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#!/usr/bin/python
"""
DSA demo and benchmark.
Usage: python -O dsa_bench.py [option option option ...]
where options may include:
makenewkey showpubkey showdigest showprofile
md5 sha1 sha256 sha512
NB:
DSA is formally defined with SHA-1 and key length 1024.
The OpenSSL implementation actually supports most any
hashing algorithm and key length, as long as the key
length is longer than the digest length. If not SHA-1
and 1024, you should be very clear. The use of "DSA"
without any qualifiers implies SHA-1 and 1024.
Larry Bugbee
November 2006
Some portions are Copyright (c) 1999-2003 Ng Pheng Siong.
All rights reserved.
Portions created by Open Source Applications Foundation
(OSAF) are Copyright (C) 2004 OSAF. All Rights Reserved.
"""
from M2Crypto import DSA, EVP, Rand
from M2Crypto.EVP import MessageDigest
import sys, base64
# --------------------------------------------------------------
# program parameters
makenewkey = 0 # 1 = make/save new key, 0 = use existing
showpubkey = 0 # 1 = show the public key value
showdigest = 0 # 1 = show the digest value
showprofile = 0 # 1 = use the python profiler
hashalgs = ['md5', 'ripemd160', 'sha1',
'sha224', 'sha256', 'sha384', 'sha512']
# default hashing algorithm
hashalg = 'sha1'
# default key length
keylen = 1024
# number of speed test loops
N1 = N2 = 100
# --------------------------------------------------------------
# functions
def test(dsa, dgst):
print ' testing signing and verification...',
try:
r,s = dsa.sign(dgst)
except Exception, e:
print '\n\n *** %s *** \n' % e
sys.exit()
if not dsa.verify(dgst, r, s):
print 'not ok'
else:
print 'ok'
def test_asn1(dsa, dgst):
# XXX Randomly fails: bug in there somewhere... (0.9.4)
print ' testing asn1 signing and verification...',
blob = dsa.sign_asn1(dgst)
if not dsa.verify_asn1(dgst, blob):
print 'not ok'
else:
print 'ok'
def speed():
from time import time
t1 = time()
for i in range(N1):
r,s = dsa.sign(dgst)
print ' %d signings: %8.2fs' % (N1, (time() - t1))
t1 = time()
for i in range(N2):
dsa.verify(dgst, r, s)
print ' %d verifications: %8.2fs' % (N2, (time() - t1))
def test_speed(dsa, dgst):
print ' measuring speed...'
if showprofile:
import profile
profile.run('speed()')
else:
speed()
print
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
def main(keylen, hashalg):
global dsa, dgst # this exists ONLY for speed testing
Rand.load_file('randpool.dat', -1)
pvtkeyfilename = 'DSA%dpvtkey.pem' % (keylen)
pubkeyfilename = 'DSA%dpubkey.pem' % (keylen)
if makenewkey:
print ' making and saving a new key'
dsa = DSA.gen_params(keylen)
dsa.gen_key()
dsa.save_key(pvtkeyfilename, None ) # no pswd callback
dsa.save_pub_key(pubkeyfilename)
else:
print ' loading an existing key'
dsa = DSA.load_key(pvtkeyfilename)
print ' dsa key length:', len(dsa)
if not dsa.check_key():
raise 'key is not initialised'
if showpubkey:
dsa_pub = dsa.pub
pub_pem = base64.encodestring(dsa_pub)
print ' PEM public key is: \n',pub_pem
# since we are testing signing and verification, let's not
# be fussy about the digest. Just make one.
md = EVP.MessageDigest(hashalg)
md.update('can you spell subliminal channel?')
dgst = md.digest()
print ' hash algorithm: %s' % hashalg
if showdigest:
print ' %s digest: \n%s' % (hashalg, base64.encodestring(dgst))
test(dsa, dgst)
# test_asn1(dsa, dgst)
test_speed(dsa, dgst)
Rand.save_file('randpool.dat')
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
def print_usage():
print """
Usage: python -O %s [option option option ...]
where options may include:
makenewkey showpubkey showdigest showprofile
md5 sha1 sha256 sha512
""" % sys.argv[0]
sys.exit()
# --------------------------------------------------------------
# --------------------------------------------------------------
if __name__=='__main__':
for arg in sys.argv[1:]:
if arg in hashalgs: hashalg = arg; continue
if arg == 'makenewkey': makenewkey = 1; continue
if arg == 'showpubkey': showpubkey = 1; continue
if arg == 'showdigest': showdigest = 1; continue
if arg == 'showprofile': showprofile = 1; continue
try:
keylen = int(arg)
except:
print '\n *** argument "%s" not understood ***' % arg
print_usage()
main(keylen, hashalg)
# --------------------------------------------------------------
# --------------------------------------------------------------
# --------------------------------------------------------------