From 5ef92d309a759d9d2acdaf613021d7bfc66d6241 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Manuel=20P=C3=A9gouri=C3=A9-Gonnard?=
 <manuel.pegourie-gonnard@arm.com>
Date: Wed, 9 May 2018 09:34:25 +0200
Subject: [PATCH] chachapoly: adjust parameter order

This module used (len, pointer) while (pointer, len) is more common in the
rest of the library, in particular it's what's used in the GCM API that
very comparable to it, so switch to (pointer, len) for consistency.

Note that the crypt_and_tag() and auth_decrypt() functions were already using
the same convention as GCM, so this also increases intra-module consistency.
---
 include/mbedtls/chachapoly.h | 4 ++--
 library/chachapoly.c         | 6 +++---
 library/cipher.c             | 2 +-
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/mbedtls/chachapoly.h b/include/mbedtls/chachapoly.h
index ddcd5497..ce9737c2 100644
--- a/include/mbedtls/chachapoly.h
+++ b/include/mbedtls/chachapoly.h
@@ -183,8 +183,8 @@ int mbedtls_chachapoly_starts( mbedtls_chachapoly_context *ctx,
  *                  finished, or if the AAD has been finished.
  */
 int mbedtls_chachapoly_update_aad( mbedtls_chachapoly_context *ctx,
-                                   size_t aad_len,
-                                   const unsigned char *aad );
+                                   const unsigned char *aad,
+                                   size_t aad_len );
 
 /**
  * \brief           Thus function feeds data to be encrypted or decrypted
diff --git a/library/chachapoly.c b/library/chachapoly.c
index d599c524..9ca21b39 100644
--- a/library/chachapoly.c
+++ b/library/chachapoly.c
@@ -175,8 +175,8 @@ cleanup:
 }
 
 int mbedtls_chachapoly_update_aad( mbedtls_chachapoly_context *ctx,
-                                   size_t aad_len,
-                                   const unsigned char *aad )
+                                   const unsigned char *aad,
+                                   size_t aad_len )
 {
     if ( ctx == NULL )
     {
@@ -311,7 +311,7 @@ int mbedtls_chachapoly_crypt_and_tag( mbedtls_chachapoly_context *ctx,
     if ( result != 0 )
         goto cleanup;
 
-    result = mbedtls_chachapoly_update_aad( ctx, aad_len, aad );
+    result = mbedtls_chachapoly_update_aad( ctx, aad, aad_len );
     if ( result != 0 )
             goto cleanup;
 
diff --git a/library/cipher.c b/library/cipher.c
index 1827770b..2463a614 100644
--- a/library/cipher.c
+++ b/library/cipher.c
@@ -320,7 +320,7 @@ int mbedtls_cipher_update_ad( mbedtls_cipher_context_t *ctx,
             return( result );
 
         return mbedtls_chachapoly_update_aad( (mbedtls_chachapoly_context*) ctx->cipher_ctx,
-                                                          ad_len, ad );
+                                                          ad, ad_len );
     }
 #endif