using System;

using NBitcoin.BouncyCastle.Utilities;

namespace NBitcoin.BouncyCastle.Crypto.Digests
{
	/**
    * implementation of RipeMD see,
    * http://www.esat.kuleuven.ac.be/~bosselae/ripemd160.html
    */
	internal class RipeMD160Digest
		: GeneralDigest
	{
		private const int DigestLength = 20;

		private int H0, H1, H2, H3, H4; // IV's

		private int[] X = new int[16];
		private int xOff;

		/**
        * Standard constructor
        */
		public RipeMD160Digest()
		{
			Reset();
		}

		/**
        * Copy constructor.  This will copy the state of the provided
        * message digest.
        */
		public RipeMD160Digest(RipeMD160Digest t) : base(t)
		{
			CopyIn(t);
		}

		private void CopyIn(RipeMD160Digest t)
		{
			base.CopyIn(t);

			H0 = t.H0;
			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 "RIPEMD160";
			}
		}

		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(H0, output, outOff);
			UnpackWord(H1, output, outOff + 4);
			UnpackWord(H2, output, outOff + 8);
			UnpackWord(H3, output, outOff + 12);
			UnpackWord(H4, output, outOff + 16);

			Reset();

			return DigestLength;
		}

		/**
        * reset the chaining variables to the IV values.
        */
		public override void Reset()
		{
			base.Reset();

			H0 = unchecked((int)0x67452301);
			H1 = unchecked((int)0xefcdab89);
			H2 = unchecked((int)0x98badcfe);
			H3 = unchecked((int)0x10325476);
			H4 = unchecked((int)0xc3d2e1f0);

			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) | (int)((uint)x >> (32 - n));
		}

		/*
        * f1,f2,f3,f4,f5 are the basic RipeMD160 functions.
        */

		/*
        * rounds 0-15
        */
		private int F1(
			int x,
			int y,
			int z)
		{
			return x ^ y ^ z;
		}

		/*
        * rounds 16-31
        */
		private int F2(
			int x,
			int y,
			int z)
		{
			return (x & y) | (~x & z);
		}

		/*
        * rounds 32-47
        */
		private int F3(
			int x,
			int y,
			int z)
		{
			return (x | ~y) ^ z;
		}

		/*
        * rounds 48-63
        */
		private int F4(
			int x,
			int y,
			int z)
		{
			return (x & z) | (y & ~z);
		}

		/*
        * rounds 64-79
        */
		private int F5(
			int x,
			int y,
			int z)
		{
			return x ^ (y | ~z);
		}

		internal override void ProcessBlock()
		{
			int a, aa;
			int b, bb;
			int c, cc;
			int d, dd;
			int e, ee;

			a = aa = H0;
			b = bb = H1;
			c = cc = H2;
			d = dd = H3;
			e = ee = H4;

			//
			// Rounds 1 - 16
			//
			// left
			a = RL(a + F1(b, c, d) + X[0], 11) + e;
			c = RL(c, 10);
			e = RL(e + F1(a, b, c) + X[1], 14) + d;
			b = RL(b, 10);
			d = RL(d + F1(e, a, b) + X[2], 15) + c;
			a = RL(a, 10);
			c = RL(c + F1(d, e, a) + X[3], 12) + b;
			e = RL(e, 10);
			b = RL(b + F1(c, d, e) + X[4], 5) + a;
			d = RL(d, 10);
			a = RL(a + F1(b, c, d) + X[5], 8) + e;
			c = RL(c, 10);
			e = RL(e + F1(a, b, c) + X[6], 7) + d;
			b = RL(b, 10);
			d = RL(d + F1(e, a, b) + X[7], 9) + c;
			a = RL(a, 10);
			c = RL(c + F1(d, e, a) + X[8], 11) + b;
			e = RL(e, 10);
			b = RL(b + F1(c, d, e) + X[9], 13) + a;
			d = RL(d, 10);
			a = RL(a + F1(b, c, d) + X[10], 14) + e;
			c = RL(c, 10);
			e = RL(e + F1(a, b, c) + X[11], 15) + d;
			b = RL(b, 10);
			d = RL(d + F1(e, a, b) + X[12], 6) + c;
			a = RL(a, 10);
			c = RL(c + F1(d, e, a) + X[13], 7) + b;
			e = RL(e, 10);
			b = RL(b + F1(c, d, e) + X[14], 9) + a;
			d = RL(d, 10);
			a = RL(a + F1(b, c, d) + X[15], 8) + e;
			c = RL(c, 10);

			// right
			aa = RL(aa + F5(bb, cc, dd) + X[5] + unchecked((int)0x50a28be6), 8) + ee;
			cc = RL(cc, 10);
			ee = RL(ee + F5(aa, bb, cc) + X[14] + unchecked((int)0x50a28be6), 9) + dd;
			bb = RL(bb, 10);
			dd = RL(dd + F5(ee, aa, bb) + X[7] + unchecked((int)0x50a28be6), 9) + cc;
			aa = RL(aa, 10);
			cc = RL(cc + F5(dd, ee, aa) + X[0] + unchecked((int)0x50a28be6), 11) + bb;
			ee = RL(ee, 10);
			bb = RL(bb + F5(cc, dd, ee) + X[9] + unchecked((int)0x50a28be6), 13) + aa;
			dd = RL(dd, 10);
			aa = RL(aa + F5(bb, cc, dd) + X[2] + unchecked((int)0x50a28be6), 15) + ee;
			cc = RL(cc, 10);
			ee = RL(ee + F5(aa, bb, cc) + X[11] + unchecked((int)0x50a28be6), 15) + dd;
			bb = RL(bb, 10);
			dd = RL(dd + F5(ee, aa, bb) + X[4] + unchecked((int)0x50a28be6), 5) + cc;
			aa = RL(aa, 10);
			cc = RL(cc + F5(dd, ee, aa) + X[13] + unchecked((int)0x50a28be6), 7) + bb;
			ee = RL(ee, 10);
			bb = RL(bb + F5(cc, dd, ee) + X[6] + unchecked((int)0x50a28be6), 7) + aa;
			dd = RL(dd, 10);
			aa = RL(aa + F5(bb, cc, dd) + X[15] + unchecked((int)0x50a28be6), 8) + ee;
			cc = RL(cc, 10);
			ee = RL(ee + F5(aa, bb, cc) + X[8] + unchecked((int)0x50a28be6), 11) + dd;
			bb = RL(bb, 10);
			dd = RL(dd + F5(ee, aa, bb) + X[1] + unchecked((int)0x50a28be6), 14) + cc;
			aa = RL(aa, 10);
			cc = RL(cc + F5(dd, ee, aa) + X[10] + unchecked((int)0x50a28be6), 14) + bb;
			ee = RL(ee, 10);
			bb = RL(bb + F5(cc, dd, ee) + X[3] + unchecked((int)0x50a28be6), 12) + aa;
			dd = RL(dd, 10);
			aa = RL(aa + F5(bb, cc, dd) + X[12] + unchecked((int)0x50a28be6), 6) + ee;
			cc = RL(cc, 10);

			//
			// Rounds 16-31
			//
			// left
			e = RL(e + F2(a, b, c) + X[7] + unchecked((int)0x5a827999), 7) + d;
			b = RL(b, 10);
			d = RL(d + F2(e, a, b) + X[4] + unchecked((int)0x5a827999), 6) + c;
			a = RL(a, 10);
			c = RL(c + F2(d, e, a) + X[13] + unchecked((int)0x5a827999), 8) + b;
			e = RL(e, 10);
			b = RL(b + F2(c, d, e) + X[1] + unchecked((int)0x5a827999), 13) + a;
			d = RL(d, 10);
			a = RL(a + F2(b, c, d) + X[10] + unchecked((int)0x5a827999), 11) + e;
			c = RL(c, 10);
			e = RL(e + F2(a, b, c) + X[6] + unchecked((int)0x5a827999), 9) + d;
			b = RL(b, 10);
			d = RL(d + F2(e, a, b) + X[15] + unchecked((int)0x5a827999), 7) + c;
			a = RL(a, 10);
			c = RL(c + F2(d, e, a) + X[3] + unchecked((int)0x5a827999), 15) + b;
			e = RL(e, 10);
			b = RL(b + F2(c, d, e) + X[12] + unchecked((int)0x5a827999), 7) + a;
			d = RL(d, 10);
			a = RL(a + F2(b, c, d) + X[0] + unchecked((int)0x5a827999), 12) + e;
			c = RL(c, 10);
			e = RL(e + F2(a, b, c) + X[9] + unchecked((int)0x5a827999), 15) + d;
			b = RL(b, 10);
			d = RL(d + F2(e, a, b) + X[5] + unchecked((int)0x5a827999), 9) + c;
			a = RL(a, 10);
			c = RL(c + F2(d, e, a) + X[2] + unchecked((int)0x5a827999), 11) + b;
			e = RL(e, 10);
			b = RL(b + F2(c, d, e) + X[14] + unchecked((int)0x5a827999), 7) + a;
			d = RL(d, 10);
			a = RL(a + F2(b, c, d) + X[11] + unchecked((int)0x5a827999), 13) + e;
			c = RL(c, 10);
			e = RL(e + F2(a, b, c) + X[8] + unchecked((int)0x5a827999), 12) + d;
			b = RL(b, 10);

			// right
			ee = RL(ee + F4(aa, bb, cc) + X[6] + unchecked((int)0x5c4dd124), 9) + dd;
			bb = RL(bb, 10);
			dd = RL(dd + F4(ee, aa, bb) + X[11] + unchecked((int)0x5c4dd124), 13) + cc;
			aa = RL(aa, 10);
			cc = RL(cc + F4(dd, ee, aa) + X[3] + unchecked((int)0x5c4dd124), 15) + bb;
			ee = RL(ee, 10);
			bb = RL(bb + F4(cc, dd, ee) + X[7] + unchecked((int)0x5c4dd124), 7) + aa;
			dd = RL(dd, 10);
			aa = RL(aa + F4(bb, cc, dd) + X[0] + unchecked((int)0x5c4dd124), 12) + ee;
			cc = RL(cc, 10);
			ee = RL(ee + F4(aa, bb, cc) + X[13] + unchecked((int)0x5c4dd124), 8) + dd;
			bb = RL(bb, 10);
			dd = RL(dd + F4(ee, aa, bb) + X[5] + unchecked((int)0x5c4dd124), 9) + cc;
			aa = RL(aa, 10);
			cc = RL(cc + F4(dd, ee, aa) + X[10] + unchecked((int)0x5c4dd124), 11) + bb;
			ee = RL(ee, 10);
			bb = RL(bb + F4(cc, dd, ee) + X[14] + unchecked((int)0x5c4dd124), 7) + aa;
			dd = RL(dd, 10);
			aa = RL(aa + F4(bb, cc, dd) + X[15] + unchecked((int)0x5c4dd124), 7) + ee;
			cc = RL(cc, 10);
			ee = RL(ee + F4(aa, bb, cc) + X[8] + unchecked((int)0x5c4dd124), 12) + dd;
			bb = RL(bb, 10);
			dd = RL(dd + F4(ee, aa, bb) + X[12] + unchecked((int)0x5c4dd124), 7) + cc;
			aa = RL(aa, 10);
			cc = RL(cc + F4(dd, ee, aa) + X[4] + unchecked((int)0x5c4dd124), 6) + bb;
			ee = RL(ee, 10);
			bb = RL(bb + F4(cc, dd, ee) + X[9] + unchecked((int)0x5c4dd124), 15) + aa;
			dd = RL(dd, 10);
			aa = RL(aa + F4(bb, cc, dd) + X[1] + unchecked((int)0x5c4dd124), 13) + ee;
			cc = RL(cc, 10);
			ee = RL(ee + F4(aa, bb, cc) + X[2] + unchecked((int)0x5c4dd124), 11) + dd;
			bb = RL(bb, 10);

			//
			// Rounds 32-47
			//
			// left
			d = RL(d + F3(e, a, b) + X[3] + unchecked((int)0x6ed9eba1), 11) + c;
			a = RL(a, 10);
			c = RL(c + F3(d, e, a) + X[10] + unchecked((int)0x6ed9eba1), 13) + b;
			e = RL(e, 10);
			b = RL(b + F3(c, d, e) + X[14] + unchecked((int)0x6ed9eba1), 6) + a;
			d = RL(d, 10);
			a = RL(a + F3(b, c, d) + X[4] + unchecked((int)0x6ed9eba1), 7) + e;
			c = RL(c, 10);
			e = RL(e + F3(a, b, c) + X[9] + unchecked((int)0x6ed9eba1), 14) + d;
			b = RL(b, 10);
			d = RL(d + F3(e, a, b) + X[15] + unchecked((int)0x6ed9eba1), 9) + c;
			a = RL(a, 10);
			c = RL(c + F3(d, e, a) + X[8] + unchecked((int)0x6ed9eba1), 13) + b;
			e = RL(e, 10);
			b = RL(b + F3(c, d, e) + X[1] + unchecked((int)0x6ed9eba1), 15) + a;
			d = RL(d, 10);
			a = RL(a + F3(b, c, d) + X[2] + unchecked((int)0x6ed9eba1), 14) + e;
			c = RL(c, 10);
			e = RL(e + F3(a, b, c) + X[7] + unchecked((int)0x6ed9eba1), 8) + d;
			b = RL(b, 10);
			d = RL(d + F3(e, a, b) + X[0] + unchecked((int)0x6ed9eba1), 13) + c;
			a = RL(a, 10);
			c = RL(c + F3(d, e, a) + X[6] + unchecked((int)0x6ed9eba1), 6) + b;
			e = RL(e, 10);
			b = RL(b + F3(c, d, e) + X[13] + unchecked((int)0x6ed9eba1), 5) + a;
			d = RL(d, 10);
			a = RL(a + F3(b, c, d) + X[11] + unchecked((int)0x6ed9eba1), 12) + e;
			c = RL(c, 10);
			e = RL(e + F3(a, b, c) + X[5] + unchecked((int)0x6ed9eba1), 7) + d;
			b = RL(b, 10);
			d = RL(d + F3(e, a, b) + X[12] + unchecked((int)0x6ed9eba1), 5) + c;
			a = RL(a, 10);

			// right
			dd = RL(dd + F3(ee, aa, bb) + X[15] + unchecked((int)0x6d703ef3), 9) + cc;
			aa = RL(aa, 10);
			cc = RL(cc + F3(dd, ee, aa) + X[5] + unchecked((int)0x6d703ef3), 7) + bb;
			ee = RL(ee, 10);
			bb = RL(bb + F3(cc, dd, ee) + X[1] + unchecked((int)0x6d703ef3), 15) + aa;
			dd = RL(dd, 10);
			aa = RL(aa + F3(bb, cc, dd) + X[3] + unchecked((int)0x6d703ef3), 11) + ee;
			cc = RL(cc, 10);
			ee = RL(ee + F3(aa, bb, cc) + X[7] + unchecked((int)0x6d703ef3), 8) + dd;
			bb = RL(bb, 10);
			dd = RL(dd + F3(ee, aa, bb) + X[14] + unchecked((int)0x6d703ef3), 6) + cc;
			aa = RL(aa, 10);
			cc = RL(cc + F3(dd, ee, aa) + X[6] + unchecked((int)0x6d703ef3), 6) + bb;
			ee = RL(ee, 10);
			bb = RL(bb + F3(cc, dd, ee) + X[9] + unchecked((int)0x6d703ef3), 14) + aa;
			dd = RL(dd, 10);
			aa = RL(aa + F3(bb, cc, dd) + X[11] + unchecked((int)0x6d703ef3), 12) + ee;
			cc = RL(cc, 10);
			ee = RL(ee + F3(aa, bb, cc) + X[8] + unchecked((int)0x6d703ef3), 13) + dd;
			bb = RL(bb, 10);
			dd = RL(dd + F3(ee, aa, bb) + X[12] + unchecked((int)0x6d703ef3), 5) + cc;
			aa = RL(aa, 10);
			cc = RL(cc + F3(dd, ee, aa) + X[2] + unchecked((int)0x6d703ef3), 14) + bb;
			ee = RL(ee, 10);
			bb = RL(bb + F3(cc, dd, ee) + X[10] + unchecked((int)0x6d703ef3), 13) + aa;
			dd = RL(dd, 10);
			aa = RL(aa + F3(bb, cc, dd) + X[0] + unchecked((int)0x6d703ef3), 13) + ee;
			cc = RL(cc, 10);
			ee = RL(ee + F3(aa, bb, cc) + X[4] + unchecked((int)0x6d703ef3), 7) + dd;
			bb = RL(bb, 10);
			dd = RL(dd + F3(ee, aa, bb) + X[13] + unchecked((int)0x6d703ef3), 5) + cc;
			aa = RL(aa, 10);

			//
			// Rounds 48-63
			//
			// left
			c = RL(c + F4(d, e, a) + X[1] + unchecked((int)0x8f1bbcdc), 11) + b;
			e = RL(e, 10);
			b = RL(b + F4(c, d, e) + X[9] + unchecked((int)0x8f1bbcdc), 12) + a;
			d = RL(d, 10);
			a = RL(a + F4(b, c, d) + X[11] + unchecked((int)0x8f1bbcdc), 14) + e;
			c = RL(c, 10);
			e = RL(e + F4(a, b, c) + X[10] + unchecked((int)0x8f1bbcdc), 15) + d;
			b = RL(b, 10);
			d = RL(d + F4(e, a, b) + X[0] + unchecked((int)0x8f1bbcdc), 14) + c;
			a = RL(a, 10);
			c = RL(c + F4(d, e, a) + X[8] + unchecked((int)0x8f1bbcdc), 15) + b;
			e = RL(e, 10);
			b = RL(b + F4(c, d, e) + X[12] + unchecked((int)0x8f1bbcdc), 9) + a;
			d = RL(d, 10);
			a = RL(a + F4(b, c, d) + X[4] + unchecked((int)0x8f1bbcdc), 8) + e;
			c = RL(c, 10);
			e = RL(e + F4(a, b, c) + X[13] + unchecked((int)0x8f1bbcdc), 9) + d;
			b = RL(b, 10);
			d = RL(d + F4(e, a, b) + X[3] + unchecked((int)0x8f1bbcdc), 14) + c;
			a = RL(a, 10);
			c = RL(c + F4(d, e, a) + X[7] + unchecked((int)0x8f1bbcdc), 5) + b;
			e = RL(e, 10);
			b = RL(b + F4(c, d, e) + X[15] + unchecked((int)0x8f1bbcdc), 6) + a;
			d = RL(d, 10);
			a = RL(a + F4(b, c, d) + X[14] + unchecked((int)0x8f1bbcdc), 8) + e;
			c = RL(c, 10);
			e = RL(e + F4(a, b, c) + X[5] + unchecked((int)0x8f1bbcdc), 6) + d;
			b = RL(b, 10);
			d = RL(d + F4(e, a, b) + X[6] + unchecked((int)0x8f1bbcdc), 5) + c;
			a = RL(a, 10);
			c = RL(c + F4(d, e, a) + X[2] + unchecked((int)0x8f1bbcdc), 12) + b;
			e = RL(e, 10);

			// right
			cc = RL(cc + F2(dd, ee, aa) + X[8] + unchecked((int)0x7a6d76e9), 15) + bb;
			ee = RL(ee, 10);
			bb = RL(bb + F2(cc, dd, ee) + X[6] + unchecked((int)0x7a6d76e9), 5) + aa;
			dd = RL(dd, 10);
			aa = RL(aa + F2(bb, cc, dd) + X[4] + unchecked((int)0x7a6d76e9), 8) + ee;
			cc = RL(cc, 10);
			ee = RL(ee + F2(aa, bb, cc) + X[1] + unchecked((int)0x7a6d76e9), 11) + dd;
			bb = RL(bb, 10);
			dd = RL(dd + F2(ee, aa, bb) + X[3] + unchecked((int)0x7a6d76e9), 14) + cc;
			aa = RL(aa, 10);
			cc = RL(cc + F2(dd, ee, aa) + X[11] + unchecked((int)0x7a6d76e9), 14) + bb;
			ee = RL(ee, 10);
			bb = RL(bb + F2(cc, dd, ee) + X[15] + unchecked((int)0x7a6d76e9), 6) + aa;
			dd = RL(dd, 10);
			aa = RL(aa + F2(bb, cc, dd) + X[0] + unchecked((int)0x7a6d76e9), 14) + ee;
			cc = RL(cc, 10);
			ee = RL(ee + F2(aa, bb, cc) + X[5] + unchecked((int)0x7a6d76e9), 6) + dd;
			bb = RL(bb, 10);
			dd = RL(dd + F2(ee, aa, bb) + X[12] + unchecked((int)0x7a6d76e9), 9) + cc;
			aa = RL(aa, 10);
			cc = RL(cc + F2(dd, ee, aa) + X[2] + unchecked((int)0x7a6d76e9), 12) + bb;
			ee = RL(ee, 10);
			bb = RL(bb + F2(cc, dd, ee) + X[13] + unchecked((int)0x7a6d76e9), 9) + aa;
			dd = RL(dd, 10);
			aa = RL(aa + F2(bb, cc, dd) + X[9] + unchecked((int)0x7a6d76e9), 12) + ee;
			cc = RL(cc, 10);
			ee = RL(ee + F2(aa, bb, cc) + X[7] + unchecked((int)0x7a6d76e9), 5) + dd;
			bb = RL(bb, 10);
			dd = RL(dd + F2(ee, aa, bb) + X[10] + unchecked((int)0x7a6d76e9), 15) + cc;
			aa = RL(aa, 10);
			cc = RL(cc + F2(dd, ee, aa) + X[14] + unchecked((int)0x7a6d76e9), 8) + bb;
			ee = RL(ee, 10);

			//
			// Rounds 64-79
			//
			// left
			b = RL(b + F5(c, d, e) + X[4] + unchecked((int)0xa953fd4e), 9) + a;
			d = RL(d, 10);
			a = RL(a + F5(b, c, d) + X[0] + unchecked((int)0xa953fd4e), 15) + e;
			c = RL(c, 10);
			e = RL(e + F5(a, b, c) + X[5] + unchecked((int)0xa953fd4e), 5) + d;
			b = RL(b, 10);
			d = RL(d + F5(e, a, b) + X[9] + unchecked((int)0xa953fd4e), 11) + c;
			a = RL(a, 10);
			c = RL(c + F5(d, e, a) + X[7] + unchecked((int)0xa953fd4e), 6) + b;
			e = RL(e, 10);
			b = RL(b + F5(c, d, e) + X[12] + unchecked((int)0xa953fd4e), 8) + a;
			d = RL(d, 10);
			a = RL(a + F5(b, c, d) + X[2] + unchecked((int)0xa953fd4e), 13) + e;
			c = RL(c, 10);
			e = RL(e + F5(a, b, c) + X[10] + unchecked((int)0xa953fd4e), 12) + d;
			b = RL(b, 10);
			d = RL(d + F5(e, a, b) + X[14] + unchecked((int)0xa953fd4e), 5) + c;
			a = RL(a, 10);
			c = RL(c + F5(d, e, a) + X[1] + unchecked((int)0xa953fd4e), 12) + b;
			e = RL(e, 10);
			b = RL(b + F5(c, d, e) + X[3] + unchecked((int)0xa953fd4e), 13) + a;
			d = RL(d, 10);
			a = RL(a + F5(b, c, d) + X[8] + unchecked((int)0xa953fd4e), 14) + e;
			c = RL(c, 10);
			e = RL(e + F5(a, b, c) + X[11] + unchecked((int)0xa953fd4e), 11) + d;
			b = RL(b, 10);
			d = RL(d + F5(e, a, b) + X[6] + unchecked((int)0xa953fd4e), 8) + c;
			a = RL(a, 10);
			c = RL(c + F5(d, e, a) + X[15] + unchecked((int)0xa953fd4e), 5) + b;
			e = RL(e, 10);
			b = RL(b + F5(c, d, e) + X[13] + unchecked((int)0xa953fd4e), 6) + a;
			d = RL(d, 10);

			// right
			bb = RL(bb + F1(cc, dd, ee) + X[12], 8) + aa;
			dd = RL(dd, 10);
			aa = RL(aa + F1(bb, cc, dd) + X[15], 5) + ee;
			cc = RL(cc, 10);
			ee = RL(ee + F1(aa, bb, cc) + X[10], 12) + dd;
			bb = RL(bb, 10);
			dd = RL(dd + F1(ee, aa, bb) + X[4], 9) + cc;
			aa = RL(aa, 10);
			cc = RL(cc + F1(dd, ee, aa) + X[1], 12) + bb;
			ee = RL(ee, 10);
			bb = RL(bb + F1(cc, dd, ee) + X[5], 5) + aa;
			dd = RL(dd, 10);
			aa = RL(aa + F1(bb, cc, dd) + X[8], 14) + ee;
			cc = RL(cc, 10);
			ee = RL(ee + F1(aa, bb, cc) + X[7], 6) + dd;
			bb = RL(bb, 10);
			dd = RL(dd + F1(ee, aa, bb) + X[6], 8) + cc;
			aa = RL(aa, 10);
			cc = RL(cc + F1(dd, ee, aa) + X[2], 13) + bb;
			ee = RL(ee, 10);
			bb = RL(bb + F1(cc, dd, ee) + X[13], 6) + aa;
			dd = RL(dd, 10);
			aa = RL(aa + F1(bb, cc, dd) + X[14], 5) + ee;
			cc = RL(cc, 10);
			ee = RL(ee + F1(aa, bb, cc) + X[0], 15) + dd;
			bb = RL(bb, 10);
			dd = RL(dd + F1(ee, aa, bb) + X[3], 13) + cc;
			aa = RL(aa, 10);
			cc = RL(cc + F1(dd, ee, aa) + X[9], 11) + bb;
			ee = RL(ee, 10);
			bb = RL(bb + F1(cc, dd, ee) + X[11], 11) + aa;
			dd = RL(dd, 10);

			dd += c + H1;
			H1 = H2 + d + ee;
			H2 = H3 + e + aa;
			H3 = H4 + a + bb;
			H4 = H0 + b + cc;
			H0 = dd;

			//
			// reset the offset and clean out the word buffer.
			//
			xOff = 0;
			for(int i = 0; i != X.Length; i++)
			{
				X[i] = 0;
			}
		}

		public override IMemoable Copy()
		{
			return new RipeMD160Digest(this);
		}

		public override void Reset(IMemoable other)
		{
			RipeMD160Digest d = (RipeMD160Digest)other;

			CopyIn(d);
		}

	}

}