initial commit

ppgen.py

@@ -0,0 +1,102 @@
+#!/usr/bin/python3
+from math import *
+import random
+import string
+import sys
+import os
+
+from common import *
+from longrandom import LongRandom
+from worddict import words
+
+print("Content-Type: text/html")
+print()
+
+qs = os.environ.get('QUERY_STRING', None)
+if not qs:
+	minlen = 1
+	maxlen = 8
+	numlen = 2
+	wordcount = 3
+	extra_symbols = ''
+	randcaps = 'first'
+else:
+	form = cgi.FieldStorage()
+	wordcount = form_get(form, 'wordcount', 3, int)
+	minlen = form_get(form, 'minlen', 2, int)
+	maxlen = form_get(form, 'maxlen', 8, int)
+	numlen = form_get(form, 'numlen', 2, int)
+	randcaps = form_get(form, 'randcaps', 'first', str)
+
+dumpfile('header.html', {'type':'Passphrase'})
+dict = EvalDict(vars())
+here = os.path.dirname(__file__)
+form_path = os.path.join(here, 'ppform.html')
+with open(form_path, encoding="utf-8") as f:
+    sys.stdout.write(f.read() % dict)
+
+usewords = [ ]
+totalen = 0
+for i in range(minlen, maxlen+1):
+	totalen += len(words[i]) * i
+	usewords.extend(words[i])
+
+log_2 = log(2)
+wordbits = log(len(usewords)) / log_2
+medlen = len(usewords[len(usewords)//2])
+avglen = totalen / len(usewords)
+if randcaps == 'first':
+	capbits = 1
+	capmult = 2
+elif randcaps == 'one':
+	# Use estimate based on average word length
+	capbits = log(avglen+1) / log_2
+	capmult = avglen+1
+elif randcaps == 'all':
+	# One bit per average word length
+	capbits = avglen
+	capmult = 2**avglen
+else:
+	capbits = 0
+	capmult = 1
+numbits = log(10) * numlen / log_2
+numfmt = '{{:0{}}}'.format(numlen)
+passbits = (wordbits + capbits) * wordcount + numbits * ((wordcount - 1) or 1)
+
+table_start()
+row('Word count', commafy(len(usewords)))
+row('Average word length', '%.2f' % avglen)
+row('Bits per word', '%.2f' % wordbits)
+row('Bits per number', '%.2f' % numbits)
+row('Bits for capitalization', '%.2f' % (capbits * wordcount))
+row('Effective passphrase bits', int(passbits))
+row('Total possible combinations',
+	commafy(len(usewords)**wordcount * (10**numlen)**((wordcount-1) or 1) * capmult**wordcount))
+table_end()
+
+randval = LongRandom()
+
+table_start()
+print("<tr><th>Passphrase</th></tr>")
+for i in range(10):
+	passphrase = ''
+	for j in range(wordcount):
+		word = usewords[randval.get(len(usewords))]
+		if randcaps == 'first':
+			if randval.get(2):
+				word = word[0].upper() + word[1:]
+		elif randcaps == 'one':
+			k = randval.get(len(word)+1)
+			if k < len(word):
+				word = word[:k] + word[k].upper() + word[k+1:]
+		elif randcaps == 'all':
+			word = ''.join([ randval.get(2) and ch.upper() or ch.lower()
+							 for ch in word ])
+		passphrase += word
+		if numlen > 0 and (j < wordcount-1 or wordcount == 1):
+			passphrase += numfmt.format(randval.get(10 ** numlen))
+
+	print("<tr><td><tt>%s</tt></td></tr>" % escape(passphrase))
+
+table_end()
+dumpfile('footer.html')