LDAP password hash matching in Java

Question

I have this kind of password hashes in my LDAP database:

userPassword:: MTIzYVBkLSY=

I'm also caching the users password hash in my application so it is not needed to enter it every time. Given this, I want to check if a DN exists with the specified password. What kind of hash algorithm is this? Can I produce the same type of hash in Java?

Robert · Accepted Answer · 2012-07-09 09:10:52Z

3

That is not a password hash, that seems to be the password, encoded in Base64 format.

If you decode the posted string the you get the password 123aPd-&.

answered Jul 9, 2012 at 9:10

Robert

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juergen d · Accepted Answer · 2012-07-09 09:08:51Z

2

That is base64 encoding. try it here

answered Jul 9, 2012 at 9:08

juergen d

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This does not answer the question. He wants to know the hashing. Since the hash is very short, this cannot be a hash. Not even MD5.
– Michael-O
Commented Jul 9, 2012 at 9:10
Actually it did answer my question, I just found the attributeType in the schema file, and it is defined as an OctetString.
– Daniel Szalay
Commented Jul 9, 2012 at 9:12
1

An OctetString is not a concrete data definition. It just means that it can contain any transparent 8-bit bytes. Hence it contains any binary data.
– Robert
Commented Jul 9, 2012 at 9:19

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user207421 · Accepted Answer · 2012-07-09 09:57:30Z

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I want to check if a DN exists with the specified password.

The way to do that is to perform an LDAP bind with that DN and password as the credentials. In JNDI this is done via LdapContext.reconnect().

What kind of hash algorithm is this?

It doesn't matter, you don't need to know.

answered Jul 9, 2012 at 9:57

user207421

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