1 #include <stdint.h>
2 #include <stdlib.h>
3 #include "mbedtls/pk.h"
4
LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)5 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
6 {
7 #ifdef MBEDTLS_PK_PARSE_C
8 int ret;
9 mbedtls_pk_context pk;
10
11 mbedtls_pk_init(&pk);
12 #if defined(MBEDTLS_USE_PSA_CRYPTO)
13 psa_status_t status = psa_crypto_init();
14 if (status != PSA_SUCCESS) {
15 goto exit;
16 }
17 #endif /* MBEDTLS_USE_PSA_CRYPTO */
18 ret = mbedtls_pk_parse_public_key(&pk, Data, Size);
19 if (ret == 0) {
20 #if defined(MBEDTLS_RSA_C)
21 if (mbedtls_pk_get_type(&pk) == MBEDTLS_PK_RSA) {
22 mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
23 mbedtls_rsa_context *rsa;
24
25 mbedtls_mpi_init(&N); mbedtls_mpi_init(&P); mbedtls_mpi_init(&Q);
26 mbedtls_mpi_init(&D); mbedtls_mpi_init(&E); mbedtls_mpi_init(&DP);
27 mbedtls_mpi_init(&DQ); mbedtls_mpi_init(&QP);
28
29 rsa = mbedtls_pk_rsa(pk);
30 if (mbedtls_rsa_export(rsa, &N, NULL, NULL, NULL, &E) != 0) {
31 abort();
32 }
33 if (mbedtls_rsa_export(rsa, &N, &P, &Q, &D, &E) != MBEDTLS_ERR_RSA_BAD_INPUT_DATA) {
34 abort();
35 }
36 if (mbedtls_rsa_export_crt(rsa, &DP, &DQ, &QP) != MBEDTLS_ERR_RSA_BAD_INPUT_DATA) {
37 abort();
38 }
39
40 mbedtls_mpi_free(&N); mbedtls_mpi_free(&P); mbedtls_mpi_free(&Q);
41 mbedtls_mpi_free(&D); mbedtls_mpi_free(&E); mbedtls_mpi_free(&DP);
42 mbedtls_mpi_free(&DQ); mbedtls_mpi_free(&QP);
43
44 } else
45 #endif
46 #if defined(MBEDTLS_ECP_C)
47 if (mbedtls_pk_get_type(&pk) == MBEDTLS_PK_ECKEY ||
48 mbedtls_pk_get_type(&pk) == MBEDTLS_PK_ECKEY_DH) {
49 mbedtls_ecp_keypair *ecp = mbedtls_pk_ec(pk);
50 mbedtls_ecp_group_id grp_id = mbedtls_ecp_keypair_get_group_id(ecp);
51 const mbedtls_ecp_curve_info *curve_info =
52 mbedtls_ecp_curve_info_from_grp_id(grp_id);
53
54 /* If the curve is not supported, the key should not have been
55 * accepted. */
56 if (curve_info == NULL) {
57 abort();
58 }
59
60 /* It's a public key, so the private value should not have
61 * been changed from its initialization to 0. */
62 mbedtls_mpi d;
63 mbedtls_mpi_init(&d);
64 if (mbedtls_ecp_export(ecp, NULL, &d, NULL) != 0) {
65 abort();
66 }
67 if (mbedtls_mpi_cmp_int(&d, 0) != 0) {
68 abort();
69 }
70 mbedtls_mpi_free(&d);
71 } else
72 #endif
73 {
74 /* The key is valid but is not of a supported type.
75 * This should not happen. */
76 abort();
77 }
78 }
79 #if defined(MBEDTLS_USE_PSA_CRYPTO)
80 exit:
81 mbedtls_psa_crypto_free();
82 #endif /* MBEDTLS_USE_PSA_CRYPTO */
83 mbedtls_pk_free(&pk);
84 #else
85 (void) Data;
86 (void) Size;
87 #endif //MBEDTLS_PK_PARSE_C
88
89 return 0;
90 }
91