1 files changed, 210 insertions, 0 deletions
diff --git a/CPP/7zip/Crypto/Hash/Sha256.cpp b/CPP/7zip/Crypto/Hash/Sha256.cpp
new file mode 100755
index 00000000..db236058
--- /dev/null
+++ b/CPP/7zip/Crypto/Hash/Sha256.cpp
@@ -0,0 +1,210 @@
+// Crypto/Sha256.cpp
+// This code is based on code from Wei Dai's Crypto++ library.
+
+#include "StdAfx.h"
+
+#include "Sha256.h"
+#include "RotateDefs.h"
+
+namespace NCrypto {
+namespace NSha256 {
+
+// define it for speed optimization
+// #define _SHA256_UNROLL
+// #define _SHA256_UNROLL2
+
+void CContext::Init()
+{
+  _state[0] = 0x6a09e667;
+  _state[1] = 0xbb67ae85;
+  _state[2] = 0x3c6ef372;
+  _state[3] = 0xa54ff53a;
+  _state[4] = 0x510e527f;
+  _state[5] = 0x9b05688c;
+  _state[6] = 0x1f83d9ab;
+  _state[7] = 0x5be0cd19;
+  
+  _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
+
+
+void CContext::Transform(UInt32 *state, const UInt32 *data)
+{
+  UInt32 W[16];
+
+  #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 (int s = 0; s < 8; s++)
+    T[s] = state[s];
+  #endif
+
+  for (unsigned int j = 0; j < 64; j += 16)
+  {
+    #if defined(_SHA256_UNROLL) || defined(_SHA256_UNROLL2)
+    RX_8(0); RX_8(8);
+    #else
+    for (unsigned int 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 (int i = 0; i < 8; i++)
+    state[i] += T[i];
+  #endif
+  
+  // Wipe variables
+  // memset(W, 0, sizeof(W));
+  // memset(T, 0, sizeof(T));
+}
+
+const UInt32 CContext::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
+};
+
+#undef S0
+#undef S1
+#undef s0
+#undef s1
+
+void CContext::WriteByteBlock()
+{
+  UInt32 data32[16];
+  for (int i = 0; i < 16; i++)
+  {
+    data32[i] = (UInt32(_buffer[i * 4]) << 24) +
+      (UInt32(_buffer[i * 4 + 1]) << 16) +
+      (UInt32(_buffer[i * 4 + 2]) << 8) +
+      UInt32(_buffer[i * 4 + 3]);
+  }
+  Transform(_state, data32);
+}
+
+void CContext::Update(const Byte *data, size_t size)
+{
+  UInt32 curBufferPos = (UInt32)_count & 0x3F;
+  while (size > 0)
+  {
+    _buffer[curBufferPos++] = *data++;
+    _count++;
+    size--;
+    if (curBufferPos == 64)
+    {
+      curBufferPos = 0;
+      WriteByteBlock();
+    }
+  }
+}
+
+void CContext::Final(Byte *digest)
+{
+  UInt64 lenInBits = (_count << 3);
+  UInt32 curBufferPos = (UInt32)_count & 0x3F;
+  _buffer[curBufferPos++] = 0x80;
+  while (curBufferPos != (64 - 8))
+  {
+    curBufferPos &= 0x3F;
+    if (curBufferPos == 0)
+      WriteByteBlock();
+    _buffer[curBufferPos++] = 0;
+  }
+  for (int i = 0; i < 8; i++)
+  {
+    _buffer[curBufferPos++] = (Byte)(lenInBits >> 56);
+    lenInBits <<= 8;
+  }
+  WriteByteBlock();
+
+  for (int j = 0; j < 8; j++)
+  {
+    *digest++ = (Byte)(_state[j] >> 24);
+    *digest++ = (Byte)(_state[j] >> 16);
+    *digest++ = (Byte)(_state[j] >> 8);
+    *digest++ = (Byte)(_state[j]);
+  }
+  Init();
+}
+
+}}