| 1 | #! /usr/bin/python |
| 2 | ### -*-python-*- |
| 3 | ### |
| 4 | ### Generate test vectors for universal hashing. |
| 5 | |
| 6 | MOD = 0x104c11db7 |
| 7 | |
| 8 | def gfmul(x, y): |
| 9 | a = 0 |
| 10 | while y > 0: |
| 11 | if y & 1: a ^= x |
| 12 | if x & 0x80000000: x = (x << 1) ^ MOD |
| 13 | else: x <<= 1 |
| 14 | y >>= 1 |
| 15 | return a |
| 16 | |
| 17 | def hashtest(k, m): |
| 18 | h = k |
| 19 | for ch in m: h = gfmul(h ^ ord(ch), k) |
| 20 | print ' 0x%08x "%s" 0x%08x;' % (k, m, h) |
| 21 | |
| 22 | print '''\ |
| 23 | ### Test vectors for universal hashing |
| 24 | ### [generated] |
| 25 | |
| 26 | hash {''' |
| 27 | |
| 28 | for k, m in [(0x00000000, 'anything you like'), |
| 29 | (0x12345678, 'an exaple test string'), |
| 30 | (0xb8a171f0, 'The quick brown fox jumps over the lazy dog.'), |
| 31 | (0x2940521b, 'A man, a plan, a canal: Panama!')]: |
| 32 | hashtest(k, m) |
| 33 | |
| 34 | k, m = 0x94b22a73, 0xbb7b1fef |
| 35 | for i in xrange(48): |
| 36 | hashtest(k, "If we don't succeed, we run the risk of failure.") |
| 37 | k = gfmul(k, m) |
| 38 | |
| 39 | print '}' |