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crypto/ec_signature_creator.h

Index: crypto/ec_signature_creator.h
diff --git a/crypto/ec_signature_creator.h b/crypto/ec_signature_creator.h
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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 <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "crypto/crypto_export.h"
+
+namespace crypto {
+
+class ECPrivateKey;
+class ECSignatureCreator;
+
+class CRYPTO_EXPORT ECSignatureCreatorFactory {
+ public:
+  virtual ~ECSignatureCreatorFactory() {}
+
+  virtual ECSignatureCreator* Create(ECPrivateKey* key) = 0;
+};
+
+// 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 ECSignatureCreator* Create(ECPrivateKey* key);
+
+  // Set a factory to make the Create function return non-standard
+  // ECSignatureCreator objects.  Because the ECDSA algorithm involves
+  // randomness, this is useful for higher-level tests that want to have
+  // deterministic mocked output to compare.
+  static void SetFactoryForTesting(ECSignatureCreatorFactory* factory);
+
+  // Signs |data_len| bytes from |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(const uint8* data,
+                    int data_len,
+                    std::vector<uint8>* 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>& signature,
+                               std::vector<uint8>* out_raw_sig) = 0;
+};
+
+}  // namespace crypto
+
+#endif  // CRYPTO_EC_SIGNATURE_CREATOR_H_