Mercurial > hgrepos > Python > apps > py-cutils

annotate shasum.py @ 14:409dac636805 v0.1

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+++++ v0.1
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 04 Dec 2020 17:41:34 +0100
parents db64e282b049
children 184ab1da1307
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1 r"""
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2 :Author: Franz Glasner
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3 :Copyright: (c) 2020 Franz Glasner.
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4 All rights reserved.
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5 :License: BSD 3-Clause "New" or "Revised" License.
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6 See :ref:`LICENSE <license>` for details.
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7 If you cannot find LICENSE see
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8 <https://opensource.org/licenses/BSD-3-Clause>
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9 :ID: @(#) HGid$
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10
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11 """
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12
2
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13 from __future__ import print_function
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14
13
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15
14
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16 __version__ = "0.1"
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17
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18
1
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19 import argparse
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20 import hashlib
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21 import io
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22 import re
1
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23 import sys
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24
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25
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26 PY2 = sys.version_info[0] < 3
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27
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28 CHUNK_SIZE = 1024 * 1024 * 1024
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31 def main(argv=None):
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32 aparser = argparse.ArgumentParser(
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33 description="Python implementation of shasum",
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34 fromfile_prefix_chars='@')
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35 aparser.add_argument(
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36 "--algorithm", "-a", action="store", type=argv2algo,
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37 help="1 (default), 224, 256, 384, 512, 3-224, 3-256, 3-384, 3-512, blake2b, blake2s, md5")
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38 aparser.add_argument(
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39 "--binary", "-b", action="store_false", dest="text_mode", default=False,
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40 help="read in binary mode (default)")
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41 aparser.add_argument(
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42 "--bsd", "-B", action="store_true", dest="bsd", default=False,
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43 help="write BSD style output; also :command:`openssl dgst` style")
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44 aparser.add_argument(
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45 "--check", "-c", action="store_true",
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46 help="read digests from FILEs and check them")
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47 aparser.add_argument(
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48 "--reverse", "-r", action="store_false", dest="bsd", default=False,
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49 help="explicitely select normal coreutils style output (to be option compatible with BSD style commands and :command:`openssl dgst -r`)")
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50 aparser.add_argument(
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51 "--tag", action="store_true", dest="bsd", default=False,
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52 help="alias for the `--bsd' option (to be compatible with :command:`b2sum`)")
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53 aparser.add_argument(
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54 "--text", "-t", action="store_true", dest="text_mode", default=False,
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55 help="read in text mode (not supported)")
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56 aparser.add_argument(
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57 "--version", "-v", action="version", version=__version__)
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58 aparser.add_argument(
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59 "files", nargs="*", metavar="FILE")
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60
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61 opts = aparser.parse_args(args=argv)
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62
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63 if opts.text_mode:
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64 print("ERROR: text mode not supported", file=sys.stderr)
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65 sys.exit(78) # :manpage:`sysexits(3)` EX_CONFIG
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66
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67 if not opts.algorithm:
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68 opts.algorithm = argv2algo("1")
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69
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70 if not opts.files:
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71 opts.files.append('-')
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72 if opts.check:
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73 return verify_digests_from_files(opts)
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74 else:
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75 return generate_digests(opts)
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76
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77
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78 def generate_digests(opts):
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79 if opts.bsd:
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80 out = out_bsd
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81 else:
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82 out = out_std
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83 if len(opts.files) == 1 and opts.files[0] == '-':
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84 if PY2:
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85 if sys.platform == "win32":
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86 import os, msvcrt # noqa: E401
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87 msvcrt.setmode(sys.stdin.fileno(), os.O_BINARY)
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88 source = sys.stdin
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89 else:
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90 source = sys.stdin.buffer
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91 out(sys.stdout,
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92 compute_digest(opts.algorithm[0], source),
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93 None,
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94 opts.algorithm[1],
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95 True)
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96 else:
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97 for fn in opts.files:
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98 with open(fn, "rb") as source:
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99 out(sys.stdout,
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100 compute_digest(opts.algorithm[0], source),
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101 fn,
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102 opts.algorithm[1],
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103 True)
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104 return 0
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105
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106
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107 def verify_digests_from_files(opts):
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108 exit_code = 0
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109 if len(opts.files) == 1 and opts.files[0] == '-':
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110 for checkline in sys.stdin:
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111 if not checkline:
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112 continue
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113 r, fn = handle_checkline(opts, checkline)
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114 print("{}: {}".format(fn, r.upper()))
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115 if r != "ok" and exit_code == 0:
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116 exit_code = 1
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117 else:
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118 for fn in opts.files:
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119 with io.open(fn, "rt", encoding="utf-8") as checkfile:
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120 for checkline in checkfile:
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121 if not checkline:
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122 continue
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123 r, fn = handle_checkline(opts, checkline)
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124 print("{}: {}".format(fn, r.upper()))
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125 if r != "ok" and exit_code == 0:
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126 exit_code = 1
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127 return exit_code
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128
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129
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130 def handle_checkline(opts, line):
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131 """
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132 :return: a tuple with static "ok", "missing", or "failed" and the filename
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133 :rtype: tuple(str, str)
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134
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135 """
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136 # determine checkfile format (BSD or coreutils)
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137 # BSD?
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138 mo = re.search(r"\A(\S+)\s*\((.*)\)\s*=\s*(.+)\n?\Z", line)
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diff changeset
139 if mo:
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140 algo = algotag2algotype(mo.group(1))
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141 fn = mo.group(2)
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142 digest = mo.group(3)
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143 else:
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144 mo = re.search(r"([^\ ]+) [\*\ ]?(.+)\n?\Z", line)
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145 if mo:
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146 algo = opts.algorithm[0]
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147 fn = mo.group(2)
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148 digest = mo.group(1)
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149 else:
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150 raise ValueError(
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151 "improperly formatted digest line: {}".format(line))
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152 try:
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153 with open(fn, "rb") as input:
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154 d = compute_digest(algo, input)
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155 if d.lower() == digest.lower():
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156 return ("ok", fn)
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157 else:
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158 return ("failed", fn)
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159 except EnvironmentError:
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160 return ("missing", fn)
5
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161
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162
7
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163 def argv2algo(s):
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164 """Convert a commane line algorithm specifier into a tuple with the
12
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165 type/factory of the digest and the algorithms tag for output purposes.
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166
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167 :param str s: the specifier from the commane line
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168 :return: the internal digest specification
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169 :rtype: a tuple (digest_type_or_factory, name_in_output)
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170
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171 String comparisons are done case-insensitively.
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172
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173 """
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174 s = s.lower()
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175 if s in ("1", "sha1"):
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176 return (hashlib.sha1, "SHA1")
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177 elif s in ("224", "sha224"):
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178 return (hashlib.sha224, "SHA224")
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179 elif s in ("256", "sha256"):
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180 return (hashlib.sha256, "SHA256")
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181 elif s in ("384", "sha384"):
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182 return (hashlib.sha384, "SHA384")
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183 elif s in ("512", "sha512"):
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184 return (hashlib.sha512, "SHA512")
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185 elif s in ("3-224", "sha3-224"):
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186 return (hashlib.sha3_224, "SHA3-224")
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187 elif s in ("3-256", "sha3-256"):
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188 return (hashlib.sha3_256, "SHA3-256")
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189 elif s in ("3-384", "sha3-384"):
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190 return (hashlib.sha3_384, "SHA3-384")
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191 elif s in ("3-512", "sha3-512"):
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192 return (hashlib.sha3_512, "SHA3-512")
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193 elif s in ("blake2b", "blake2b-512"):
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194 return (hashlib.blake2b, "BLAKE2b")
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195 elif s in ("blake2s", "blake2s-256"):
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196 return (hashlib.blake2s, "BLAKE2s")
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197 elif s == "md5":
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198 return (hashlib.md5, "MD5")
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199 else:
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200 raise argparse.ArgumentTypeError(
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201 "`{}' is not a recognized algorithm".format(s))
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202
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203
12
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204 def algotag2algotype(s):
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205 """Convert the algorithm specifier in a BSD-style digest file to the
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diff changeset
206 type/factory of the corresponding algorithm.
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diff changeset
207
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diff changeset
208 :param str s: the tag (i.e. normalized name) or the algorithm
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diff changeset
209 :return: the digest type or factory for `s`
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210
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211 All string comparisons are case-sensitive.
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212
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213 """
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214 if s == "SHA1":
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215 return hashlib.sha1
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216 elif s == "SHA224":
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217 return hashlib.sha224
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218 elif s == "SHA256":
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219 return hashlib.sha256
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220 elif s == "SHA384":
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221 return hashlib.sha384
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222 elif s == "SHA512":
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223 return hashlib.sha512
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224 elif s == "SHA3-224":
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225 return hashlib.sha3_224
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226 elif s == "SHA3-256":
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227 return hashlib.sha3_256
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228 elif s == "SHA3-384":
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229 return hashlib.sha3_384
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230 elif s == "SHA3-512":
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diff changeset
231 return hashlib.sha3_512
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diff changeset
232 elif s == "BLAKE2b":
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diff changeset
233 return hashlib.blake2b
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diff changeset
234 elif s == "BLAKE2s":
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diff changeset
235 return hashlib.blake2s
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diff changeset
236 elif s == "MD5":
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diff changeset
237 return hashlib.md5
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diff changeset
238 else:
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diff changeset
239 raise ValueError("unknown algorithm: {}".format(s))
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diff changeset
240
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diff changeset
241
5
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diff changeset
242 def out_bsd(dest, digest, filename, digestname, binary):
9
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diff changeset
243 """BSD format output, also :command:`openssl dgst` and
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diff changeset
244 :command:`b2sum --tag" format output
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245
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diff changeset
246 """
5
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diff changeset
247 if filename is None:
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diff changeset
248 print(digest, file=dest)
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diff changeset
249 else:
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diff changeset
250 print("{} ({}) = {}".format(digestname, filename, digest),
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diff changeset
251 file=dest)
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diff changeset
252
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diff changeset
253
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diff changeset
254 def out_std(dest, digest, filename, digestname, binary):
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diff changeset
255 """Coreutils format (:command:`shasum` et al.)
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256
81f28bf89c26 Some more output selection options and documentation
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257 """
5
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258 print("{} {}{}".format(digest,
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259 '*' if binary else ' ',
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260 '-' if filename is None else filename),
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261 file=dest)
2
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262
1
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263
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264 def compute_digest(hashobj, instream):
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265 """
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266
2
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267 :param hashobj: a :mod:`hashlib` compatible hash algorithm type or factory
1
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268 :param instream: a bytes input stream to read the data to be hashed from
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269 :return: the digest in hex form
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270 :rtype: str
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271
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272 """
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273 h = hashobj()
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274 while True:
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275 buf = instream.read(CHUNK_SIZE)
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276 if buf is not None:
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277 if len(buf) == 0:
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278 break
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279 h.update(buf)
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280 return h.hexdigest()
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281
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282
1
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283 if __name__ == "__main__":
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284 sys.exit(main())