programs: ssl: Add one RSA PSS signature algorithm

Add one RSA PSS signature algorithm to the
test list of signature algorithms. This allows
certificate chains exposing an RSA key with
signatures using SHA-1 to be used in tests
where an TLS 1.3 handshake is performed.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/programs/ssl/ssl_test_common_source.c b/programs/ssl/ssl_test_common_source.c
index 0e66895..c6a9a70 100644
--- a/programs/ssl/ssl_test_common_source.c
+++ b/programs/ssl/ssl_test_common_source.c
@@ -285,6 +285,9 @@
 #if defined(MBEDTLS_SHA224_C)
     MBEDTLS_SSL_SIG_ALG( MBEDTLS_SSL_HASH_SHA224 )
 #endif
+#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_SHA256_C)
+    MBEDTLS_TLS1_3_SIG_RSA_PSS_RSAE_SHA256,
+#endif /* MBEDTLS_RSASSA_C && MBEDTLS_SHA256_C */
 #if defined(MBEDTLS_SHA1_C)
     /* Allow SHA-1 as we use it extensively in tests. */
     MBEDTLS_SSL_SIG_ALG( MBEDTLS_SSL_HASH_SHA1 )