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Improve macro hygiene

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This commit improves hygiene and formatting of macro definitions
throughout the library. Specifically:
- It adds brackets around parameters to avoid unintended
  interpretation of arguments, e.g. due to operator precedence.
- It adds uses of the `do { ... } while( 0 )` idiom for macros that
  can be used as commands.
This commit is contained in:
Hanno Becker
2018-10-15 12:01:35 +01:00
committed by Simon Butcher
parent 9c99dc862c
commit 1eeca41472
23 changed files with 325 additions and 252 deletions
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16
library/ccm.c
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@@ -134,11 +134,17 @@ void mbedtls_ccm_free( mbedtls_ccm_context *ctx )
* This avoids allocating one more 16 bytes buffer while allowing src == dst.
*/
#define CTR_CRYPT( dst, src, len ) \
if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, ctr, 16, b, &olen ) ) != 0 ) \
return( ret ); \
\
for( i = 0; i < len; i++ ) \
dst[i] = src[i] ^ b[i];
do \
{ \
if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, ctr, \
16, b, &olen ) ) != 0 ) \
{ \
return( ret ); \
} \
\
for( i = 0; i < (len); i++ ) \
(dst)[i] = (src)[i] ^ b[i]; \
} while( 0 )
/*
* Authenticated encryption or decryption