Remove the CryptoAPI implementation of SHA-1

base/sha1_portable.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/sha1.h"
-
-#include <stddef.h>
-#include <stdint.h>
-#include <string.h>
-
-
-namespace base {
-
-// Implementation of SHA-1. Only handles data in byte-sized blocks,
-// which simplifies the code a fair bit.
-
-// Identifier names follow notation in FIPS PUB 180-3, where you'll
-// also find a description of the algorithm:
-// http://csrc.nist.gov/publications/fips/fips180-3/fips180-3_final.pdf
-
-// Usage example:
-//
-// SecureHashAlgorithm sha;
-// while(there is data to hash)
-//   sha.Update(moredata, size of data);
-// sha.Final();
-// memcpy(somewhere, sha.Digest(), 20);
-//
-// to reuse the instance of sha, call sha.Init();
-
-// TODO(jhawkins): Replace this implementation with a per-platform
-// implementation using each platform's crypto library.  See
-// http://crbug.com/47218
-
-class SecureHashAlgorithm {
- public:
-  SecureHashAlgorithm() { Init(); }
-
-  static const int kDigestSizeBytes;
-
-  void Init();
-  void Update(const void* data, size_t nbytes);
-  void Final();
-
-  // 20 bytes of message digest.
-  const unsigned char* Digest() const {
-    return reinterpret_cast<const unsigned char*>(H);
-  }
-
- private:
-  void Pad();
-  void Process();
-
-  uint32_t A, B, C, D, E;
-
-  uint32_t H[5];
-
-  union {
-    uint32_t W[80];
-    uint8_t M[64];
-  };
-
-  uint32_t cursor;
-  uint64_t l;
-};
-
-static inline uint32_t f(uint32_t t, uint32_t B, uint32_t C, uint32_t D) {
-  if (t < 20) {
-    return (B & C) | ((~B) & D);
-  } else if (t < 40) {
-    return B ^ C ^ D;
-  } else if (t < 60) {
-    return (B & C) | (B & D) | (C & D);
-  } else {
-    return B ^ C ^ D;
-  }
-}
-
-static inline uint32_t S(uint32_t n, uint32_t X) {
-  return (X << n) | (X >> (32-n));
-}
-
-static inline uint32_t K(uint32_t t) {
-  if (t < 20) {
-    return 0x5a827999;
-  } else if (t < 40) {
-    return 0x6ed9eba1;
-  } else if (t < 60) {
-    return 0x8f1bbcdc;
-  } else {
-    return 0xca62c1d6;
-  }
-}
-
-static inline void swapends(uint32_t* t) {
-  *t = (*t >> 24) | ((*t >> 8) & 0xff00) | ((*t & 0xff00) << 8) | (*t << 24);
-}
-
-const int SecureHashAlgorithm::kDigestSizeBytes = 20;
-
-void SecureHashAlgorithm::Init() {
-  A = 0;
-  B = 0;
-  C = 0;
-  D = 0;
-  E = 0;
-  cursor = 0;
-  l = 0;
-  H[0] = 0x67452301;
-  H[1] = 0xefcdab89;
-  H[2] = 0x98badcfe;
-  H[3] = 0x10325476;
-  H[4] = 0xc3d2e1f0;
-}
-
-void SecureHashAlgorithm::Final() {
-  Pad();
-  Process();
-
-  for (int t = 0; t < 5; ++t)
-    swapends(&H[t]);
-}
-
-void SecureHashAlgorithm::Update(const void* data, size_t nbytes) {
-  const uint8_t* d = reinterpret_cast<const uint8_t*>(data);
-  while (nbytes--) {
-    M[cursor++] = *d++;
-    if (cursor >= 64)
-      Process();
-    l += 8;
-  }
-}
-
-void SecureHashAlgorithm::Pad() {
-  M[cursor++] = 0x80;
-
-  if (cursor > 64-8) {
-    // pad out to next block
-    while (cursor < 64)
-      M[cursor++] = 0;
-
-    Process();
-  }
-
-  while (cursor < 64-8)
-    M[cursor++] = 0;
-
-  M[cursor++] = (l >> 56) & 0xff;
-  M[cursor++] = (l >> 48) & 0xff;
-  M[cursor++] = (l >> 40) & 0xff;
-  M[cursor++] = (l >> 32) & 0xff;
-  M[cursor++] = (l >> 24) & 0xff;
-  M[cursor++] = (l >> 16) & 0xff;
-  M[cursor++] = (l >> 8) & 0xff;
-  M[cursor++] = l & 0xff;
-}
-
-void SecureHashAlgorithm::Process() {
-  uint32_t t;
-
-  // Each a...e corresponds to a section in the FIPS 180-3 algorithm.
-
-  // a.
-  //
-  // W and M are in a union, so no need to memcpy.
-  // memcpy(W, M, sizeof(M));
-  for (t = 0; t < 16; ++t)
-    swapends(&W[t]);
-
-  // b.
-  for (t = 16; t < 80; ++t)
-    W[t] = S(1, W[t - 3] ^ W[t - 8] ^ W[t - 14] ^ W[t - 16]);
-
-  // c.
-  A = H[0];
-  B = H[1];
-  C = H[2];
-  D = H[3];
-  E = H[4];
-
-  // d.
-  for (t = 0; t < 80; ++t) {
-    uint32_t TEMP = S(5, A) + f(t, B, C, D) + E + W[t] + K(t);
-    E = D;
-    D = C;
-    C = S(30, B);
-    B = A;
-    A = TEMP;
-  }
-
-  // e.
-  H[0] += A;
-  H[1] += B;
-  H[2] += C;
-  H[3] += D;
-  H[4] += E;
-
-  cursor = 0;
-}
-
-std::string SHA1HashString(const std::string& str) {
-  char hash[SecureHashAlgorithm::kDigestSizeBytes];
-  SHA1HashBytes(reinterpret_cast<const unsigned char*>(str.c_str()),
-                str.length(), reinterpret_cast<unsigned char*>(hash));
-  return std::string(hash, SecureHashAlgorithm::kDigestSizeBytes);
-}
-
-void SHA1HashBytes(const unsigned char* data, size_t len,
-                   unsigned char* hash) {
-  SecureHashAlgorithm sha;
-  sha.Update(data, len);
-  sha.Final();
-
-  memcpy(hash, sha.Digest(), SecureHashAlgorithm::kDigestSizeBytes);
-}
-
-}  // namespace base