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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CRYPTO_SIGNATURE_CREATOR_H_
#define CRYPTO_SIGNATURE_CREATOR_H_
#include <vector>
#include "build/build_config.h"
#include "base/basictypes.h"
#include "crypto/crypto_export.h"
#if defined(USE_OPENSSL)
// Forward declaration for openssl/*.h
typedef struct env_md_ctx_st EVP_MD_CTX;
#elif defined(USE_NSS_CERTS) || defined(OS_WIN) || defined(OS_MACOSX)
// Forward declaration.
struct SGNContextStr;
#endif
namespace crypto {
class RSAPrivateKey;
// Signs data using a bare private key (as opposed to a full certificate).
// Currently can only sign data using SHA-1 or SHA-256 with RSA PKCS#1v1.5.
class CRYPTO_EXPORT SignatureCreator {
public:
// The set of supported hash functions. Extend as required.
enum HashAlgorithm {
SHA1,
SHA256,
};
~SignatureCreator();
// Create an instance. The caller must ensure that the provided PrivateKey
// instance outlives the created SignatureCreator. Uses the HashAlgorithm
// specified.
static SignatureCreator* Create(RSAPrivateKey* key, HashAlgorithm hash_alg);
// Signs the precomputed |hash_alg| digest |data| using private |key| as
// specified in PKCS #1 v1.5.
static bool Sign(RSAPrivateKey* key,
HashAlgorithm hash_alg,
const uint8* data,
int data_len,
std::vector<uint8>* signature);
// Update the signature with more data.
bool Update(const uint8* data_part, int data_part_len);
// Finalize the signature.
bool Final(std::vector<uint8>* signature);
private:
// Private constructor. Use the Create() method instead.
SignatureCreator();
#if defined(USE_OPENSSL)
EVP_MD_CTX* sign_context_;
#elif defined(USE_NSS_CERTS) || defined(OS_WIN) || defined(OS_MACOSX)
SGNContextStr* sign_context_;
#endif
DISALLOW_COPY_AND_ASSIGN(SignatureCreator);
};
} // namespace crypto
#endif // CRYPTO_SIGNATURE_CREATOR_H_
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