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Path: /lib64/python2.7/site-packages/M2Crypto/

Viewing File: util.py

"""
    M2Crypto utility routines.
    
    Copyright (c) 1999-2004 Ng Pheng Siong. All rights reserved.
    
    Portions created by Open Source Applications Foundation (OSAF) are
    Copyright (C) 2004 OSAF. All Rights Reserved.
"""

import sys
import m2

class UtilError(Exception): pass

m2.util_init(UtilError)

def h2b(s):
    import array, string
    ar=array.array('c')
    start=0
    if s[:2]=='0x':
        start=2
    for i in range(start, len(s), 2):
        num=string.atoi("%s"%(s[i:i+2],), 16)
        ar.append(chr(num))
    return ar.tostring()        

def pkcs5_pad(data, blklen=8):
    pad=(8-(len(data)%8))
    return data+chr(pad)*pad

def pkcs7_pad(data, blklen):
    if blklen>255:
        raise ValueError, 'illegal block size'
    pad=(blklen-(len(data)%blklen))
    return data+chr(pad)*pad

def octx_to_num(x):
    v = 0L
    lx = len(x)
    for i in range(lx):
        v = v + ord(x[i]) * (256L ** (lx-i-1))
    return v

def genparam_callback(p, n, out=sys.stdout):
    ch = ['.','+','*','\n']
    out.write(ch[p])
    out.flush()

def quiet_genparam_callback(p, n, out):
    pass

def passphrase_callback(v, prompt1='Enter passphrase:', 
                           prompt2='Verify passphrase:'):
    from getpass import getpass
    while 1:
        try:
            p1=getpass(prompt1)
            if v:
                p2=getpass(prompt2)
                if p1==p2:
                    break
            else:
                break
        except KeyboardInterrupt:
            return None
    return p1

def no_passphrase_callback(*args):
    return ''