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| author | Denys Vlasenko | 2014-07-30 16:26:09 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2014-07-30 16:26:09 +0200 |
| commit | 09a0e2223f68a266749043bf33c84faeb5cee8a0 (patch) | |
| tree | e55c9b8c8c8f0ede551284e28fe0ffe4a8812f2e | |
| parent | 4ff933c0e7895bd1ac1fe9793117f4d69de35514 (diff) | |
| download | busybox-09a0e2223f68a266749043bf33c84faeb5cee8a0.zip busybox-09a0e2223f68a266749043bf33c84faeb5cee8a0.tar.gz | |
sha3: tweak comments and indentation
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | libbb/hash_md5_sha.c | 27 |
1 files changed, 14 insertions, 13 deletions
diff --git a/libbb/hash_md5_sha.c b/libbb/hash_md5_sha.c index 4cef2ab..1f63ccd 100644 --- a/libbb/hash_md5_sha.c +++ b/libbb/hash_md5_sha.c @@ -1174,12 +1174,13 @@ static void sha3_process_block72(uint64_t *state) combine_halves(state); #else - /* Elements should be 64-bit, but top half is always zero or 0x80000000. - * We encode 63rd bits in a separate word below. - * Same is true for 31th bits, which lets us use 16-bit table instead of 64-bit. - * The speed penalty is lost in the noise. - */ + /* Native 64-bit algorithm */ static const uint16_t IOTA_CONST[NROUNDS] = { + /* Elements should be 64-bit, but top half is always zero + * or 0x80000000. We encode 63rd bits in a separate word below. + * Same is true for 31th bits, which lets us use 16-bit table + * instead of 64-bit. The speed penalty is lost in the noise. + */ 0x0001, 0x8082, 0x808a, @@ -1283,7 +1284,7 @@ static void sha3_process_block72(uint64_t *state) #undef RhoPi_twice } /* Chi */ -#if LONG_MAX > 0x7fffffff +# if LONG_MAX > 0x7fffffff for (x = 0; x <= 20; x += 5) { uint64_t BC0, BC1, BC2, BC3, BC4; BC0 = state[x + 0]; @@ -1297,7 +1298,7 @@ static void sha3_process_block72(uint64_t *state) state[x + 3] = BC3 ^ ((~BC4) & BC0); state[x + 4] = BC4 ^ ((~BC0) & BC1); } -#else +# else /* Reduced register pressure version * for register-starved 32-bit arches * (i386: -95 bytes, and it is _faster_) @@ -1305,9 +1306,9 @@ static void sha3_process_block72(uint64_t *state) for (x = 0; x <= 40;) { uint32_t BC0, BC1, BC2, BC3, BC4; uint32_t *const s32 = (uint32_t*)state; -# if SHA3_SMALL +# if SHA3_SMALL do_half: -#endif +# endif BC0 = s32[x + 0*2]; BC1 = s32[x + 1*2]; BC2 = s32[x + 2*2]; @@ -1319,11 +1320,11 @@ static void sha3_process_block72(uint64_t *state) s32[x + 3*2] = BC3 ^ ((~BC4) & BC0); s32[x + 4*2] = BC4 ^ ((~BC0) & BC1); x++; -# if SHA3_SMALL +# if SHA3_SMALL if (x & 1) goto do_half; x += 8; -# else +# else BC0 = s32[x + 0*2]; BC1 = s32[x + 1*2]; BC2 = s32[x + 2*2]; @@ -1335,9 +1336,9 @@ static void sha3_process_block72(uint64_t *state) s32[x + 3*2] = BC3 ^ ((~BC4) & BC0); s32[x + 4*2] = BC4 ^ ((~BC0) & BC1); x += 9; -# endif +# endif } -#endif +# endif /* long is 32-bit */ /* Iota */ state[0] ^= IOTA_CONST[round] | (uint32_t)((IOTA_CONST_bit31 << round) & 0x80000000) |