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Diffstat (limited to '')
| -rw-r--r-- | plugins/imfile/siphash.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/plugins/imfile/siphash.c b/plugins/imfile/siphash.c new file mode 100644 index 0000000..8d5fac7 --- /dev/null +++ b/plugins/imfile/siphash.c @@ -0,0 +1,185 @@ +/* SipHash reference C implementation + * + * Copyright (c) 2012-2016 Jean-Philippe Aumasson + * <jeanphilippe.aumasson@gmail.com> + * Copyright (c) 2012-2014 Daniel J. Bernstein <djb@cr.yp.to> + * + * Slightly adapted by rsyslog in regard to build system and code style + * check. + * + * To the extent possible under law, the author(s) have dedicated all copyright + * and related and neighboring rights to this software to the public domain + * worldwide. This software is distributed without any warranty. + * + * You should have received a copy of the CC0 Public Domain Dedication along + * with + * this software. If not, see + * <http://creativecommons.org/publicdomain/zero/1.0/>. + * + * For details on siphash see https://131002.net/siphash/ + */ +#include <assert.h> +#include <stdint.h> +#include <stdio.h> +#include <string.h> + +/* default: SipHash-2-4 */ +#define cROUNDS 2 +#define dROUNDS 4 + +#define ROTL(x, b) (uint64_t)(((x) << (b)) | ((x) >> (64 - (b)))) + +#define U32TO8_LE(p, v) \ + (p)[0] = (uint8_t)((v)); \ + (p)[1] = (uint8_t)((v) >> 8); \ + (p)[2] = (uint8_t)((v) >> 16); \ + (p)[3] = (uint8_t)((v) >> 24); + +#define U64TO8_LE(p, v) \ + U32TO8_LE((p), (uint32_t)((v))); \ + U32TO8_LE((p) + 4, (uint32_t)((v) >> 32)); + +#define U8TO64_LE(p) \ + (((uint64_t)((p)[0])) | ((uint64_t)((p)[1]) << 8) | \ + ((uint64_t)((p)[2]) << 16) | ((uint64_t)((p)[3]) << 24) | \ + ((uint64_t)((p)[4]) << 32) | ((uint64_t)((p)[5]) << 40) | \ + ((uint64_t)((p)[6]) << 48) | ((uint64_t)((p)[7]) << 56)) + +#define SIPROUND \ + do { \ + v0 += v1; \ + v1 = ROTL(v1, 13); \ + v1 ^= v0; \ + v0 = ROTL(v0, 32); \ + v2 += v3; \ + v3 = ROTL(v3, 16); \ + v3 ^= v2; \ + v0 += v3; \ + v3 = ROTL(v3, 21); \ + v3 ^= v0; \ + v2 += v1; \ + v1 = ROTL(v1, 17); \ + v1 ^= v2; \ + v2 = ROTL(v2, 32); \ + } while (0) + +#ifdef DEBUG +#define TRACE \ + do { \ + printf("(%3d) v0 %08x %08x\n", (int)inlen, (uint32_t)(v0 >> 32), \ + (uint32_t)v0); \ + printf("(%3d) v1 %08x %08x\n", (int)inlen, (uint32_t)(v1 >> 32), \ + (uint32_t)v1); \ + printf("(%3d) v2 %08x %08x\n", (int)inlen, (uint32_t)(v2 >> 32), \ + (uint32_t)v2); \ + printf("(%3d) v3 %08x %08x\n", (int)inlen, (uint32_t)(v3 >> 32), \ + (uint32_t)v3); \ + } while (0) +#else +#define TRACE +#endif + +extern int rs_siphash(const uint8_t *in, const size_t inlen, const uint8_t *k, + uint8_t *out, const size_t outlen); /* avoid compiler warning */ +#if defined(__clang__) +#pragma GCC diagnostic ignored "-Wunknown-attributes" +#endif +int +#if defined(__clang__) +__attribute__((no_sanitize("unsigned-integer-overflow"))) +#endif +rs_siphash(const uint8_t *in, const size_t inlen, const uint8_t *k, + uint8_t *out, const size_t outlen) { + + uint64_t v0 = 0x736f6d6570736575ULL; + uint64_t v1 = 0x646f72616e646f6dULL; + uint64_t v2 = 0x6c7967656e657261ULL; + uint64_t v3 = 0x7465646279746573ULL; + uint64_t k0 = U8TO64_LE(k); + uint64_t k1 = U8TO64_LE(k + 8); + uint64_t m; + int i; + const uint8_t *end = in + inlen - (inlen % sizeof(uint64_t)); + const int left = inlen & 7; + uint64_t b = ((uint64_t)inlen) << 56; + assert((outlen == 8) || (outlen == 16)); + v3 ^= k1; + v2 ^= k0; + v1 ^= k1; + v0 ^= k0; + + if (outlen == 16) + v1 ^= 0xee; + + for (; in != end; in += 8) { + m = U8TO64_LE(in); + v3 ^= m; + + TRACE; + for (i = 0; i < cROUNDS; ++i) + SIPROUND; + + v0 ^= m; + } + + switch (left) { + case 7: + b |= ((uint64_t)in[6]) << 48; + /*FALLTHROUGH*/ + case 6: + b |= ((uint64_t)in[5]) << 40; + /*FALLTHROUGH*/ + case 5: + b |= ((uint64_t)in[4]) << 32; + /*FALLTHROUGH*/ + case 4: + b |= ((uint64_t)in[3]) << 24; + /*FALLTHROUGH*/ + case 3: + b |= ((uint64_t)in[2]) << 16; + /*FALLTHROUGH*/ + case 2: + b |= ((uint64_t)in[1]) << 8; + /*FALLTHROUGH*/ + case 1: + b |= ((uint64_t)in[0]); + break; + case 0: + default: + break; + } + + v3 ^= b; + + TRACE; + for (i = 0; i < cROUNDS; ++i) + SIPROUND; + + v0 ^= b; + + if (outlen == 16) + v2 ^= 0xee; + else + v2 ^= 0xff; + + TRACE; + for (i = 0; i < dROUNDS; ++i) + SIPROUND; + + b = v0 ^ v1 ^ v2 ^ v3; + U64TO8_LE(out, b); + + if (outlen == 8) + return 0; + + v1 ^= 0xdd; + + TRACE; + for (i = 0; i < dROUNDS; ++i) + SIPROUND; + + b = v0 ^ v1 ^ v2 ^ v3; + U64TO8_LE(out + 8, b); + + return 0; +} |