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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_EC_SIGNATURE_CREATOR_H_
- #define CRYPTO_EC_SIGNATURE_CREATOR_H_
- #include <stdint.h>
- #include <memory>
- #include <string>
- #include <vector>
- #include "base/containers/span.h"
- #include "crypto/crypto_export.h"
- namespace crypto {
- class ECPrivateKey;
- class ECSignatureCreator;
- // Signs data using a bare private key (as opposed to a full certificate).
- // We need this class because SignatureCreator is hardcoded to use
- // RSAPrivateKey.
- class CRYPTO_EXPORT ECSignatureCreator {
- public:
- virtual ~ECSignatureCreator() {}
- // Create an instance. The caller must ensure that the provided PrivateKey
- // instance outlives the created ECSignatureCreator.
- // TODO(rch): This is currently hard coded to use SHA256. Ideally, we should
- // pass in the hash algorithm identifier.
- static std::unique_ptr<ECSignatureCreator> Create(ECPrivateKey* key);
- // Signs |data| and writes the results into |signature| as a DER encoded
- // ECDSA-Sig-Value from RFC 3279.
- //
- // ECDSA-Sig-Value ::= SEQUENCE {
- // r INTEGER,
- // s INTEGER }
- virtual bool Sign(base::span<const uint8_t> data,
- std::vector<uint8_t>* signature) = 0;
- // DecodeSignature converts from a DER encoded ECDSA-Sig-Value (as produced
- // by Sign) to a `raw' ECDSA signature which consists of a pair of
- // big-endian, zero-padded, 256-bit integers, r and s. On success it returns
- // true and puts the raw signature into |out_raw_sig|.
- // (Only P-256 signatures are supported.)
- virtual bool DecodeSignature(const std::vector<uint8_t>& signature,
- std::vector<uint8_t>* out_raw_sig) = 0;
- };
- } // namespace crypto
- #endif // CRYPTO_EC_SIGNATURE_CREATOR_H_
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