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import abc |
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import base64 |
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import binascii |
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import hashlib |
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from typing import Literal, SupportsBytes |
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7
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try: |
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8
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import base2048 |
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except ImportError: |
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base2048 = None |
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11
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12
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Encoding = ( |
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Literal["2048"] # for fun |
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| Literal["base85"] |
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| Literal["base64"] |
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| Literal["base64url"] |
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| Literal["base64url-tilde"] |
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| Literal["base32"] |
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| Literal["base32-tilde"] |
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| Literal["base32hex"] |
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| Literal["base32hex-tilde"] |
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| Literal["base32-bech32"] |
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| Literal["base32-bech32-tilde"] |
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| Literal["base32hex-bech32"] |
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| Literal["base32hex-bech32-tilde"] |
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| Literal["base16"] |
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| Literal["hex"] |
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) |
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HashAlgorithm = ( |
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Literal["shake_256"] |
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| Literal["shake_128"] |
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| Literal["sha3_512"] |
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| Literal["sha3_384"] |
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| Literal["sha3_256"] |
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| Literal["sha3_224"] |
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| Literal["sha2_512"] |
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| Literal["sha2_256"] |
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| Literal["sha2_224"] |
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| Literal["sha1"] |
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| Literal["md5"] |
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| Literal["crc32"] |
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) |
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class Enc(metaclass=abc.ABCMeta): |
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@property |
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def name(self) -> str: |
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return self.__class__.__name__.lower() |
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def encode(self, d: bytes) -> str: |
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raise NotImplementedError() |
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def decode(self, d: str) -> bytes: |
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raise NotImplementedError() |
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59
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class Base16(Enc): |
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60
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def encode(self, d: bytes) -> str: |
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return base64.b16encode(d).decode(encoding="ascii") |
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63
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def decode(self, d: str) -> bytes: |
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return base64.b16decode(d) |
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class Base32(Enc): |
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68
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def encode(self, d: bytes) -> str: |
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return base64.b32encode(d).decode(encoding="ascii") |
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def decode(self, d: str) -> bytes: |
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return base64.b32decode(d) |
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74
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75
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class Base64(Enc): |
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def encode(self, d: bytes) -> str: |
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return base64.standard_b64encode(d).decode(encoding="ascii") |
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def decode(self, d: str) -> bytes: |
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return base64.standard_b64decode(d) |
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82
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83
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class Base64Url(Enc): |
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84
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def encode(self, d: bytes) -> str: |
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return base64.urlsafe_b64encode(d).decode(encoding="ascii") |
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def decode(self, d: str) -> bytes: |
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return base64.urlsafe_b64decode(d) |
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91
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class Base32Hex(Enc): |
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92
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def encode(self, d: bytes) -> str: |
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return base64.b32hexencode(d).decode(encoding="ascii") |
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def decode(self, d: str) -> bytes: |
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return base64.b32hexdecode(d) |
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class Base32HexTilde(Enc): |
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100
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def encode(self, d: bytes) -> str: |
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return base64.b32hexencode(d).decode(encoding="ascii").replace("=", "~") |
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102
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103
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def decode(self, d: str) -> bytes: |
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return base64.b32hexdecode(d.replace("=", "~")) |
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105
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106
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107
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class Base2048(Enc): |
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108
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def encode(self, d: bytes) -> str: |
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return base2048.encode(d).decode(encoding="ascii") |
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def decode(self, d: str) -> bytes: |
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return base2048.decode(d) |
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114
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115
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class _Alphabet32Enc(Enc): |
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_base32_alphabet = "" |
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_to_alphabet = "" |
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119
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def encode(self, d: bytes) -> str: |
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encoded = base64.b32encode(d).decode(encoding="ascii") |
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alphabet = dict(zip(self._base32_alphabet, self._to_alphabet)) |
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return "".join([alphabet[v] for v in encoded]) |
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124
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def decode(self, d: str) -> bytes: |
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alphabet = dict(zip(self._to_alphabet, self._base32_alphabet)) |
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d = "".join([alphabet[v] for v in d]) |
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return base64.b32hexdecode(d) |
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128
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129
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130
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class Base32Bech(_Alphabet32Enc): |
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_base32_alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567=" |
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_to_alphabet = "qpzry9x8gf2tvdw0s3jn54khce6mua7l=" |
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133
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134
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@property |
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def name(self) -> str: |
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return "base32-bech" |
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137
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138
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139
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class Base32BechTilde(_Alphabet32Enc): |
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140
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_base32_alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567=" |
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_to_alphabet = "qpzry9x8gf2tvdw0s3jn54khce6mua7l~" |
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142
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143
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@property |
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144
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def name(self) -> str: |
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return "base32-bech-tilde" |
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146
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147
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148
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class Base32HexBech(_Alphabet32Enc): |
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149
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_base32_alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUV=" |
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150
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_to_alphabet = "023456789acdefghjklmnpqrstuvwxyz=" |
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151
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152
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@property |
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153
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def name(self) -> str: |
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154
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return "base32hex-bech" |
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155
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156
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157
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class Base32HexBechTilde(_Alphabet32Enc): |
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158
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_base32_alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUV=" |
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159
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_to_alphabet = "023456789acdefghjklmnpqrstuvwxyz~" |
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160
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161
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@property |
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162
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def name(self) -> str: |
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return "base32hex-bech-tilde" |
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164
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165
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166
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class Base64UrlTilde(Enc): |
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167
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@property |
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168
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def name(self) -> str: |
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169
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return "base64url-tilde" |
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170
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171
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def encode(self, d: bytes) -> str: |
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return base64.urlsafe_b64encode(d).decode(encoding="ascii").replace("=", "~") |
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174
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def decode(self, d: str) -> bytes: |
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return base64.urlsafe_b64decode(d.replace("~", "=")) |
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176
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177
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178
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class Base85(Enc): |
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179
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def encode(self, d: bytes) -> str: |
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180
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return base64.b85encode(d).decode(encoding="ascii") |
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181
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182
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def decode(self, d: str) -> bytes: |
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183
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return base64.b85decode(d) |
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184
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185
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186
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ENCODINGS = { |
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187
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e.name: e |
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188
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for e in [ |
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189
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Base16, |
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190
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Base32, |
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191
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Base32Hex, |
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192
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Base32HexTilde, |
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Base32Bech, |
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194
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Base32HexBech, |
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Base32BechTilde, |
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196
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Base32HexBechTilde, |
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197
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Base64, |
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198
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Base64Url, |
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199
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Base64UrlTilde, |
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200
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Base85, |
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201
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Base2048, |
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202
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] |
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203
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} |
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204
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205
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206
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class IoTools: |
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207
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@classmethod |
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208
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def hash_digest( |
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209
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cls, |
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210
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data: SupportsBytes | str, |
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211
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algorithm: HashAlgorithm, |
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212
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*, |
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213
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digest_length: int | None = None, |
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214
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**kwargs, |
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215
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) -> bytes: |
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216
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kwargs = dict(usedforsecurity=False) | kwargs |
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217
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x = data.encode("utf-8") if isinstance(data, str) else bytes(data) |
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218
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if algorithm == "crc32": |
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219
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return bytes(binascii.crc32(x)) |
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220
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elif algorithm.startswith("shake_"): |
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221
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m = getattr(hashlib, algorithm)(**kwargs) |
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222
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m.update(x) |
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223
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return m.digest(128 if digest_length is None else digest_length) |
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224
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else: |
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225
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m = hashlib.new(algorithm, **kwargs) |
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226
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m.update(x) |
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227
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return m.digest() |
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228
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229
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@classmethod |
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230
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def encode(cls, d: bytes, to: Encoding = "base64"): |
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231
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if to not in ENCODINGS: |
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232
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raise ValueError(f"Unknown encoding {to}") |
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233
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return ENCODINGS[to].encode(d) |
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234
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235
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@classmethod |
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236
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def decode(cls, d: bytes, to: Encoding = "base64"): |
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237
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if to not in ENCODINGS: |
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238
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raise ValueError(f"Unknown encoding {to}") |
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239
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return ENCODINGS[to].decode(d) |
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240
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241
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242
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__all__ = ["IoTools"] |
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243
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