[pycrypto] example

[avo ga]

Hi:

I can't find any example for DSA or ELGAMAL(with google).
so i wrote a simple example.

http://www.jabbertor.de/wp-content/uploads/2009/08/pycryptotest.txt

Could someone help to check this?
maybe some Hint about security or perfoumance?
The script is not commented, sry for that

#!/usr/bin/env python
from Crypto.Cipher import AES
import os,sys,random
#####################AES
print "=====AES 256 Demo====="
PWD=""
Initial16bytes='0123456789ABCDEF'

a=0
for a in xrange(0,32):
    b=hex(random.randint(1,16)-1)
    PWD+=b.replace("0x","")
print "AES-key",PWD
crypt = AES.new(PWD,AES.MODE_CBC,Initial16bytes)

plain="blabla what the hack blabla."
restbyte = 32-len(plain)%32
temp=""
a=0
for a in xrange(restbyte):
    temp+=" "

plain+=temp
print "text: \n",plain
c= crypt.encrypt(plain)
print "encrypted text: "
print c.encode("hex")
crypt = AES.new(PWD,AES.MODE_CBC,Initial16bytes)
print "decrypted text: \n", crypt.decrypt(c)
#################### RSA
print "\n=====RSA 368 Demo====="
from Crypto.PublicKey import RSA
from Crypto.Util.randpool import RandomPool
rpool = RandomPool()

privatekeyCMS = RSA.generate(368, rpool.get_bytes)
privatekeyClient = RSA.generate(368, rpool.get_bytes)
publickeyCMS = privatekeyCMS.publickey()
publickeyClient = privatekeyClient.publickey()

signed_PWD = privatekeyCMS.sign(PWD,"")
enc_PWD = publickeyClient.encrypt(PWD, "")
print "with publickeyClient encrypted AES-PWD:"
print enc_PWD
print "with privatekeyCMS signed AES-PWD:"
print signed_PWD


dec_PWD= privatekeyClient.decrypt(enc_PWD[0])
print "identity check:\n",publickeyCMS.verify(dec_PWD,signed_PWD)
print "decrypted PWD:\n",dec_PWD


#################### ELGAMAL
K=""
a=0
for a in xrange(0,16):
    b=hex(random.randint(1,16)-1)
    K+=b.replace("0x","")



print "\n=====ELGamal 368 Demo====="
from Crypto.PublicKey import ElGamal
from Crypto.Util.randpool import RandomPool
rpool = RandomPool()

privatekeyCMS = ElGamal.generate(368, rpool.get_bytes)
privatekeyClient = ElGamal.generate(368, rpool.get_bytes)
publickeyCMS = privatekeyCMS.publickey()
publickeyClient = privatekeyClient.publickey()


enc_PWD = publickeyClient.encrypt(PWD, K)
print privatekeyCMS.can_sign()
signed_PWD = privatekeyCMS.sign(PWD,97)
print "with publickeyClient encrypted AES-PWD:"
print enc_PWD
print "with privatekeyCMS signed AES-PWD:"
print signed_PWD


dec_PWD= privatekeyClient.decrypt(enc_PWD)
print "identity check:\n",publickeyCMS.verify(dec_PWD,signed_PWD)
print "decrypted PWD:\n",dec_PWD

#################### DSA only sign
K=""
a=0
for a in xrange(0,16):
    b=hex(random.randint(1,16)-1)
    K+=b.replace("0x","")

print "\n=====DSA 368 Demo====="
from Crypto.PublicKey import DSA
rpool = RandomPool()

privatekeyCMS = DSA.generate(368, rpool.get_bytes)
publickeyCMS = privatekeyCMS.publickey()
signed_PWD = privatekeyCMS.sign(PWD,K)
print "identity check:\n",publickeyCMS.verify(dec_PWD,signed_PWD)
print "decrypted PWD from ELGAMAL:\n",dec_PWD
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