Mercurial Repositories > eric / file comparison
comparison: eric6/Utilities/crypto/py3PBKDF2.py
eric6/Utilities/crypto/py3PBKDF2.py
- changeset 6942
- 2602857055c5
- parent 6645
- ad476851d7e0
- child 7229
- 53054eb5b15a
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| 6941:f99d60d6b59b | 6942:2602857055c5 |
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| 1 # -*- coding: utf-8 -*- | |
| 2 | |
| 3 # Copyright (c) 2002 - 2019 Detlev Offenbach <detlev@die-offenbachs.de> | |
| 4 # | |
| 5 | |
| 6 """ | |
| 7 Module implementing PBKDF2 functions. | |
| 8 """ | |
| 9 | |
| 10 from __future__ import unicode_literals | |
| 11 | |
| 12 import hashlib | |
| 13 import hmac | |
| 14 import os | |
| 15 import base64 | |
| 16 | |
| 17 Hashes = { | |
| 18 "sha1": hashlib.sha1, | |
| 19 "sha224": hashlib.sha224, | |
| 20 "sha256": hashlib.sha256, | |
| 21 "sha384": hashlib.sha384, | |
| 22 "sha512": hashlib.sha512, | |
| 23 "md5": hashlib.md5, | |
| 24 } | |
| 25 | |
| 26 Delimiter = "$" | |
| 27 | |
| 28 | |
| 29 def pbkdf2(password, salt, iterations, digestMod): | |
| 30 """ | |
| 31 Module function to hash a password according to the PBKDF2 specification. | |
| 32 | |
| 33 @param password clear text password (bytes) | |
| 34 @param salt salt value (bytes) | |
| 35 @param iterations number of times hash function should be applied (integer) | |
| 36 @param digestMod hash function | |
| 37 @return hashed password (bytes) | |
| 38 """ | |
| 39 pwHash = password | |
| 40 for _ in range(iterations): | |
| 41 pwHash = hmac.new(salt, pwHash, digestMod).digest() | |
| 42 return pwHash | |
| 43 | |
| 44 | |
| 45 def hashPasswordTuple(password, digestMod=hashlib.sha512, iterations=10000, | |
| 46 saltSize=32): | |
| 47 """ | |
| 48 Module function to hash a password according to the PBKDF2 specification. | |
| 49 | |
| 50 @param password clear text password (string) | |
| 51 @param digestMod hash function | |
| 52 @param iterations number of times hash function should be applied (integer) | |
| 53 @param saltSize size of the salt (integer) | |
| 54 @return tuple of digestname (string), number of iterations (integer), | |
| 55 salt (bytes) and hashed password (bytes) | |
| 56 """ | |
| 57 salt = os.urandom(saltSize) | |
| 58 password = password.encode("utf-8") | |
| 59 pwHash = pbkdf2(password, salt, iterations, digestMod) | |
| 60 digestname = digestMod.__name__.replace("openssl_", "") | |
| 61 return digestname, iterations, salt, pwHash | |
| 62 | |
| 63 | |
| 64 def hashPassword(password, digestMod=hashlib.sha512, iterations=10000, | |
| 65 saltSize=32): | |
| 66 """ | |
| 67 Module function to hash a password according to the PBKDF2 specification. | |
| 68 | |
| 69 @param password clear text password (string) | |
| 70 @param digestMod hash function | |
| 71 @param iterations number of times hash function should be applied (integer) | |
| 72 @param saltSize size of the salt (integer) | |
| 73 @return hashed password entry according to PBKDF2 specification (string) | |
| 74 """ | |
| 75 digestname, iterations, salt, pwHash = \ | |
| 76 hashPasswordTuple(password, digestMod, iterations, saltSize) | |
| 77 return Delimiter.join([ | |
| 78 digestname, | |
| 79 str(iterations), | |
| 80 base64.b64encode(salt).decode("ascii"), | |
| 81 base64.b64encode(pwHash).decode("ascii") | |
| 82 ]) | |
| 83 | |
| 84 | |
| 85 def verifyPassword(password, pwHash): | |
| 86 """ | |
| 87 Module function to verify a password against a hash encoded password. | |
| 88 | |
| 89 @param password clear text password (string) | |
| 90 @param pwHash hash encoded password in the form | |
| 91 'digestmod$iterations$salt$hashed_password' as produced by the | |
| 92 hashPassword function (string) | |
| 93 @return flag indicating a successfull verification (boolean) | |
| 94 @exception ValueError the hash is not of the expected format or the | |
| 95 digest is not one of the known ones | |
| 96 """ | |
| 97 try: | |
| 98 digestname, iterations, salt, pwHash = pwHash.split(Delimiter) | |
| 99 except ValueError: | |
| 100 raise ValueError( | |
| 101 "Expected hash encoded password in format " | |
| 102 "'digestmod{0}iterations{0}salt{0}hashed_password" | |
| 103 .format(Delimiter)) | |
| 104 | |
| 105 if digestname not in Hashes.keys(): | |
| 106 raise ValueError( | |
| 107 "Unsupported hash algorithm '{0}' for hash encoded password '{1}'." | |
| 108 .format(digestname, pwHash)) | |
| 109 | |
| 110 iterations = int(iterations) | |
| 111 salt = base64.b64decode(salt.encode("ascii")) | |
| 112 pwHash = base64.b64decode(pwHash.encode("ascii")) | |
| 113 password = password.encode("utf-8") | |
| 114 return pwHash == pbkdf2(password, salt, iterations, Hashes[digestname]) | |
| 115 | |
| 116 | |
| 117 def rehashPassword(password, hashParameters): | |
| 118 """ | |
| 119 Module function to recreate a password hash given the hash parameters. | |
| 120 | |
| 121 @param password clear text password (string) | |
| 122 @param hashParameters hash parameters in the form | |
| 123 'digestmod$iterations$salt' (string) | |
| 124 @return hashed password (bytes) | |
| 125 @exception ValueError the hash parameters string is not of the expected | |
| 126 format or the digest is not one of the known ones | |
| 127 """ | |
| 128 try: | |
| 129 digestname, iterations, salt = hashParameters.split(Delimiter) | |
| 130 except ValueError: | |
| 131 raise ValueError( | |
| 132 "Expected hash parameters string in format " | |
| 133 "'digestmod{0}iterations{0}salt".format(Delimiter)) | |
| 134 | |
| 135 if digestname not in Hashes.keys(): | |
| 136 raise ValueError( | |
| 137 "Unsupported hash algorithm '{0}' for hash parameters '{1}'." | |
| 138 .format(digestname, hashParameters)) | |
| 139 | |
| 140 iterations = int(iterations) | |
| 141 salt = base64.b64decode(salt.encode("ascii")) | |
| 142 password = password.encode("utf-8") | |
| 143 return pbkdf2(password, salt, iterations, Hashes[digestname]) |
