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| author | Niels Möller <nisse@lysator.liu.se> | 2014-10-23 15:26:38 +0200 |
|---|---|---|
| committer | Niels Möller <nisse@lysator.liu.se> | 2014-10-23 15:26:38 +0200 |
| commit | 77f8c34cbf8f8ad826fce3f412b67f05f78c68d5 (patch) | |
| tree | c8867c078500a08459652880d295bb32e2f4a669 /memxor-internal.h | |
| parent | 57122465ccc89996f9f8f71e7607ee67a2860e1c (diff) | |
| download | nettle-77f8c34cbf8f8ad826fce3f412b67f05f78c68d5.tar.gz | |
Simplify unaligned memxor using READ_PARTIAL macro.
Diffstat (limited to 'memxor-internal.h')
| -rw-r--r-- | memxor-internal.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/memxor-internal.h b/memxor-internal.h index e868c181..dbb5e990 100644 --- a/memxor-internal.h +++ b/memxor-internal.h @@ -52,4 +52,22 @@ typedef unsigned long int word_t; (((w0) << (sh_1)) | ((w1) >> (sh_2))) #endif +#ifndef WORDS_BIGENDIAN +#define READ_PARTIAL(r,p,n) do { \ + word_t _rp_x; \ + unsigned _rp_i; \ + for (_rp_i = (n), _rp_x = (p)[--_rp_i]; _rp_i > 0;) \ + _rp_x = (_rp_x << CHAR_BIT) | (p)[--_rp_i]; \ + (r) = _rp_x; \ + } while (0) +#else +#define READ_PARTIAL(r,p,n) do { \ + word_t _rp_x; \ + unsigned _rp_i; \ + for (_rp_x = (p)[0], _rp_i = 1; _rp_i < (n); _rp_i++) \ + _rp_x = (_rp_x << CHAR_BIT) | (p)[_rp_i]; \ + (r) = _rp_x; \ + } while (0) +#endif + #endif /* NETTLE_MEMXOR_INTERNAL_H_INCLUDED */ |