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#include "crypto/ec_private_key.h" 6 7#include <openssl/ec.h> 8#include <openssl/evp.h> 9#include <openssl/pkcs12.h> 10#include <openssl/x509.h> 11 12#include "base/logging.h" 13#include "base/memory/scoped_ptr.h" 14#include "crypto/openssl_util.h" 15 16namespace crypto { 17 18namespace { 19 20// Function pointer definition, for injecting the required key export function 21// into ExportKeyWithBio, below. |bio| is a temporary memory BIO object, and 22// |key| is a handle to the input key object. Return 1 on success, 0 otherwise. 23// NOTE: Used with OpenSSL functions, which do not comply with the Chromium 24// style guide, hence the unusual parameter placement / types. 25typedef int (*ExportBioFunction)(BIO* bio, const void* key); 26 27// Helper to export |key| into |output| via the specified ExportBioFunction. 28bool ExportKeyWithBio(const void* key, 29 ExportBioFunction export_fn, 30 std::vector<uint8>* output) { 31 if (!key) 32 return false; 33 34 ScopedOpenSSL<BIO, BIO_free_all> bio(BIO_new(BIO_s_mem())); 35 if (!bio.get()) 36 return false; 37 38 if (!export_fn(bio.get(), key)) 39 return false; 40 41 char* data = NULL; 42 long len = BIO_get_mem_data(bio.get(), &data); 43 if (!data || len < 0) 44 return false; 45 46 output->assign(data, data + len); 47 return true; 48} 49 50// Function pointer definition, for injecting the required key export function 51// into ExportKey below. |key| is a pointer to the input key object, 52// and |data| is either NULL, or the address of an 'unsigned char*' pointer 53// that points to the start of the output buffer. The function must return 54// the number of bytes required to export the data, or -1 in case of error. 55typedef int (*ExportDataFunction)(const void* key, unsigned char** data); 56 57// Helper to export |key| into |output| via the specified export function. 58bool ExportKey(const void* key, 59 ExportDataFunction export_fn, 60 std::vector<uint8>* output) { 61 if (!key) 62 return false; 63 64 int data_len = export_fn(key, NULL); 65 if (data_len < 0) 66 return false; 67 68 output->resize(static_cast<size_t>(data_len)); 69 unsigned char* data = &(*output)[0]; 70 if (export_fn(key, &data) < 0) 71 return false; 72 73 return true; 74} 75 76} // namespace 77 78ECPrivateKey::~ECPrivateKey() { 79 if (key_) 80 EVP_PKEY_free(key_); 81} 82 83// static 84bool ECPrivateKey::IsSupported() { return true; } 85 86// static 87ECPrivateKey* ECPrivateKey::Create() { 88 OpenSSLErrStackTracer err_tracer(FROM_HERE); 89 90 ScopedOpenSSL<EC_KEY, EC_KEY_free> ec_key( 91 EC_KEY_new_by_curve_name(NID_X9_62_prime256v1)); 92 if (!ec_key.get() || !EC_KEY_generate_key(ec_key.get())) 93 return NULL; 94 95 scoped_ptr<ECPrivateKey> result(new ECPrivateKey()); 96 result->key_ = EVP_PKEY_new(); 97 if (!result->key_ || !EVP_PKEY_set1_EC_KEY(result->key_, ec_key.get())) 98 return NULL; 99 100 return result.release(); 101} 102 103// static 104ECPrivateKey* ECPrivateKey::CreateFromEncryptedPrivateKeyInfo( 105 const std::string& password, 106 const std::vector<uint8>& encrypted_private_key_info, 107 const std::vector<uint8>& subject_public_key_info) { 108 // NOTE: The |subject_public_key_info| can be ignored here, it is only 109 // useful for the NSS implementation (which uses the public key's SHA1 110 // as a lookup key when storing the private one in its store). 111 if (encrypted_private_key_info.empty()) 112 return NULL; 113 114 OpenSSLErrStackTracer err_tracer(FROM_HERE); 115 // Write the encrypted private key into a memory BIO. 116 char* private_key_data = reinterpret_cast<char*>( 117 const_cast<uint8*>(&encrypted_private_key_info[0])); 118 int private_key_data_len = 119 static_cast<int>(encrypted_private_key_info.size()); 120 ScopedOpenSSL<BIO, BIO_free_all> bio( 121 BIO_new_mem_buf(private_key_data, private_key_data_len)); 122 if (!bio.get()) 123 return NULL; 124 125 // Convert it, then decrypt it into a PKCS#8 object. 126 ScopedOpenSSL<X509_SIG, X509_SIG_free> p8_encrypted( 127 d2i_PKCS8_bio(bio.get(), NULL)); 128 if (!p8_encrypted.get()) 129 return NULL; 130 131 ScopedOpenSSL<PKCS8_PRIV_KEY_INFO, PKCS8_PRIV_KEY_INFO_free> p8_decrypted( 132 PKCS8_decrypt(p8_encrypted.get(), 133 password.c_str(), 134 static_cast<int>(password.size()))); 135 if (!p8_decrypted.get()) 136 return NULL; 137 138 // Create a new EVP_PKEY for it. 139 scoped_ptr<ECPrivateKey> result(new ECPrivateKey); 140 result->key_ = EVP_PKCS82PKEY(p8_decrypted.get()); 141 if (!result->key_) 142 return NULL; 143 144 return result.release(); 145} 146 147bool ECPrivateKey::ExportEncryptedPrivateKey( 148 const std::string& password, 149 int iterations, 150 std::vector<uint8>* output) { 151 OpenSSLErrStackTracer err_tracer(FROM_HERE); 152 // Convert into a PKCS#8 object. 153 ScopedOpenSSL<PKCS8_PRIV_KEY_INFO, PKCS8_PRIV_KEY_INFO_free> pkcs8( 154 EVP_PKEY2PKCS8(key_)); 155 if (!pkcs8.get()) 156 return false; 157 158 // Encrypt the object. 159 // NOTE: NSS uses SEC_OID_PKCS12_V2_PBE_WITH_SHA1_AND_3KEY_TRIPLE_DES_CBC 160 // so use NID_pbe_WithSHA1And3_Key_TripleDES_CBC which should be the OpenSSL 161 // equivalent. 162 ScopedOpenSSL<X509_SIG, X509_SIG_free> encrypted( 163 PKCS8_encrypt(NID_pbe_WithSHA1And3_Key_TripleDES_CBC, 164 NULL, 165 password.c_str(), 166 static_cast<int>(password.size()), 167 NULL, 168 0, 169 iterations, 170 pkcs8.get())); 171 if (!encrypted.get()) 172 return false; 173 174 // Write it into |*output| 175 return ExportKeyWithBio(encrypted.get(), 176 reinterpret_cast<ExportBioFunction>(i2d_PKCS8_bio), 177 output); 178} 179 180bool ECPrivateKey::ExportPublicKey(std::vector<uint8>* output) { 181 OpenSSLErrStackTracer err_tracer(FROM_HERE); 182 return ExportKeyWithBio( 183 key_, reinterpret_cast<ExportBioFunction>(i2d_PUBKEY_bio), output); 184} 185 186bool ECPrivateKey::ExportValue(std::vector<uint8>* output) { 187 OpenSSLErrStackTracer err_tracer(FROM_HERE); 188 ScopedOpenSSL<EC_KEY, EC_KEY_free> ec_key(EVP_PKEY_get1_EC_KEY(key_)); 189 return ExportKey(ec_key.get(), 190 reinterpret_cast<ExportDataFunction>(i2d_ECPrivateKey), 191 output); 192} 193 194bool ECPrivateKey::ExportECParams(std::vector<uint8>* output) { 195 OpenSSLErrStackTracer err_tracer(FROM_HERE); 196 ScopedOpenSSL<EC_KEY, EC_KEY_free> ec_key(EVP_PKEY_get1_EC_KEY(key_)); 197 return ExportKey(ec_key.get(), 198 reinterpret_cast<ExportDataFunction>(i2d_ECParameters), 199 output); 200} 201 202ECPrivateKey::ECPrivateKey() : key_(NULL) {} 203 204} // namespace crypto 205