From 2fe5db87d5702a4f34f6fd28acaa0f5961584e93 Mon Sep 17 00:00:00 2001
From: Paul Elliott <paul.elliott@arm.com>
Date: Thu, 22 Jul 2021 18:10:43 +0100
Subject: [PATCH] Fix passing wrong tag size to GCM finish

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
---
 library/psa_crypto_aead.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/psa_crypto_aead.c b/library/psa_crypto_aead.c
index 5310702c6..6af25ec78 100644
--- a/library/psa_crypto_aead.c
+++ b/library/psa_crypto_aead.c
@@ -628,7 +628,7 @@ psa_status_t mbedtls_psa_aead_finish(
         status =  mbedtls_to_psa_error(
             mbedtls_gcm_finish( &operation->ctx.gcm,
                                 ciphertext, ciphertext_size,
-                                tag, tag_size ) );
+                                tag, operation->tag_length ) );
     else
 #endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
 #if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)