1/** Helper functions for tests that manipulate ASN.1 data.
2 */
3/*
4 *  Copyright The Mbed TLS Contributors
5 *  SPDX-License-Identifier: Apache-2.0
6 *
7 *  Licensed under the Apache License, Version 2.0 (the "License"); you may
8 *  not use this file except in compliance with the License.
9 *  You may obtain a copy of the License at
10 *
11 *  http://www.apache.org/licenses/LICENSE-2.0
12 *
13 *  Unless required by applicable law or agreed to in writing, software
14 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 *  See the License for the specific language governing permissions and
17 *  limitations under the License.
18 */
19
20#ifndef ASN1_HELPERS_H
21#define ASN1_HELPERS_H
22
23#include "test/helpers.h"
24
25/** Skip past an INTEGER in an ASN.1 buffer.
26 *
27 * Mark the current test case as failed in any of the following conditions:
28 * - The buffer does not start with an ASN.1 INTEGER.
29 * - The integer's size or parity does not match the constraints expressed
30 *   through \p min_bits, \p max_bits and \p must_be_odd.
31 *
32 * \param p             Upon entry, `*p` points to the first byte of the
33 *                      buffer to parse.
34 *                      On successful return, `*p` points to the first byte
35 *                      after the parsed INTEGER.
36 *                      On failure, `*p` is unspecified.
37 * \param end           The end of the ASN.1 buffer.
38 * \param min_bits      Fail the test case if the integer does not have at
39 *                      least this many significant bits.
40 * \param max_bits      Fail the test case if the integer has more than
41 *                      this many significant bits.
42 * \param must_be_odd   Fail the test case if the integer is even.
43 *
44 * \return              \c 0 if the test failed, otherwise 1.
45 */
46int mbedtls_test_asn1_skip_integer(unsigned char **p, const unsigned char *end,
47                                   size_t min_bits, size_t max_bits,
48                                   int must_be_odd);
49
50#endif /* ASN1_HELPERS_H */
51