crypto/signature_creator.h

   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_SIGNATURE_CREATOR_H_
   6 #define CRYPTO_SIGNATURE_CREATOR_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 env_md_ctx_st EVP_MD_CTX;
  14 #elif defined(USE_NSS)
  15 // Forward declaration.
  16 struct SGNContextStr;
  17 #elif defined(OS_MACOSX)
  18 #include <Security/cssm.h>
  19 #endif
  20
  21 #include <vector>
  22
  23 #include "base/basictypes.h"
  24 #include "crypto/crypto_export.h"
  25 #include "crypto/rsa_private_key.h"
  26
  27 #if defined(OS_WIN)
  28 #include "crypto/scoped_capi_types.h"
  29 #endif
  30
  31 namespace crypto {
  32
  33 // Signs data using a bare private key (as opposed to a full certificate).
  34 // Currently can only sign data using SHA-1 with RSA encryption.
  35 class CRYPTO_EXPORT SignatureCreator {
  36  public:
  37   ~SignatureCreator();
  38
  39   // Create an instance. The caller must ensure that the provided PrivateKey
  40   // instance outlives the created SignatureCreator.
  41   static SignatureCreator* Create(RSAPrivateKey* key);
  42
  43   // Update the signature with more data.
  44   bool Update(const uint8* data_part, int data_part_len);
  45
  46   // Finalize the signature.
  47   bool Final(std::vector<uint8>* signature);
  48
  49  private:
  50   // Private constructor. Use the Create() method instead.
  51   SignatureCreator();
  52
  53   RSAPrivateKey* key_;
  54
  55 #if defined(USE_OPENSSL)
  56   EVP_MD_CTX* sign_context_;
  57 #elif defined(USE_NSS)
  58   SGNContextStr* sign_context_;
  59 #elif defined(OS_MACOSX)
  60   CSSM_CC_HANDLE sig_handle_;
  61 #elif defined(OS_WIN)
  62   ScopedHCRYPTHASH hash_object_;
  63 #endif
  64
  65   DISALLOW_COPY_AND_ASSIGN(SignatureCreator);
  66 };
  67
  68 }  // namespace crypto
  69
  70 #endif  // CRYPTO_SIGNATURE_CREATOR_H_