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dice: fix the tiniest bias 

Max value from the hash is 0xffffffff, not 0x100000000
This commit is contained in:
moneromooo 2015-01-31 13:01:03 +00:00
parent 7cdff67421
commit c866a1b74f
1 changed files with 3 additions and 3 deletions
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6
tipbot/modules/dice.py
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@ -39,7 +39,7 @@ def Roll(link):
try:
s = GetServerSeed(link,'dice') + ":" + GetPlayerSeed(link,'dice') + ":" + str(rolls)
sh = hashlib.sha256(s).hexdigest()
roll = float(long(sh[0:8],base=16))/0x100000000
roll = float(long(sh[0:8],base=16))/0xffffffff
return rolls, roll
except Exception,e:
log_error('Failed to roll for %s: %s' % (identity,str(e)))
@ -203,7 +203,7 @@ def Fair(link,cmd):
link.send_private("for future rolls. Then follow these steps:")
link.send_private("Calculate the SHA-256 sum of serverseed:playerseed:rollnumber")
link.send_private("Take the first 8 characters of this sum to make an hexadecimal")
link.send_private("number, and divide it by 0x100000000. You will end up with a number")
link.send_private("number, and divide it by 0xffffffff. You will end up with a number")
link.send_private("between 0 and 1 which was your roll for that particular bet")
link.send_private("See !faircode for Python code implementing this check")
@ -215,7 +215,7 @@ def FairCode(link,cmd):
link.send_private("import sys,hashlib,random")
link.send_private("try:")
link.send_private(" s=hashlib.sha256(sys.argv[1]+':'+sys.argv[2]+':'+sys.argv[3]).hexdigest()")
link.send_private(" roll = float(long(s[0:8],base=16))/0x100000000")
link.send_private(" roll = float(long(s[0:8],base=16))/0xffffffff")
link.send_private(" print '%.16g' % roll")
link.send_private("except:")
link.send_private(" print 'need serverseed, playerseed, and roll number'")