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/*
* Copyright 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <utility>
#include <keymaster/km_openssl/asymmetric_key.h>
#include <keymaster/km_openssl/openssl_utils.h>
namespace keymaster {
// OpenSSL uses 64-byte private keys for the APIs in curve25519.h, and the
// first 32 bytes hold the seed (as per RFC 8032). The EVP_PKEY_* functions
// also only expect to deal with the seed.
constexpr int ED25519_SEED_LEN = 32;
// Determine whether the key characteristics indicate the presence of an Ed25519 key.
bool IsEd25519Key(const AuthorizationSet& hw_enforced, const AuthorizationSet& sw_enforced);
// Determine whether the key characteristics indicate the presence of an X25519 key.
bool IsX25519Key(const AuthorizationSet& hw_enforced, const AuthorizationSet& sw_enforced);
class Curve25519Key : public AsymmetricKey {
public:
Curve25519Key(AuthorizationSet hw_enforced, AuthorizationSet sw_enforced,
const KeyFactory* factory)
: AsymmetricKey(std::move(hw_enforced), std::move(sw_enforced), factory) {}
Curve25519Key(AuthorizationSet hw_enforced, AuthorizationSet sw_enforced,
const KeyFactory* factory, const KeymasterKeyBlob& key_material)
: AsymmetricKey(std::move(hw_enforced), std::move(sw_enforced), factory) {
key_material_ = key_material;
}
EVP_PKEY_Ptr InternalToEvp() const override;
bool EvpToInternal(const EVP_PKEY* pkey) override;
};
class Ed25519Key : public Curve25519Key {
public:
using Curve25519Key::Curve25519Key;
int evp_key_type() const override { return EVP_PKEY_ED25519; }
};
class X25519Key : public Curve25519Key {
public:
using Curve25519Key::Curve25519Key;
int evp_key_type() const override { return EVP_PKEY_X25519; }
};
} // namespace keymaster
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