diff options
Diffstat (limited to 'crypto/siphash/siphash.c')
| -rw-r--r-- | crypto/siphash/siphash.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/crypto/siphash/siphash.c b/crypto/siphash/siphash.c new file mode 100644 index 0000000000..4bf2382972 --- /dev/null +++ b/crypto/siphash/siphash.c @@ -0,0 +1,230 @@ +/* + * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +/* Based on https://131002.net/siphash C reference implementation */ +/* + 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> + + 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/>. + */ + +#include <stdlib.h> +#include <string.h> +#include <openssl/crypto.h> + +#include "internal/siphash.h" +#include "siphash_local.h" + +/* default: SipHash-2-4 */ +#define SIPHASH_C_ROUNDS 2 +#define SIPHASH_D_ROUNDS 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) + +size_t SipHash_ctx_size(void) +{ + return sizeof(SIPHASH); +} + +size_t SipHash_hash_size(SIPHASH *ctx) +{ + return ctx->hash_size; +} + +/* hash_size = crounds = drounds = 0 means SipHash24 with 16-byte output */ +int SipHash_Init(SIPHASH *ctx, const unsigned char *k, int hash_size, int crounds, int drounds) +{ + uint64_t k0 = U8TO64_LE(k); + uint64_t k1 = U8TO64_LE(k + 8); + + if (hash_size == 0) + hash_size = SIPHASH_MAX_DIGEST_SIZE; + else if (hash_size != SIPHASH_MIN_DIGEST_SIZE && + hash_size != SIPHASH_MAX_DIGEST_SIZE) + return 0; + + if (drounds == 0) + drounds = SIPHASH_D_ROUNDS; + if (crounds == 0) + crounds = SIPHASH_C_ROUNDS; + + ctx->crounds = crounds; + ctx->drounds = drounds; + ctx->hash_size = hash_size; + + ctx->len = 0; + ctx->total_inlen = 0; + + ctx->v0 = 0x736f6d6570736575ULL ^ k0; + ctx->v1 = 0x646f72616e646f6dULL ^ k1; + ctx->v2 = 0x6c7967656e657261ULL ^ k0; + ctx->v3 = 0x7465646279746573ULL ^ k1; + + if (ctx->hash_size == SIPHASH_MAX_DIGEST_SIZE) + ctx->v1 ^= 0xee; + + return 1; +} + +void SipHash_Update(SIPHASH *ctx, const unsigned char *in, size_t inlen) +{ + uint64_t m; + const uint8_t *end; + int left; + int i; + uint64_t v0 = ctx->v0; + uint64_t v1 = ctx->v1; + uint64_t v2 = ctx->v2; + uint64_t v3 = ctx->v3; + + ctx->total_inlen += inlen; + + if (ctx->len) { + /* deal with leavings */ + size_t available = SIPHASH_BLOCK_SIZE - ctx->len; + + /* not enough to fill leavings */ + if (inlen < available) { + memcpy(&ctx->leavings[ctx->len], in, inlen); + ctx->len += inlen; + return; + } + + /* copy data into leavings and reduce input */ + memcpy(&ctx->leavings[ctx->len], in, available); + inlen -= available; + in += available; + + /* process leavings */ + m = U8TO64_LE(ctx->leavings); + v3 ^= m; + for (i = 0; i < ctx->crounds; ++i) + SIPROUND; + v0 ^= m; + } + left = inlen & (SIPHASH_BLOCK_SIZE-1); /* gets put into leavings */ + end = in + inlen - left; + + for (; in != end; in += 8) { + m = U8TO64_LE(in); + v3 ^= m; + for (i = 0; i < ctx->crounds; ++i) + SIPROUND; + v0 ^= m; + } + + /* save leavings and other ctx */ + if (left) + memcpy(ctx->leavings, end, left); + ctx->len = left; + + ctx->v0 = v0; + ctx->v1 = v1; + ctx->v2 = v2; + ctx->v3 = v3; +} + +int SipHash_Final(SIPHASH *ctx, unsigned char *out, size_t outlen) +{ + /* finalize hash */ + int i; + uint64_t b = ctx->total_inlen << 56; + uint64_t v0 = ctx->v0; + uint64_t v1 = ctx->v1; + uint64_t v2 = ctx->v2; + uint64_t v3 = ctx->v3; + + if (outlen != (size_t)ctx->hash_size) + return 0; + + switch (ctx->len) { + case 7: + b |= ((uint64_t)ctx->leavings[6]) << 48; + case 6: + b |= ((uint64_t)ctx->leavings[5]) << 40; + case 5: + b |= ((uint64_t)ctx->leavings[4]) << 32; + case 4: + b |= ((uint64_t)ctx->leavings[3]) << 24; + case 3: + b |= ((uint64_t)ctx->leavings[2]) << 16; + case 2: + b |= ((uint64_t)ctx->leavings[1]) << 8; + case 1: + b |= ((uint64_t)ctx->leavings[0]); + case 0: + break; + } + + v3 ^= b; + for (i = 0; i < ctx->crounds; ++i) + SIPROUND; + v0 ^= b; + if (ctx->hash_size == SIPHASH_MAX_DIGEST_SIZE) + v2 ^= 0xee; + else + v2 ^= 0xff; + for (i = 0; i < ctx->drounds; ++i) + SIPROUND; + b = v0 ^ v1 ^ v2 ^ v3; + U64TO8_LE(out, b); + if (ctx->hash_size == SIPHASH_MIN_DIGEST_SIZE) + return 1; + v1 ^= 0xdd; + for (i = 0; i < ctx->drounds; ++i) + SIPROUND; + b = v0 ^ v1 ^ v2 ^ v3; + U64TO8_LE(out + 8, b); + return 1; +} |