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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 6 # appear in all copies. 7 # 8 # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES 9 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR 11 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 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 INDIRECT = 252 26 PRIVATEDNS = 253 27 PRIVATEOID = 254 28 29 _algorithm_by_text = { 30 'RSAMD5' : RSAMD5, 31 'DH' : DH, 32 'DSA' : DSA, 33 'ECC' : ECC, 34 'INDIRECT' : INDIRECT, 35 'PRIVATEDNS' : PRIVATEDNS, 36 'PRIVATEOID' : PRIVATEOID, 37 } 38 39 # We construct the inverse mapping programmatically to ensure that we 40 # cannot make any mistakes (e.g. omissions, cut-and-paste errors) that 41 # would cause the mapping not to be true inverse. 42 43 _algorithm_by_value = dict([(y, x) for x, y in _algorithm_by_text.iteritems()]) 44 4850 """Convert text into a DNSSEC algorithm value 51 @rtype: int""" 52 53 value = _algorithm_by_text.get(text.upper()) 54 if value is None: 55 value = int(text) 56 return value5759 """Convert a DNSSEC algorithm value to text 60 @rtype: string""" 61 62 text = _algorithm_by_value.get(value) 63 if text is None: 64 text = str(value) 65 return text66
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