| # Copyright (C) 2003-2007, 2009 Nominum, Inc. |
| # |
| # Permission to use, copy, modify, and distribute this software and its |
| # documentation for any purpose with or without fee is hereby granted, |
| # provided that the above copyright notice and this permission notice |
| # appear in all copies. |
| # |
| # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES |
| # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR |
| # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
| # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| |
| """Common DNSSEC-related functions and constants.""" |
| |
| RSAMD5 = 1 |
| DH = 2 |
| DSA = 3 |
| ECC = 4 |
| RSASHA1 = 5 |
| DSANSEC3SHA1 = 6 |
| RSASHA1NSEC3SHA1 = 7 |
| RSASHA256 = 8 |
| RSASHA512 = 10 |
| INDIRECT = 252 |
| PRIVATEDNS = 253 |
| PRIVATEOID = 254 |
| |
| _algorithm_by_text = { |
| 'RSAMD5' : RSAMD5, |
| 'DH' : DH, |
| 'DSA' : DSA, |
| 'ECC' : ECC, |
| 'RSASHA1' : RSASHA1, |
| 'DSANSEC3SHA1' : DSANSEC3SHA1, |
| 'RSASHA1NSEC3SHA1' : RSASHA1NSEC3SHA1, |
| 'RSASHA256' : RSASHA256, |
| 'RSASHA512' : RSASHA512, |
| 'INDIRECT' : INDIRECT, |
| 'PRIVATEDNS' : PRIVATEDNS, |
| 'PRIVATEOID' : PRIVATEOID, |
| } |
| |
| # We construct the inverse mapping programmatically to ensure that we |
| # cannot make any mistakes (e.g. omissions, cut-and-paste errors) that |
| # would cause the mapping not to be true inverse. |
| |
| _algorithm_by_value = dict([(y, x) for x, y in _algorithm_by_text.iteritems()]) |
| |
| class UnknownAlgorithm(Exception): |
| """Raised if an algorithm is unknown.""" |
| pass |
| |
| def algorithm_from_text(text): |
| """Convert text into a DNSSEC algorithm value |
| @rtype: int""" |
| |
| value = _algorithm_by_text.get(text.upper()) |
| if value is None: |
| value = int(text) |
| return value |
| |
| def algorithm_to_text(value): |
| """Convert a DNSSEC algorithm value to text |
| @rtype: string""" |
| |
| text = _algorithm_by_value.get(value) |
| if text is None: |
| text = str(value) |
| return text |
