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// Copyright 2015 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 NET_SSL_SSL_PRIVATE_KEY_H_
#define NET_SSL_SSL_PRIVATE_KEY_H_
#include <stdint.h>
#include <vector>
#include "base/callback_forward.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/string_piece.h"
#include "net/base/net_errors.h"
namespace net {
// An interface for a private key for use with SSL client authentication.
class SSLPrivateKey {
public:
using SignCallback = base::Callback<void(Error, const std::vector<uint8_t>&)>;
enum class Type {
RSA,
ECDSA,
};
enum class Hash {
MD5_SHA1,
SHA1,
SHA256,
SHA384,
SHA512,
};
SSLPrivateKey() {}
virtual ~SSLPrivateKey() {}
// Returns whether the key is an RSA key or an ECDSA key. Although the signing
// interface is type-agnositic and type tags in interfaces are discouraged,
// TLS has key-specific logic in selecting which hashes to sign. Exposing the
// key type avoids replicating BoringSSL's TLS-specific logic in SSLPrivateKey
// implementations and complicating the interface between Chromium and
// BoringSSL.
virtual Type GetType() = 0;
// Returns the digests that are supported by the key in decreasing preference.
virtual std::vector<SSLPrivateKey::Hash> GetDigestPreferences() = 0;
// Returns the maximum size of a signature, in bytes. For an RSA key, this
// must be the size of the modulus.
virtual size_t GetMaxSignatureLengthInBytes() = 0;
// Asynchronously signs an |input| which was computed with the hash |hash|. On
// completion, it calls |callback| with the signature or an error code if the
// operation failed. For an RSA key, the signature is a PKCS#1 signature. The
// SSLPrivateKey implementation is responsible for prepending the DigestInfo
// prefix and adding PKCS#1 padding.
virtual void SignDigest(Hash hash,
const base::StringPiece& input,
const SignCallback& callback) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(SSLPrivateKey);
};
} // namespace net
#endif // NET_SSL_SSL_PRIVATE_KEY_H_
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