From 2222d689c547b9eb8063ca019607543809612ee5 Mon Sep 17 00:00:00 2001
From: Steven Cooreman <steven.cooreman@silabs.com>
Date: Mon, 11 Jan 2021 18:45:22 +0100
Subject: [PATCH] Allow GCM selftest to skip non-12-byte IVs for ALT
 implementations

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
---
 library/gcm.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/library/gcm.c b/library/gcm.c
index 2363e584e..f237bab7d 100644
--- a/library/gcm.c
+++ b/library/gcm.c
@@ -819,6 +819,15 @@ int mbedtls_gcm_self_test( int verbose )
                                 add_len_test_data[i],
                                 pt_test_data[pt_index_test_data[i]],
                                 buf, 16, tag_buf );
+#if defined(MBEDTLS_GCM_ALT)
+            /* Allow alternative implementations to only support 12-byte nonces. */
+            if( ret == MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED &&
+                iv_len_test_data[i] != 12 )
+            {
+                mbedtls_printf( "skipped\n" );
+                break;
+            }
+#endif /* defined(MBEDTLS_GCM_ALT) */
             if( ret != 0 )
                 goto exit;