t_des_dec.py

It is an experimental testing for python M2Crypto module. M2Crypto is not well document. User may no

from M2Crypto import EVP
import cStringIO
import time

def test1():
    key = '\xC8\xF6\xE4\x74\xC1\x55\x6E\x38\xF7\x75\xF6\xA9\x58\x80\x2C\x08'
    dec=0
    for i in range(512):
        f=open('testv/msg%03d' % i,'rb')
        msg = f.read()
        f.close()
        f=open('testv/des%03d' % i,'rb')
        ctxt = f.read()
        f.close()
        cip = EVP.Cipher('des_ede_cbc',key,'\x00\x00\x00\x00\x00\x00\x00\x00',dec) 
        pbuf = cStringIO.StringIO()
        cbuf = cStringIO.StringIO(ctxt)
        while 1:
            buf = cbuf.read()
            if not buf:
                break
            pbuf.write(cip.update(buf))
        pbuf.write(cip.final())
        ptxt = pbuf.getvalue()
        pbuf.close()
        cbuf.close()
        #print 'ptxt:',`ptxt`
        #print 'msg:',`msg`
        if ptxt ==msg:
            print '%d ok' % i
        else:
            print '%d failure' % i

def test2():
    key = '\xC8\xF6\xE4\x74\xC1\x55\x6E\x38\xF7\x75\xF6\xA9\x58\x80\x2C\x08'
    dec=0
    ctxts=[]
    for i in range(512):
        f=open('testv/des%03d' % i,'rb')
        ctxts.append(f.read())
        f.close()
    n=0
    i=0
    t1=time.time()
    print t1
    while 1:
        cip = EVP.Cipher('des_ede_cbc',key,'\x00\x00\x00\x00\x00\x00\x00\x00',dec) 
        pbuf = cStringIO.StringIO()
        cbuf = cStringIO.StringIO(ctxts[i])
        while 1:
            buf = cbuf.read()
            if not buf:
                break
            pbuf.write(cip.update(buf))
        pbuf.write(cip.final())
        ctxt = pbuf.getvalue()
        pbuf.close()
        cbuf.close()
        n+=1
        t2=time.time()
        if t2-t1 > 10:
            break
        i+=1
        if i > 511:
            i=0
    print t2
    print 'passed:', t2-t1
    print n
    return t2-t1,n

def loop_test2():
    N=10
    sum=0
    for i in range(N):
        tx,n = test2()
        sum+=n
        time.sleep(10)
    print 'average:', sum/N

if __name__=='__main__':
    #test1()
    loop_test2()