t_des.py

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

from M2Crypto import EVP,Rand
import cStringIO

def cipher_filter(cipher,inf,outf):
    while 1:
        buf = inf.read()
        if not buf:
            break
        outf.write(cipher.update(buf))
    outf.write(cipher.final())
    return outf.getvalue()

#def test():
if __name__=='__main__':
    f=open('des_data/EFsk.4.bin','rb')
    key = f.read()
    f.close()
    enc=1
    dec=0
    skip="""
    otxt='hello wolrd'
    k=EVP.Cipher('des_ede_cbc',key,'00000000',enc) #,1,'sha1','saltsalt',5)
    pbuf=cStringIO.StringIO(otxt)
    cbuf =cStringIO.StringIO()
    ctxt = cipher_filter(k,pbuf,cbuf)
    pbuf.close()
    cbuf.close()
"""
    f1 = open('des_data/3DESEncrypted.bin','rb')
    ctxt = f1.read()
    f1.close()
    print `ctxt`
    
    j = EVP.Cipher('des_ede_cbc',key,'\x00\x00\x00\x00\x00\x00\x00\x00',dec) #,1,'sha1','saltsalt',5)
    pbuf =cStringIO.StringIO()
    cbuf =cStringIO.StringIO(ctxt)
    ptxt = cipher_filter(j, cbuf, pbuf)
    pbuf.close()
    cbuf.close()
    print `ptxt`