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 // Creates a WebArrayBuffer from a uint8 byte array 31 blink::WebArrayBuffer CreateArrayBuffer(const uint8* data, unsigned data_size); 32 33 // This function decodes unpadded 'base64url' encoded data, as described in 34 // RFC4648 (http://www.ietf.org/rfc/rfc4648.txt) Section 5. 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_ 108
