blob: de16913728ef36f1dea6b9c182d6b0fde95b64e6 [file] [log] [blame]
Ben Taylor80490a22025-06-04 08:24:01 +01001#define MBEDTLS_DECLARE_PRIVATE_IDENTIFIERS
2
3#include "fuzz_common.h"
4#include <limits.h>
5#include <stdio.h>
6#include <string.h>
7#include <stdlib.h>
8#include "mbedtls/ctr_drbg.h"
9
10#if defined(MBEDTLS_PLATFORM_TIME_ALT)
11mbedtls_time_t dummy_constant_time(mbedtls_time_t *time)
12{
13 (void) time;
14 return 0x5af2a056;
15}
16#endif
17
18void dummy_init(void)
19{
20#if defined(MBEDTLS_PLATFORM_TIME_ALT)
21 mbedtls_platform_set_time(dummy_constant_time);
22#else
23 fprintf(stderr, "Warning: fuzzing without constant time\n");
24#endif
25}
26
27int dummy_send(void *ctx, const unsigned char *buf, size_t len)
28{
29 //silence warning about unused parameter
30 (void) ctx;
31 (void) buf;
32
33 //pretends we wrote everything ok
34 if (len > INT_MAX) {
35 return -1;
36 }
37 return (int) len;
38}
39
40int fuzz_recv(void *ctx, unsigned char *buf, size_t len)
41{
42 //reads from the buffer from fuzzer
43 fuzzBufferOffset_t *biomemfuzz = (fuzzBufferOffset_t *) ctx;
44
45 if (biomemfuzz->Offset == biomemfuzz->Size) {
46 //EOF
47 return 0;
48 }
49 if (len > INT_MAX) {
50 return -1;
51 }
52 if (len + biomemfuzz->Offset > biomemfuzz->Size) {
53 //do not overflow
54 len = biomemfuzz->Size - biomemfuzz->Offset;
55 }
56 memcpy(buf, biomemfuzz->Data + biomemfuzz->Offset, len);
57 biomemfuzz->Offset += len;
58 return (int) len;
59}
60
61int dummy_random(void *p_rng, unsigned char *output, size_t output_len)
62{
63 int ret;
64 size_t i;
65
66#if defined(MBEDTLS_CTR_DRBG_C)
67 //mbedtls_ctr_drbg_random requires a valid mbedtls_ctr_drbg_context in p_rng
68 if (p_rng != NULL) {
69 //use mbedtls_ctr_drbg_random to find bugs in it
70 ret = mbedtls_ctr_drbg_random(p_rng, output, output_len);
71 } else {
72 //fall through to pseudo-random
73 ret = 0;
74 }
75#else
76 (void) p_rng;
77 ret = 0;
78#endif
79 for (i = 0; i < output_len; i++) {
80 //replace result with pseudo random
81 output[i] = (unsigned char) rand();
82 }
83 return ret;
84}
85
86int dummy_entropy(void *data, unsigned char *output, size_t len)
87{
88 size_t i;
89 (void) data;
90
91 //use mbedtls_entropy_func to find bugs in it
92 //test performance impact of entropy
93 //ret = mbedtls_entropy_func(data, output, len);
94 for (i = 0; i < len; i++) {
95 //replace result with pseudo random
96 output[i] = (unsigned char) rand();
97 }
98 return 0;
99}
100
101int fuzz_recv_timeout(void *ctx, unsigned char *buf, size_t len,
102 uint32_t timeout)
103{
104 (void) timeout;
105
106 return fuzz_recv(ctx, buf, len);
107}