1 /** \file fake_external_rng_for_test.c
2 *
3 * \brief Helper functions to test PSA crypto functionality.
4 */
5
6 /*
7 * Copyright The Mbed TLS Contributors
8 * SPDX-License-Identifier: Apache-2.0
9 *
10 * Licensed under the Apache License, Version 2.0 (the "License"); you may
11 * not use this file except in compliance with the License.
12 * You may obtain a copy of the License at
13 *
14 * http://www.apache.org/licenses/LICENSE-2.0
15 *
16 * Unless required by applicable law or agreed to in writing, software
17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
19 * See the License for the specific language governing permissions and
20 * limitations under the License.
21 */
22
23 #include <test/fake_external_rng_for_test.h>
24
25 #if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
26 #include <test/random.h>
27 #include <psa/crypto.h>
28
29 static int test_insecure_external_rng_enabled = 0;
30
mbedtls_test_enable_insecure_external_rng(void)31 void mbedtls_test_enable_insecure_external_rng(void)
32 {
33 test_insecure_external_rng_enabled = 1;
34 }
35
mbedtls_test_disable_insecure_external_rng(void)36 void mbedtls_test_disable_insecure_external_rng(void)
37 {
38 test_insecure_external_rng_enabled = 0;
39 }
40
mbedtls_psa_external_get_random(mbedtls_psa_external_random_context_t * context,uint8_t * output,size_t output_size,size_t * output_length)41 psa_status_t mbedtls_psa_external_get_random(
42 mbedtls_psa_external_random_context_t *context,
43 uint8_t *output, size_t output_size, size_t *output_length)
44 {
45 (void) context;
46
47 if (!test_insecure_external_rng_enabled) {
48 return PSA_ERROR_INSUFFICIENT_ENTROPY;
49 }
50
51 /* This implementation is for test purposes only!
52 * Use the libc non-cryptographic random generator. */
53 mbedtls_test_rnd_std_rand(NULL, output, output_size);
54 *output_length = output_size;
55 return PSA_SUCCESS;
56 }
57 #endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
58