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diff --git a/C/Sha256.c b/C/Sha256.c
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+/* Crypto/Sha256.c -- SHA-256 Hash
+2010-06-11 : Igor Pavlov : Public domain
+This code is based on public domain code from Wei Dai's Crypto++ library. */
+
+#include "RotateDefs.h"
+#include "Sha256.h"
+
+/* define it for speed optimization */
+/* #define _SHA256_UNROLL */
+/* #define _SHA256_UNROLL2 */
+
+void Sha256_Init(CSha256 *p)
+{
+ p->state[0] = 0x6a09e667;
+ p->state[1] = 0xbb67ae85;
+ p->state[2] = 0x3c6ef372;
+ p->state[3] = 0xa54ff53a;
+ p->state[4] = 0x510e527f;
+ p->state[5] = 0x9b05688c;
+ p->state[6] = 0x1f83d9ab;
+ p->state[7] = 0x5be0cd19;
+ p->count = 0;
+}
+
+#define S0(x) (rotrFixed(x, 2) ^ rotrFixed(x,13) ^ rotrFixed(x, 22))
+#define S1(x) (rotrFixed(x, 6) ^ rotrFixed(x,11) ^ rotrFixed(x, 25))
+#define s0(x) (rotrFixed(x, 7) ^ rotrFixed(x,18) ^ (x >> 3))
+#define s1(x) (rotrFixed(x,17) ^ rotrFixed(x,19) ^ (x >> 10))
+
+#define blk0(i) (W[i] = data[i])
+#define blk2(i) (W[i&15] += s1(W[(i-2)&15]) + W[(i-7)&15] + s0(W[(i-15)&15]))
+
+#define Ch(x,y,z) (z^(x&(y^z)))
+#define Maj(x,y,z) ((x&y)|(z&(x|y)))
+
+#define a(i) T[(0-(i))&7]
+#define b(i) T[(1-(i))&7]
+#define c(i) T[(2-(i))&7]
+#define d(i) T[(3-(i))&7]
+#define e(i) T[(4-(i))&7]
+#define f(i) T[(5-(i))&7]
+#define g(i) T[(6-(i))&7]
+#define h(i) T[(7-(i))&7]
+
+
+#ifdef _SHA256_UNROLL2
+
+#define R(a,b,c,d,e,f,g,h, i) h += S1(e) + Ch(e,f,g) + K[i+j] + (j?blk2(i):blk0(i));\
+ d += h; h += S0(a) + Maj(a, b, c)
+
+#define RX_8(i) \
+ R(a,b,c,d,e,f,g,h, i); \
+ R(h,a,b,c,d,e,f,g, i+1); \
+ R(g,h,a,b,c,d,e,f, i+2); \
+ R(f,g,h,a,b,c,d,e, i+3); \
+ R(e,f,g,h,a,b,c,d, i+4); \
+ R(d,e,f,g,h,a,b,c, i+5); \
+ R(c,d,e,f,g,h,a,b, i+6); \
+ R(b,c,d,e,f,g,h,a, i+7)
+
+#else
+
+#define R(i) h(i) += S1(e(i)) + Ch(e(i),f(i),g(i)) + K[i+j] + (j?blk2(i):blk0(i));\
+ d(i) += h(i); h(i) += S0(a(i)) + Maj(a(i), b(i), c(i))
+
+#ifdef _SHA256_UNROLL
+
+#define RX_8(i) R(i+0); R(i+1); R(i+2); R(i+3); R(i+4); R(i+5); R(i+6); R(i+7);
+
+#endif
+
+#endif
+
+static const UInt32 K[64] = {
+ 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
+ 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+ 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
+ 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+ 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
+ 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+ 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
+ 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
+ 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
+ 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+ 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
+ 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+ 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
+ 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+ 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
+ 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
+};
+
+static void Sha256_Transform(UInt32 *state, const UInt32 *data)
+{
+ UInt32 W[16];
+ unsigned j;
+ #ifdef _SHA256_UNROLL2
+ UInt32 a,b,c,d,e,f,g,h;
+ a = state[0];
+ b = state[1];
+ c = state[2];
+ d = state[3];
+ e = state[4];
+ f = state[5];
+ g = state[6];
+ h = state[7];
+ #else
+ UInt32 T[8];
+ for (j = 0; j < 8; j++)
+ T[j] = state[j];
+ #endif
+
+ for (j = 0; j < 64; j += 16)
+ {
+ #if defined(_SHA256_UNROLL) || defined(_SHA256_UNROLL2)
+ RX_8(0); RX_8(8);
+ #else
+ unsigned i;
+ for (i = 0; i < 16; i++) { R(i); }
+ #endif
+ }
+
+ #ifdef _SHA256_UNROLL2
+ state[0] += a;
+ state[1] += b;
+ state[2] += c;
+ state[3] += d;
+ state[4] += e;
+ state[5] += f;
+ state[6] += g;
+ state[7] += h;
+ #else
+ for (j = 0; j < 8; j++)
+ state[j] += T[j];
+ #endif
+
+ /* Wipe variables */
+ /* memset(W, 0, sizeof(W)); */
+ /* memset(T, 0, sizeof(T)); */
+}
+
+#undef S0
+#undef S1
+#undef s0
+#undef s1
+
+static void Sha256_WriteByteBlock(CSha256 *p)
+{
+ UInt32 data32[16];
+ unsigned i;
+ for (i = 0; i < 16; i++)
+ data32[i] =
+ ((UInt32)(p->buffer[i * 4 ]) << 24) +
+ ((UInt32)(p->buffer[i * 4 + 1]) << 16) +
+ ((UInt32)(p->buffer[i * 4 + 2]) << 8) +
+ ((UInt32)(p->buffer[i * 4 + 3]));
+ Sha256_Transform(p->state, data32);
+}
+
+void Sha256_Update(CSha256 *p, const Byte *data, size_t size)
+{
+ UInt32 curBufferPos = (UInt32)p->count & 0x3F;
+ while (size > 0)
+ {
+ p->buffer[curBufferPos++] = *data++;
+ p->count++;
+ size--;
+ if (curBufferPos == 64)
+ {
+ curBufferPos = 0;
+ Sha256_WriteByteBlock(p);
+ }
+ }
+}
+
+void Sha256_Final(CSha256 *p, Byte *digest)
+{
+ UInt64 lenInBits = (p->count << 3);
+ UInt32 curBufferPos = (UInt32)p->count & 0x3F;
+ unsigned i;
+ p->buffer[curBufferPos++] = 0x80;
+ while (curBufferPos != (64 - 8))
+ {
+ curBufferPos &= 0x3F;
+ if (curBufferPos == 0)
+ Sha256_WriteByteBlock(p);
+ p->buffer[curBufferPos++] = 0;
+ }
+ for (i = 0; i < 8; i++)
+ {
+ p->buffer[curBufferPos++] = (Byte)(lenInBits >> 56);
+ lenInBits <<= 8;
+ }
+ Sha256_WriteByteBlock(p);
+
+ for (i = 0; i < 8; i++)
+ {
+ *digest++ = (Byte)(p->state[i] >> 24);
+ *digest++ = (Byte)(p->state[i] >> 16);
+ *digest++ = (Byte)(p->state[i] >> 8);
+ *digest++ = (Byte)(p->state[i]);
+ }
+ Sha256_Init(p);
+}