crypto/signature_creator.h

   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 #ifndef CRYPTO_SIGNATURE_CREATOR_H_
   6 #define CRYPTO_SIGNATURE_CREATOR_H_
   7
   8 #include <vector>
   9
  10 #include "build/build_config.h"
  11 #include "base/basictypes.h"
  12 #include "crypto/crypto_export.h"
  13
  14 #if defined(USE_OPENSSL)
  15 // Forward declaration for openssl/*.h
  16 typedef struct env_md_ctx_st EVP_MD_CTX;
  17 #elif defined(USE_NSS) || defined(OS_WIN) || defined(OS_MACOSX)
  18 // Forward declaration.
  19 struct SGNContextStr;
  20 #endif
  21
  22 namespace crypto {
  23
  24 class RSAPrivateKey;
  25
  26 // Signs data using a bare private key (as opposed to a full certificate).
  27 // Currently can only sign data using SHA-1 with RSA encryption.
  28 class CRYPTO_EXPORT SignatureCreator {
  29  public:
  30   ~SignatureCreator();
  31
  32   // Create an instance. The caller must ensure that the provided PrivateKey
  33   // instance outlives the created SignatureCreator.
  34   static SignatureCreator* Create(RSAPrivateKey* key);
  35
  36   // Signs the precomputed SHA-1 digest |data| using private |key| as
  37   // specified in PKCS #1 v1.5.
  38   static bool Sign(RSAPrivateKey* key,
  39                    const uint8* data,
  40                    int data_len,
  41                    std::vector<uint8>* signature);
  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) || defined(OS_WIN) || defined(OS_MACOSX)
  58   SGNContextStr* sign_context_;
  59 #endif
  60
  61   DISALLOW_COPY_AND_ASSIGN(SignatureCreator);
  62 };
  63
  64 }  // namespace crypto
  65
  66 #endif  // CRYPTO_SIGNATURE_CREATOR_H_