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| 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 <cryptohi.h> | |
| 6 | |
| 7 #include "content/child/webcrypto/crypto_data.h" | |
| 8 #include "content/child/webcrypto/nss/aes_key_nss.h" | |
| 9 #include "content/child/webcrypto/nss/key_nss.h" | |
| 10 #include "content/child/webcrypto/nss/util_nss.h" | |
| 11 #include "content/child/webcrypto/status.h" | |
| 12 #include "content/child/webcrypto/webcrypto_util.h" | |
| 13 #include "crypto/scoped_nss_types.h" | |
| 14 #include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h" | |
| 15 | |
| 16 namespace content { | |
| 17 | |
| 18 namespace webcrypto { | |
| 19 | |
| 20 namespace { | |
| 21 | |
| 22 Status AesCbcEncryptDecrypt(EncryptOrDecrypt mode, | |
| 23 const blink::WebCryptoAlgorithm& algorithm, | |
| 24 const blink::WebCryptoKey& key, | |
| 25 const CryptoData& data, | |
| 26 std::vector<uint8>* buffer) { | |
| 27 const blink::WebCryptoAesCbcParams* params = algorithm.aesCbcParams(); | |
| 28 if (!params) | |
| 29 return Status::ErrorUnexpected(); | |
| 30 | |
| 31 CryptoData iv(params->iv().data(), params->iv().size()); | |
| 32 if (iv.byte_length() != 16) | |
| 33 return Status::ErrorIncorrectSizeAesCbcIv(); | |
| 34 | |
| 35 PK11SymKey* sym_key = SymKeyNss::Cast(key)->key(); | |
| 36 | |
| 37 CK_ATTRIBUTE_TYPE operation = (mode == ENCRYPT) ? CKA_ENCRYPT : CKA_DECRYPT; | |
| 38 | |
| 39 SECItem iv_item = MakeSECItemForBuffer(iv); | |
| 40 | |
| 41 crypto::ScopedSECItem param(PK11_ParamFromIV(CKM_AES_CBC_PAD, &iv_item)); | |
| 42 if (!param) | |
| 43 return Status::OperationError(); | |
| 44 | |
| 45 crypto::ScopedPK11Context context(PK11_CreateContextBySymKey( | |
| 46 CKM_AES_CBC_PAD, operation, sym_key, param.get())); | |
| 47 | |
| 48 if (!context.get()) | |
| 49 return Status::OperationError(); | |
| 50 | |
| 51 // Oddly PK11_CipherOp takes input and output lengths as "int" rather than | |
| 52 // "unsigned int". Do some checks now to avoid integer overflowing. | |
| 53 if (data.byte_length() >= INT_MAX - AES_BLOCK_SIZE) { | |
| 54 // TODO(eroman): Handle this by chunking the input fed into NSS. Right now | |
| 55 // it doesn't make much difference since the one-shot API would end up | |
| 56 // blowing out the memory and crashing anyway. | |
| 57 return Status::ErrorDataTooLarge(); | |
| 58 } | |
| 59 | |
| 60 // PK11_CipherOp does an invalid memory access when given empty decryption | |
| 61 // input, or input which is not a multiple of the block size. See also | |
| 62 // https://bugzilla.mozilla.com/show_bug.cgi?id=921687. | |
| 63 if (operation == CKA_DECRYPT && | |
| 64 (data.byte_length() == 0 || (data.byte_length() % AES_BLOCK_SIZE != 0))) { | |
| 65 return Status::OperationError(); | |
| 66 } | |
| 67 | |
| 68 // TODO(eroman): Refine the output buffer size. It can be computed exactly for | |
| 69 // encryption, and can be smaller for decryption. | |
| 70 unsigned int output_max_len = data.byte_length() + AES_BLOCK_SIZE; | |
| 71 CHECK_GT(output_max_len, data.byte_length()); | |
| 72 | |
| 73 buffer->resize(output_max_len); | |
| 74 | |
| 75 unsigned char* buffer_data = Uint8VectorStart(buffer); | |
| 76 | |
| 77 int output_len; | |
| 78 if (SECSuccess != PK11_CipherOp(context.get(), | |
| 79 buffer_data, | |
| 80 &output_len, | |
| 81 buffer->size(), | |
| 82 data.bytes(), | |
| 83 data.byte_length())) { | |
| 84 return Status::OperationError(); | |
| 85 } | |
| 86 | |
| 87 unsigned int final_output_chunk_len; | |
| 88 if (SECSuccess != PK11_DigestFinal(context.get(), | |
| 89 buffer_data + output_len, | |
| 90 &final_output_chunk_len, | |
| 91 output_max_len - output_len)) { | |
| 92 return Status::OperationError(); | |
| 93 } | |
| 94 | |
| 95 buffer->resize(final_output_chunk_len + output_len); | |
| 96 return Status::Success(); | |
| 97 } | |
| 98 | |
| 99 class AesCbcImplementation : public AesAlgorithm { | |
| 100 public: | |
| 101 AesCbcImplementation() : AesAlgorithm(CKM_AES_CBC, "CBC") {} | |
| 102 | |
| 103 virtual Status Encrypt(const blink::WebCryptoAlgorithm& algorithm, | |
| 104 const blink::WebCryptoKey& key, | |
| 105 const CryptoData& data, | |
| 106 std::vector<uint8>* buffer) const OVERRIDE { | |
| 107 return AesCbcEncryptDecrypt(ENCRYPT, algorithm, key, data, buffer); | |
| 108 } | |
| 109 | |
| 110 virtual Status Decrypt(const blink::WebCryptoAlgorithm& algorithm, | |
| 111 const blink::WebCryptoKey& key, | |
| 112 const CryptoData& data, | |
| 113 std::vector<uint8>* buffer) const OVERRIDE { | |
| 114 return AesCbcEncryptDecrypt(DECRYPT, algorithm, key, data, buffer); | |
| 115 } | |
| 116 }; | |
| 117 | |
| 118 } // namespace | |
| 119 | |
| 120 AlgorithmImplementation* CreatePlatformAesCbcImplementation() { | |
| 121 return new AesCbcImplementation; | |
| 122 } | |
| 123 | |
| 124 } // namespace webcrypto | |
| 125 | |
| 126 } // namespace content | |
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Chromium Code Reviews
Issue 401983002:
Revert 284192 due to a failing test. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src