3.13

7zip/Crypto/7zAES/SHA256.cpp

@@ -0,0 +1,189 @@
+// Crypto/HASH/SHA256/SHA256.cpp
+// This code is based on code from Wei Dai's Crypto++ library.
+
+#include "StdAfx.h"
+
+#include "SHA256.h"
+#include "Windows/Defs.h"
+
+const int kBufferSize = 1 << 17;
+
+namespace NCrypto {
+namespace NSHA256 {
+
+
+template <class T> static inline T rotrFixed(T x, unsigned int y)
+{
+  // assert(y < sizeof(T)*8);
+  return (x>>y) | (x<<(sizeof(T)*8-y));
+}
+
+#define blk0(i) (W[i] = data[i])
+
+
+void SHA256::Init()
+{
+  m_digest[0] = 0x6a09e667;
+  m_digest[1] = 0xbb67ae85;
+  m_digest[2] = 0x3c6ef372;
+  m_digest[3] = 0xa54ff53a;
+  m_digest[4] = 0x510e527f;
+  m_digest[5] = 0x9b05688c;
+  m_digest[6] = 0x1f83d9ab;
+  m_digest[7] = 0x5be0cd19;
+  
+  m_count = 0;
+}
+
+#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]
+
+#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))
+
+// for SHA256
+#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))
+
+void SHA256::Transform(UINT32 *state, const UINT32 *data)
+{
+  UINT32 W[16];
+  UINT32 T[8];
+  /* Copy context->state[] to working vars */
+  // memcpy(T, state, sizeof(T));
+  for (int s = 0; s < 8; s++)
+    T[s] = state[s];
+
+
+  /* 64 operations, partially loop unrolled */
+  for (unsigned int j = 0; j < 64; j += 16)
+  {
+    for (unsigned int i = 0; i < 16; i++)
+    {
+      R(i);
+    }
+    /*
+    R( 0); R( 1); R( 2); R( 3);
+    R( 4); R( 5); R( 6); R( 7);
+    R( 8); R( 9); R(10); R(11);
+    R(12); R(13); R(14); R(15);
+    */
+  }
+  /* Add the working vars back into context.state[] */
+  /*
+  state[0] += a(0);
+  state[1] += b(0);
+  state[2] += c(0);
+  state[3] += d(0);
+  state[4] += e(0);
+  state[5] += f(0);
+  state[6] += g(0);
+  state[7] += h(0);
+  */
+  for (int i = 0; i < 8; i++)
+    state[i] += T[i];
+  
+  /* Wipe variables */
+  // memset(W, 0, sizeof(W));
+  // memset(T, 0, sizeof(T));
+}
+
+const UINT32 SHA256::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 SHA256::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(m_digest, data32);
+}
+
+void SHA256::Update(const BYTE *data, UINT32 size)
+{
+  UINT32 curBufferPos = UINT32(m_count) & 0x3F;
+  while (size > 0)
+  {
+    while(curBufferPos < 64 && size > 0)
+    {
+      _buffer[curBufferPos++] = *data++;
+      m_count++;
+      size--;
+    }
+    if (curBufferPos == 64)
+    {
+      curBufferPos = 0;
+      WriteByteBlock();
+    }
+  }
+}
+
+void SHA256::Final(BYTE *digest)
+{
+  UINT64 lenInBits = (m_count << 3);
+  UINT32 curBufferPos = UINT32(m_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++ = m_digest[j] >> 24;
+    *digest++ = m_digest[j] >> 16;
+    *digest++ = m_digest[j] >> 8;
+    *digest++ = m_digest[j];
+  }
+  Init();
+}
+
+}}