/*
 * Copyright 2016 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.
 */

template <typename T, void (*F)(T*)> struct UniquePtrDeleter {
    void operator()(T* p) const { F(p); }
};

typedef UniquePtrDeleter<EVP_PKEY, EVP_PKEY_free> EVP_PKEY_Delete;

#define MAKE_OPENSSL_PTR_TYPE(type)                                                                \
    typedef std::unique_ptr<type, UniquePtrDeleter<type, type##_free>> type##_Ptr;

MAKE_OPENSSL_PTR_TYPE(ASN1_OBJECT)
MAKE_OPENSSL_PTR_TYPE(EVP_PKEY)
MAKE_OPENSSL_PTR_TYPE(RSA)
MAKE_OPENSSL_PTR_TYPE(X509)
MAKE_OPENSSL_PTR_TYPE(BN_CTX)

typedef std::unique_ptr<BIGNUM, UniquePtrDeleter<BIGNUM, BN_free>> BIGNUM_Ptr;

inline const EVP_MD* openssl_digest(android::hardware::keymaster::V3_0::Digest digest) {
    switch (digest) {
    case android::hardware::keymaster::V3_0::Digest::NONE:
        return nullptr;
    case android::hardware::keymaster::V3_0::Digest::MD5:
        return EVP_md5();
    case android::hardware::keymaster::V3_0::Digest::SHA1:
        return EVP_sha1();
    case android::hardware::keymaster::V3_0::Digest::SHA_2_224:
        return EVP_sha224();
    case android::hardware::keymaster::V3_0::Digest::SHA_2_256:
        return EVP_sha256();
    case android::hardware::keymaster::V3_0::Digest::SHA_2_384:
        return EVP_sha384();
    case android::hardware::keymaster::V3_0::Digest::SHA_2_512:
        return EVP_sha512();
    }
    return nullptr;
}