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/*
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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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Copyright (c) 2016 Maximilian Muenchow <maximilian.muenchow@teamspeak.com>
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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 <linux/kernel.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) (u64)(((x) << (b)) | ((x) >> (64 - (b))))
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#define U8TO64_LE(p) \
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(((u64)((p)[0])) | ((u64)((p)[1]) << 8) | \
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((u64)((p)[2]) << 16) | ((u64)((p)[3]) << 24) | \
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((u64)((p)[4]) << 32) | ((u64)((p)[5]) << 40) | \
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((u64)((p)[6]) << 48) | ((u64)((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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printk("(%d) v0 %x %x\n", (int)inlen, (u32)(v0 >> 32), (u32)v0); \
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printk("(%d) v1 %x %x\n", (int)inlen, (u32)(v1 >> 32), (u32)v1); \
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printk("(%d) v2 %x %x\n", (int)inlen, (u32)(v2 >> 32), (u32)v2); \
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printk("(%d) v3 %x %x\n", (int)inlen, (u32)(v3 >> 32), (u32)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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// it is assumed that every parameter is in LE
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int ts3init_siphash(u64 *out, const u8 *in, u64 inlen, u64 k0, u64 k1) {
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/* "somepseudorandomlygeneratedbytes" */
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u64 v0 = 0x736f6d6570736575ULL;
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u64 v1 = 0x646f72616e646f6dULL;
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u64 v2 = 0x6c7967656e657261ULL;
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u64 v3 = 0x7465646279746573ULL;
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u64 b;
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u64 m;
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int i;
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const u8 *end = in + inlen - (inlen % sizeof(u64));
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const int left = inlen & 7;
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k0 = le64_to_cpu(k0);
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k1 = le64_to_cpu(k1);
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b = ((u64)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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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 |= ((u64)in[6]) << 48;
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case 6:
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b |= ((u64)in[5]) << 40;
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case 5:
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b |= ((u64)in[4]) << 32;
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case 4:
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b |= ((u64)in[3]) << 24;
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case 3:
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b |= ((u64)in[2]) << 16;
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case 2:
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b |= ((u64)in[1]) << 8;
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case 1:
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b |= ((u64)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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v2 ^= 0xff;
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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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*out = cpu_to_le64(b);
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return 0;
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}
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