crypt(3) $6$ password hash algorithm (based on SHA-512) in Java?

java shadow sha crypt sha512
lathspell42 picture lathspell42 · Jan 30, 2012 · Viewed 27.7k times · Source

I'm looking for a Java function to generate/verify password hashes that were encoded in the way crypt(3) does when storing them in the Linux "/etc/shadow" file if sha512 is activated in "/etc/pam.d/common-password".

The plaintext string "geheim" will translate to:

"$6$WoC532HB$LagBJ00vAGNGu8p9oeYDOSNZo9vTNTzOgPA.K0bJoiXfbcpj3jBuTkNwdzCrSNadRi8LanH1tH6tGGPPp/Lp3."

From http://www.akkadia.org/drepper/SHA-crypt.txt I understand that, like with MD5, it's not just a SHA hash like DigestUtils or the Java MessageDigest classes produce but an algorithm that does a bit more magic.

Answer

lathspell42 picture lathspell42 · Feb 8, 2012

I found Java implementations for all the new crypt() algorithms here: ftp://ftp.arlut.utexas.edu/java_hashes/

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