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// Copyright 2012 The Chromium Authors
// 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 <stdint.h>
#include <memory>
#include <vector>
#include "base/memory/raw_ptr.h"
#include "build/build_config.h"
#include "crypto/crypto_export.h"
#include "third_party/boringssl/src/include/openssl/base.h"
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(const SignatureCreator&) = delete;
SignatureCreator& operator=(const SignatureCreator&) = delete;
~SignatureCreator();
// Create an instance. The caller must ensure that the provided PrivateKey
// instance outlives the created SignatureCreator. Uses the HashAlgorithm
// specified.
static std::unique_ptr<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_t* data,
int data_len,
std::vector<uint8_t>* signature);
// Update the signature with more data.
bool Update(const uint8_t* data_part, int data_part_len);
// Finalize the signature.
bool Final(std::vector<uint8_t>* signature);
private:
// Private constructor. Use the Create() method instead.
SignatureCreator();
raw_ptr<EVP_MD_CTX> sign_context_;
};
} // namespace crypto
#endif // CRYPTO_SIGNATURE_CREATOR_H_
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