Factoring code
diff --git a/tests/fuzz/common.c b/tests/fuzz/common.c
index 450f74b..a9d3d3b 100644
--- a/tests/fuzz/common.c
+++ b/tests/fuzz/common.c
@@ -1,14 +1,85 @@
#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 ) {
+mbedtls_time_t dummy_constant_time( mbedtls_time_t* time )
+{
(void) time;
return 0x5af2a056;
}
-void dummy_init() {
+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
+ return( 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 + biomemfuzz->Offset > biomemfuzz->Size) {
+ //do not overflow
+ len = biomemfuzz->Size - biomemfuzz->Offset;
+ }
+ memcpy(buf, biomemfuzz->Data + biomemfuzz->Offset, len);
+ biomemfuzz->Offset += len;
+ return( len );
+}
+
+int dummy_random( void *p_rng, unsigned char *output, size_t output_len )
+{
+ int ret;
+ size_t i;
+
+ //use mbedtls_ctr_drbg_random to find bugs in it
+ ret = mbedtls_ctr_drbg_random(p_rng, output, output_len);
+ 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);
+}