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165 lines
5.3 KiB
165 lines
5.3 KiB
/* |
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SipHash reference C implementation |
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Copyright (c) 2012-2014 Jean-Philippe Aumasson |
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<jeanphilippe.aumasson@gmail.com> |
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Copyright (c) 2012-2014 Daniel J. Bernstein <djb@cr.yp.to> |
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To the extent possible under law, the author(s) have dedicated all copyright |
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and related and neighboring rights to this software to the public domain |
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worldwide. This software is distributed without any warranty. |
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You should have received a copy of the CC0 Public Domain Dedication along |
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with |
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this software. If not, see |
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<http://creativecommons.org/publicdomain/zero/1.0/>. |
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*/ |
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#include <stdint.h> |
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#include <stdio.h> |
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#include <string.h> |
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/* default: SipHash-2-4 */ |
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#define cROUNDS 2 |
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#define dROUNDS 4 |
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#define ROTL(x, b) (uint64_t)(((x) << (b)) | ((x) >> (64 - (b)))) |
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#define U32TO8_LE(p, v) \ |
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(p)[0] = (uint8_t)((v)); \ |
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(p)[1] = (uint8_t)((v) >> 8); \ |
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(p)[2] = (uint8_t)((v) >> 16); \ |
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(p)[3] = (uint8_t)((v) >> 24); |
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#define U64TO8_LE(p, v) \ |
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U32TO8_LE((p), (uint32_t)((v))); \ |
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U32TO8_LE((p) + 4, (uint32_t)((v) >> 32)); |
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#define U8TO64_LE(p) \ |
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(((uint64_t)((p)[0])) | ((uint64_t)((p)[1]) << 8) | \ |
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((uint64_t)((p)[2]) << 16) | ((uint64_t)((p)[3]) << 24) | \ |
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((uint64_t)((p)[4]) << 32) | ((uint64_t)((p)[5]) << 40) | \ |
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((uint64_t)((p)[6]) << 48) | ((uint64_t)((p)[7]) << 56)) |
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#define SIPROUND \ |
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do { \ |
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v0 += v1; \ |
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v1 = ROTL(v1, 13); \ |
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v1 ^= v0; \ |
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v0 = ROTL(v0, 32); \ |
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v2 += v3; \ |
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v3 = ROTL(v3, 16); \ |
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v3 ^= v2; \ |
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v0 += v3; \ |
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v3 = ROTL(v3, 21); \ |
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v3 ^= v0; \ |
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v2 += v1; \ |
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v1 = ROTL(v1, 17); \ |
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v1 ^= v2; \ |
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v2 = ROTL(v2, 32); \ |
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} while (0) |
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#ifdef DEBUG |
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#define TRACE \ |
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do { \ |
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printf("(%3d) v0 %08x %08x\n", (int)inlen, (uint32_t)(v0 >> 32), \ |
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(uint32_t)v0); \ |
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printf("(%3d) v1 %08x %08x\n", (int)inlen, (uint32_t)(v1 >> 32), \ |
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(uint32_t)v1); \ |
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printf("(%3d) v2 %08x %08x\n", (int)inlen, (uint32_t)(v2 >> 32), \ |
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(uint32_t)v2); \ |
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printf("(%3d) v3 %08x %08x\n", (int)inlen, (uint32_t)(v3 >> 32), \ |
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(uint32_t)v3); \ |
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} while (0) |
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#else |
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#define TRACE |
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#endif |
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int siphash(uint8_t *out, const uint8_t *in, uint64_t inlen, const uint8_t *k) { |
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/* "somepseudorandomlygeneratedbytes" */ |
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uint64_t v0 = 0x736f6d6570736575ULL; |
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uint64_t v1 = 0x646f72616e646f6dULL; |
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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 = U8TO64_LE(k); |
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uint64_t k1 = U8TO64_LE(k + 8); |
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uint64_t m; |
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int i; |
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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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#ifdef DOUBLE |
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v1 ^= 0xee; |
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#endif |
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for (; in != end; in += 8) { |
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m = U8TO64_LE(in); |
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v3 ^= m; |
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TRACE; |
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for (i = 0; i < cROUNDS; ++i) |
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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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TRACE; |
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for (i = 0; i < cROUNDS; ++i) |
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SIPROUND; |
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v0 ^= b; |
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#ifndef DOUBLE |
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v2 ^= 0xff; |
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#else |
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v2 ^= 0xee; |
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#endif |
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TRACE; |
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for (i = 0; i < dROUNDS; ++i) |
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SIPROUND; |
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b = v0 ^ v1 ^ v2 ^ v3; |
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U64TO8_LE(out, b); |
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#ifdef DOUBLE |
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v1 ^= 0xdd; |
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TRACE; |
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for (i = 0; i < dROUNDS; ++i) |
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SIPROUND; |
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b = v0 ^ v1 ^ v2 ^ v3; |
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U64TO8_LE(out + 8, b); |
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#endif |
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return 0; |
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} |
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