1 /*
2 * Copyright 2023-2024 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 * https://www.openssl.org/source/license.html
8 * or in the file LICENSE in the source distribution.
9 */
10
11 #include <openssl/decoder.h>
12 #include <openssl/err.h>
13 #include <openssl/rand.h>
14 #include "fuzzer.h"
15
16 static ASN1_PCTX *pctx;
17
FuzzerInitialize(int * argc,char *** argv)18 int FuzzerInitialize(int *argc, char ***argv)
19 {
20 FuzzerSetRand();
21
22 OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS
23 | OPENSSL_INIT_ADD_ALL_CIPHERS
24 | OPENSSL_INIT_ADD_ALL_DIGESTS, NULL);
25
26 pctx = ASN1_PCTX_new();
27 ASN1_PCTX_set_flags(pctx, ASN1_PCTX_FLAGS_SHOW_ABSENT
28 | ASN1_PCTX_FLAGS_SHOW_SEQUENCE
29 | ASN1_PCTX_FLAGS_SHOW_SSOF
30 | ASN1_PCTX_FLAGS_SHOW_TYPE
31 | ASN1_PCTX_FLAGS_SHOW_FIELD_STRUCT_NAME);
32 ASN1_PCTX_set_str_flags(pctx, ASN1_STRFLGS_UTF8_CONVERT
33 | ASN1_STRFLGS_SHOW_TYPE
34 | ASN1_STRFLGS_DUMP_ALL);
35
36 ERR_clear_error();
37 CRYPTO_free_ex_index(0, -1);
38 return 1;
39 }
40
FuzzerTestOneInput(const uint8_t * buf,size_t len)41 int FuzzerTestOneInput(const uint8_t *buf, size_t len)
42 {
43 OSSL_DECODER_CTX *dctx;
44 EVP_PKEY *pkey = NULL;
45 EVP_PKEY_CTX *ctx = NULL;
46 BIO *bio;
47
48 bio = BIO_new(BIO_s_null());
49 dctx = OSSL_DECODER_CTX_new_for_pkey(&pkey, NULL, NULL, NULL, 0, NULL,
50 NULL);
51 if (dctx == NULL) {
52 return 0;
53 }
54 if (OSSL_DECODER_from_data(dctx, &buf, &len)) {
55 EVP_PKEY *pkey2;
56
57 EVP_PKEY_print_public(bio, pkey, 1, pctx);
58 EVP_PKEY_print_private(bio, pkey, 1, pctx);
59 EVP_PKEY_print_params(bio, pkey, 1, pctx);
60
61 pkey2 = EVP_PKEY_dup(pkey);
62 OPENSSL_assert(pkey2 != NULL);
63 EVP_PKEY_eq(pkey, pkey2);
64 EVP_PKEY_free(pkey2);
65
66 ctx = EVP_PKEY_CTX_new(pkey, NULL);
67 /*
68 * Param check will take too long time on large DH parameters.
69 * Skip it.
70 */
71 if ((!EVP_PKEY_is_a(pkey, "DH") && !EVP_PKEY_is_a(pkey, "DHX"))
72 || EVP_PKEY_get_bits(pkey) <= 2048)
73 EVP_PKEY_param_check(ctx);
74
75 EVP_PKEY_public_check(ctx);
76 /* Private and pairwise checks are unbounded, skip for large keys. */
77 if (EVP_PKEY_get_bits(pkey) <= 4096) {
78 EVP_PKEY_private_check(ctx);
79 EVP_PKEY_pairwise_check(ctx);
80 }
81 OPENSSL_assert(ctx != NULL);
82 EVP_PKEY_CTX_free(ctx);
83 EVP_PKEY_free(pkey);
84 }
85 OSSL_DECODER_CTX_free(dctx);
86
87 BIO_free(bio);
88 ERR_clear_error();
89 return 0;
90 }
91
FuzzerCleanup(void)92 void FuzzerCleanup(void)
93 {
94 ASN1_PCTX_free(pctx);
95 FuzzerClearRand();
96 }
97
