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-rw-r--r--src/basic/siphash24.c202
1 files changed, 202 insertions, 0 deletions
diff --git a/src/basic/siphash24.c b/src/basic/siphash24.c
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+++ b/src/basic/siphash24.c
@@ -0,0 +1,202 @@
+/* SPDX-License-Identifier: CC0-1.0 */
+
+/*
+ SipHash reference C implementation
+
+ Written in 2012 by
+ Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com>
+ 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 <https://creativecommons.org/publicdomain/zero/1.0/>.
+
+ (Minimal changes made by Lennart Poettering, to make clean for inclusion in systemd)
+ (Refactored by Tom Gundersen to split up in several functions and follow systemd
+ coding style)
+*/
+
+#include <stdio.h>
+
+#include "macro.h"
+#include "siphash24.h"
+#include "unaligned.h"
+
+static uint64_t rotate_left(uint64_t x, uint8_t b) {
+ assert(b < 64);
+
+ return (x << b) | (x >> (64 - b));
+}
+
+static void sipround(struct siphash *state) {
+ assert(state);
+
+ state->v0 += state->v1;
+ state->v1 = rotate_left(state->v1, 13);
+ state->v1 ^= state->v0;
+ state->v0 = rotate_left(state->v0, 32);
+ state->v2 += state->v3;
+ state->v3 = rotate_left(state->v3, 16);
+ state->v3 ^= state->v2;
+ state->v0 += state->v3;
+ state->v3 = rotate_left(state->v3, 21);
+ state->v3 ^= state->v0;
+ state->v2 += state->v1;
+ state->v1 = rotate_left(state->v1, 17);
+ state->v1 ^= state->v2;
+ state->v2 = rotate_left(state->v2, 32);
+}
+
+void siphash24_init(struct siphash *state, const uint8_t k[static 16]) {
+ uint64_t k0, k1;
+
+ assert(state);
+ assert(k);
+
+ k0 = unaligned_read_le64(k);
+ k1 = unaligned_read_le64(k + 8);
+
+ *state = (struct siphash) {
+ /* "somepseudorandomlygeneratedbytes" */
+ .v0 = 0x736f6d6570736575ULL ^ k0,
+ .v1 = 0x646f72616e646f6dULL ^ k1,
+ .v2 = 0x6c7967656e657261ULL ^ k0,
+ .v3 = 0x7465646279746573ULL ^ k1,
+ .padding = 0,
+ .inlen = 0,
+ };
+}
+
+void siphash24_compress(const void *_in, size_t inlen, struct siphash *state) {
+
+ const uint8_t *in = _in;
+ const uint8_t *end = in + inlen;
+ size_t left = state->inlen & 7;
+ uint64_t m;
+
+ assert(in);
+ assert(state);
+
+ /* Update total length */
+ state->inlen += inlen;
+
+ /* If padding exists, fill it out */
+ if (left > 0) {
+ for ( ; in < end && left < 8; in ++, left ++)
+ state->padding |= ((uint64_t) *in) << (left * 8);
+
+ if (in == end && left < 8)
+ /* We did not have enough input to fill out the padding completely */
+ return;
+
+#if ENABLE_DEBUG_SIPHASH
+ printf("(%3zu) v0 %08x %08x\n", state->inlen, (uint32_t) (state->v0 >> 32), (uint32_t) state->v0);
+ printf("(%3zu) v1 %08x %08x\n", state->inlen, (uint32_t) (state->v1 >> 32), (uint32_t) state->v1);
+ printf("(%3zu) v2 %08x %08x\n", state->inlen, (uint32_t) (state->v2 >> 32), (uint32_t) state->v2);
+ printf("(%3zu) v3 %08x %08x\n", state->inlen, (uint32_t) (state->v3 >> 32), (uint32_t) state->v3);
+ printf("(%3zu) compress padding %08x %08x\n", state->inlen, (uint32_t) (state->padding >> 32), (uint32_t)state->padding);
+#endif
+
+ state->v3 ^= state->padding;
+ sipround(state);
+ sipround(state);
+ state->v0 ^= state->padding;
+
+ state->padding = 0;
+ }
+
+ end -= (state->inlen % sizeof(uint64_t));
+
+ for ( ; in < end; in += 8) {
+ m = unaligned_read_le64(in);
+#if ENABLE_DEBUG_SIPHASH
+ printf("(%3zu) v0 %08x %08x\n", state->inlen, (uint32_t) (state->v0 >> 32), (uint32_t) state->v0);
+ printf("(%3zu) v1 %08x %08x\n", state->inlen, (uint32_t) (state->v1 >> 32), (uint32_t) state->v1);
+ printf("(%3zu) v2 %08x %08x\n", state->inlen, (uint32_t) (state->v2 >> 32), (uint32_t) state->v2);
+ printf("(%3zu) v3 %08x %08x\n", state->inlen, (uint32_t) (state->v3 >> 32), (uint32_t) state->v3);
+ printf("(%3zu) compress %08x %08x\n", state->inlen, (uint32_t) (m >> 32), (uint32_t) m);
+#endif
+ state->v3 ^= m;
+ sipround(state);
+ sipround(state);
+ state->v0 ^= m;
+ }
+
+ left = state->inlen & 7;
+ switch (left) {
+ case 7:
+ state->padding |= ((uint64_t) in[6]) << 48;
+ _fallthrough_;
+ case 6:
+ state->padding |= ((uint64_t) in[5]) << 40;
+ _fallthrough_;
+ case 5:
+ state->padding |= ((uint64_t) in[4]) << 32;
+ _fallthrough_;
+ case 4:
+ state->padding |= ((uint64_t) in[3]) << 24;
+ _fallthrough_;
+ case 3:
+ state->padding |= ((uint64_t) in[2]) << 16;
+ _fallthrough_;
+ case 2:
+ state->padding |= ((uint64_t) in[1]) << 8;
+ _fallthrough_;
+ case 1:
+ state->padding |= ((uint64_t) in[0]);
+ _fallthrough_;
+ case 0:
+ break;
+ }
+}
+
+uint64_t siphash24_finalize(struct siphash *state) {
+ uint64_t b;
+
+ assert(state);
+
+ b = state->padding | (((uint64_t) state->inlen) << 56);
+
+#if ENABLE_DEBUG_SIPHASH
+ printf("(%3zu) v0 %08x %08x\n", state->inlen, (uint32_t) (state->v0 >> 32), (uint32_t) state->v0);
+ printf("(%3zu) v1 %08x %08x\n", state->inlen, (uint32_t) (state->v1 >> 32), (uint32_t) state->v1);
+ printf("(%3zu) v2 %08x %08x\n", state->inlen, (uint32_t) (state->v2 >> 32), (uint32_t) state->v2);
+ printf("(%3zu) v3 %08x %08x\n", state->inlen, (uint32_t) (state->v3 >> 32), (uint32_t) state->v3);
+ printf("(%3zu) padding %08x %08x\n", state->inlen, (uint32_t) (state->padding >> 32), (uint32_t) state->padding);
+#endif
+
+ state->v3 ^= b;
+ sipround(state);
+ sipround(state);
+ state->v0 ^= b;
+
+#if ENABLE_DEBUG_SIPHASH
+ printf("(%3zu) v0 %08x %08x\n", state->inlen, (uint32_t) (state->v0 >> 32), (uint32_t) state->v0);
+ printf("(%3zu) v1 %08x %08x\n", state->inlen, (uint32_t) (state->v1 >> 32), (uint32_t) state->v1);
+ printf("(%3zu) v2 %08x %08x\n", state->inlen, (uint32_t) (state->v2 >> 32), (uint32_t) state->v2);
+ printf("(%3zu) v3 %08x %08x\n", state->inlen, (uint32_t) (state->v3 >> 32), (uint32_t) state->v3);
+#endif
+ state->v2 ^= 0xff;
+
+ sipround(state);
+ sipround(state);
+ sipround(state);
+ sipround(state);
+
+ return state->v0 ^ state->v1 ^ state->v2 ^ state->v3;
+}
+
+uint64_t siphash24(const void *in, size_t inlen, const uint8_t k[static 16]) {
+ struct siphash state;
+
+ assert(in);
+ assert(k);
+
+ siphash24_init(&state, k);
+ siphash24_compress(in, inlen, &state);
+
+ return siphash24_finalize(&state);
+}
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