigest + : IDigest + { + private int MyByteLength = 128; + + private byte[] xBuf; + private int xBufOff; + + private long byteCount1; + private long byteCount2; + + internal ulong H1, H2, H3, H4, H5, H6, H7, H8; + + private ulong[] W = new ulong[80]; + private int wOff; + + /** + * Constructor for variable length word + */ + internal LongDigest() + { + xBuf = new byte[8]; + + Reset(); + } + + /** + * Copy constructor. We are using copy constructors in place + * of the object.Clone() interface as this interface is not + * supported by J2ME. + */ + internal LongDigest( + LongDigest t) + { + xBuf = new byte[t.xBuf.Length]; + Array.Copy(t.xBuf, 0, xBuf, 0, t.xBuf.Length); + + xBufOff = t.xBufOff; + byteCount1 = t.byteCount1; + byteCount2 = t.byteCount2; + + H1 = t.H1; + H2 = t.H2; + H3 = t.H3; + H4 = t.H4; + H5 = t.H5; + H6 = t.H6; + H7 = t.H7; + H8 = t.H8; + + Array.Copy(t.W, 0, W, 0, t.W.Length); + wOff = t.wOff; + } + + public void Update( + byte input) + { + xBuf[xBufOff++] = input; + + if (xBufOff == xBuf.Length) + { + ProcessWord(xBuf, 0); + xBufOff = 0; + } + + byteCount1++; + } + + public void BlockUpdate( + byte[] input, + int inOff, + int length) + { + // + // fill the current word + // + while ((xBufOff != 0) && (length > 0)) + { + Update(input[inOff]); + + inOff++; + length--; + } + + // + // process whole words. + // + while (length > xBuf.Length) + { + ProcessWord(input, inOff); + + inOff += xBuf.Length; + length -= xBuf.Length; + byteCount1 += xBuf.Length; + } + + // + // load in the remainder. + // + while (length > 0) + { + Update(input[inOff]); + + inOff++; + length--; + } + } + + public void Finish() + { + AdjustByteCounts(); + + long lowBitLength = byteCount1 << 3; + long hiBitLength = byteCount2; + + // + // add the pad bytes. + // + Update((byte)128); + + while (xBufOff != 0) + { + Update((byte)0); + } + + ProcessLength(lowBitLength, hiBitLength); + + ProcessBlock(); + } + + public virtual void Reset() + { + byteCount1 = 0; + byteCount2 = 0; + + xBufOff = 0; + for ( int i = 0; i < xBuf.Length; i++ ) + { + xBuf[i] = 0; + } + + wOff = 0; + Array.Clear(W, 0, W.Length); + } + + internal void ProcessWord( + byte[] input, + int inOff) + { + W[wOff] = Pack.BE_To_UInt64(input, inOff); + + if (++wOff == 16) + { + ProcessBlock(); + } + } + + /** + * adjust the byte counts so that byteCount2 represents the + * upper long (less 3 bits) word of the byte count. + */ + private void AdjustByteCounts() + { + if (byteCount1 > 0x1fffffffffffffffL) + { + byteCount2 += (long) ((ulong) byteCount1 >> 61); + byteCount1 &= 0x1fffffffffffffffL; + } + } + + internal void ProcessLength( + long lowW, + long hiW) + { + if (wOff > 14) + { + ProcessBlock(); + } + + W[14] = (ulong)hiW; + W[15] = (ulong)lowW; + } + + internal void ProcessBlock() + { + AdjustByteCounts(); + + // + // expand 16 word block into 80 word blocks. + // + for (int ti = 16; ti <= 79; ++ti) + { + W[ti] = Sigma1(W[ti - 2]) + W[ti - 7] + Sigma0(W[ti - 15]) + W[ti - 16]; + } + + // + // set up working variables. + // + ulong a = H1; + ulong b = H2; + ulong c = H3; + ulong d = H4; + ulong e = H5; + ulong f = H6; + ulong g = H7; + ulong h = H8; + + int t = 0; + for(int i = 0; i < 10; i ++) + { + // t = 8 * i + h += Sum1(e) + Ch(e, f, g) + K[t] + W[t++]; + d += h; + h += Sum0(a) + Maj(a, b, c); + + // t = 8 * i + 1 + g += Sum1(d) + Ch(d, e, f) + K[t] + W[t++]; + c += g; + g += Sum0(h) + Maj(h, a, b); + + // t = 8 * i + 2 + f += Sum1(c) + Ch(c, d, e) + K[t] + W[t++]; + b += f; + f += Sum0(g) + Maj(g, h, a); + + // t = 8 * i + 3 + e += Sum1(b) + Ch(b, c, d) + K[t] + W[t++]; + a += e; + e += Sum0(f) + Maj(f, g, h); + + // t = 8 * i + 4 + d += Sum1(a) + Ch(a, b, c) + K[t] + W[t++]; + h += d; + d += Sum0(e) + Maj(e, f, g); + + // t = 8 * i + 5 + c += Sum1(h) + Ch(h, a, b) + K[t] + W[t++]; + g += c; + c += Sum0(d) + Maj(d, e, f); + + // t = 8 * i + 6 + b += Sum1(g) + Ch(g, h, a) + K[t] + W[t++]; + f += b; + b += Sum0(c) + Maj(c, d, e); + + // t = 8 * i + 7 + a += Sum1(f) + Ch(f, g, h) + K[t] + W[t++]; + e += a; + a += Sum0(b) + Maj(b, c, d); + } + + H1 += a; + H2 += b; + H3 += c; + H4 += d; + H5 += e; + H6 += f; + H7 += g; + H8 += h; + + // + // reset the offset and clean out the word buffer. + // + wOff = 0; + Array.Clear(W, 0, 16); + } + + /* SHA-384 and SHA-512 functions (as for SHA-256 but for longs) */ + private static ulong Ch(ulong x, ulong y, ulong z) + { + return (x & y) ^ (~x & z); + } + + private static ulong Maj(ulong x, ulong y, ulong z) + { + return (x & y) ^ (x & z) ^ (y & z); + } + + private static ulong Sum0(ulong x) + { + return ((x << 36) | (x >> 28)) ^ ((x << 30) | (x >> 34)) ^ ((x << 25) | (x >> 39)); + } + + private static ulong Sum1(ulong x) + { + return ((x << 50) | (x >> 14)) ^ ((x << 46) | (x >> 18)) ^ ((x << 23) | (x >> 41)); + } + + private static ulong Sigma0(ulong x) + { + return ((x << 63) | (x >> 1)) ^ ((x << 56) | (x >> 8)) ^ (x >> 7); + } + + private static ulong Sigma1(ulong x) + { + return ((x << 45) | (x >> 19)) ^ ((x << 3) | (x >> 61)) ^ (x >> 6); + } + + /* SHA-384 and SHA-512 Constants + * (represent the first 64 bits of the fractional parts of the + * cube roots of the first sixty-four prime numbers) + */ + internal static readonly ulong[] K = + { + 0x428a2f98d728ae22, 0x7137449123ef65cd, 0xb5c0fbcfec4d3b2f, 0xe9b5dba58189dbbc, + 0x3956c25bf348b538, 0x59f111f1b605d019, 0x923f82a4af194f9b, 0xab1c5ed5da6d8118, + 0xd807aa98a3030242, 0x12835b0145706fbe, 0x243185be4ee4b28c, 0x550c7dc3d5ffb4e2, + 0x72be5d74f27b896f, 0x80deb1fe3b1696b1, 0x9bdc06a725c71235, 0xc19bf174cf692694, + 0xe49b69c19ef14ad2, 0xefbe4786384f25e3, 0x0fc19dc68b8cd5b5, 0x240ca1cc77ac9c65, + 0x2de92c6f592b0275, 0x4a7484aa6ea6e483, 0x5cb0a9dcbd41fbd4, 0x76f988da831153b5, + 0x983e5152ee66dfab, 0xa831c66d2db43210, 0xb00327c898fb213f, 0xbf597fc7beef0ee4, + 0xc6e00bf33da88fc2, 0xd5a79147930aa725, 0x06ca6351e003826f, 0x142929670a0e6e70, + 0x27b70a8546d22ffc, 0x2e1b21385c26c926, 0x4d2c6dfc5ac42aed, 0x53380d139d95b3df, + 0x650a73548baf63de, 0x766a0abb3c77b2a8, 0x81c2c92e47edaee6, 0x92722c851482353b, + 0xa2bfe8a14cf10364, 0xa81a664bbc423001, 0xc24b8b70d0f89791, 0xc76c51a30654be30, + 0xd192e819d6ef5218, 0xd69906245565a910, 0xf40e35855771202a, 0x106aa07032bbd1b8, + 0x19a4c116b8d2d0c8, 0x1e376c085141ab53, 0x2748774cdf8eeb99, 0x34b0bcb5e19b48a8, + 0x391c0cb3c5c95a63, 0x4ed8aa4ae3418acb, 0x5b9cca4f7763e373, 0x682e6ff3d6b2b8a3, + 0x748f82ee5defb2fc, 0x78a5636f43172f60, 0x84c87814a1f0ab72, 0x8cc702081a6439ec, + 0x90befffa23631e28, 0xa4506cebde82bde9, 0xbef9a3f7b2c67915, 0xc67178f2e372532b, + 0xca273eceea26619c, 0xd186b8c721c0c207, 0xeada7dd6cde0eb1e, 0xf57d4f7fee6ed178, + 0x06f067aa72176fba, 0x0a637dc5a2c898a6, 0x113f9804bef90dae, 0x1b710b35131c471b, + 0x28db77f523047d84, 0x32caab7b40c72493, 0x3c9ebe0a15c9bebc, 0x431d67c49c100d4c, + 0x4cc5d4becb3e42b6, 0x597f299cfc657e2a, 0x5fcb6fab3ad6faec, 0x6c44198c4a475817 + }; + + public int GetByteLength() + { + return MyByteLength; + } + + public abstract string AlgorithmName { get; } + public abstract int GetDigestSize(); + public abstract int DoFinal(byte[] output, int outOff); + } +} |