Pbkdf2_sha256加密

Question

大家好，所以我正在弄清楚Pbkdf2_sha256是如何工作的。

以下是我目前正在研究的一些破译散列

PBKDF2 pbkdf2_sha256$10000$005OtPxTXhPq$K/2GplWPJsBVj+qbgdKW8YEteQyUkIiquT5MaOhPo4Y=:harry
PBKDF2 pbkdf2_sha256$10000$00Qhibr5Mbeg$l9grYueDrl3qN3NA7e9j5PodgV1XkGTz0Z6ajhF99AY=:radio
PBKDF2 pbkdf2_sha256$10000$00h7h0g1ZKE1$YEobSm/y+cFg/VXhU4gGYJ6eOkZ68jhJ5axDu68Dack=:momo
PBKDF2 pbkdf2_sha256$10000$01JMkfGk1RXh$vD+GGZshw5kExtZOpl5+Lht3xECULdbNVOesoTicxto=:fred
PBKDF2 pbkdf2_sha256$10000$01vkw1viCg4J$2hjlbq10Jh/Su3yqjKfYCnCSt1WlKcKJtsqDET618M0=:get
PBKDF2 pbkdf2_sha256$10000$01wayF5JLVSZ$2/9COWqb6SZG/raqabtU8fNBzkrt2puN7SaKw0U7jBs=:987456321

这是我计算散列的代码和输出

>>> from passlib.hash import pbkdf2_sha256
>>> from passlib.utils.binary import ab64_decode
>>> print(pbkdf2_sha256.hash("harry", rounds=10000, salt=ab64_decode(b'005OtPxTXhPq')))
$pbkdf2-sha256$10000$005OtPxTXhPq$l9LhRMPBW.EEdlBE9b.P0Z70Kxidl9EJhfGK7FiLUHA

比较这两种情况，你就会看到不同之处。

$pbkdf2_sha256$10000$005OtPxTXhPq$K/2GplWPJsBVj+qbgdKW8YEteQyUkIiquT5MaOhPo4Y=
$pbkdf2-sha256$10000$005OtPxTXhPq$l9LhRMPBW.EEdlBE9b.P0Z70Kxidl9EJhfGK7FiLUHA

有人能解释一下是什么原因造成的吗?如何计算正确的散列？

提前感谢！

Answer 1

正如注释中已经提到的，发布的数据有一种与passlib不同的格式:passlib格式解释为这里。Salt和hash (校验和)是Base64编码的。使用了一个特殊的Base64变量，解释了这里：填充(=)和空白被省略，.被应用于+。

另一方面，发布的数据的哈希是标准的Base64编码(即用+而不是.)和填充(=)。，而且盐被UTF8解码。。

如果考虑到这一点，盐和散列是相同的。下面的代码从发布的数据中确定passlib数据，并比较salt和hash，其中posted数据的salt和hash以passlib格式显示(即使用passlib Base64变量和Base64编码的salt)：

from passlib.hash import pbkdf2_sha256
from base64 import b64decode
from passlib.utils.binary import ab64_encode

def hashAndCompare(crackedHash):
    
    crackedChain = crackedHash.split('$')   
    #crackedChainDigest = crackedChain[0]
    crackedChainRounds = crackedChain[1]
    crackedChainSalt = crackedChain[2]
    crackedChainSaltPasslibFormat = ab64_encode(crackedChainSalt.encode('utf8')).decode('utf8')
    crackedChainHashData = crackedChain[3].split(':')
    crackedChainHash = crackedChainHashData[0]
    crackedChainHashPasslibFormat = ab64_encode(b64decode(crackedChainHash)).decode('utf8')
    crackedChainData = crackedChainHashData[1]
    
    passlibHash = pbkdf2_sha256.hash(crackedChainData, rounds=crackedChainRounds, salt=crackedChainSalt.encode('utf8')) 
    passlibChain = passlibHash.split('$')
    passlibChainSalt = passlibChain[3]
    passlibChainHash = passlibChain[4]
    
    print('Passlib: Hash: {0} Salt: {1}\nCracked: Hash: {2} Salt: {3}\n'.format(passlibChainHash, passlibChainSalt, crackedChainHashPasslibFormat, crackedChainSaltPasslibFormat))

hashAndCompare('pbkdf2_sha256$10000$005OtPxTXhPq$K/2GplWPJsBVj+qbgdKW8YEteQyUkIiquT5MaOhPo4Y=:harry')
hashAndCompare('pbkdf2_sha256$10000$00Qhibr5Mbeg$l9grYueDrl3qN3NA7e9j5PodgV1XkGTz0Z6ajhF99AY=:radio')
hashAndCompare('pbkdf2_sha256$10000$00h7h0g1ZKE1$YEobSm/y+cFg/VXhU4gGYJ6eOkZ68jhJ5axDu68Dack=:momo')
hashAndCompare('pbkdf2_sha256$10000$01JMkfGk1RXh$vD+GGZshw5kExtZOpl5+Lht3xECULdbNVOesoTicxto=:fred')
hashAndCompare('pbkdf2_sha256$10000$01vkw1viCg4J$2hjlbq10Jh/Su3yqjKfYCnCSt1WlKcKJtsqDET618M0=:get')
hashAndCompare('pbkdf2_sha256$10000$01wayF5JLVSZ$2/9COWqb6SZG/raqabtU8fNBzkrt2puN7SaKw0U7jBs=:987456321')

盐类和散列与一致的编码相同：

Passlib: Hash: K/2GplWPJsBVj.qbgdKW8YEteQyUkIiquT5MaOhPo4Y Salt: MDA1T3RQeFRYaFBx
Cracked: Hash: K/2GplWPJsBVj.qbgdKW8YEteQyUkIiquT5MaOhPo4Y Salt: MDA1T3RQeFRYaFBx

Passlib: Hash: l9grYueDrl3qN3NA7e9j5PodgV1XkGTz0Z6ajhF99AY Salt: MDBRaGlicjVNYmVn
Cracked: Hash: l9grYueDrl3qN3NA7e9j5PodgV1XkGTz0Z6ajhF99AY Salt: MDBRaGlicjVNYmVn

Passlib: Hash: YEobSm/y.cFg/VXhU4gGYJ6eOkZ68jhJ5axDu68Dack Salt: MDBoN2gwZzFaS0Ux
Cracked: Hash: YEobSm/y.cFg/VXhU4gGYJ6eOkZ68jhJ5axDu68Dack Salt: MDBoN2gwZzFaS0Ux

Passlib: Hash: vD.GGZshw5kExtZOpl5.Lht3xECULdbNVOesoTicxto Salt: MDFKTWtmR2sxUlho
Cracked: Hash: vD.GGZshw5kExtZOpl5.Lht3xECULdbNVOesoTicxto Salt: MDFKTWtmR2sxUlho

Passlib: Hash: 2hjlbq10Jh/Su3yqjKfYCnCSt1WlKcKJtsqDET618M0 Salt: MDF2a3cxdmlDZzRK
Cracked: Hash: 2hjlbq10Jh/Su3yqjKfYCnCSt1WlKcKJtsqDET618M0 Salt: MDF2a3cxdmlDZzRK

Passlib: Hash: 2/9COWqb6SZG/raqabtU8fNBzkrt2puN7SaKw0U7jBs Salt: MDF3YXlGNUpMVlNa
Cracked: Hash: 2/9COWqb6SZG/raqabtU8fNBzkrt2puN7SaKw0U7jBs Salt: MDF3YXlGNUpMVlNa

Answer 2

Django和passlib对该格式使用该格式：Django 1.4散列。

因此，我在python的shell中这样做了：

>>> from passlib.hash import django_pbkdf2_sha256
>>> secret = 'harry'
>>> hash = 'pbkdf2_sha256$10000$005OtPxTXhPq$K/2GplWPJsBVj+qbgdKW8YEteQyUkIiquT5MaOhPo4Y='
>>> django_pbkdf2_sha256.verify(secret, hash)
True
>>> rounds = hash.split('$')[1]
>>> salt = hash.split('$')[2]
>>> django_pbkdf2_sha256.hash(secret, rounds=rounds, salt=salt) == hash
True