Ensure context is passed in to dummy_rand
In fuzz_privkey, we switched over to using dummy_rand(), which uses
ctr_drbg internally, and thus requires an initialised ctr_drbg_context
to be passed in via p_rng when calling mbedtls_pk_parse_key().
#include <stdint.h>
#include <stdlib.h>
+#include <string.h>
#include "mbedtls/pk.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
#include "common.h"
//4 Kb should be enough for every bug ;-)
#define MAX_LEN 0x1000
+#if defined(MBEDTLS_PK_PARSE_C) && defined(MBEDTLS_CTR_DRBG_C)
+const char *pers = "fuzz_privkey";
+#endif // MBEDTLS_PK_PARSE_C && MBEDTLS_CTR_DRBG_C
int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
-#ifdef MBEDTLS_PK_PARSE_C
+#if defined(MBEDTLS_PK_PARSE_C) && defined(MBEDTLS_CTR_DRBG_C)
int ret;
mbedtls_pk_context pk;
+ mbedtls_ctr_drbg_context ctr_drbg;
+ mbedtls_entropy_context entropy;
if (Size > MAX_LEN) {
//only work on small inputs
Size = MAX_LEN;
}
+ mbedtls_ctr_drbg_init( &ctr_drbg );
+ mbedtls_entropy_init( &entropy );
+
+ if( mbedtls_ctr_drbg_seed( &ctr_drbg, dummy_entropy, &entropy,
+ ( const unsigned char * ) pers, strlen( pers ) ) != 0 )
+ return 1;
+
mbedtls_pk_init( &pk );
ret = mbedtls_pk_parse_key( &pk, Data, Size, NULL, 0,
- dummy_random, NULL );
+ dummy_random, &ctr_drbg );
if (ret == 0) {
#if defined(MBEDTLS_RSA_C)
if( mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_RSA )
@@ -73,7 +88,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
#else
(void) Data;
(void) Size;
-#endif //MBEDTLS_PK_PARSE_C
+#endif // MBEDTLS_PK_PARSE_C && MBEDTLS_CTR_DRBG_C
return 0;
}
