crypto/ec_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_EC_SIGNATURE_CREATOR_H_
   6 #define CRYPTO_EC_SIGNATURE_CREATOR_H_
   7 #pragma once
   8
   9 #include <vector>
  10
  11 #include "base/basictypes.h"
  12 #include "crypto/crypto_export.h"
  13
  14 namespace crypto {
  15
  16 class ECPrivateKey;
  17
  18 // Signs data using a bare private key (as opposed to a full certificate).
  19 // We need this class because SignatureCreator is hardcoded to use
  20 // RSAPrivateKey.
  21 class CRYPTO_EXPORT ECSignatureCreator {
  22  public:
  23   ~ECSignatureCreator();
  24
  25   // Create an instance. The caller must ensure that the provided PrivateKey
  26   // instance outlives the created ECSignatureCreator.
  27   // TODO(rch):  This is currently hard coded to use SHA1. Ideally, we should
  28   // pass in the hash algorithm identifier.
  29   static ECSignatureCreator* Create(ECPrivateKey* key);
  30
  31   // Signs |data_len| bytes from |data| and writes the results into
  32   // |signature| as a DER encoded ECDSA-Sig-Value from RFC 3279.
  33   //
  34   //  ECDSA-Sig-Value ::= SEQUENCE {
  35   //    r     INTEGER,
  36   //    s     INTEGER }
  37   bool Sign(const uint8* data,
  38             int data_len,
  39             std::vector<uint8>* signature);
  40
  41  private:
  42   // Private constructor. Use the Create() method instead.
  43   explicit ECSignatureCreator(ECPrivateKey* key);
  44
  45   ECPrivateKey* key_;
  46
  47   DISALLOW_COPY_AND_ASSIGN(ECSignatureCreator);
  48 };
  49
  50 }  // namespace crypto
  51
  52 #endif  // CRYPTO_EC_SIGNATURE_CREATOR_H_