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 "build/build_config.h"
   9
  10 #include <vector>
  11
  12 #include "base/basictypes.h"
  13 #include "crypto/crypto_export.h"
  14
  15 #if defined(USE_OPENSSL)
  16 // Forward declaration for openssl/*.h
  17 typedef struct env_md_ctx_st EVP_MD_CTX;
  18 #elif defined(USE_NSS) || defined(OS_WIN) || defined(OS_MACOSX)
  19 // Forward declaration.
  20 struct SGNContextStr;
  21 #endif
  22
  23 namespace crypto {
  24
  25 class RSAPrivateKey;
  26
  27 // Signs data using a bare private key (as opposed to a full certificate).
  28 // Currently can only sign data using SHA-1 with RSA encryption.
  29 class CRYPTO_EXPORT SignatureCreator {
  30  public:
  31   ~SignatureCreator();
  32
  33   // Create an instance. The caller must ensure that the provided PrivateKey
  34   // instance outlives the created SignatureCreator.
  35   static SignatureCreator* Create(RSAPrivateKey* key);
  36
  37   // Signs the precomputed SHA-1 digest |data| using private |key| as
  38   // specified in PKCS #1 v1.5.
  39   static bool Sign(RSAPrivateKey* key,
  40                    const uint8* data,
  41                    int data_len,
  42                    std::vector<uint8>* signature);
  43
  44   // Update the signature with more data.
  45   bool Update(const uint8* data_part, int data_part_len);
  46
  47   // Finalize the signature.
  48   bool Final(std::vector<uint8>* signature);
  49
  50  private:
  51   // Private constructor. Use the Create() method instead.
  52   SignatureCreator();
  53
  54   RSAPrivateKey* key_;
  55
  56 #if defined(USE_OPENSSL)
  57   EVP_MD_CTX* sign_context_;
  58 #elif defined(USE_NSS) || defined(OS_WIN) || defined(OS_MACOSX)
  59   SGNContextStr* sign_context_;
  60 #endif
  61
  62   DISALLOW_COPY_AND_ASSIGN(SignatureCreator);
  63 };
  64
  65 }  // namespace crypto
  66
  67 #endif  // CRYPTO_SIGNATURE_CREATOR_H_