72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
#include "crypto_shorthash_siphash24.h"
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#include "private/common.h"
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#include "shorthash_siphash_ref.h"
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int
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crypto_shorthash_siphashx24(unsigned char *out, const unsigned char *in,
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unsigned long long inlen, const unsigned char *k)
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{
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uint64_t v0 = 0x736f6d6570736575ULL;
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uint64_t v1 = 0x646f72616e646f83ULL;
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uint64_t v2 = 0x6c7967656e657261ULL;
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uint64_t v3 = 0x7465646279746573ULL;
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uint64_t b;
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uint64_t k0 = LOAD64_LE(k);
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uint64_t k1 = LOAD64_LE(k + 8);
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uint64_t m;
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const uint8_t *end = in + inlen - (inlen % sizeof(uint64_t));
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const int left = inlen & 7;
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b = ((uint64_t) inlen) << 56;
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v3 ^= k1;
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v2 ^= k0;
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v1 ^= k1;
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v0 ^= k0;
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for (; in != end; in += 8) {
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m = LOAD64_LE(in);
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v3 ^= m;
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SIPROUND;
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SIPROUND;
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v0 ^= m;
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}
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switch (left) {
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case 7:
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b |= ((uint64_t) in[6]) << 48;
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case 6:
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b |= ((uint64_t) in[5]) << 40;
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case 5:
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b |= ((uint64_t) in[4]) << 32;
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case 4:
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b |= ((uint64_t) in[3]) << 24;
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case 3:
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b |= ((uint64_t) in[2]) << 16;
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case 2:
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b |= ((uint64_t) in[1]) << 8;
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case 1:
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b |= ((uint64_t) in[0]);
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break;
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case 0:
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break;
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}
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v3 ^= b;
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SIPROUND;
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SIPROUND;
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v0 ^= b;
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v2 ^= 0xee;
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SIPROUND;
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SIPROUND;
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SIPROUND;
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SIPROUND;
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b = v0 ^ v1 ^ v2 ^ v3;
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STORE64_LE(out, b);
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v1 ^= 0xdd;
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SIPROUND;
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SIPROUND;
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SIPROUND;
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SIPROUND;
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b = v0 ^ v1 ^ v2 ^ v3;
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STORE64_LE(out + 8, b);
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return 0;
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}
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