Move crypto files out of base, to a top level directory.

base/hmac_win.cc

-// Copyright (c) 2010 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/hmac.h"
-
-#include <windows.h>
-#include <wincrypt.h>
-
-#include <algorithm>
-#include <vector>
-
-#include "base/crypto/scoped_capi_types.h"
-#include "base/logging.h"
-#include "base/third_party/nss/blapi.h"
-#include "base/third_party/nss/sha256.h"
-
-namespace base {
-
-namespace {
-
-// Implementation of HMAC-SHA-256:
-//
-// SHA-256 is supported in Windows XP SP3 or later.  We still need to support
-// Windows XP SP2, so unfortunately we have to implement HMAC-SHA-256 here.
-
-enum {
-  SHA256_BLOCK_SIZE = 64  // Block size (in bytes) of the input to SHA-256.
-};
-
-// See FIPS 198: The Keyed-Hash Message Authentication Code (HMAC).
-void ComputeHMACSHA256(const unsigned char* key, size_t key_len,
-                       const unsigned char* text, size_t text_len,
-                       unsigned char* output, size_t output_len) {
-  SHA256Context ctx;
-
-  // Pre-process the key, if necessary.
-  unsigned char key0[SHA256_BLOCK_SIZE];
-  if (key_len > SHA256_BLOCK_SIZE) {
-    SHA256_Begin(&ctx);
-    SHA256_Update(&ctx, key, key_len);
-    SHA256_End(&ctx, key0, NULL, SHA256_LENGTH);
-    memset(key0 + SHA256_LENGTH, 0, SHA256_BLOCK_SIZE - SHA256_LENGTH);
-  } else {
-    memcpy(key0, key, key_len);
-    memset(key0 + key_len, 0, SHA256_BLOCK_SIZE - key_len);
-  }
-
-  unsigned char padded_key[SHA256_BLOCK_SIZE];
-  unsigned char inner_hash[SHA256_LENGTH];
-
-  // XOR key0 with ipad.
-  for (int i = 0; i < SHA256_BLOCK_SIZE; ++i)
-    padded_key[i] = key0[i] ^ 0x36;
-
-  // Compute the inner hash.
-  SHA256_Begin(&ctx);
-  SHA256_Update(&ctx, padded_key, SHA256_BLOCK_SIZE);
-  SHA256_Update(&ctx, text, text_len);
-  SHA256_End(&ctx, inner_hash, NULL, SHA256_LENGTH);
-
-  // XOR key0 with opad.
-  for (int i = 0; i < SHA256_BLOCK_SIZE; ++i)
-    padded_key[i] = key0[i] ^ 0x5c;
-
-  // Compute the outer hash.
-  SHA256_Begin(&ctx);
-  SHA256_Update(&ctx, padded_key, SHA256_BLOCK_SIZE);
-  SHA256_Update(&ctx, inner_hash, SHA256_LENGTH);
-  SHA256_End(&ctx, output, NULL, output_len);
-}
-
-}  // namespace
-
-struct HMACPlatformData {
-  ~HMACPlatformData() {
-    if (!raw_key_.empty()) {
-      SecureZeroMemory(&raw_key_[0], raw_key_.size());
-    }
-
-    // Destroy the key before releasing the provider.
-    key_.reset();
-  }
-
-  ScopedHCRYPTPROV provider_;
-  ScopedHCRYPTKEY key_;
-
-  // For HMAC-SHA-256 only.
-  std::vector<unsigned char> raw_key_;
-};
-
-HMAC::HMAC(HashAlgorithm hash_alg)
-    : hash_alg_(hash_alg), plat_(new HMACPlatformData()) {
-  // Only SHA-1 and SHA-256 hash algorithms are supported now.
-  DCHECK(hash_alg_ == SHA1 || hash_alg_ == SHA256);
-}
-
-bool HMAC::Init(const unsigned char* key, int key_length) {
-  if (plat_->provider_ || plat_->key_ || !plat_->raw_key_.empty()) {
-    // Init must not be called more than once on the same HMAC object.
-    NOTREACHED();
-    return false;
-  }
-
-  if (hash_alg_ == SHA256) {
-    if (key_length < SHA256_LENGTH / 2)
-      return false;  // Key is too short.
-    plat_->raw_key_.assign(key, key + key_length);
-    return true;
-  }
-
-  if (!CryptAcquireContext(plat_->provider_.receive(), NULL, NULL,
-                           PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
-    NOTREACHED();
-    return false;
-  }
-
-  // This code doesn't work on Win2k because PLAINTEXTKEYBLOB and
-  // CRYPT_IPSEC_HMAC_KEY are not supported on Windows 2000.  PLAINTEXTKEYBLOB
-  // allows the import of an unencrypted key.  For Win2k support, a cubmbersome
-  // exponent-of-one key procedure must be used:
-  //     http://support.microsoft.com/kb/228786/en-us
-  // CRYPT_IPSEC_HMAC_KEY allows keys longer than 16 bytes.
-
-  struct KeyBlob {
-    BLOBHEADER header;
-    DWORD key_size;
-    BYTE key_data[1];
-  };
-  size_t key_blob_size = std::max(offsetof(KeyBlob, key_data) + key_length,
-                                  sizeof(KeyBlob));
-  std::vector<BYTE> key_blob_storage = std::vector<BYTE>(key_blob_size);
-  KeyBlob* key_blob = reinterpret_cast<KeyBlob*>(&key_blob_storage[0]);
-  key_blob->header.bType = PLAINTEXTKEYBLOB;
-  key_blob->header.bVersion = CUR_BLOB_VERSION;
-  key_blob->header.reserved = 0;
-  key_blob->header.aiKeyAlg = CALG_RC2;
-  key_blob->key_size = key_length;
-  memcpy(key_blob->key_data, key, key_length);
-
-  if (!CryptImportKey(plat_->provider_, &key_blob_storage[0],
-                      key_blob_storage.size(), 0, CRYPT_IPSEC_HMAC_KEY,
-                      plat_->key_.receive())) {
-    NOTREACHED();
-    return false;
-  }
-
-  // Destroy the copy of the key.
-  SecureZeroMemory(key_blob->key_data, key_length);
-
-  return true;
-}
-
-HMAC::~HMAC() {
-}
-
-bool HMAC::Sign(const std::string& data,
-                unsigned char* digest,
-                int digest_length) {
-  if (hash_alg_ == SHA256) {
-    if (plat_->raw_key_.empty())
-      return false;
-    ComputeHMACSHA256(&plat_->raw_key_[0], plat_->raw_key_.size(),
-                      reinterpret_cast<const unsigned char*>(data.data()),
-                      data.size(), digest, digest_length);
-    return true;
-  }
-
-  if (!plat_->provider_ || !plat_->key_)
-    return false;
-
-  if (hash_alg_ != SHA1) {
-    NOTREACHED();
-    return false;
-  }
-
-  ScopedHCRYPTHASH hash;
-  if (!CryptCreateHash(plat_->provider_, CALG_HMAC, plat_->key_, 0,
-                       hash.receive()))
-    return false;
-
-  HMAC_INFO hmac_info;
-  memset(&hmac_info, 0, sizeof(hmac_info));
-  hmac_info.HashAlgid = CALG_SHA1;
-  if (!CryptSetHashParam(hash, HP_HMAC_INFO,
-                         reinterpret_cast<BYTE*>(&hmac_info), 0))
-    return false;
-
-  if (!CryptHashData(hash, reinterpret_cast<const BYTE*>(data.data()),
-                     static_cast<DWORD>(data.size()), 0))
-    return false;
-
-  DWORD sha1_size = digest_length;
-  return !!CryptGetHashParam(hash, HP_HASHVAL, digest, &sha1_size, 0);
-}
-
-}  // namespace base