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|---|---|---|
| 99d423f1 LH |
1 | /* |
| 2 | * Copyright (c) 2022 Bytedance | |
| 3 | * Author: lei he <helei.sig11@bytedance.com> | |
| 4 | * | |
| 5 | * This library is free software; you can redistribute it and/or | |
| 6 | * modify it under the terms of the GNU Lesser General Public | |
| 7 | * License as published by the Free Software Foundation; either | |
| 8 | * version 2.1 of the License, or (at your option) any later version. | |
| 9 | * | |
| 10 | * This library is distributed in the hope that it will be useful, | |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | * Lesser General Public License for more details. | |
| 14 | * | |
| 15 | * You should have received a copy of the GNU Lesser General Public | |
| 16 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. | |
| 17 | * | |
| 18 | */ | |
| 19 | ||
| 20 | #ifndef QCRYPTO_ASN1_DECODER_H | |
| 21 | #define QCRYPTO_ASN1_DECODER_H | |
| 22 | ||
| 23 | #include "qapi/error.h" | |
| 24 | ||
| 25 | /* Simple decoder used to parse DER encoded rsa keys. */ | |
| 26 | ||
| 27 | /** | |
| 28 | * @opaque: user context. | |
| 29 | * @value: the starting address of |value| part of 'Tag-Length-Value' pattern. | |
| 30 | * @vlen: length of the |value|. | |
| 31 | * Returns: 0 for success, any other value is considered an error. | |
| 32 | */ | |
| 33 | typedef int (*QCryptoDERDecodeCb) (void *opaque, const uint8_t *value, | |
| 34 | size_t vlen, Error **errp); | |
| 35 | ||
| 36 | /** | |
| 37 | * qcrypto_der_decode_int: | |
| 38 | * @data: pointer to address of input data | |
| 39 | * @dlen: pointer to length of input data | |
| 40 | * @cb: callback invoked when decode succeed, if cb equals NULL, no | |
| 41 | * callback will be invoked | |
| 42 | * @opaque: parameter passed to cb | |
| 43 | * | |
| 44 | * Decode integer from DER-encoded data. | |
| 45 | * | |
| 46 | * Returns: On success, *data points to rest data, and *dlen | |
| 47 | * will be set to the rest length of data, if cb is not NULL, must | |
| 48 | * return 0 to make decode success, at last, the length of the data | |
| 49 | * part of the decoded INTEGER will be returned. Otherwise, -1 is | |
| 50 | * returned. | |
| 51 | */ | |
| 52 | int qcrypto_der_decode_int(const uint8_t **data, | |
| 53 | size_t *dlen, | |
| 54 | QCryptoDERDecodeCb cb, | |
| 55 | void *opaque, | |
| 56 | Error **errp); | |
| 57 | ||
| 58 | /** | |
| 59 | * qcrypto_der_decode_seq: | |
| 60 | * | |
| 61 | * Decode sequence from DER-encoded data, similar with der_decode_int. | |
| 62 | * | |
| 63 | * @data: pointer to address of input data | |
| 64 | * @dlen: pointer to length of input data | |
| 65 | * @cb: callback invoked when decode succeed, if cb equals NULL, no | |
| 66 | * callback will be invoked | |
| 67 | * @opaque: parameter passed to cb | |
| 68 | * | |
| 69 | * Returns: On success, *data points to rest data, and *dlen | |
| 70 | * will be set to the rest length of data, if cb is not NULL, must | |
| 71 | * return 0 to make decode success, at last, the length of the data | |
| 72 | * part of the decoded SEQUENCE will be returned. Otherwise, -1 is | |
| 73 | * returned. | |
| 74 | */ | |
| 75 | int qcrypto_der_decode_seq(const uint8_t **data, | |
| 76 | size_t *dlen, | |
| 77 | QCryptoDERDecodeCb cb, | |
| 78 | void *opaque, | |
| 79 | Error **errp); | |
| 80 | ||
| 81 | #endif /* QCRYPTO_ASN1_DECODER_H */ |