commit ece325c8dd0e4fb1847b92530bfaaddc88e8d467
author Hanno Becker <hanno.becker@arm.com> Thu Jun 13 15:39:27 2019 +0100
committer Hanno Becker <hanno.becker@arm.com> Thu Jul 04 10:27:41 2019 +0100
tree 303d73abfe2b2dd9d8776671fff203c0c9525890
parent 1841f84c7983cdb6cd188e0d536e63767c5d939c

Allow compile-time configuration of PRNG in SSL module

Introduces MBEDTLS_SSL_CONF_RNG to allow configuring the
RNG to be used by the SSL module at compile-time.

Impact on code-size:

|  | GCC 8.2.1 | ARMC5 5.06 | ARMC6 6.12 |
| --- | --- | --- | --- |
| `libmbedtls.a` before | 23535 | 24089 | 27103 |
| `libmbedtls.a` after | 23471 | 24077 | 27045 |
| gain in Bytes | 64 | 12 | 58 |

programs/ssl/ssl_client2.c

diff --git a/programs/ssl/ssl_client2.c b/programs/ssl/ssl_client2.c
index 8d7ee0a..a4af97a 100644
--- a/programs/ssl/ssl_client2.c
+++ b/programs/ssl/ssl_client2.c
@@ -1764,7 +1764,12 @@
         }
 #endif
 
+#if !defined(MBEDTLS_SSL_CONF_RNG)
     mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
+#else
+    mbedtls_ssl_conf_rng_ctx( &conf, &ctr_drbg );
+#endif
+
     mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
 
 #if !defined(MBEDTLS_SSL_CONF_READ_TIMEOUT)