From faed9ae6b49e2002c499f1f0551b65ed1a1d8bd4 Mon Sep 17 00:00:00 2001 From: Dmitry Eremin-Solenikov Date: Mon, 26 Aug 2019 21:20:21 +0300 Subject: [PATCH] gcm: use uint64_t member of nettle_block16 Remove last usage of unsigned long member of nettle_block16. Signed-off-by: Dmitry Eremin-Solenikov --- gcm.c | 47 ++++++++++++----------------------------------- 1 file changed, 12 insertions(+), 35 deletions(-) diff --git a/gcm.c b/gcm.c index a55f603f..627097b2 100644 --- a/gcm.c +++ b/gcm.c @@ -133,45 +133,22 @@ shift_table[0x10] = { static void gcm_gf_shift_4(union nettle_block16 *x) { - unsigned long *w = x->w; - unsigned long reduce; + uint64_t *u64 = x->u64; + uint64_t reduce; /* Shift uses big-endian representation. */ #if WORDS_BIGENDIAN -# if SIZEOF_LONG == 4 - reduce = shift_table[w[3] & 0xf]; - w[3] = (w[3] >> 4) | ((w[2] & 0xf) << 28); - w[2] = (w[2] >> 4) | ((w[1] & 0xf) << 28); - w[1] = (w[1] >> 4) | ((w[0] & 0xf) << 28); - w[0] = (w[0] >> 4) ^ (reduce << 16); -# elif SIZEOF_LONG == 8 - reduce = shift_table[w[1] & 0xf]; - w[1] = (w[1] >> 4) | ((w[0] & 0xf) << 60); - w[0] = (w[0] >> 4) ^ (reduce << 48); -# else -# error Unsupported word size. */ -#endif + reduce = shift_table[u64[1] & 0xf]; + u64[1] = (u64[1] >> 4) | ((u64[0] & 0xf) << 60); + u64[0] = (u64[0] >> 4) ^ (reduce << 48); #else /* ! WORDS_BIGENDIAN */ -# if SIZEOF_LONG == 4 -#define RSHIFT_WORD(x) \ - ((((x) & 0xf0f0f0f0UL) >> 4) \ - | (((x) & 0x000f0f0f) << 12)) - reduce = shift_table[(w[3] >> 24) & 0xf]; - w[3] = RSHIFT_WORD(w[3]) | ((w[2] >> 20) & 0xf0); - w[2] = RSHIFT_WORD(w[2]) | ((w[1] >> 20) & 0xf0); - w[1] = RSHIFT_WORD(w[1]) | ((w[0] >> 20) & 0xf0); - w[0] = RSHIFT_WORD(w[0]) ^ reduce; -# elif SIZEOF_LONG == 8 -#define RSHIFT_WORD(x) \ - ((((x) & 0xf0f0f0f0f0f0f0f0UL) >> 4) \ - | (((x) & 0x000f0f0f0f0f0f0fUL) << 12)) - reduce = shift_table[(w[1] >> 56) & 0xf]; - w[1] = RSHIFT_WORD(w[1]) | ((w[0] >> 52) & 0xf0); - w[0] = RSHIFT_WORD(w[0]) ^ reduce; -# else -# error Unsupported word size. */ -# endif -# undef RSHIFT_WORD +#define RSHIFT_WORD_4(x) \ + ((((x) & UINT64_C(0xf0f0f0f0f0f0f0f0)) >> 4) \ + | (((x) & UINT64_C(0x000f0f0f0f0f0f0f)) << 12)) + reduce = shift_table[(u64[1] >> 56) & 0xf]; + u64[1] = RSHIFT_WORD_4(u64[1]) | ((u64[0] >> 52) & 0xf0); + u64[0] = RSHIFT_WORD_4(u64[0]) ^ reduce; +# undef RSHIFT_WORD_4 #endif /* ! WORDS_BIGENDIAN */ } -- GitLab