Add entropy safety switch.
Add a switch that turns entropy collecting off entirely, but enables
mbed TLS to run in an entirely unsafe mode. Enables to test mbed TLS
on platforms that don't have their entropy sources integrated yet.
diff --git a/library/entropy_poll.c b/library/entropy_poll.c
index e2f45c7..79efb87 100644
--- a/library/entropy_poll.c
+++ b/library/entropy_poll.c
@@ -188,6 +188,22 @@
#endif /* _WIN32 && !EFIX64 && !EFI32 */
#endif /* !MBEDTLS_NO_PLATFORM_ENTROPY */
+#if defined(MBEDTLS_TEST_WO_ENTROPY)
+int mbedtls_zero_entropy_poll( void *data,
+ unsigned char *output, size_t len, size_t *olen )
+{
+ ((void) data);
+ *olen = 0;
+
+ if( len < sizeof(unsigned char) )
+ return( 0 );
+
+ *olen = sizeof(unsigned char);
+
+ return( 0 );
+}
+#endif
+
#if defined(MBEDTLS_TIMING_C)
int mbedtls_hardclock_poll( void *data,
unsigned char *output, size_t len, size_t *olen )
