a89040c7f5
While at it, fix a few other obvious ones such as ENTROPY and TIMING_C when applicable. A non-regression test for CTR_DRBG will be added in a follow-up commit. Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
#include "common.h"
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include "mbedtls/ctr_drbg.h"
|
|
|
|
mbedtls_time_t dummy_constant_time( mbedtls_time_t* time )
|
|
{
|
|
(void) time;
|
|
return 0x5af2a056;
|
|
}
|
|
|
|
void dummy_init()
|
|
{
|
|
#if defined(MBEDTLS_PLATFORM_TIME_ALT)
|
|
mbedtls_platform_set_time( dummy_constant_time );
|
|
#else
|
|
fprintf(stderr, "Warning: fuzzing without constant time\n");
|
|
#endif
|
|
}
|
|
|
|
int dummy_send( void *ctx, const unsigned char *buf, size_t len )
|
|
{
|
|
//silence warning about unused parameter
|
|
(void) ctx;
|
|
(void) buf;
|
|
|
|
//pretends we wrote everything ok
|
|
if( len > INT_MAX ) {
|
|
return( -1 );
|
|
}
|
|
return( (int) len );
|
|
}
|
|
|
|
int fuzz_recv( void *ctx, unsigned char *buf, size_t len )
|
|
{
|
|
//reads from the buffer from fuzzer
|
|
fuzzBufferOffset_t * biomemfuzz = (fuzzBufferOffset_t *) ctx;
|
|
|
|
if(biomemfuzz->Offset == biomemfuzz->Size) {
|
|
//EOF
|
|
return( 0 );
|
|
}
|
|
if( len > INT_MAX ) {
|
|
return( -1 );
|
|
}
|
|
if( len + biomemfuzz->Offset > biomemfuzz->Size ) {
|
|
//do not overflow
|
|
len = biomemfuzz->Size - biomemfuzz->Offset;
|
|
}
|
|
memcpy(buf, biomemfuzz->Data + biomemfuzz->Offset, len);
|
|
biomemfuzz->Offset += len;
|
|
return( (int) len );
|
|
}
|
|
|
|
int dummy_random( void *p_rng, unsigned char *output, size_t output_len )
|
|
{
|
|
int ret;
|
|
size_t i;
|
|
|
|
#if defined(MBEDTLS_CTR_DRBG_C)
|
|
//use mbedtls_ctr_drbg_random to find bugs in it
|
|
ret = mbedtls_ctr_drbg_random(p_rng, output, output_len);
|
|
#else
|
|
(void) p_rng;
|
|
ret = 0;
|
|
#endif
|
|
for (i=0; i<output_len; i++) {
|
|
//replace result with pseudo random
|
|
output[i] = (unsigned char) rand();
|
|
}
|
|
return( ret );
|
|
}
|
|
|
|
int dummy_entropy( void *data, unsigned char *output, size_t len )
|
|
{
|
|
size_t i;
|
|
(void) data;
|
|
|
|
//use mbedtls_entropy_func to find bugs in it
|
|
//test performance impact of entropy
|
|
//ret = mbedtls_entropy_func(data, output, len);
|
|
for (i=0; i<len; i++) {
|
|
//replace result with pseudo random
|
|
output[i] = (unsigned char) rand();
|
|
}
|
|
return( 0 );
|
|
}
|
|
|
|
int fuzz_recv_timeout( void *ctx, unsigned char *buf, size_t len,
|
|
uint32_t timeout )
|
|
{
|
|
(void) timeout;
|
|
|
|
return fuzz_recv(ctx, buf, len);
|
|
}
|