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author | Pieter Wuille <pieter.wuille@gmail.com> | 2016-06-27 16:06:17 +0200 |
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committer | Suhas Daftuar <sdaftuar@gmail.com> | 2016-07-29 09:41:58 -0400 |
commit | 9c8593d2b4e25ef628172ceadbedf0ef078d01ef (patch) | |
tree | 915efaddaaebf93a751932dcd58948f8772dc9a9 /qa/rpc-tests | |
parent | 56c87e92110f05d7452f1e85bf755246ffc77206 (diff) | |
download | bitcoin-9c8593d2b4e25ef628172ceadbedf0ef078d01ef.tar.xz |
Implement SipHash in Python
Diffstat (limited to 'qa/rpc-tests')
-rw-r--r-- | qa/rpc-tests/test_framework/siphash.py | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/qa/rpc-tests/test_framework/siphash.py b/qa/rpc-tests/test_framework/siphash.py new file mode 100644 index 0000000000..9c0574bd93 --- /dev/null +++ b/qa/rpc-tests/test_framework/siphash.py @@ -0,0 +1,64 @@ +#!/usr/bin/env python3 +# Copyright (c) 2016 The Bitcoin Core developers +# Distributed under the MIT software license, see the accompanying +# file COPYING or http://www.opensource.org/licenses/mit-license.php. + +# +# siphash.py - Specialized SipHash-2-4 implementations +# +# This implements SipHash-2-4 for 256-bit integers. + +def rotl64(n, b): + return n >> (64 - b) | (n & ((1 << (64 - b)) - 1)) << b + +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) + +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 |