On Thu, 31 Jan 2013 08:43:03 -0800 (PST), kryptox.excha...@gmail.com wrote:
> I'm wondering if anyone can help me as I can't seem to get > this to work. There is an online dice game that is > provably fair by calculating the 'dice roll' using using a > sha256 hash calculated against my transaction ID generated > by me. The secret used to make the calculation is revealed > at the end of each day thus allowing you to prove they > didn't cheat. So they provide the following to allow you > to verify the calculation of the dice roll: > > Secret used = > r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA > Secret hash > sha256(r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA) > = 48d78d573b9b8e11a13a72d9a78011f2e5d9754d89de47b209f32c51777f535d > Lucky hash > sha256(r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA:108128 > 06653842663997bf5971637f86f26c71a4716276d7fa8f323a83588d91:1) = > dfa8769be81a543002865c88a5b52fa07f3b67fc7cd9b519c3f6a6452bcd48e4 > > Lucky Number 0x48e4 = 18660 > > So, I'm doing the following: > > C:\Python27>python > Python 2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit (AMD64)] on > win32 > Type "help", "copyright", "credits" or "license" for more information. >>>> import hashlib, hmac >>>> txid = >>>> 'r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA' >>>> secret = >>>> '10812806653842663997bf5971637f86f26c71a4716276d7fa8f323a83588d91:1' [snip] >>> txid = >>> 'r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA' >>> secret = >>> '10812806653842663997bf5971637f86f26c71a4716276d7fa8f323a83588d91:1' >>> hashlib.sha256(txid+":"+secret).hexdigest() 'dfa8769be81a543002865c88a5b52fa07f3b67fc7cd9b519c3f6a6452bcd48e4' >>> 0x48e4 18660 >>> . . . which is the number you wanted, right? -- To email me, substitute nowhere->spamcop, invalid->net. -- http://mail.python.org/mailman/listinfo/python-list
