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md5 hash is not recognized

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Occasional Contributor

md5 hash is not recognized


I installed sudo on my hp server. The OS version is 11v3.
The passwords are crypt with bsdmd5 algorithm instead of standard des in /etc/shadow file. I can easily log in to the system via ssh using that passwords. Then I decided to install sudo command as it is not installed by default (ixSudo A.14.00-1.7.2). Now the problem is that users are getting the password incorrect message when trying to type their passwords after invoking the command "sudo su -".

for user whom password is in des format in /etc/shadow the "sudo su -" command works like a house on a fire.

thanks in advance
Steven E. Protter
Exalted Contributor

Re: md5 hash is not recognized


Take a look at the sudoers file, the configuration for sudo.

There is also an md5 add in depot on that might help, though I thought this was part of the 11.31 base install.

What I think is probably happening is something incorrect in the basic sudo configuration for these users.

Steven E Protter
Owner of ISN Corporation
Honored Contributor

Re: md5 hash is not recognized

As far as I know, HP-UX does not support the bsdmd5 password hashing algorithm. Sad but true.

Your SSH probably has a built-in support for bsdmd5-hashed passwords, and you've configured your sshd to directly read the /etc/passwd and /etc/shadow instead of using the system's PAM libraries.

(HP SSH is a port of OpenSSH, whose "native" OS platform is OpenBSD... so the built-in BSDmd5 support is no surprise there.)

The only md5 depot on I know of is the "md5sum" tool, which only allows verifying the integrity of files using md5sums. It is not at all related to /etc/shadow and passwords. The depot also supplies the libcryptx library, to allow other programs to use the md5 algorithm... but no PAM libraries to make use of the algorithm in password hashing.

There is a depot called LongPassword available for HP-UX 11iv3 on It adds the support for SHA512-hashed passwords. The algorithm identifier in the beginning of the hashed password strings will be "$6$".

So, up to and including HP-UX 11iv2, the only supported password hashing algorithms were the traditional DES-based Unix "crypt", and the HP-proprietary "bigcrypt" used in Trusted System Mode when the password length was increased beyond 8 characters.

In 11.31 there is now an option to use SHA512... if an additional package is installed. I hope this means other algorithms might be added in the future.

Occasional Contributor

Re: md5 hash is not recognized

Thanks a lot for quick responses.
So I decided to use SHA512 as HP-UX 11v3 does not support bsdmd5.