diff --git a/Crypto/src/crypto/digests/RipeMD256Digest.cs b/Crypto/src/crypto/digests/RipeMD256Digest.cs
new file mode 100644
index 000000000..950e94f80
--- /dev/null
+++ b/Crypto/src/crypto/digests/RipeMD256Digest.cs
@@ -0,0 +1,409 @@
+using System;
+
+namespace Org.BouncyCastle.Crypto.Digests
+{
+ /// <remarks>
+ /// <p>Implementation of RipeMD256.</p>
+ /// <p><b>Note:</b> this algorithm offers the same level of security as RipeMD128.</p>
+ /// </remarks>
+ public class RipeMD256Digest
+ : GeneralDigest
+ {
+ public override string AlgorithmName
+ {
+ get { return "RIPEMD256"; }
+ }
+
+ public override int GetDigestSize()
+ {
+ return DigestLength;
+ }
+
+ private const int DigestLength = 32;
+
+ private int H0, H1, H2, H3, H4, H5, H6, H7; // IV's
+
+ private int[] X = new int[16];
+ private int xOff;
+
+ /// <summary> Standard constructor</summary>
+ public RipeMD256Digest()
+ {
+ Reset();
+ }
+
+ /// <summary> Copy constructor. This will copy the state of the provided
+ /// message digest.
+ /// </summary>
+ public RipeMD256Digest(RipeMD256Digest t):base(t)
+ {
+
+ H0 = t.H0;
+ H1 = t.H1;
+ H2 = t.H2;
+ H3 = t.H3;
+ H4 = t.H4;
+ H5 = t.H5;
+ H6 = t.H6;
+ H7 = t.H7;
+
+ Array.Copy(t.X, 0, X, 0, t.X.Length);
+ xOff = t.xOff;
+ }
+
+ 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)(uint)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);
+ UnpackWord(H5, output, outOff + 20);
+ UnpackWord(H6, output, outOff + 24);
+ UnpackWord(H7, output, outOff + 28);
+
+ Reset();
+
+ return DigestLength;
+ }
+
+ /// <summary> reset the chaining variables to the IV values.</summary>
+ 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)0x76543210);
+ H5 = unchecked((int)0xFEDCBA98);
+ H6 = unchecked((int)0x89ABCDEF);
+ H7 = unchecked((int)0x01234567);
+
+ 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 are the basic RipeMD128 functions.
+ */
+
+ /*
+ * F
+ */
+ private int F1(int x, int y, int z)
+ {
+ return x ^ y ^ z;
+ }
+
+ /*
+ * G
+ */
+ private int F2(int x, int y, int z)
+ {
+ return (x & y) | (~ x & z);
+ }
+
+ /*
+ * H
+ */
+ private int F3(int x, int y, int z)
+ {
+ return (x | ~ y) ^ z;
+ }
+
+ /*
+ * I
+ */
+ private int F4(int x, int y, int z)
+ {
+ return (x & z) | (y & ~ z);
+ }
+
+ private int F1(int a, int b, int c, int d, int x, int s)
+ {
+ return RL(a + F1(b, c, d) + x, s);
+ }
+
+ private int F2(int a, int b, int c, int d, int x, int s)
+ {
+ return RL(a + F2(b, c, d) + x + unchecked((int)0x5a827999), s);
+ }
+
+ private int F3(int a, int b, int c, int d, int x, int s)
+ {
+ return RL(a + F3(b, c, d) + x + unchecked((int)0x6ed9eba1), s);
+ }
+
+ private int F4(int a, int b, int c, int d, int x, int s)
+ {
+ return RL(a + F4(b, c, d) + x + unchecked((int)0x8f1bbcdc), s);
+ }
+
+ private int FF1(int a, int b, int c, int d, int x, int s)
+ {
+ return RL(a + F1(b, c, d) + x, s);
+ }
+
+ private int FF2(int a, int b, int c, int d, int x, int s)
+ {
+ return RL(a + F2(b, c, d) + x + unchecked((int)0x6d703ef3), s);
+ }
+
+ private int FF3(int a, int b, int c, int d, int x, int s)
+ {
+ return RL(a + F3(b, c, d) + x + unchecked((int)0x5c4dd124), s);
+ }
+
+ private int FF4(int a, int b, int c, int d, int x, int s)
+ {
+ return RL(a + F4(b, c, d) + x + unchecked((int)0x50a28be6), s);
+ }
+
+ internal override void ProcessBlock()
+ {
+ int a, aa;
+ int b, bb;
+ int c, cc;
+ int d, dd;
+ int t;
+
+ a = H0;
+ b = H1;
+ c = H2;
+ d = H3;
+ aa = H4;
+ bb = H5;
+ cc = H6;
+ dd = H7;
+
+ //
+ // Round 1
+ //
+
+ a = F1(a, b, c, d, X[0], 11);
+ d = F1(d, a, b, c, X[1], 14);
+ c = F1(c, d, a, b, X[2], 15);
+ b = F1(b, c, d, a, X[3], 12);
+ a = F1(a, b, c, d, X[4], 5);
+ d = F1(d, a, b, c, X[5], 8);
+ c = F1(c, d, a, b, X[6], 7);
+ b = F1(b, c, d, a, X[7], 9);
+ a = F1(a, b, c, d, X[8], 11);
+ d = F1(d, a, b, c, X[9], 13);
+ c = F1(c, d, a, b, X[10], 14);
+ b = F1(b, c, d, a, X[11], 15);
+ a = F1(a, b, c, d, X[12], 6);
+ d = F1(d, a, b, c, X[13], 7);
+ c = F1(c, d, a, b, X[14], 9);
+ b = F1(b, c, d, a, X[15], 8);
+
+ aa = FF4(aa, bb, cc, dd, X[5], 8);
+ dd = FF4(dd, aa, bb, cc, X[14], 9);
+ cc = FF4(cc, dd, aa, bb, X[7], 9);
+ bb = FF4(bb, cc, dd, aa, X[0], 11);
+ aa = FF4(aa, bb, cc, dd, X[9], 13);
+ dd = FF4(dd, aa, bb, cc, X[2], 15);
+ cc = FF4(cc, dd, aa, bb, X[11], 15);
+ bb = FF4(bb, cc, dd, aa, X[4], 5);
+ aa = FF4(aa, bb, cc, dd, X[13], 7);
+ dd = FF4(dd, aa, bb, cc, X[6], 7);
+ cc = FF4(cc, dd, aa, bb, X[15], 8);
+ bb = FF4(bb, cc, dd, aa, X[8], 11);
+ aa = FF4(aa, bb, cc, dd, X[1], 14);
+ dd = FF4(dd, aa, bb, cc, X[10], 14);
+ cc = FF4(cc, dd, aa, bb, X[3], 12);
+ bb = FF4(bb, cc, dd, aa, X[12], 6);
+
+ t = a; a = aa; aa = t;
+
+ //
+ // Round 2
+ //
+ a = F2(a, b, c, d, X[7], 7);
+ d = F2(d, a, b, c, X[4], 6);
+ c = F2(c, d, a, b, X[13], 8);
+ b = F2(b, c, d, a, X[1], 13);
+ a = F2(a, b, c, d, X[10], 11);
+ d = F2(d, a, b, c, X[6], 9);
+ c = F2(c, d, a, b, X[15], 7);
+ b = F2(b, c, d, a, X[3], 15);
+ a = F2(a, b, c, d, X[12], 7);
+ d = F2(d, a, b, c, X[0], 12);
+ c = F2(c, d, a, b, X[9], 15);
+ b = F2(b, c, d, a, X[5], 9);
+ a = F2(a, b, c, d, X[2], 11);
+ d = F2(d, a, b, c, X[14], 7);
+ c = F2(c, d, a, b, X[11], 13);
+ b = F2(b, c, d, a, X[8], 12);
+
+ aa = FF3(aa, bb, cc, dd, X[6], 9);
+ dd = FF3(dd, aa, bb, cc, X[11], 13);
+ cc = FF3(cc, dd, aa, bb, X[3], 15);
+ bb = FF3(bb, cc, dd, aa, X[7], 7);
+ aa = FF3(aa, bb, cc, dd, X[0], 12);
+ dd = FF3(dd, aa, bb, cc, X[13], 8);
+ cc = FF3(cc, dd, aa, bb, X[5], 9);
+ bb = FF3(bb, cc, dd, aa, X[10], 11);
+ aa = FF3(aa, bb, cc, dd, X[14], 7);
+ dd = FF3(dd, aa, bb, cc, X[15], 7);
+ cc = FF3(cc, dd, aa, bb, X[8], 12);
+ bb = FF3(bb, cc, dd, aa, X[12], 7);
+ aa = FF3(aa, bb, cc, dd, X[4], 6);
+ dd = FF3(dd, aa, bb, cc, X[9], 15);
+ cc = FF3(cc, dd, aa, bb, X[1], 13);
+ bb = FF3(bb, cc, dd, aa, X[2], 11);
+
+ t = b; b = bb; bb = t;
+
+ //
+ // Round 3
+ //
+ a = F3(a, b, c, d, X[3], 11);
+ d = F3(d, a, b, c, X[10], 13);
+ c = F3(c, d, a, b, X[14], 6);
+ b = F3(b, c, d, a, X[4], 7);
+ a = F3(a, b, c, d, X[9], 14);
+ d = F3(d, a, b, c, X[15], 9);
+ c = F3(c, d, a, b, X[8], 13);
+ b = F3(b, c, d, a, X[1], 15);
+ a = F3(a, b, c, d, X[2], 14);
+ d = F3(d, a, b, c, X[7], 8);
+ c = F3(c, d, a, b, X[0], 13);
+ b = F3(b, c, d, a, X[6], 6);
+ a = F3(a, b, c, d, X[13], 5);
+ d = F3(d, a, b, c, X[11], 12);
+ c = F3(c, d, a, b, X[5], 7);
+ b = F3(b, c, d, a, X[12], 5);
+
+ aa = FF2(aa, bb, cc, dd, X[15], 9);
+ dd = FF2(dd, aa, bb, cc, X[5], 7);
+ cc = FF2(cc, dd, aa, bb, X[1], 15);
+ bb = FF2(bb, cc, dd, aa, X[3], 11);
+ aa = FF2(aa, bb, cc, dd, X[7], 8);
+ dd = FF2(dd, aa, bb, cc, X[14], 6);
+ cc = FF2(cc, dd, aa, bb, X[6], 6);
+ bb = FF2(bb, cc, dd, aa, X[9], 14);
+ aa = FF2(aa, bb, cc, dd, X[11], 12);
+ dd = FF2(dd, aa, bb, cc, X[8], 13);
+ cc = FF2(cc, dd, aa, bb, X[12], 5);
+ bb = FF2(bb, cc, dd, aa, X[2], 14);
+ aa = FF2(aa, bb, cc, dd, X[10], 13);
+ dd = FF2(dd, aa, bb, cc, X[0], 13);
+ cc = FF2(cc, dd, aa, bb, X[4], 7);
+ bb = FF2(bb, cc, dd, aa, X[13], 5);
+
+ t = c; c = cc; cc = t;
+
+ //
+ // Round 4
+ //
+ a = F4(a, b, c, d, X[1], 11);
+ d = F4(d, a, b, c, X[9], 12);
+ c = F4(c, d, a, b, X[11], 14);
+ b = F4(b, c, d, a, X[10], 15);
+ a = F4(a, b, c, d, X[0], 14);
+ d = F4(d, a, b, c, X[8], 15);
+ c = F4(c, d, a, b, X[12], 9);
+ b = F4(b, c, d, a, X[4], 8);
+ a = F4(a, b, c, d, X[13], 9);
+ d = F4(d, a, b, c, X[3], 14);
+ c = F4(c, d, a, b, X[7], 5);
+ b = F4(b, c, d, a, X[15], 6);
+ a = F4(a, b, c, d, X[14], 8);
+ d = F4(d, a, b, c, X[5], 6);
+ c = F4(c, d, a, b, X[6], 5);
+ b = F4(b, c, d, a, X[2], 12);
+
+ aa = FF1(aa, bb, cc, dd, X[8], 15);
+ dd = FF1(dd, aa, bb, cc, X[6], 5);
+ cc = FF1(cc, dd, aa, bb, X[4], 8);
+ bb = FF1(bb, cc, dd, aa, X[1], 11);
+ aa = FF1(aa, bb, cc, dd, X[3], 14);
+ dd = FF1(dd, aa, bb, cc, X[11], 14);
+ cc = FF1(cc, dd, aa, bb, X[15], 6);
+ bb = FF1(bb, cc, dd, aa, X[0], 14);
+ aa = FF1(aa, bb, cc, dd, X[5], 6);
+ dd = FF1(dd, aa, bb, cc, X[12], 9);
+ cc = FF1(cc, dd, aa, bb, X[2], 12);
+ bb = FF1(bb, cc, dd, aa, X[13], 9);
+ aa = FF1(aa, bb, cc, dd, X[9], 12);
+ dd = FF1(dd, aa, bb, cc, X[7], 5);
+ cc = FF1(cc, dd, aa, bb, X[10], 15);
+ bb = FF1(bb, cc, dd, aa, X[14], 8);
+
+ t = d; d = dd; dd = t;
+
+ H0 += a;
+ H1 += b;
+ H2 += c;
+ H3 += d;
+ H4 += aa;
+ H5 += bb;
+ H6 += cc;
+ H7 += dd;
+
+ //
+ // reset the offset and clean out the word buffer.
+ //
+ xOff = 0;
+ for (int i = 0; i != X.Length; i++)
+ {
+ X[i] = 0;
+ }
+ }
+ }
+}
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