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