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69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CRYPTO_EC_SIGNATURE_CREATOR_H_
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#define CRYPTO_EC_SIGNATURE_CREATOR_H_
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#include <stdint.h>
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#include <memory>
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#include <string>
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#include <vector>
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#include "crypto/crypto_export.h"
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namespace crypto {
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class ECPrivateKey;
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class ECSignatureCreator;
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class CRYPTO_EXPORT ECSignatureCreatorFactory {
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public:
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virtual ~ECSignatureCreatorFactory() {}
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virtual std::unique_ptr<ECSignatureCreator> Create(ECPrivateKey* key) = 0;
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};
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// Signs data using a bare private key (as opposed to a full certificate).
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// We need this class because SignatureCreator is hardcoded to use
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// RSAPrivateKey.
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class CRYPTO_EXPORT ECSignatureCreator {
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public:
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virtual ~ECSignatureCreator() {}
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// Create an instance. The caller must ensure that the provided PrivateKey
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// instance outlives the created ECSignatureCreator.
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// TODO(rch): This is currently hard coded to use SHA256. Ideally, we should
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// pass in the hash algorithm identifier.
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static std::unique_ptr<ECSignatureCreator> Create(ECPrivateKey* key);
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// Set a factory to make the Create function return non-standard
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// ECSignatureCreator objects. Because the ECDSA algorithm involves
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// randomness, this is useful for higher-level tests that want to have
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// deterministic mocked output to compare.
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static void SetFactoryForTesting(ECSignatureCreatorFactory* factory);
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// Signs |data_len| bytes from |data| and writes the results into
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// |signature| as a DER encoded ECDSA-Sig-Value from RFC 3279.
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//
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// ECDSA-Sig-Value ::= SEQUENCE {
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// r INTEGER,
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// s INTEGER }
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virtual bool Sign(const uint8_t* data,
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int data_len,
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std::vector<uint8_t>* signature) = 0;
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// DecodeSignature converts from a DER encoded ECDSA-Sig-Value (as produced
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// by Sign) to a `raw' ECDSA signature which consists of a pair of
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// big-endian, zero-padded, 256-bit integers, r and s. On success it returns
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// true and puts the raw signature into |out_raw_sig|.
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// (Only P-256 signatures are supported.)
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virtual bool DecodeSignature(const std::vector<uint8_t>& signature,
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std::vector<uint8_t>* out_raw_sig) = 0;
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};
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} // namespace crypto
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#endif // CRYPTO_EC_SIGNATURE_CREATOR_H_
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