Mirror of BoringSSL (grpc依赖)
https://boringssl.googlesource.com/boringssl
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82 lines
2.3 KiB
82 lines
2.3 KiB
/* Copyright (c) 2019, Google Inc. |
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* |
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* Permission to use, copy, modify, and/or distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ |
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#include <stdint.h> |
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#include <string.h> |
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#include <openssl/siphash.h> |
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#include "../internal.h" |
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static void siphash_round(uint64_t v[4]) { |
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v[0] += v[1]; |
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v[2] += v[3]; |
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v[1] = (v[1] << 13) | (v[1] >> (64 - 13)); |
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v[3] = (v[3] << 16) | (v[3] >> (64 - 16)); |
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v[1] ^= v[0]; |
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v[3] ^= v[2]; |
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v[0] = (v[0] << 32) | (v[0] >> 32); |
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v[2] += v[1]; |
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v[0] += v[3]; |
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v[1] = (v[1] << 17) | (v[1] >> (64 - 17)); |
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v[3] = (v[3] << 21) | (v[3] >> (64 - 21)); |
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v[1] ^= v[2]; |
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v[3] ^= v[0]; |
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v[2] = (v[2] << 32) | (v[2] >> 32); |
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} |
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uint64_t SIPHASH_24(const uint64_t key[2], const uint8_t *input, |
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size_t input_len) { |
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const size_t orig_input_len = input_len; |
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uint64_t v[4]; |
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v[0] = key[0] ^ UINT64_C(0x736f6d6570736575); |
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v[1] = key[1] ^ UINT64_C(0x646f72616e646f6d); |
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v[2] = key[0] ^ UINT64_C(0x6c7967656e657261); |
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v[3] = key[1] ^ UINT64_C(0x7465646279746573); |
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while (input_len >= sizeof(uint64_t)) { |
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uint64_t m; |
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memcpy(&m, input, sizeof(m)); |
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v[3] ^= m; |
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siphash_round(v); |
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siphash_round(v); |
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v[0] ^= m; |
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input += sizeof(uint64_t); |
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input_len -= sizeof(uint64_t); |
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} |
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union { |
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uint8_t bytes[8]; |
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uint64_t word; |
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} last_block; |
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last_block.word = 0; |
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OPENSSL_memcpy(last_block.bytes, input, input_len); |
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last_block.bytes[7] = orig_input_len & 0xff; |
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v[3] ^= last_block.word; |
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siphash_round(v); |
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siphash_round(v); |
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v[0] ^= last_block.word; |
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v[2] ^= 0xff; |
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siphash_round(v); |
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siphash_round(v); |
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siphash_round(v); |
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siphash_round(v); |
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return v[0] ^ v[1] ^ v[2] ^ v[3]; |
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}
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