Utilities/crypto/py3PBKDF2.py

Sun, 19 Jun 2011 15:19:46 +0200

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Sun, 19 Jun 2011 15:19:46 +0200
changeset 1127
b1802ebe0066
child 1130
3e9f0330f833
permissions
-rw-r--r--

Added capability to encrypt saved passwords with a master password and rearranged some configuration parameters related to security.

1127
b1802ebe0066 Added capability to encrypt saved passwords with a master password and rearranged some configuration parameters related to security.
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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2002 - 2011 Detlev Offenbach <detlev@die-offenbachs.de>
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4 #
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5
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6 """
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7 Module implementing PBKDF2 functions.
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8 """
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9
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10 import hashlib
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11 import hmac
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12 import os
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13 import base64
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14
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15 Hashes = {
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16 "sha1": hashlib.sha1,
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17 "sha224": hashlib.sha224,
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18 "sha256": hashlib.sha256,
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19 "sha384": hashlib.sha384,
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20 "sha512": hashlib.sha512,
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21 "md5": hashlib.md5,
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22 }
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23
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24 Delimiter = "$"
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25
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26 def pbkdf2(password, salt, iterations, digestMod):
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27 """
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28 Module function to hash a password according to the PBKDF2 specification.
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29
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30 @param password clear text password (bytes)
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31 @param salt salt value (bytes)
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32 @param iterations number of times hash function should be applied (integer)
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33 @param digestMod hash function
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34 @return hashed password (bytes)
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35 """
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36 hash = password
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37 for i in range(iterations):
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38 hash = hmac.new(salt, hash, digestMod).digest()
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39 return hash
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40
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41
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42 def hashPasswordTuple(password, digestMod=hashlib.sha512, iterations=10000, saltSize=32):
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43 """
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44 Module function to hash a password according to the PBKDF2 specification.
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45
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46 @param password clear text password (string)
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47 @param digestMod hash function
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48 @param iterations number of times hash function should be applied (integer)
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49 @param saltSize size of the salt (integer)
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50 @return tuple of digestname (string), number of iterations (integer),
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51 salt (bytes) and hashed password (bytes)
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52 """
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53 salt = os.urandom(saltSize)
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54 password = password.encode("utf-8")
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55 hash = pbkdf2(password, salt, iterations, digestMod)
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56 digestname = digestMod.__name__.replace("openssl_", "")
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57 return digestname, iterations, salt, hash
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58
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59
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60 def hashPassword(password, digestMod=hashlib.sha512, iterations=10000, saltSize=32):
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61 """
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62 Module function to hash a password according to the PBKDF2 specification.
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63
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64 @param password clear text password (string)
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65 @param digestMod hash function
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66 @param iterations number of times hash function should be applied (integer)
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67 @param saltSize size of the salt (integer)
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68 @return hashed password entry according to PBKDF2 specification (string)
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69 """
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70 digestname, iterations, salt, hash = \
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71 hashPasswordTuple(password, digestMod, iterations, saltSize)
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72 return Delimiter.join([
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73 digestname,
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74 str(iterations),
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75 base64.b64encode(salt).decode("ascii"),
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76 base64.b64encode(hash).decode("ascii")
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77 ])
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78
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79
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80 def verifyPassword(password, hash):
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81 """
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82 Module function to verify a password against a hash encoded password.
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83
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84 @param password clear text password (string)
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85 @param hash hash encoded password in the form
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86 'digestmod$iterations$salt$hashed_password' as produced by the
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87 hashPassword function (string)
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88 @return flag indicating a successfull verification (boolean)
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89 @exception ValueError the hash is not of the expected format or the
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90 digest is not one of the known ones
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91 """
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92 try:
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93 digestname, iterations, salt, pwHash = hash.split(Delimiter)
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94 except ValueError:
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95 raise ValueError(
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96 "Expected hash encoded password in format "\
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97 "'digestmod{0}iterations{0}salt{0}hashed_password".format(Delimiter))
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98
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99 if digestname not in Hashes.keys():
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100 raise ValueError(
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101 "Unsupported hash algorithm '{0}' for hash encoded password '{1}'.".format(
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102 digestname, hash))
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103
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104 iterations = int(iterations)
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105 salt = base64.b64decode(salt.encode("ascii"))
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106 pwHash = base64.b64decode(pwHash.encode("ascii"))
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107 password = password.encode("utf-8")
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108 return pwHash == pbkdf2(password, salt, iterations, Hashes[digestname])
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109
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110
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111 def rehashPassword(password, hashParameters):
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112 """
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113 Module function to recreate a password hash given the hash parameters.
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114
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115 @param password clear text password (string)
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116 @param hashParameters hash parameters in the form
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117 'digestmod$iterations$salt' (string)
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118 @return hashed password (bytes)
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119 @exception ValueError the hash parameters string is not of the expected format
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120 or the digest is not one of the known ones
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121 """
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122 try:
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123 digestname, iterations, salt = hashParameters.split(Delimiter)
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124 except ValueError:
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125 raise ValueError(
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126 "Expected hash parameters string in format "\
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127 "'digestmod{0}iterations{0}salt".format(Delimiter))
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128
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129 if digestname not in Hashes.keys():
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130 raise ValueError(
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131 "Unsupported hash algorithm '{0}' for hash parameters '{1}'.".format(
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132 digestname, hash))
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133
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134 iterations = int(iterations)
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135 salt = base64.b64decode(salt.encode("ascii"))
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136 password = password.encode("utf-8")
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137 return pbkdf2(password, salt, iterations, Hashes[digestname])
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138
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139
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140 if __name__ == "__main__":
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141 import sys
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142 pw = "secret_password"
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143 print(len(hashPasswordTuple(pw)[-1]))
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144 pwHash = hashPassword(pw)
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145 print(pwHash)
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146 print(verifyPassword(pw, pwHash))
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147 sys.exit(0)

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