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| 1 // Copyright (c) 2013 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 #ifndef CONTENT_RENDERER_WEBCRYPTO_WEBCRYPTO_UTIL_H_ |
| 6 #define CONTENT_RENDERER_WEBCRYPTO_WEBCRYPTO_UTIL_H_ |
| 7 |
| 8 #include <map> |
| 9 #include <string> |
| 10 #include <vector> |
| 11 #include "base/basictypes.h" |
| 12 #include "content/common/content_export.h" |
| 13 #include "third_party/WebKit/public/platform/WebArrayBuffer.h" |
| 14 #include "third_party/WebKit/public/platform/WebCryptoAlgorithm.h" |
| 15 |
| 16 namespace content { |
| 17 |
| 18 namespace webcrypto { |
| 19 |
| 20 // Returns a pointer to the start of |data|, or NULL if it is empty. This is a |
| 21 // convenience function for getting the pointer, and should not be used beyond |
| 22 // the expected lifetime of |data|. |
| 23 CONTENT_EXPORT const uint8* Uint8VectorStart(const std::vector<uint8>& data); |
| 24 |
| 25 // Shrinks a WebArrayBuffer to a new size. |
| 26 // TODO(eroman): This works by re-allocating a new buffer. It would be better if |
| 27 // the WebArrayBuffer could just be truncated instead. |
| 28 void ShrinkBuffer(blink::WebArrayBuffer* buffer, unsigned new_size); |
| 29 |
| 30 // This function decodes unpadded 'base64url' encoded data, as described in |
| 31 // RFC4648 (http://www.ietf.org/rfc/rfc4648.txt) Section 5. To do this, first |
| 32 // change the incoming data to 'base64' encoding by applying the appropriate |
| 33 // transformation including adding padding if required, and then call a base64 |
| 34 // decoder. |
| 35 // In Web Crypto, this type of encoding is only used inside JWK. |
| 36 bool Base64DecodeUrlSafe(const std::string& input, std::string* output); |
| 37 |
| 38 // Returns the "hash" param for an algorithm if it exists, otherwise returns |
| 39 // a null algorithm. |
| 40 blink::WebCryptoAlgorithm GetInnerHashAlgorithm( |
| 41 const blink::WebCryptoAlgorithm& algorithm); |
| 42 |
| 43 // Creates a WebCryptoAlgorithm without any parameters. |
| 44 CONTENT_EXPORT blink::WebCryptoAlgorithm CreateAlgorithm( |
| 45 blink::WebCryptoAlgorithmId id); |
| 46 |
| 47 // Creates an HMAC algorithm whose inner hash algorithm is determined by the |
| 48 // specified hash output length. It is an error to call this method with an |
| 49 // unsupported hash output length. |
| 50 blink::WebCryptoAlgorithm CreateHmacAlgorithmByHashOutputLen( |
| 51 unsigned short hash_output_length_bits); |
| 52 |
| 53 // Creates an HMAC algorithm whose inner hash algorithm is determined by the |
| 54 // specified algorithm ID. It is an error to call this method with a hash |
| 55 // algorithm that is not SHA*. |
| 56 CONTENT_EXPORT blink::WebCryptoAlgorithm CreateHmacAlgorithmByHashId( |
| 57 blink::WebCryptoAlgorithmId hash_id); |
| 58 |
| 59 // Creates an HMAC algorithm whose parameters struct is compatible with key |
| 60 // generation. It is an error to call this with a hash_id that is not a SHA*. |
| 61 // The key_length_bytes parameter is optional, with zero meaning unspecified. |
| 62 CONTENT_EXPORT blink::WebCryptoAlgorithm CreateHmacKeyGenAlgorithm( |
| 63 blink::WebCryptoAlgorithmId hash_id, |
| 64 unsigned key_length_bytes); |
| 65 |
| 66 // Creates an RSASSA-PKCS1-v1_5 algorithm. It is an error to call this with a |
| 67 // hash_id that is not a SHA*. |
| 68 blink::WebCryptoAlgorithm CreateRsaSsaAlgorithm( |
| 69 blink::WebCryptoAlgorithmId hash_id); |
| 70 |
| 71 // Creates an RSA-OAEP algorithm. It is an error to call this with a hash_id |
| 72 // that is not a SHA*. |
| 73 blink::WebCryptoAlgorithm CreateRsaOaepAlgorithm( |
| 74 blink::WebCryptoAlgorithmId hash_id); |
| 75 |
| 76 // Creates an RSA algorithm with ID algorithm_id, whose parameters struct is |
| 77 // compatible with key generation. |
| 78 CONTENT_EXPORT blink::WebCryptoAlgorithm CreateRsaKeyGenAlgorithm( |
| 79 blink::WebCryptoAlgorithmId algorithm_id, |
| 80 unsigned modulus_length, |
| 81 const std::vector<uint8>& public_exponent); |
| 82 |
| 83 // Creates an AES-CBC algorithm. |
| 84 CONTENT_EXPORT blink::WebCryptoAlgorithm CreateAesCbcAlgorithm( |
| 85 const std::vector<uint8>& iv); |
| 86 |
| 87 // Creates and AES-GCM algorithm. |
| 88 blink::WebCryptoAlgorithm CreateAesGcmAlgorithm( |
| 89 const std::vector<uint8>& iv, |
| 90 const std::vector<uint8>& additional_data, |
| 91 uint8 tag_length_bytes); |
| 92 |
| 93 // Creates an AES-CBC algorithm whose parameters struct is compatible with key |
| 94 // generation. |
| 95 CONTENT_EXPORT blink::WebCryptoAlgorithm CreateAesCbcKeyGenAlgorithm( |
| 96 unsigned short key_length_bits); |
| 97 |
| 98 // Creates an AES-GCM algorithm whose parameters struct is compatible with key |
| 99 // generation. |
| 100 blink::WebCryptoAlgorithm CreateAesGcmKeyGenAlgorithm( |
| 101 unsigned short key_length_bits); |
| 102 |
| 103 } // namespace webcrypto |
| 104 |
| 105 } // namespace content |
| 106 |
| 107 #endif // CONTENT_RENDERER_WEBCRYPTO_WEBCRYPTO_UTIL_H_ |
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