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/*
* Copyright (c) 2022 Bytedance
* Author: lei he <helei.sig11@bytedance.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef QCRYPTO_ASN1_DECODER_H
#define QCRYPTO_ASN1_DECODER_H
#include "qapi/error.h"
/* Simple decoder used to parse DER encoded rsa keys. */
/**
* @opaque: user context.
* @value: the starting address of |value| part of 'Tag-Length-Value' pattern.
* @vlen: length of the |value|.
* Returns: 0 for success, any other value is considered an error.
*/
typedef int (*QCryptoDERDecodeCb) (void *opaque, const uint8_t *value,
size_t vlen, Error **errp);
/**
* qcrypto_der_decode_int:
* @data: pointer to address of input data
* @dlen: pointer to length of input data
* @cb: callback invoked when decode succeed, if cb equals NULL, no
* callback will be invoked
* @opaque: parameter passed to cb
*
* Decode integer from DER-encoded data.
*
* Returns: On success, *data points to rest data, and *dlen
* will be set to the rest length of data, if cb is not NULL, must
* return 0 to make decode success, at last, the length of the data
* part of the decoded INTEGER will be returned. Otherwise, -1 is
* returned.
*/
int qcrypto_der_decode_int(const uint8_t **data,
size_t *dlen,
QCryptoDERDecodeCb cb,
void *opaque,
Error **errp);
/**
* qcrypto_der_decode_seq:
*
* Decode sequence from DER-encoded data, similar with der_decode_int.
*
* @data: pointer to address of input data
* @dlen: pointer to length of input data
* @cb: callback invoked when decode succeed, if cb equals NULL, no
* callback will be invoked
* @opaque: parameter passed to cb
*
* Returns: On success, *data points to rest data, and *dlen
* will be set to the rest length of data, if cb is not NULL, must
* return 0 to make decode success, at last, the length of the data
* part of the decoded SEQUENCE will be returned. Otherwise, -1 is
* returned.
*/
int qcrypto_der_decode_seq(const uint8_t **data,
size_t *dlen,
QCryptoDERDecodeCb cb,
void *opaque,
Error **errp);
#endif /* QCRYPTO_ASN1_DECODER_H */
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