crypto/rsa_private_key_openssl.cc

   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 #include "crypto/rsa_private_key.h"
   6
   7 #include <openssl/evp.h>
   8 #include <openssl/pkcs12.h>
   9 #include <openssl/rsa.h>
  10
  11 #include "base/logging.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "crypto/openssl_util.h"
  14
  15 namespace crypto {
  16
  17 namespace {
  18
  19 // Function pointer definition, for injecting the required key export function
  20 // into ExportKey, below. The supplied function should export EVP_PKEY into
  21 // the supplied BIO, returning 1 on success or 0 on failure.
  22 typedef int (ExportFunction)(BIO*, EVP_PKEY*);
  23
  24 // Helper to export |key| into |output| via the specified ExportFunction.
  25 bool ExportKey(EVP_PKEY* key,
  26                ExportFunction export_fn,
  27                std::vector<uint8>* output) {
  28   if (!key)
  29     return false;
  30
  31   OpenSSLErrStackTracer err_tracer(FROM_HERE);
  32   ScopedOpenSSL<BIO, BIO_free_all> bio(BIO_new(BIO_s_mem()));
  33
  34   int res = export_fn(bio.get(), key);
  35   if (!res)
  36     return false;
  37
  38   char* data = NULL;
  39   long len = BIO_get_mem_data(bio.get(), &data);
  40   if (!data || len < 0)
  41     return false;
  42
  43   output->assign(data, data + len);
  44   return true;
  45 }
  46
  47 }  // namespace
  48
  49 // static
  50 RSAPrivateKey* RSAPrivateKey::Create(uint16 num_bits) {
  51   OpenSSLErrStackTracer err_tracer(FROM_HERE);
  52
  53   ScopedOpenSSL<RSA, RSA_free> rsa_key(RSA_new());
  54   ScopedOpenSSL<BIGNUM, BN_free> bn(BN_new());
  55   if (!rsa_key.get() || !bn.get() || !BN_set_word(bn.get(), 65537L))
  56     return NULL;
  57
  58   if (!RSA_generate_key_ex(rsa_key.get(), num_bits, bn.get(), NULL))
  59     return NULL;
  60
  61   scoped_ptr<RSAPrivateKey> result(new RSAPrivateKey);
  62   result->key_ = EVP_PKEY_new();
  63   if (!result->key_ || !EVP_PKEY_set1_RSA(result->key_, rsa_key.get()))
  64     return NULL;
  65
  66   return result.release();
  67 }
  68
  69 // static
  70 RSAPrivateKey* RSAPrivateKey::CreateSensitive(uint16 num_bits) {
  71   NOTIMPLEMENTED();
  72   return NULL;
  73 }
  74
  75 // static
  76 RSAPrivateKey* RSAPrivateKey::CreateFromPrivateKeyInfo(
  77     const std::vector<uint8>& input) {
  78   if (input.empty())
  79     return NULL;
  80
  81   OpenSSLErrStackTracer err_tracer(FROM_HERE);
  82   // BIO_new_mem_buf is not const aware, but it does not modify the buffer.
  83   char* data = reinterpret_cast<char*>(const_cast<uint8*>(&input[0]));
  84   ScopedOpenSSL<BIO, BIO_free_all> bio(BIO_new_mem_buf(data, input.size()));
  85   if (!bio.get())
  86     return NULL;
  87
  88   // Importing is a little more involved than exporting, as we must first
  89   // PKCS#8 decode the input, and then import the EVP_PKEY from Private Key
  90   // Info structure returned.
  91   ScopedOpenSSL<PKCS8_PRIV_KEY_INFO, PKCS8_PRIV_KEY_INFO_free> p8inf(
  92       d2i_PKCS8_PRIV_KEY_INFO_bio(bio.get(), NULL));
  93   if (!p8inf.get())
  94     return NULL;
  95
  96   scoped_ptr<RSAPrivateKey> result(new RSAPrivateKey);
  97   result->key_ = EVP_PKCS82PKEY(p8inf.get());
  98   if (!result->key_)
  99     return NULL;
 100
 101   return result.release();
 102 }
 103
 104 // static
 105 RSAPrivateKey* RSAPrivateKey::CreateSensitiveFromPrivateKeyInfo(
 106     const std::vector<uint8>& input) {
 107   NOTIMPLEMENTED();
 108   return NULL;
 109 }
 110
 111 // static
 112 RSAPrivateKey* RSAPrivateKey::FindFromPublicKeyInfo(
 113     const std::vector<uint8>& input) {
 114   NOTIMPLEMENTED();
 115   return NULL;
 116 }
 117
 118 RSAPrivateKey::RSAPrivateKey()
 119     : key_(NULL) {
 120 }
 121
 122 RSAPrivateKey::~RSAPrivateKey() {
 123   if (key_)
 124     EVP_PKEY_free(key_);
 125 }
 126
 127 bool RSAPrivateKey::ExportPrivateKey(std::vector<uint8>* output) {
 128   return ExportKey(key_, i2d_PKCS8PrivateKeyInfo_bio, output);
 129 }
 130
 131 bool RSAPrivateKey::ExportPublicKey(std::vector<uint8>* output) {
 132   return ExportKey(key_, i2d_PUBKEY_bio, output);
 133 }
 134
 135 }  // namespace crypto