Package dns :: Module dnssec
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Source Code for Module dns.dnssec

 1  # Copyright (C) 2003-2007, 2009 Nominum, Inc. 
 2  # 
 3  # Permission to use, copy, modify, and distribute this software and its 
 4  # documentation for any purpose with or without fee is hereby granted, 
 5  # provided that the above copyright notice and this permission notice 
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 8  # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES 
 9  # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 
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14  # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 
15   
16  """Common DNSSEC-related functions and constants.""" 
17   
18  RSAMD5 = 1 
19  DH = 2 
20  DSA = 3 
21  ECC = 4 
22  RSASHA1 = 5 
23  DSANSEC3SHA1 = 6 
24  RSASHA1NSEC3SHA1 = 7 
25  RSASHA256 = 8 
26  RSASHA512 = 10 
27  INDIRECT = 252 
28  PRIVATEDNS = 253 
29  PRIVATEOID = 254 
30   
31  _algorithm_by_text = { 
32      'RSAMD5' : RSAMD5, 
33      'DH' : DH, 
34      'DSA' : DSA, 
35      'ECC' : ECC, 
36      'RSASHA1' : RSASHA1, 
37      'DSANSEC3SHA1' : DSANSEC3SHA1, 
38      'RSASHA1NSEC3SHA1' : RSASHA1NSEC3SHA1, 
39      'RSASHA256' : RSASHA256, 
40      'RSASHA512' : RSASHA512, 
41      'INDIRECT' : INDIRECT, 
42      'PRIVATEDNS' : PRIVATEDNS, 
43      'PRIVATEOID' : PRIVATEOID, 
44      } 
45   
46  # We construct the inverse mapping programmatically to ensure that we 
47  # cannot make any mistakes (e.g. omissions, cut-and-paste errors) that 
48  # would cause the mapping not to be true inverse. 
49   
50  _algorithm_by_value = dict([(y, x) for x, y in _algorithm_by_text.iteritems()]) 
51   
52 -class UnknownAlgorithm(Exception):
53 """Raised if an algorithm is unknown.""" 54 pass
55
56 -def algorithm_from_text(text):
57 """Convert text into a DNSSEC algorithm value 58 @rtype: int""" 59 60 value = _algorithm_by_text.get(text.upper()) 61 if value is None: 62 value = int(text) 63 return value
64
65 -def algorithm_to_text(value):
66 """Convert a DNSSEC algorithm value to text 67 @rtype: string""" 68 69 text = _algorithm_by_value.get(value) 70 if text is None: 71 text = str(value) 72 return text
73