2 * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 /* Based on https://131002.net/siphash C reference implementation */
12 SipHash reference C implementation
14 Copyright (c) 2012-2016 Jean-Philippe Aumasson
15 Copyright (c) 2012-2014 Daniel J. Bernstein
17 To the extent possible under law, the author(s) have dedicated all copyright
18 and related and neighboring rights to this software to the public domain
19 worldwide. This software is distributed without any warranty.
21 You should have received a copy of the CC0 Public Domain Dedication along
22 with this software. If not, see
23 <http://creativecommons.org/publicdomain/zero/1.0/>.
28 #include <openssl/crypto.h>
30 #include "internal/siphash.h"
31 #include "siphash_local.h"
33 /* default: SipHash-2-4 */
34 #define SIPHASH_C_ROUNDS 2
35 #define SIPHASH_D_ROUNDS 4
37 #define ROTL(x, b) (uint64_t)(((x) << (b)) | ((x) >> (64 - (b))))
39 #define U32TO8_LE(p, v) \
40 (p)[0] = (uint8_t)((v)); \
41 (p)[1] = (uint8_t)((v) >> 8); \
42 (p)[2] = (uint8_t)((v) >> 16); \
43 (p)[3] = (uint8_t)((v) >> 24);
45 #define U64TO8_LE(p, v) \
46 U32TO8_LE((p), (uint32_t)((v))); \
47 U32TO8_LE((p) + 4, (uint32_t)((v) >> 32));
49 #define U8TO64_LE(p) \
50 (((uint64_t)((p)[0])) | ((uint64_t)((p)[1]) << 8) | \
51 ((uint64_t)((p)[2]) << 16) | ((uint64_t)((p)[3]) << 24) | \
52 ((uint64_t)((p)[4]) << 32) | ((uint64_t)((p)[5]) << 40) | \
53 ((uint64_t)((p)[6]) << 48) | ((uint64_t)((p)[7]) << 56))
73 size_t SipHash_ctx_size(void)
75 return sizeof(SIPHASH);
78 size_t SipHash_hash_size(SIPHASH *ctx)
80 return ctx->hash_size;
83 /* hash_size = crounds = drounds = 0 means SipHash24 with 16-byte output */
84 int SipHash_Init(SIPHASH *ctx, const unsigned char *k, int hash_size, int crounds, int drounds)
86 uint64_t k0 = U8TO64_LE(k);
87 uint64_t k1 = U8TO64_LE(k + 8);
90 hash_size = SIPHASH_MAX_DIGEST_SIZE;
91 else if (hash_size != SIPHASH_MIN_DIGEST_SIZE &&
92 hash_size != SIPHASH_MAX_DIGEST_SIZE)
96 drounds = SIPHASH_D_ROUNDS;
98 crounds = SIPHASH_C_ROUNDS;
100 ctx->crounds = crounds;
101 ctx->drounds = drounds;
102 ctx->hash_size = hash_size;
105 ctx->total_inlen = 0;
107 ctx->v0 = 0x736f6d6570736575ULL ^ k0;
108 ctx->v1 = 0x646f72616e646f6dULL ^ k1;
109 ctx->v2 = 0x6c7967656e657261ULL ^ k0;
110 ctx->v3 = 0x7465646279746573ULL ^ k1;
112 if (ctx->hash_size == SIPHASH_MAX_DIGEST_SIZE)
118 void SipHash_Update(SIPHASH *ctx, const unsigned char *in, size_t inlen)
124 uint64_t v0 = ctx->v0;
125 uint64_t v1 = ctx->v1;
126 uint64_t v2 = ctx->v2;
127 uint64_t v3 = ctx->v3;
129 ctx->total_inlen += inlen;
132 /* deal with leavings */
133 size_t available = SIPHASH_BLOCK_SIZE - ctx->len;
135 /* not enough to fill leavings */
136 if (inlen < available) {
137 memcpy(&ctx->leavings[ctx->len], in, inlen);
142 /* copy data into leavings and reduce input */
143 memcpy(&ctx->leavings[ctx->len], in, available);
147 /* process leavings */
148 m = U8TO64_LE(ctx->leavings);
150 for (i = 0; i < ctx->crounds; ++i)
154 left = inlen & (SIPHASH_BLOCK_SIZE-1); /* gets put into leavings */
155 end = in + inlen - left;
157 for (; in != end; in += 8) {
160 for (i = 0; i < ctx->crounds; ++i)
165 /* save leavings and other ctx */
167 memcpy(ctx->leavings, end, left);
176 int SipHash_Final(SIPHASH *ctx, unsigned char *out, size_t outlen)
180 uint64_t b = ctx->total_inlen << 56;
181 uint64_t v0 = ctx->v0;
182 uint64_t v1 = ctx->v1;
183 uint64_t v2 = ctx->v2;
184 uint64_t v3 = ctx->v3;
186 if (outlen != (size_t)ctx->hash_size)
191 b |= ((uint64_t)ctx->leavings[6]) << 48;
194 b |= ((uint64_t)ctx->leavings[5]) << 40;
197 b |= ((uint64_t)ctx->leavings[4]) << 32;
200 b |= ((uint64_t)ctx->leavings[3]) << 24;
203 b |= ((uint64_t)ctx->leavings[2]) << 16;
206 b |= ((uint64_t)ctx->leavings[1]) << 8;
209 b |= ((uint64_t)ctx->leavings[0]);
215 for (i = 0; i < ctx->crounds; ++i)
218 if (ctx->hash_size == SIPHASH_MAX_DIGEST_SIZE)
222 for (i = 0; i < ctx->drounds; ++i)
224 b = v0 ^ v1 ^ v2 ^ v3;
226 if (ctx->hash_size == SIPHASH_MIN_DIGEST_SIZE)
229 for (i = 0; i < ctx->drounds; ++i)
231 b = v0 ^ v1 ^ v2 ^ v3;
232 U64TO8_LE(out + 8, b);