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# ˆl–ß=¿J ¥4Ò‚ D Eq¶î21hßÀ „BóŸÃ ?÷ # rfc1751.py : Converts between 128-bit strings and a human-readable # sequence of words, as defined in RFC1751: "A Convention for # Human-Readable 128-bit Keys", by Daniel L. McDonald. # # Part of the Python Cryptography Toolkit # # Written by Andrew M. Kuchling and others # # =================================================================== # The contents of this file are dedicated to the public domain. To # the extent that dedication to the public domain is not available, # everyone is granted a worldwide, perpetual, royalty-free, # non-exclusive license to exercise all rights associated with the # contents of this file for any purpose whatsoever. # No rights are reserved. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS # BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN # ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE # SOFTWARE. # =================================================================== __revision__ = "$Id$" import binascii from Crypto.Util.py3compat import * binary={0:'0000', 1:'0001', 2:'0010', 3:'0011', 4:'0100', 5:'0101', 6:'0110', 7:'0111', 8:'1000', 9:'1001', 10:'1010', 11:'1011', 12:'1100', 13:'1101', 14:'1110', 15:'1111'} def _key2bin(s): "Convert a key into a string of binary digits" kl=map(lambda x: bord(x), s) kl=map(lambda x: binary[x>>4]+binary[x&15], kl) return ''.join(kl) def _extract(key, start, length): """Extract a bitstring(2.x)/bytestring(2.x) from a string of binary digits, and return its numeric value.""" k=key[start:start+length] return reduce(lambda x,y: x*2+ord(y)-48, k, 0) def key_to_english (key): """key_to_english(key:string(2.x)/bytes(3.x)) : string Transform an arbitrary key into a string containing English words. The key length must be a multiple of 8. """ english='' for index in range(0, len(key), 8): # Loop over 8-byte subkeys subkey=key[index:index+8] # Compute the parity of the key skbin=_key2bin(subkey) ; p=0 for i in range(0, 64, 2): p=p+_extract(skbin, i, 2) # Append parity bits to the subkey skbin=_key2bin(subkey+bchr((p<<6) & 255)) for i in range(0, 64, 11): english=english+wordlist[_extract(skbin, i, 11)]+' ' return english[:-1] # Remove the trailing space def english_to_key (s): """english_to_key(string):string(2.x)/bytes(2.x) Transform a string into a corresponding key. The string must contain words separated by whitespace; the number of words must be a multiple of 6. """ L=s.upper().split() ; key=b('') for index in range(0, len(L), 6): sublist=L[index:index+6] ; char=9*[0] ; bits=0 for i in sublist: index = wordlist.index(i) shift = (8-(bits+11)%8) %8 y = index << shift cl, cc, cr = (y>>16), (y>>8)&0xff, y & 0xff if (shift>5): char[bits>>3] = char[bits>>3] | cl