libavb/avb_rsa.h

/*
 * Copyright (C) 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.
 */

/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifdef AVB_INSIDE_LIBAVB_H
#error "You can't include avb_rsa.h in the public header libavb.h."
#endif

#ifndef AVB_COMPILATION
#error "Never include this file, it may only be used from internal avb code."
#endif

#ifndef AVB_RSA_H_
#define AVB_RSA_H_

#ifdef __cplusplus
extern "C" {
#endif

#include "avb_sysdeps.h"

/* Size of a RSA-2048 signature. */
#define AVB_RSA2048_NUM_BYTES 256

/* Size of a RSA-4096 signature. */
#define AVB_RSA4096_NUM_BYTES 512

/* Size of a RSA-8192 signature. */
#define AVB_RSA8192_NUM_BYTES 1024

/* Using the key given by |key|, verify a RSA signature |sig| of
 * length |sig_num_bytes| against an expected |hash| of length
 * |hash_num_bytes|. The padding to expect must be passed in using
 * |padding| of length |padding_num_bytes|.
 *
 * The data in |key| must match the format defined in
 * |AvbRSAPublicKeyHeader|, including the two large numbers
 * following. The |key_num_bytes| must be the size of the entire
 * serialized key.
 *
 * Returns false if verification fails, true otherwise.
 */
bool avb_rsa_verify(const uint8_t* key, size_t key_num_bytes,
                    const uint8_t* sig, size_t sig_num_bytes,
                    const uint8_t* hash, size_t hash_num_bytes,
                    const uint8_t* padding,
                    size_t padding_num_bytes) AVB_ATTR_WARN_UNUSED_RESULT;

#ifdef __cplusplus
}
#endif

#endif /* AVB_RSA_H_ */