Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 1 | // Copyright (c) 2012 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 CRYPTO_SIGNATURE_VERIFIER_H_ |
| 6 | #define CRYPTO_SIGNATURE_VERIFIER_H_ |
| 7 | |
| 8 | #include "build/build_config.h" |
| 9 | |
| 10 | #include <vector> |
| 11 | |
| 12 | #include "base/basictypes.h" |
| 13 | #include "crypto/crypto_export.h" |
| 14 | |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 15 | #if defined(USE_OPENSSL) |
| 16 | typedef struct env_md_st EVP_MD; |
| 17 | typedef struct evp_pkey_ctx_st EVP_PKEY_CTX; |
| 18 | #else |
| 19 | typedef struct HASHContextStr HASHContext; |
| 20 | typedef struct SECKEYPublicKeyStr SECKEYPublicKey; |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 21 | typedef struct VFYContextStr VFYContext; |
| 22 | #endif |
| 23 | |
| 24 | namespace crypto { |
| 25 | |
| 26 | // The SignatureVerifier class verifies a signature using a bare public key |
| 27 | // (as opposed to a certificate). |
| 28 | class CRYPTO_EXPORT SignatureVerifier { |
| 29 | public: |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 30 | // The set of supported hash functions. Extend as required. |
| 31 | enum HashAlgorithm { |
| 32 | SHA1, |
| 33 | SHA256, |
| 34 | }; |
| 35 | |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 36 | SignatureVerifier(); |
| 37 | ~SignatureVerifier(); |
| 38 | |
| 39 | // Streaming interface: |
| 40 | |
| 41 | // Initiates a signature verification operation. This should be followed |
| 42 | // by one or more VerifyUpdate calls and a VerifyFinal call. |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 43 | // NOTE: for RSA-PSS signatures, use VerifyInitRSAPSS instead. |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 44 | // |
| 45 | // The signature algorithm is specified as a DER encoded ASN.1 |
| 46 | // AlgorithmIdentifier structure: |
| 47 | // AlgorithmIdentifier ::= SEQUENCE { |
| 48 | // algorithm OBJECT IDENTIFIER, |
| 49 | // parameters ANY DEFINED BY algorithm OPTIONAL } |
| 50 | // |
| 51 | // The signature is encoded according to the signature algorithm, but it |
| 52 | // must not be further encoded in an ASN.1 BIT STRING. |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 53 | // Note: An RSA signature is actually a big integer. It must be in |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 54 | // big-endian byte order. |
| 55 | // |
| 56 | // The public key is specified as a DER encoded ASN.1 SubjectPublicKeyInfo |
| 57 | // structure, which contains not only the public key but also its type |
| 58 | // (algorithm): |
| 59 | // SubjectPublicKeyInfo ::= SEQUENCE { |
| 60 | // algorithm AlgorithmIdentifier, |
| 61 | // subjectPublicKey BIT STRING } |
| 62 | bool VerifyInit(const uint8* signature_algorithm, |
| 63 | int signature_algorithm_len, |
| 64 | const uint8* signature, |
| 65 | int signature_len, |
| 66 | const uint8* public_key_info, |
| 67 | int public_key_info_len); |
| 68 | |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 69 | // Initiates a RSA-PSS signature verification operation. This should be |
| 70 | // followed by one or more VerifyUpdate calls and a VerifyFinal call. |
| 71 | // |
| 72 | // The RSA-PSS signature algorithm parameters are specified with the |
| 73 | // |hash_alg|, |mask_hash_alg|, and |salt_len| arguments. |
| 74 | // |
| 75 | // An RSA-PSS signature is a nonnegative integer encoded as a byte string |
| 76 | // (of the same length as the RSA modulus) in big-endian byte order. It |
| 77 | // must not be further encoded in an ASN.1 BIT STRING. |
| 78 | // |
| 79 | // The public key is specified as a DER encoded ASN.1 SubjectPublicKeyInfo |
| 80 | // structure, which contains not only the public key but also its type |
| 81 | // (algorithm): |
| 82 | // SubjectPublicKeyInfo ::= SEQUENCE { |
| 83 | // algorithm AlgorithmIdentifier, |
| 84 | // subjectPublicKey BIT STRING } |
| 85 | bool VerifyInitRSAPSS(HashAlgorithm hash_alg, |
| 86 | HashAlgorithm mask_hash_alg, |
| 87 | int salt_len, |
| 88 | const uint8* signature, |
| 89 | int signature_len, |
| 90 | const uint8* public_key_info, |
| 91 | int public_key_info_len); |
| 92 | |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 93 | // Feeds a piece of the data to the signature verifier. |
| 94 | void VerifyUpdate(const uint8* data_part, int data_part_len); |
| 95 | |
| 96 | // Concludes a signature verification operation. Returns true if the |
| 97 | // signature is valid. Returns false if the signature is invalid or an |
| 98 | // error occurred. |
| 99 | bool VerifyFinal(); |
| 100 | |
| 101 | // Note: we can provide a one-shot interface if there is interest: |
| 102 | // bool Verify(const uint8* data, |
| 103 | // int data_len, |
| 104 | // const uint8* signature_algorithm, |
| 105 | // int signature_algorithm_len, |
| 106 | // const uint8* signature, |
| 107 | // int signature_len, |
| 108 | // const uint8* public_key_info, |
| 109 | // int public_key_info_len); |
| 110 | |
| 111 | private: |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 112 | #if defined(USE_OPENSSL) |
| 113 | bool CommonInit(const EVP_MD* digest, |
| 114 | const uint8* signature, |
| 115 | int signature_len, |
| 116 | const uint8* public_key_info, |
| 117 | int public_key_info_len, |
| 118 | EVP_PKEY_CTX** pkey_ctx); |
| 119 | #else |
| 120 | static SECKEYPublicKey* DecodePublicKeyInfo(const uint8* public_key_info, |
| 121 | int public_key_info_len); |
| 122 | #endif |
| 123 | |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 124 | void Reset(); |
| 125 | |
| 126 | std::vector<uint8> signature_; |
| 127 | |
| 128 | #if defined(USE_OPENSSL) |
| 129 | struct VerifyContext; |
| 130 | VerifyContext* verify_context_; |
| 131 | #else |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 132 | // Used for all signature types except RSA-PSS. |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 133 | VFYContext* vfy_context_; |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 134 | |
| 135 | // Used for RSA-PSS signatures. |
| 136 | HashAlgorithm hash_alg_; |
| 137 | HashAlgorithm mask_hash_alg_; |
| 138 | unsigned int salt_len_; |
| 139 | SECKEYPublicKey* public_key_; |
| 140 | HASHContext* hash_context_; |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 141 | #endif |
| 142 | }; |
| 143 | |
| 144 | } // namespace crypto |
| 145 | |
| 146 | #endif // CRYPTO_SIGNATURE_VERIFIER_H_ |