poly1305: 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 CMAC API that is
very comparable to Poly1305, so switch to (pointer, len) for consistency.

include/mbedtls/poly1305.h

@@ -121,8 +121,8 @@ int mbedtls_poly1305_starts( mbedtls_poly1305_context *ctx,
  *                  if ctx or input are NULL.
  */
 int mbedtls_poly1305_update( mbedtls_poly1305_context *ctx,
-                             size_t ilen,
+                             const unsigned char *input,
-                             const unsigned char *input );
+                             size_t ilen );
 
 /**
  * \brief           This function generates the Poly1305 Message
@@ -158,8 +158,8 @@ int mbedtls_poly1305_finish( mbedtls_poly1305_context *ctx,
  *                  if key, input, or mac are NULL.
  */
 int mbedtls_poly1305_mac( const unsigned char key[32],
-                          size_t ilen,
                           const unsigned char *input,
+                          size_t ilen,
                           unsigned char mac[16] );
 
 /**

library/chachapoly.c

@@ -66,8 +66,8 @@ static void mbedtls_chachapoly_pad_aad( mbedtls_chachapoly_context *ctx )
     {
         memset( zeroes, 0, sizeof( zeroes ) );
         (void) mbedtls_poly1305_update( &ctx->poly1305_ctx,
-                                        16U - partial_block_len,
+                                        zeroes,
-                                        zeroes );
+                                        16U - partial_block_len );
     }
 }
 
@@ -85,8 +85,8 @@ static void mbedtls_chachapoly_pad_ciphertext( mbedtls_chachapoly_context *ctx )
     {
         memset( zeroes, 0, sizeof( zeroes ) );
         (void) mbedtls_poly1305_update( &ctx->poly1305_ctx,
-                                        16U - partial_block_len,
+                                        zeroes,
-                                        zeroes );
+                                        16U - partial_block_len );
     }
 }
 
@@ -194,7 +194,7 @@ int mbedtls_chachapoly_update_aad( mbedtls_chachapoly_context *ctx,
 
     ctx->aad_len += aad_len;
 
-    return( mbedtls_poly1305_update( &ctx->poly1305_ctx, aad_len, aad ) );
+    return( mbedtls_poly1305_update( &ctx->poly1305_ctx, aad, aad_len ) );
 }
 
 int mbedtls_chachapoly_update( mbedtls_chachapoly_context *ctx,
@@ -233,11 +233,11 @@ int mbedtls_chachapoly_update( mbedtls_chachapoly_context *ctx,
          *       above, we can safety ignore the return value.
          */
         (void) mbedtls_chacha20_update( &ctx->chacha20_ctx, len, input, output );
-        (void) mbedtls_poly1305_update( &ctx->poly1305_ctx, len, output );
+        (void) mbedtls_poly1305_update( &ctx->poly1305_ctx, output, len );
     }
     else /* DECRYPT */
     {
-        (void) mbedtls_poly1305_update( &ctx->poly1305_ctx, len, input );
+        (void) mbedtls_poly1305_update( &ctx->poly1305_ctx, input, len );
         (void) mbedtls_chacha20_update( &ctx->chacha20_ctx, len, input, output );
     }
 
@@ -289,7 +289,7 @@ int mbedtls_chachapoly_finish( mbedtls_chachapoly_context *ctx,
     len_block[14] = (unsigned char) ( ctx->ciphertext_len >> 48 );
     len_block[15] = (unsigned char) ( ctx->ciphertext_len >> 56 );
 
-    (void) mbedtls_poly1305_update( &ctx->poly1305_ctx, 16U, len_block );
+    (void) mbedtls_poly1305_update( &ctx->poly1305_ctx, len_block, 16U );
     (void) mbedtls_poly1305_finish( &ctx->poly1305_ctx, mac );
 
     return( 0 );

library/poly1305.c

@@ -285,8 +285,8 @@ int mbedtls_poly1305_starts( mbedtls_poly1305_context *ctx,
 }
 
 int mbedtls_poly1305_update( mbedtls_poly1305_context *ctx,
-                             size_t ilen,
+                             const unsigned char *input,
-                             const unsigned char* input )
+                             size_t ilen )
 {
     size_t offset    = 0U;
     size_t remaining = ilen;
@@ -391,8 +391,8 @@ int mbedtls_poly1305_finish( mbedtls_poly1305_context *ctx,
 }
 
 int mbedtls_poly1305_mac( const unsigned char key[32],
-                           size_t ilen,
                           const unsigned char *input,
+                          size_t ilen,
                           unsigned char mac[16] )
 {
     mbedtls_poly1305_context ctx;
@@ -404,7 +404,7 @@ int mbedtls_poly1305_mac( const unsigned char key[32],
     if ( result != 0 )
         goto cleanup;
 
-    result = mbedtls_poly1305_update( &ctx, ilen, input );
+    result = mbedtls_poly1305_update( &ctx, input, ilen );
     if ( result != 0 )
         goto cleanup;
 
@@ -496,8 +496,8 @@ int mbedtls_poly1305_self_test( int verbose )
         }
 
         result = mbedtls_poly1305_mac( test_keys[i],
-                                       test_data_len[i],
                                        test_data[i],
+                                       test_data_len[i],
                                        mac );
         if ( result != 0 )
         {

programs/test/benchmark.c

@@ -538,7 +538,7 @@ int main( int argc, char *argv[] )
 #if defined(MBEDTLS_POLY1305_C)
     if ( todo.poly1305 )
     {
-        TIME_AND_TSC( "Poly1305", mbedtls_poly1305_mac( buf, BUFSIZE, buf, buf ) );
+        TIME_AND_TSC( "Poly1305", mbedtls_poly1305_mac( buf, buf, BUFSIZE, buf ) );
     }
 #endif
 

tests/suites/test_suite_poly1305.function

@@ -20,7 +20,7 @@ void mbedtls_poly1305( char *hex_key_string, char *hex_mac_string, char *hex_src
     src_len = unhexify( src_str, hex_src_string );
     unhexify( key, hex_key_string );
 
-    mbedtls_poly1305_mac( key, src_len, src_str, mac );
+    mbedtls_poly1305_mac( key, src_str, src_len, mac );
     hexify( mac_str, mac, 16 );
 
     TEST_ASSERT( strcmp( (char *) mac_str, hex_mac_string ) == 0 );