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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 */ |