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sha3: code shrink

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function                                             old     new   delta
KeccakF                                             1053    1078     +25
KeccakF_RoundConstants                               192      48    -144

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2013-01-15 16:27:39 +01:00
parent a55df27936
commit ac4100e103
1 changed files with 36 additions and 26 deletions
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62
libbb/hash_md5_sha.c
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@ -933,32 +933,40 @@ enum {
cKeccakNumberOfRounds = 24, cKeccakNumberOfRounds = 24,
}; };
static const uint64_t KeccakF_RoundConstants[cKeccakNumberOfRounds] = { /* Elements should be 64-bit, but top half is always zero or 0x80000000.
0x0000000000000001ULL, * It is encoded as a separate word below.
0x0000000000008082ULL, * Same is true for 31th bits.
0x800000000000808aULL, */
0x8000000080008000ULL, static const uint16_t KeccakF_RoundConstants[cKeccakNumberOfRounds] = {
0x000000000000808bULL, 0x0001UL,
0x0000000080000001ULL, 0x8082UL,
0x8000000080008081ULL, 0x808aUL,
0x8000000000008009ULL, 0x8000UL,
0x000000000000008aULL, 0x808bUL,
0x0000000000000088ULL, 0x0001UL,
0x0000000080008009ULL, 0x8081UL,
0x000000008000000aULL, 0x8009UL,
0x000000008000808bULL, 0x008aUL,
0x800000000000008bULL, 0x0088UL,
0x8000000000008089ULL, 0x8009UL,
0x8000000000008003ULL, 0x000aUL,
0x8000000000008002ULL, 0x808bUL,
0x8000000000000080ULL, 0x008bUL,
0x000000000000800aULL, 0x8089UL,
0x800000008000000aULL, 0x8003UL,
0x8000000080008081ULL, 0x8002UL,
0x8000000000008080ULL, 0x0080UL,
0x0000000080000001ULL, 0x800aUL,
0x8000000080008008ULL 0x000aUL,
0x8081UL,
0x8080UL,
0x0001UL,
0x8008UL
}; };
/* 0th first - 0011 0011 0000 0111 1101 1101: */
#define KeccakF_RoundConstantBit63 ((uint32_t)(0x3307dd00))
/* 0th first - 0001 0110 0011 1000 0001 1011: */
#define KeccakF_RoundConstantBit31 ((uint32_t)(0x16381b00))
static const uint8_t KeccakF_RotationConstants[25] = { static const uint8_t KeccakF_RotationConstants[25] = {
1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 2, 14, 27, 41, 56, 8, 25, 43, 62, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 2, 14, 27, 41, 56, 8, 25, 43, 62,
@ -1075,7 +1083,9 @@ static void KeccakF(uint64_t *state)
} }
/* Iota */ /* Iota */
state[0] ^= KeccakF_RoundConstants[round]; state[0] ^= KeccakF_RoundConstants[round]
| (uint32_t)((KeccakF_RoundConstantBit31 << round) & 0x80000000)
| (uint64_t)((KeccakF_RoundConstantBit63 << round) & 0x80000000) << 32;
} }
if (BB_BIG_ENDIAN) { if (BB_BIG_ENDIAN) {