381 lines
12 KiB
C#
381 lines
12 KiB
C#
using System;
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using Org.BouncyCastle.Crypto;
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namespace Org.BouncyCastle.Crypto.Digests
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{
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/**
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* Base class for SHA-384 and SHA-512.
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*/
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public abstract class LongDigest
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: IDigest
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{
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private int MyByteLength = 128;
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private byte[] xBuf;
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private int xBufOff;
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private long byteCount1;
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private long byteCount2;
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internal long H1, H2, H3, H4, H5, H6, H7, H8;
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private long[] W = new long[80];
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private int wOff;
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/**
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* Constructor for variable length word
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*/
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internal LongDigest()
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{
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xBuf = new byte[8];
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Reset();
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}
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/**
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* Copy constructor. We are using copy constructors in place
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* of the object.Clone() interface as this interface is not
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* supported by J2ME.
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*/
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internal LongDigest(
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LongDigest t)
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{
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xBuf = new byte[t.xBuf.Length];
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Array.Copy(t.xBuf, 0, xBuf, 0, t.xBuf.Length);
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xBufOff = t.xBufOff;
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byteCount1 = t.byteCount1;
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byteCount2 = t.byteCount2;
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H1 = t.H1;
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H2 = t.H2;
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H3 = t.H3;
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H4 = t.H4;
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H5 = t.H5;
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H6 = t.H6;
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H7 = t.H7;
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H8 = t.H8;
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Array.Copy(t.W, 0, W, 0, t.W.Length);
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wOff = t.wOff;
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}
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public void Update(
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byte input)
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{
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xBuf[xBufOff++] = input;
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if (xBufOff == xBuf.Length)
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{
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ProcessWord(xBuf, 0);
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xBufOff = 0;
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}
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byteCount1++;
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}
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public void BlockUpdate(
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byte[] input,
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int inOff,
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int length)
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{
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//
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// fill the current word
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//
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while ((xBufOff != 0) && (length > 0))
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{
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Update(input[inOff]);
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inOff++;
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length--;
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}
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//
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// process whole words.
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//
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while (length > xBuf.Length)
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{
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ProcessWord(input, inOff);
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inOff += xBuf.Length;
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length -= xBuf.Length;
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byteCount1 += xBuf.Length;
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}
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//
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// load in the remainder.
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//
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while (length > 0)
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{
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Update(input[inOff]);
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inOff++;
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length--;
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}
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}
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public void Finish()
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{
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AdjustByteCounts();
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long lowBitLength = byteCount1 << 3;
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long hiBitLength = byteCount2;
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//
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// add the pad bytes.
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//
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Update((byte)128);
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while (xBufOff != 0)
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{
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Update((byte)0);
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}
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ProcessLength(lowBitLength, hiBitLength);
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ProcessBlock();
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}
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public virtual void Reset()
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{
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byteCount1 = 0;
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byteCount2 = 0;
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xBufOff = 0;
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for ( int i = 0; i < xBuf.Length; i++ )
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{
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xBuf[i] = 0;
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}
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wOff = 0;
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for (int i = 0; i != W.Length; i++)
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{
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W[i] = 0;
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}
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}
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internal void ProcessWord(
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byte[] input,
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int inOff)
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{
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W[wOff++] = ((long)(input[inOff] & 0xff) << 56)
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| ((long)(input[inOff + 1] & 0xff) << 48)
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| ((long)(input[inOff + 2] & 0xff) << 40)
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| ((long)(input[inOff + 3] & 0xff) << 32)
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| ((long)(input[inOff + 4] & 0xff) << 24)
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| ((long)(input[inOff + 5] & 0xff) << 16)
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| ((long)(input[inOff + 6] & 0xff) << 8)
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| ((uint)(input[inOff + 7] & 0xff) );
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if (wOff == 16)
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{
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ProcessBlock();
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}
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}
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internal static void UnpackWord(
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long word,
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byte[] outBytes,
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int outOff)
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{
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outBytes[outOff] = (byte)((ulong) word >> 56);
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outBytes[outOff + 1] = (byte)((ulong) word >> 48);
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outBytes[outOff + 2] = (byte)((ulong) word >> 40);
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outBytes[outOff + 3] = (byte)((ulong) word >> 32);
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outBytes[outOff + 4] = (byte)((ulong) word >> 24);
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outBytes[outOff + 5] = (byte)((ulong) word >> 16);
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outBytes[outOff + 6] = (byte)((ulong) word >> 8);
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outBytes[outOff + 7] = (byte)word;
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}
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/**
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* adjust the byte counts so that byteCount2 represents the
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* upper long (less 3 bits) word of the byte count.
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*/
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private void AdjustByteCounts()
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{
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if (byteCount1 > 0x1fffffffffffffffL)
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{
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byteCount2 += (long) ((ulong) byteCount1 >> 61);
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byteCount1 &= 0x1fffffffffffffffL;
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}
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}
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internal void ProcessLength(
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long lowW,
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long hiW)
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{
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if (wOff > 14)
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{
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ProcessBlock();
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}
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W[14] = hiW;
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W[15] = lowW;
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}
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internal void ProcessBlock()
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{
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AdjustByteCounts();
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//
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// expand 16 word block into 80 word blocks.
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//
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for (int ti = 16; ti <= 79; ++ti)
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{
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W[ti] = Sigma1(W[ti - 2]) + W[ti - 7] + Sigma0(W[ti - 15]) + W[ti - 16];
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}
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//
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// set up working variables.
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//
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long a = H1;
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long b = H2;
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long c = H3;
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long d = H4;
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long e = H5;
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long f = H6;
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long g = H7;
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long h = H8;
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int t = 0;
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for(int i = 0; i < 10; i ++)
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{
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// t = 8 * i
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h += Sum1(e) + Ch(e, f, g) + K[t] + W[t++];
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d += h;
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h += Sum0(a) + Maj(a, b, c);
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// t = 8 * i + 1
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g += Sum1(d) + Ch(d, e, f) + K[t] + W[t++];
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c += g;
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g += Sum0(h) + Maj(h, a, b);
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// t = 8 * i + 2
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f += Sum1(c) + Ch(c, d, e) + K[t] + W[t++];
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b += f;
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f += Sum0(g) + Maj(g, h, a);
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// t = 8 * i + 3
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e += Sum1(b) + Ch(b, c, d) + K[t] + W[t++];
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a += e;
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e += Sum0(f) + Maj(f, g, h);
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// t = 8 * i + 4
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d += Sum1(a) + Ch(a, b, c) + K[t] + W[t++];
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h += d;
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d += Sum0(e) + Maj(e, f, g);
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// t = 8 * i + 5
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c += Sum1(h) + Ch(h, a, b) + K[t] + W[t++];
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g += c;
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c += Sum0(d) + Maj(d, e, f);
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// t = 8 * i + 6
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b += Sum1(g) + Ch(g, h, a) + K[t] + W[t++];
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f += b;
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b += Sum0(c) + Maj(c, d, e);
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// t = 8 * i + 7
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a += Sum1(f) + Ch(f, g, h) + K[t] + W[t++];
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e += a;
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a += Sum0(b) + Maj(b, c, d);
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}
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H1 += a;
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H2 += b;
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H3 += c;
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H4 += d;
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H5 += e;
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H6 += f;
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H7 += g;
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H8 += h;
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//
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// reset the offset and clean out the word buffer.
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//
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wOff = 0;
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Array.Clear(W, 0, 16);
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}
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/* SHA-384 and SHA-512 functions (as for SHA-256 but for longs) */
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private static long Ch(
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long x,
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long y,
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long z)
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{
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return ((x & y) ^ ((~x) & z));
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}
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private static long Maj(
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long x,
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long y,
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long z)
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{
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return ((x & y) ^ (x & z) ^ (y & z));
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}
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private static long Sum0(
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long x)
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{
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return ((x << 36)|((long)((ulong)x >> 28))) ^ ((x << 30)|((long)((ulong)x >> 34))) ^ ((x << 25)|((long)((ulong)x >> 39)));
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}
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private static long Sum1(
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long x)
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{
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return ((x << 50)|((long)((ulong)x >> 14))) ^ ((x << 46)|((long)((ulong)x >> 18))) ^ ((x << 23)|((long)((ulong)x >> 41)));
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}
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private static long Sigma0(
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long x)
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{
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return ((x << 63)|((long)((ulong)x >> 1))) ^ ((x << 56)|((long)((ulong)x >> 8))) ^ ((long)((ulong)x >> 7));
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}
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private static long Sigma1(
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long x)
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{
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return ((x << 45)|((long)((ulong)x >> 19))) ^ ((x << 3)|((long)((ulong)x >> 61))) ^ ((long)((ulong)x >> 6));
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}
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/* SHA-384 and SHA-512 Constants
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* (represent the first 64 bits of the fractional parts of the
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* cube roots of the first sixty-four prime numbers)
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*/
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internal static readonly long[] K =
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{
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unchecked((long) 0x428a2f98d728ae22L), unchecked((long) 0x7137449123ef65cdL), unchecked((long) 0xb5c0fbcfec4d3b2fL), unchecked((long) 0xe9b5dba58189dbbcL),
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unchecked((long) 0x3956c25bf348b538L), unchecked((long) 0x59f111f1b605d019L), unchecked((long) 0x923f82a4af194f9bL), unchecked((long) 0xab1c5ed5da6d8118L),
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unchecked((long) 0xd807aa98a3030242L), unchecked((long) 0x12835b0145706fbeL), unchecked((long) 0x243185be4ee4b28cL), unchecked((long) 0x550c7dc3d5ffb4e2L),
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unchecked((long) 0x72be5d74f27b896fL), unchecked((long) 0x80deb1fe3b1696b1L), unchecked((long) 0x9bdc06a725c71235L), unchecked((long) 0xc19bf174cf692694L),
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unchecked((long) 0xe49b69c19ef14ad2L), unchecked((long) 0xefbe4786384f25e3L), unchecked((long) 0x0fc19dc68b8cd5b5L), unchecked((long) 0x240ca1cc77ac9c65L),
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unchecked((long) 0x2de92c6f592b0275L), unchecked((long) 0x4a7484aa6ea6e483L), unchecked((long) 0x5cb0a9dcbd41fbd4L), unchecked((long) 0x76f988da831153b5L),
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unchecked((long) 0x983e5152ee66dfabL), unchecked((long) 0xa831c66d2db43210L), unchecked((long) 0xb00327c898fb213fL), unchecked((long) 0xbf597fc7beef0ee4L),
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unchecked((long) 0xc6e00bf33da88fc2L), unchecked((long) 0xd5a79147930aa725L), unchecked((long) 0x06ca6351e003826fL), unchecked((long) 0x142929670a0e6e70L),
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unchecked((long) 0x27b70a8546d22ffcL), unchecked((long) 0x2e1b21385c26c926L), unchecked((long) 0x4d2c6dfc5ac42aedL), unchecked((long) 0x53380d139d95b3dfL),
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unchecked((long) 0x650a73548baf63deL), unchecked((long) 0x766a0abb3c77b2a8L), unchecked((long) 0x81c2c92e47edaee6L), unchecked((long) 0x92722c851482353bL),
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unchecked((long) 0xa2bfe8a14cf10364L), unchecked((long) 0xa81a664bbc423001L), unchecked((long) 0xc24b8b70d0f89791L), unchecked((long) 0xc76c51a30654be30L),
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unchecked((long) 0xd192e819d6ef5218L), unchecked((long) 0xd69906245565a910L), unchecked((long) 0xf40e35855771202aL), unchecked((long) 0x106aa07032bbd1b8L),
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unchecked((long) 0x19a4c116b8d2d0c8L), unchecked((long) 0x1e376c085141ab53L), unchecked((long) 0x2748774cdf8eeb99L), unchecked((long) 0x34b0bcb5e19b48a8L),
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unchecked((long) 0x391c0cb3c5c95a63L), unchecked((long) 0x4ed8aa4ae3418acbL), unchecked((long) 0x5b9cca4f7763e373L), unchecked((long) 0x682e6ff3d6b2b8a3L),
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unchecked((long) 0x748f82ee5defb2fcL), unchecked((long) 0x78a5636f43172f60L), unchecked((long) 0x84c87814a1f0ab72L), unchecked((long) 0x8cc702081a6439ecL),
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unchecked((long) 0x90befffa23631e28L), unchecked((long) 0xa4506cebde82bde9L), unchecked((long) 0xbef9a3f7b2c67915L), unchecked((long) 0xc67178f2e372532bL),
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unchecked((long) 0xca273eceea26619cL), unchecked((long) 0xd186b8c721c0c207L), unchecked((long) 0xeada7dd6cde0eb1eL), unchecked((long) 0xf57d4f7fee6ed178L),
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unchecked((long) 0x06f067aa72176fbaL), unchecked((long) 0x0a637dc5a2c898a6L), unchecked((long) 0x113f9804bef90daeL), unchecked((long) 0x1b710b35131c471bL),
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unchecked((long) 0x28db77f523047d84L), unchecked((long) 0x32caab7b40c72493L), unchecked((long) 0x3c9ebe0a15c9bebcL), unchecked((long) 0x431d67c49c100d4cL),
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unchecked((long) 0x4cc5d4becb3e42b6L), unchecked((long) 0x597f299cfc657e2aL), unchecked((long) 0x5fcb6fab3ad6faecL), unchecked((long) 0x6c44198c4a475817L)
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};
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public int GetByteLength()
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{
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return MyByteLength;
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}
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public abstract string AlgorithmName { get; }
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public abstract int GetDigestSize();
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public abstract int DoFinal(byte[] output, int outOff);
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}
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}
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