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| 1 // Copyright (c) 2011 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_RSA_PRIVATE_KEY_H_ |
| 6 #define CRYPTO_RSA_PRIVATE_KEY_H_ |
| 7 #pragma once |
| 8 |
| 9 #include "build/build_config.h" |
| 10 |
| 11 #if defined(USE_OPENSSL) |
| 12 // Forward declaration for openssl/*.h |
| 13 typedef struct evp_pkey_st EVP_PKEY; |
| 14 #elif defined(USE_NSS) |
| 15 // Forward declaration. |
| 16 struct SECKEYPrivateKeyStr; |
| 17 struct SECKEYPublicKeyStr; |
| 18 #elif defined(OS_MACOSX) |
| 19 #include <Security/cssm.h> |
| 20 #endif |
| 21 |
| 22 #include <list> |
| 23 #include <vector> |
| 24 |
| 25 #include "base/basictypes.h" |
| 26 |
| 27 #if defined(OS_WIN) |
| 28 #include "crypto/scoped_capi_types.h" |
| 29 #endif |
| 30 #if defined(USE_NSS) |
| 31 #include "base/gtest_prod_util.h" |
| 32 #endif |
| 33 |
| 34 namespace crypto { |
| 35 |
| 36 // Used internally by RSAPrivateKey for serializing and deserializing |
| 37 // PKCS #8 PrivateKeyInfo and PublicKeyInfo. |
| 38 class PrivateKeyInfoCodec { |
| 39 public: |
| 40 |
| 41 // ASN.1 encoding of the AlgorithmIdentifier from PKCS #8. |
| 42 static const uint8 kRsaAlgorithmIdentifier[]; |
| 43 |
| 44 // ASN.1 tags for some types we use. |
| 45 static const uint8 kBitStringTag = 0x03; |
| 46 static const uint8 kIntegerTag = 0x02; |
| 47 static const uint8 kNullTag = 0x05; |
| 48 static const uint8 kOctetStringTag = 0x04; |
| 49 static const uint8 kSequenceTag = 0x30; |
| 50 |
| 51 // |big_endian| here specifies the byte-significance of the integer components |
| 52 // that will be parsed & serialized (modulus(), etc...) during Import(), |
| 53 // Export() and ExportPublicKeyInfo() -- not the ASN.1 DER encoding of the |
| 54 // PrivateKeyInfo/PublicKeyInfo (which is always big-endian). |
| 55 explicit PrivateKeyInfoCodec(bool big_endian); |
| 56 |
| 57 ~PrivateKeyInfoCodec(); |
| 58 |
| 59 // Exports the contents of the integer components to the ASN.1 DER encoding |
| 60 // of the PrivateKeyInfo structure to |output|. |
| 61 bool Export(std::vector<uint8>* output); |
| 62 |
| 63 // Exports the contents of the integer components to the ASN.1 DER encoding |
| 64 // of the PublicKeyInfo structure to |output|. |
| 65 bool ExportPublicKeyInfo(std::vector<uint8>* output); |
| 66 |
| 67 // Exports the contents of the integer components to the ASN.1 DER encoding |
| 68 // of the RSAPublicKey structure to |output|. |
| 69 bool ExportPublicKey(std::vector<uint8>* output); |
| 70 |
| 71 // Parses the ASN.1 DER encoding of the PrivateKeyInfo structure in |input| |
| 72 // and populates the integer components with |big_endian_| byte-significance. |
| 73 // IMPORTANT NOTE: This is currently *not* security-approved for importing |
| 74 // keys from unstrusted sources. |
| 75 bool Import(const std::vector<uint8>& input); |
| 76 |
| 77 // Accessors to the contents of the integer components of the PrivateKeyInfo |
| 78 // structure. |
| 79 std::vector<uint8>* modulus() { return &modulus_; }; |
| 80 std::vector<uint8>* public_exponent() { return &public_exponent_; }; |
| 81 std::vector<uint8>* private_exponent() { return &private_exponent_; }; |
| 82 std::vector<uint8>* prime1() { return &prime1_; }; |
| 83 std::vector<uint8>* prime2() { return &prime2_; }; |
| 84 std::vector<uint8>* exponent1() { return &exponent1_; }; |
| 85 std::vector<uint8>* exponent2() { return &exponent2_; }; |
| 86 std::vector<uint8>* coefficient() { return &coefficient_; }; |
| 87 |
| 88 private: |
| 89 // Utility wrappers for PrependIntegerImpl that use the class's |big_endian_| |
| 90 // value. |
| 91 void PrependInteger(const std::vector<uint8>& in, std::list<uint8>* out); |
| 92 void PrependInteger(uint8* val, int num_bytes, std::list<uint8>* data); |
| 93 |
| 94 // Prepends the integer stored in |val| - |val + num_bytes| with |big_endian| |
| 95 // byte-significance into |data| as an ASN.1 integer. |
| 96 void PrependIntegerImpl(uint8* val, |
| 97 int num_bytes, |
| 98 std::list<uint8>* data, |
| 99 bool big_endian); |
| 100 |
| 101 // Utility wrappers for ReadIntegerImpl that use the class's |big_endian_| |
| 102 // value. |
| 103 bool ReadInteger(uint8** pos, uint8* end, std::vector<uint8>* out); |
| 104 bool ReadIntegerWithExpectedSize(uint8** pos, |
| 105 uint8* end, |
| 106 size_t expected_size, |
| 107 std::vector<uint8>* out); |
| 108 |
| 109 // Reads an ASN.1 integer from |pos|, and stores the result into |out| with |
| 110 // |big_endian| byte-significance. |
| 111 bool ReadIntegerImpl(uint8** pos, |
| 112 uint8* end, |
| 113 std::vector<uint8>* out, |
| 114 bool big_endian); |
| 115 |
| 116 // Prepends the integer stored in |val|, starting a index |start|, for |
| 117 // |num_bytes| bytes onto |data|. |
| 118 void PrependBytes(uint8* val, |
| 119 int start, |
| 120 int num_bytes, |
| 121 std::list<uint8>* data); |
| 122 |
| 123 // Helper to prepend an ASN.1 length field. |
| 124 void PrependLength(size_t size, std::list<uint8>* data); |
| 125 |
| 126 // Helper to prepend an ASN.1 type header. |
| 127 void PrependTypeHeaderAndLength(uint8 type, |
| 128 uint32 length, |
| 129 std::list<uint8>* output); |
| 130 |
| 131 // Helper to prepend an ASN.1 bit string |
| 132 void PrependBitString(uint8* val, int num_bytes, std::list<uint8>* output); |
| 133 |
| 134 // Read an ASN.1 length field. This also checks that the length does not |
| 135 // extend beyond |end|. |
| 136 bool ReadLength(uint8** pos, uint8* end, uint32* result); |
| 137 |
| 138 // Read an ASN.1 type header and its length. |
| 139 bool ReadTypeHeaderAndLength(uint8** pos, |
| 140 uint8* end, |
| 141 uint8 expected_tag, |
| 142 uint32* length); |
| 143 |
| 144 // Read an ASN.1 sequence declaration. This consumes the type header and |
| 145 // length field, but not the contents of the sequence. |
| 146 bool ReadSequence(uint8** pos, uint8* end); |
| 147 |
| 148 // Read the RSA AlgorithmIdentifier. |
| 149 bool ReadAlgorithmIdentifier(uint8** pos, uint8* end); |
| 150 |
| 151 // Read one of the two version fields in PrivateKeyInfo. |
| 152 bool ReadVersion(uint8** pos, uint8* end); |
| 153 |
| 154 // The byte-significance of the stored components (modulus, etc..). |
| 155 bool big_endian_; |
| 156 |
| 157 // Component integers of the PrivateKeyInfo |
| 158 std::vector<uint8> modulus_; |
| 159 std::vector<uint8> public_exponent_; |
| 160 std::vector<uint8> private_exponent_; |
| 161 std::vector<uint8> prime1_; |
| 162 std::vector<uint8> prime2_; |
| 163 std::vector<uint8> exponent1_; |
| 164 std::vector<uint8> exponent2_; |
| 165 std::vector<uint8> coefficient_; |
| 166 |
| 167 DISALLOW_COPY_AND_ASSIGN(PrivateKeyInfoCodec); |
| 168 }; |
| 169 |
| 170 // Encapsulates an RSA private key. Can be used to generate new keys, export |
| 171 // keys to other formats, or to extract a public key. |
| 172 // TODO(hclam): This class should be ref-counted so it can be reused easily. |
| 173 class RSAPrivateKey { |
| 174 public: |
| 175 ~RSAPrivateKey(); |
| 176 |
| 177 // Create a new random instance. Can return NULL if initialization fails. |
| 178 static RSAPrivateKey* Create(uint16 num_bits); |
| 179 |
| 180 // Create a new random instance. Can return NULL if initialization fails. |
| 181 // The created key is permanent and is not exportable in plaintext form. |
| 182 // |
| 183 // NOTE: Currently only available if USE_NSS is defined. |
| 184 static RSAPrivateKey* CreateSensitive(uint16 num_bits); |
| 185 |
| 186 // Create a new instance by importing an existing private key. The format is |
| 187 // an ASN.1-encoded PrivateKeyInfo block from PKCS #8. This can return NULL if |
| 188 // initialization fails. |
| 189 static RSAPrivateKey* CreateFromPrivateKeyInfo( |
| 190 const std::vector<uint8>& input); |
| 191 |
| 192 // Create a new instance by importing an existing private key. The format is |
| 193 // an ASN.1-encoded PrivateKeyInfo block from PKCS #8. This can return NULL if |
| 194 // initialization fails. |
| 195 // The created key is permanent and is not exportable in plaintext form. |
| 196 // |
| 197 // NOTE: Currently only available if USE_NSS is defined. |
| 198 static RSAPrivateKey* CreateSensitiveFromPrivateKeyInfo( |
| 199 const std::vector<uint8>& input); |
| 200 |
| 201 // Import an existing public key, and then search for the private |
| 202 // half in the key database. The format of the public key blob is is |
| 203 // an X509 SubjectPublicKeyInfo block. This can return NULL if |
| 204 // initialization fails or the private key cannot be found. The |
| 205 // caller takes ownership of the returned object, but nothing new is |
| 206 // created in the key database. |
| 207 // |
| 208 // NOTE: Currently only available if USE_NSS is defined. |
| 209 static RSAPrivateKey* FindFromPublicKeyInfo( |
| 210 const std::vector<uint8>& input); |
| 211 |
| 212 #if defined(USE_OPENSSL) |
| 213 EVP_PKEY* key() { return key_; } |
| 214 #elif defined(USE_NSS) |
| 215 SECKEYPrivateKeyStr* key() { return key_; } |
| 216 SECKEYPublicKeyStr* public_key() { return public_key_; } |
| 217 #elif defined(OS_WIN) |
| 218 HCRYPTPROV provider() { return provider_; } |
| 219 HCRYPTKEY key() { return key_; } |
| 220 #elif defined(OS_MACOSX) |
| 221 CSSM_KEY_PTR key() { return &key_; } |
| 222 CSSM_KEY_PTR public_key() { return &public_key_; } |
| 223 #endif |
| 224 |
| 225 // Exports the private key to a PKCS #1 PrivateKey block. |
| 226 bool ExportPrivateKey(std::vector<uint8>* output); |
| 227 |
| 228 // Exports the public key to an X509 SubjectPublicKeyInfo block. |
| 229 bool ExportPublicKey(std::vector<uint8>* output); |
| 230 |
| 231 private: |
| 232 #if defined(USE_NSS) |
| 233 FRIEND_TEST_ALL_PREFIXES(RSAPrivateKeyNSSTest, FindFromPublicKey); |
| 234 FRIEND_TEST_ALL_PREFIXES(RSAPrivateKeyNSSTest, FailedFindFromPublicKey); |
| 235 #endif |
| 236 |
| 237 // Constructor is private. Use one of the Create*() or Find*() |
| 238 // methods above instead. |
| 239 RSAPrivateKey(); |
| 240 |
| 241 // Shared helper for Create() and CreateSensitive(). |
| 242 // TODO(cmasone): consider replacing |permanent| and |sensitive| with a |
| 243 // flags arg created by ORing together some enumerated values. |
| 244 static RSAPrivateKey* CreateWithParams(uint16 num_bits, |
| 245 bool permanent, |
| 246 bool sensitive); |
| 247 |
| 248 // Shared helper for CreateFromPrivateKeyInfo() and |
| 249 // CreateSensitiveFromPrivateKeyInfo(). |
| 250 static RSAPrivateKey* CreateFromPrivateKeyInfoWithParams( |
| 251 const std::vector<uint8>& input, bool permanent, bool sensitive); |
| 252 |
| 253 #if defined(USE_OPENSSL) |
| 254 EVP_PKEY* key_; |
| 255 #elif defined(USE_NSS) |
| 256 SECKEYPrivateKeyStr* key_; |
| 257 SECKEYPublicKeyStr* public_key_; |
| 258 #elif defined(OS_WIN) |
| 259 bool InitProvider(); |
| 260 |
| 261 ScopedHCRYPTPROV provider_; |
| 262 ScopedHCRYPTKEY key_; |
| 263 #elif defined(OS_MACOSX) |
| 264 CSSM_KEY key_; |
| 265 CSSM_KEY public_key_; |
| 266 #endif |
| 267 |
| 268 DISALLOW_COPY_AND_ASSIGN(RSAPrivateKey); |
| 269 }; |
| 270 |
| 271 } // namespace crypto |
| 272 |
| 273 #endif // CRYPTO_RSA_PRIVATE_KEY_H_ |
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