#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); }