#!/usr/bin/env pythonfrom M2Crypto import RSA, EVP, Randimport time,sys def verify(keyfn, msgfn, outfn, textfn):    print 'verify (%s, %s, %s, %s)' % (keyfn,msgfn,outfn, textfn)    key = RSA.load_pub_key(keyfn)    ft= open(textfn,'rb')    text = ft.read()    ft.close()    shax = EVP.MessageDigest('sha256')    shax.update(text)    dig = shax.digest()    #dig = sha.new(text).digest()    fd = open(msgfn,'rb')    msg = fd.read()    #padding = RSA.pkcs1_padding    padding = RSA.pkcs1_oaep_padding    #ptxt = key.verify(dig,msg, padding)    ptxt = key.verify(dig,msg,algo='sha256')    print 'verify res: ',`ptxt`    fd.close()    print 'done'    if __name__=='__main__':    from optparse import OptionParser    parser = OptionParser(usage='ver [-k] [-o] msg', version='ver 1.0')    parser.add_option('-k','--pub',dest='pubkey', help='public key',default='DevicePublicKey.pem')    parser.add_option('-o','--out',dest='output',help='output file',default='ver.dat')    parser.add_option('-t','--text',dest='text',help='text file', default='dec.dat')    (options,args) = parser.parse_args()    keyfn = options.pubkey    outfn = options.output    textfn = options.text    msgfn = args[0]        verify(keyfn,msgfn,outfn,textfn)