Mercurial > hgrepos > Python > apps > py-cutils

annotate cutils/util/__init__.py @ 118:12339ac2148d

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Move some functions into cutils.util (i.e. algorithms and their aliases)
author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 29 Dec 2024 18:22:22 +0100
parents e15b3d1ff0d9
children a548783381b6
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115
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1 # -*- coding: utf-8 -*-
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2 # :-
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3 # :Copyright: (c) 2020-2024 Franz Glasner
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4 # :License: BSD-3-Clause
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5 # :-
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6 r"""Utility package.
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7
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8 """
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9
118
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10 __all__ = ["normalize_filename",
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11 "argv2algo",
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12 "algotag2algotype",
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13 "get_blake2b",
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14 "get_blake2b_256",
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15 "get_blake2s",
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16 ]
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17
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18
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19 import argparse
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20 import hashlib
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21
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22
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23 def get_blake2b():
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24 """Get the factory for blake2b"""
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25 try:
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26 return hashlib.blake2b
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27 except AttributeError:
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28 import pyblake2
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29 return pyblake2.blake2b
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31
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32 def get_blake2b_256():
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33 """Get the factory for blake2b-256"""
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34
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35 try:
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36 hashlib.blake2b
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37 except AttributeError:
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38 import pyblake2
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39
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40 def _get_blake():
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41 return pyblake2.blake2b(digest_size=32)
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42
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43 else:
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44
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45 def _get_blake():
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46 return hashlib.blake2b(digest_size=32)
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47
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48 return _get_blake
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50
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51 def get_blake2s():
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52 """Get the factory for blake2s"""
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53 try:
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54 return hashlib.blake2s
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55 except AttributeError:
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56 import pyblake2
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57 return pyblake2.blake2s
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58
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59
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60 def argv2algo(s):
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61 """Convert a command line algorithm specifier into a tuple with the
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62 type/factory of the digest and the algorithms tag for output purposes.
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63
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64 :param str s: the specifier from the commane line
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65 :return: the internal digest specification
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66 :rtype: a tuple (digest_type_or_factory, name_in_output)
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67 :raises argparse.ArgumentTypeError: for unrecognized algorithms or names
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68
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69 String comparisons are done case-insensitively.
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70
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71 """
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72 s = s.lower()
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73 if s in ("1", "sha1"):
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74 return (hashlib.sha1, "SHA1")
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75 elif s in ("224", "sha224"):
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76 return (hashlib.sha224, "SHA224")
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77 elif s in ("256", "sha256"):
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78 return (hashlib.sha256, "SHA256")
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79 elif s in ("384", "sha384"):
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80 return (hashlib.sha384, "SHA384")
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81 elif s in ("512", "sha512"):
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82 return (hashlib.sha512, "SHA512")
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83 elif s in ("3-224", "sha3-224"):
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84 return (hashlib.sha3_224, "SHA3-224")
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85 elif s in ("3-256", "sha3-256"):
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86 return (hashlib.sha3_256, "SHA3-256")
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87 elif s in ("3-384", "sha3-384"):
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88 return (hashlib.sha3_384, "SHA3-384")
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89 elif s in ("3-512", "sha3-512"):
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90 return (hashlib.sha3_512, "SHA3-512")
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91 elif s in ("blake2b", "blake2b-512", "blake2", "blake2-512"):
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92 return (get_blake2b(), "BLAKE2b")
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93 elif s in ("blake2s", "blake2s-256"):
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94 return (get_blake2s(), "BLAKE2s")
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95 elif s in ("blake2-256", "blake2b-256"):
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96 return (get_blake2b_256(), "BLAKE2b-256")
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97 elif s == "md5":
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98 return (hashlib.md5, "MD5")
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99 else:
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100 raise argparse.ArgumentTypeError(
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101 "`{}' is not a recognized algorithm".format(s))
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102
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103
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104 def algotag2algotype(s):
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105 """Convert the algorithm specifier in a BSD-style digest file to the
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106 type/factory of the corresponding algorithm.
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107
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108 :param str s: the tag (i.e. normalized name) or the algorithm
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109 :return: the digest type or factory for `s`
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110 :raises ValueError: on unknown and/or unhandled algorithms
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111
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112 All string comparisons are case-sensitive.
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113
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114 """
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115 if s == "SHA1":
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116 return hashlib.sha1
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117 elif s == "SHA224":
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118 return hashlib.sha224
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119 elif s == "SHA256":
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120 return hashlib.sha256
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121 elif s == "SHA384":
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122 return hashlib.sha384
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123 elif s == "SHA512":
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124 return hashlib.sha512
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125 elif s == "SHA3-224":
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126 return hashlib.sha3_224
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127 elif s == "SHA3-256":
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128 return hashlib.sha3_256
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129 elif s == "SHA3-384":
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130 return hashlib.sha3_384
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131 elif s == "SHA3-512":
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132 return hashlib.sha3_512
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133 elif s in ("BLAKE2b", "BLAKE2b-512", "BLAKE2b512"): # compat for openssl
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134 return get_blake2b()
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135 elif s in ("BLAKE2s", "BLAKE2s-256", "BLAKE2s256"): # compat for openssl
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136 return get_blake2s()
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137 elif s in ("BLAKE2b-256", "BLAKE2b256"): # also compat for openssl dgst
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138 return get_blake2b_256()
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139 elif s == "MD5":
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140 return hashlib.md5
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141 else:
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142 raise ValueError("unknown algorithm: {}".format(s))
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143
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144
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145 def normalize_filename(filename, strip_leading_dot_slash=False):
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146 filename = filename.replace("\\", "/")
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147 if strip_leading_dot_slash:
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148 while filename.startswith("./"):
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149 filename = filename[2:]
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150 return filename