commit 07f8fa5a69f09bf2bba24a0c93fc3333e4d42a3e
author Manuel Pégourié-Gonnard <mpg@elzevir.fr> Fri Aug 30 18:34:08 2013 +0200
committer Manuel Pégourié-Gonnard <mpg@elzevir.fr> Sat Aug 31 16:08:22 2013 +0200
tree 36bc3b96e6abebd9ab4ec84b8fb080d6eed9fab9
parent b5e85885de37f8368f293db0d343a8fca0410487

GCM in the cipher layer, step 1

- no support for additional data
- no support for tag

library/gcm.c

diff --git a/library/gcm.c b/library/gcm.c
index 3e9969d..9c079bd 100644
--- a/library/gcm.c
+++ b/library/gcm.c
@@ -293,11 +293,11 @@
     uint64_t orig_len = ctx->len * 8;
     uint64_t orig_add_len = ctx->add_len * 8;
 
-    memcpy( tag, ctx->base_ectr, tag_len );
-
     if( tag_len > 16 )
         return( POLARSSL_ERR_GCM_BAD_INPUT );
 
+    memcpy( tag, ctx->base_ectr, tag_len );
+
     if( orig_len || orig_add_len )
     {
         memset( work_buf, 0x00, 16 );