content/child/webcrypto/openssl/aes_key_openssl.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/child/webcrypto/openssl/aes_key_openssl.h"
   6
   7 #include "base/logging.h"
   8 #include "content/child/webcrypto/crypto_data.h"
   9 #include "content/child/webcrypto/jwk.h"
  10 #include "content/child/webcrypto/openssl/key_openssl.h"
  11 #include "content/child/webcrypto/openssl/sym_key_openssl.h"
  12 #include "content/child/webcrypto/status.h"
  13 #include "content/child/webcrypto/webcrypto_util.h"
  14 #include "third_party/WebKit/public/platform/WebCryptoKeyAlgorithm.h"
  15
  16 namespace content {
  17
  18 namespace webcrypto {
  19
  20 AesAlgorithm::AesAlgorithm(blink::WebCryptoKeyUsageMask all_key_usages,
  21                            const std::string& jwk_suffix)
  22     : all_key_usages_(all_key_usages), jwk_suffix_(jwk_suffix) {
  23 }
  24
  25 AesAlgorithm::AesAlgorithm(const std::string& jwk_suffix)
  26     : all_key_usages_(blink::WebCryptoKeyUsageEncrypt |
  27                       blink::WebCryptoKeyUsageDecrypt |
  28                       blink::WebCryptoKeyUsageWrapKey |
  29                       blink::WebCryptoKeyUsageUnwrapKey),
  30       jwk_suffix_(jwk_suffix) {
  31 }
  32
  33 Status AesAlgorithm::GenerateKey(const blink::WebCryptoAlgorithm& algorithm,
  34                                  bool extractable,
  35                                  blink::WebCryptoKeyUsageMask usages,
  36                                  GenerateKeyResult* result) const {
  37   Status status = CheckKeyCreationUsages(all_key_usages_, usages, false);
  38   if (status.IsError())
  39     return status;
  40
  41   unsigned int keylen_bits;
  42   status = GetAesKeyGenLengthInBits(algorithm.aesKeyGenParams(), &keylen_bits);
  43   if (status.IsError())
  44     return status;
  45
  46   return GenerateSecretKeyOpenSsl(
  47       blink::WebCryptoKeyAlgorithm::createAes(algorithm.id(), keylen_bits),
  48       extractable, usages, keylen_bits, result);
  49 }
  50
  51 Status AesAlgorithm::VerifyKeyUsagesBeforeImportKey(
  52     blink::WebCryptoKeyFormat format,
  53     blink::WebCryptoKeyUsageMask usages) const {
  54   switch (format) {
  55     case blink::WebCryptoKeyFormatRaw:
  56     case blink::WebCryptoKeyFormatJwk:
  57       return CheckKeyCreationUsages(all_key_usages_, usages, false);
  58     default:
  59       return Status::ErrorUnsupportedImportKeyFormat();
  60   }
  61 }
  62
  63 Status AesAlgorithm::ImportKeyRaw(const CryptoData& key_data,
  64                                   const blink::WebCryptoAlgorithm& algorithm,
  65                                   bool extractable,
  66                                   blink::WebCryptoKeyUsageMask usages,
  67                                   blink::WebCryptoKey* key) const {
  68   const unsigned int keylen_bytes = key_data.byte_length();
  69   Status status = VerifyAesKeyLengthForImport(keylen_bytes);
  70   if (status.IsError())
  71     return status;
  72
  73   // No possibility of overflow.
  74   unsigned int keylen_bits = keylen_bytes * 8;
  75
  76   return ImportKeyRawOpenSsl(key_data, blink::WebCryptoKeyAlgorithm::createAes(
  77                                            algorithm.id(), keylen_bits),
  78                              extractable, usages, key);
  79 }
  80
  81 Status AesAlgorithm::ImportKeyJwk(const CryptoData& key_data,
  82                                   const blink::WebCryptoAlgorithm& algorithm,
  83                                   bool extractable,
  84                                   blink::WebCryptoKeyUsageMask usages,
  85                                   blink::WebCryptoKey* key) const {
  86   std::vector<uint8_t> raw_data;
  87   Status status = ReadAesSecretKeyJwk(key_data, jwk_suffix_, extractable,
  88                                       usages, &raw_data);
  89   if (status.IsError())
  90     return status;
  91
  92   return ImportKeyRaw(CryptoData(raw_data), algorithm, extractable, usages,
  93                       key);
  94 }
  95
  96 Status AesAlgorithm::ExportKeyRaw(const blink::WebCryptoKey& key,
  97                                   std::vector<uint8_t>* buffer) const {
  98   *buffer = SymKeyOpenSsl::Cast(key)->raw_key_data();
  99   return Status::Success();
 100 }
 101
 102 Status AesAlgorithm::ExportKeyJwk(const blink::WebCryptoKey& key,
 103                                   std::vector<uint8_t>* buffer) const {
 104   const std::vector<uint8_t>& raw_data =
 105       SymKeyOpenSsl::Cast(key)->raw_key_data();
 106
 107   WriteSecretKeyJwk(CryptoData(raw_data),
 108                     MakeJwkAesAlgorithmName(jwk_suffix_, raw_data.size()),
 109                     key.extractable(), key.usages(), buffer);
 110
 111   return Status::Success();
 112 }
 113
 114 Status AesAlgorithm::SerializeKeyForClone(
 115     const blink::WebCryptoKey& key,
 116     blink::WebVector<uint8_t>* key_data) const {
 117   key_data->assign(SymKeyOpenSsl::Cast(key)->serialized_key_data());
 118   return Status::Success();
 119 }
 120
 121 Status AesAlgorithm::DeserializeKeyForClone(
 122     const blink::WebCryptoKeyAlgorithm& algorithm,
 123     blink::WebCryptoKeyType type,
 124     bool extractable,
 125     blink::WebCryptoKeyUsageMask usages,
 126     const CryptoData& key_data,
 127     blink::WebCryptoKey* key) const {
 128   return ImportKeyRaw(key_data, CreateAlgorithm(algorithm.id()), extractable,
 129                       usages, key);
 130 }
 131
 132 Status AesAlgorithm::GetKeyLength(
 133     const blink::WebCryptoAlgorithm& key_length_algorithm,
 134     bool* has_length_bits,
 135     unsigned int* length_bits) const {
 136   return GetAesKeyLength(key_length_algorithm, has_length_bits, length_bits);
 137 }
 138
 139 }  // namespace webcrypto
 140
 141 }  // namespace content