1/* BEGIN_HEADER */
2#include "mbedtls/chacha20.h"
3/* END_HEADER */
4
5/* BEGIN_DEPENDENCIES
6 * depends_on:MBEDTLS_CHACHA20_C
7 * END_DEPENDENCIES
8 */
9
10/* BEGIN_CASE */
11void chacha20_crypt(data_t *key_str,
12                    data_t *nonce_str,
13                    int counter,
14                    data_t *src_str,
15                    data_t *expected_output_str)
16{
17    unsigned char output[375];
18    mbedtls_chacha20_context ctx;
19
20    memset(output, 0x00, sizeof(output));
21
22    TEST_ASSERT(src_str->len   == expected_output_str->len);
23    TEST_ASSERT(key_str->len   == 32U);
24    TEST_ASSERT(nonce_str->len == 12U);
25
26    /*
27     * Test the integrated API
28     */
29    TEST_ASSERT(mbedtls_chacha20_crypt(key_str->x, nonce_str->x, counter, src_str->len, src_str->x,
30                                       output) == 0);
31
32    ASSERT_COMPARE(output, expected_output_str->len,
33                   expected_output_str->x, expected_output_str->len);
34
35    /*
36     * Test the streaming API
37     */
38    mbedtls_chacha20_init(&ctx);
39
40    TEST_ASSERT(mbedtls_chacha20_setkey(&ctx, key_str->x) == 0);
41
42    TEST_ASSERT(mbedtls_chacha20_starts(&ctx, nonce_str->x, counter) == 0);
43
44    memset(output, 0x00, sizeof(output));
45    TEST_ASSERT(mbedtls_chacha20_update(&ctx, src_str->len, src_str->x, output) == 0);
46
47    ASSERT_COMPARE(output, expected_output_str->len,
48                   expected_output_str->x, expected_output_str->len);
49
50    /*
51     * Test the streaming API again, piecewise
52     */
53
54    /* Don't free/init the context nor set the key again,
55     * in order to test that starts() does the right thing. */
56    TEST_ASSERT(mbedtls_chacha20_starts(&ctx, nonce_str->x, counter) == 0);
57
58    memset(output, 0x00, sizeof(output));
59    TEST_ASSERT(mbedtls_chacha20_update(&ctx, 1, src_str->x, output) == 0);
60    TEST_ASSERT(mbedtls_chacha20_update(&ctx, src_str->len - 1,
61                                        src_str->x + 1, output + 1) == 0);
62
63    ASSERT_COMPARE(output, expected_output_str->len,
64                   expected_output_str->x, expected_output_str->len);
65
66    mbedtls_chacha20_free(&ctx);
67}
68/* END_CASE */
69
70/* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
71void chacha20_self_test()
72{
73    TEST_ASSERT(mbedtls_chacha20_self_test(1) == 0);
74}
75/* END_CASE */
76