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::CreateFromPrivateKeyInfo(
  71     const std::vector<uint8>& input) {
  72   if (input.empty())
  73     return NULL;
  74
  75   OpenSSLErrStackTracer err_tracer(FROM_HERE);
  76   // BIO_new_mem_buf is not const aware, but it does not modify the buffer.
  77   char* data = reinterpret_cast<char*>(const_cast<uint8*>(&input[0]));
  78   ScopedOpenSSL<BIO, BIO_free_all> bio(BIO_new_mem_buf(data, input.size()));
  79   if (!bio.get())
  80     return NULL;
  81
  82   // Importing is a little more involved than exporting, as we must first
  83   // PKCS#8 decode the input, and then import the EVP_PKEY from Private Key
  84   // Info structure returned.
  85   ScopedOpenSSL<PKCS8_PRIV_KEY_INFO, PKCS8_PRIV_KEY_INFO_free> p8inf(
  86       d2i_PKCS8_PRIV_KEY_INFO_bio(bio.get(), NULL));
  87   if (!p8inf.get())
  88     return NULL;
  89
  90   scoped_ptr<RSAPrivateKey> result(new RSAPrivateKey);
  91   result->key_ = EVP_PKCS82PKEY(p8inf.get());
  92   if (!result->key_)
  93     return NULL;
  94
  95   return result.release();
  96 }
  97
  98 RSAPrivateKey::RSAPrivateKey()
  99     : key_(NULL) {
 100 }
 101
 102 RSAPrivateKey::~RSAPrivateKey() {
 103   if (key_)
 104     EVP_PKEY_free(key_);
 105 }
 106
 107 RSAPrivateKey* RSAPrivateKey::Copy() const {
 108   scoped_ptr<RSAPrivateKey> copy(new RSAPrivateKey());
 109   RSA* rsa = EVP_PKEY_get1_RSA(key_);
 110   if (!rsa)
 111     return NULL;
 112   copy->key_ = EVP_PKEY_new();
 113   if (!EVP_PKEY_set1_RSA(copy->key_, rsa))
 114     return NULL;
 115   return copy.release();
 116 }
 117
 118 bool RSAPrivateKey::ExportPrivateKey(std::vector<uint8>* output) const {
 119   return ExportKey(key_, i2d_PKCS8PrivateKeyInfo_bio, output);
 120 }
 121
 122 bool RSAPrivateKey::ExportPublicKey(std::vector<uint8>* output) const {
 123   return ExportKey(key_, i2d_PUBKEY_bio, output);
 124 }
 125
 126 }  // namespace crypto