src/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);
  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,
  49       usages,
  50       keylen_bits / 8,
  51       result);
  52 }
  53
  54 Status AesAlgorithm::VerifyKeyUsagesBeforeImportKey(
  55     blink::WebCryptoKeyFormat format,
  56     blink::WebCryptoKeyUsageMask usages) const {
  57   switch (format) {
  58     case blink::WebCryptoKeyFormatRaw:
  59     case blink::WebCryptoKeyFormatJwk:
  60       return CheckKeyCreationUsages(all_key_usages_, usages);
  61     default:
  62       return Status::ErrorUnsupportedImportKeyFormat();
  63   }
  64 }
  65
  66 Status AesAlgorithm::ImportKeyRaw(const CryptoData& key_data,
  67                                   const blink::WebCryptoAlgorithm& algorithm,
  68                                   bool extractable,
  69                                   blink::WebCryptoKeyUsageMask usages,
  70                                   blink::WebCryptoKey* key) const {
  71   const unsigned int keylen_bytes = key_data.byte_length();
  72   Status status = VerifyAesKeyLengthForImport(keylen_bytes);
  73   if (status.IsError())
  74     return status;
  75
  76   // No possibility of overflow.
  77   unsigned int keylen_bits = keylen_bytes * 8;
  78
  79   return ImportKeyRawOpenSsl(
  80       key_data,
  81       blink::WebCryptoKeyAlgorithm::createAes(algorithm.id(), keylen_bits),
  82       extractable,
  83       usages,
  84       key);
  85 }
  86
  87 Status AesAlgorithm::ImportKeyJwk(const CryptoData& key_data,
  88                                   const blink::WebCryptoAlgorithm& algorithm,
  89                                   bool extractable,
  90                                   blink::WebCryptoKeyUsageMask usages,
  91                                   blink::WebCryptoKey* key) const {
  92   std::vector<uint8_t> raw_data;
  93   Status status = ReadAesSecretKeyJwk(
  94       key_data, jwk_suffix_, extractable, usages, &raw_data);
  95   if (status.IsError())
  96     return status;
  97
  98   return ImportKeyRaw(
  99       CryptoData(raw_data), algorithm, extractable, usages, key);
 100 }
 101
 102 Status AesAlgorithm::ExportKeyRaw(const blink::WebCryptoKey& key,
 103                                   std::vector<uint8_t>* buffer) const {
 104   *buffer = SymKeyOpenSsl::Cast(key)->raw_key_data();
 105   return Status::Success();
 106 }
 107
 108 Status AesAlgorithm::ExportKeyJwk(const blink::WebCryptoKey& key,
 109                                   std::vector<uint8_t>* buffer) const {
 110   const std::vector<uint8_t>& raw_data =
 111       SymKeyOpenSsl::Cast(key)->raw_key_data();
 112
 113   WriteSecretKeyJwk(CryptoData(raw_data),
 114                     MakeJwkAesAlgorithmName(jwk_suffix_, raw_data.size()),
 115                     key.extractable(),
 116                     key.usages(),
 117                     buffer);
 118
 119   return Status::Success();
 120 }
 121
 122 }  // namespace webcrypto
 123
 124 }  // namespace content