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added qa/rpc-tests/test_framework/siphash.py
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alex v
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Feb 15, 2020
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#!/usr/bin/env python3 | ||
# Copyright (c) 2016-2018 The Bitcoin Core developers | ||
# Distributed under the MIT software license, see the accompanying | ||
# file COPYING or http://www.opensource.org/licenses/mit-license.php. | ||
"""Specialized SipHash-2-4 implementations. | ||
This implements SipHash-2-4 for 256-bit integers. | ||
""" | ||
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def rotl64(n, b): | ||
return n >> (64 - b) | (n & ((1 << (64 - b)) - 1)) << b | ||
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def siphash_round(v0, v1, v2, v3): | ||
v0 = (v0 + v1) & ((1 << 64) - 1) | ||
v1 = rotl64(v1, 13) | ||
v1 ^= v0 | ||
v0 = rotl64(v0, 32) | ||
v2 = (v2 + v3) & ((1 << 64) - 1) | ||
v3 = rotl64(v3, 16) | ||
v3 ^= v2 | ||
v0 = (v0 + v3) & ((1 << 64) - 1) | ||
v3 = rotl64(v3, 21) | ||
v3 ^= v0 | ||
v2 = (v2 + v1) & ((1 << 64) - 1) | ||
v1 = rotl64(v1, 17) | ||
v1 ^= v2 | ||
v2 = rotl64(v2, 32) | ||
return (v0, v1, v2, v3) | ||
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def siphash256(k0, k1, h): | ||
n0 = h & ((1 << 64) - 1) | ||
n1 = (h >> 64) & ((1 << 64) - 1) | ||
n2 = (h >> 128) & ((1 << 64) - 1) | ||
n3 = (h >> 192) & ((1 << 64) - 1) | ||
v0 = 0x736f6d6570736575 ^ k0 | ||
v1 = 0x646f72616e646f6d ^ k1 | ||
v2 = 0x6c7967656e657261 ^ k0 | ||
v3 = 0x7465646279746573 ^ k1 ^ n0 | ||
v0, v1, v2, v3 = siphash_round(v0, v1, v2, v3) | ||
v0, v1, v2, v3 = siphash_round(v0, v1, v2, v3) | ||
v0 ^= n0 | ||
v3 ^= n1 | ||
v0, v1, v2, v3 = siphash_round(v0, v1, v2, v3) | ||
v0, v1, v2, v3 = siphash_round(v0, v1, v2, v3) | ||
v0 ^= n1 | ||
v3 ^= n2 | ||
v0, v1, v2, v3 = siphash_round(v0, v1, v2, v3) | ||
v0, v1, v2, v3 = siphash_round(v0, v1, v2, v3) | ||
v0 ^= n2 | ||
v3 ^= n3 | ||
v0, v1, v2, v3 = siphash_round(v0, v1, v2, v3) | ||
v0, v1, v2, v3 = siphash_round(v0, v1, v2, v3) | ||
v0 ^= n3 | ||
v3 ^= 0x2000000000000000 | ||
v0, v1, v2, v3 = siphash_round(v0, v1, v2, v3) | ||
v0, v1, v2, v3 = siphash_round(v0, v1, v2, v3) | ||
v0 ^= 0x2000000000000000 | ||
v2 ^= 0xFF | ||
v0, v1, v2, v3 = siphash_round(v0, v1, v2, v3) | ||
v0, v1, v2, v3 = siphash_round(v0, v1, v2, v3) | ||
v0, v1, v2, v3 = siphash_round(v0, v1, v2, v3) | ||
v0, v1, v2, v3 = siphash_round(v0, v1, v2, v3) | ||
return v0 ^ v1 ^ v2 ^ v3 |