Revert some changes to allow merge
Signed-off-by: Ben Taylor <ben.taylor@linaro.org>
diff --git a/programs/fuzz/fuzz_common.c b/programs/fuzz/fuzz_common.c
new file mode 100644
index 0000000..de16913
--- /dev/null
+++ b/programs/fuzz/fuzz_common.c
@@ -0,0 +1,107 @@
+#define MBEDTLS_DECLARE_PRIVATE_IDENTIFIERS
+
+#include "fuzz_common.h"
+#include <limits.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include "mbedtls/ctr_drbg.h"
+
+#if defined(MBEDTLS_PLATFORM_TIME_ALT)
+mbedtls_time_t dummy_constant_time(mbedtls_time_t *time)
+{
+ (void) time;
+ return 0x5af2a056;
+}
+#endif
+
+void dummy_init(void)
+{
+#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)
+ //mbedtls_ctr_drbg_random requires a valid mbedtls_ctr_drbg_context in p_rng
+ if (p_rng != NULL) {
+ //use mbedtls_ctr_drbg_random to find bugs in it
+ ret = mbedtls_ctr_drbg_random(p_rng, output, output_len);
+ } else {
+ //fall through to pseudo-random
+ ret = 0;
+ }
+#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);
+}