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