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Operating Systems Linux Red Hat How the Password Encryption Works in RHEL 6.4? Post 302790657 by fpmurphy on Saturday 6th of April 2013 07:46:15 AM
Old 04-06-2013
Look at the format of the password field in /etc/shadow. You should see something like $x$salt$hash where x denotes the algorithm used and x is one of the following values

1 = MD5, 2a = Blowfish, 5 = SHA256, 6 = SHA512

Look at the crypt(3) manpage for more information.
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passwd(1openssl)						      OpenSSL							  passwd(1openssl)

NAME
passwd - compute password hashes SYNOPSIS
openssl passwd [-crypt] [-1] [-apr1] [-salt string] [-in file] [-stdin] [-noverify] [-quiet] [-table] {password} DESCRIPTION
The passwd command computes the hash of a password typed at run-time or the hash of each password in a list. The password list is taken from the named file for option -in file, from stdin for option -stdin, or from the command line, or from the terminal otherwise. The Unix standard algorithm crypt and the MD5-based BSD password algorithm 1 and its Apache variant apr1 are available. OPTIONS
-crypt Use the crypt algorithm (default). -1 Use the MD5 based BSD password algorithm 1. -apr1 Use the apr1 algorithm (Apache variant of the BSD algorithm). -salt string Use the specified salt. When reading a password from the terminal, this implies -noverify. -in file Read passwords from file. -stdin Read passwords from stdin. -noverify Don't verify when reading a password from the terminal. -quiet Don't output warnings when passwords given at the command line are truncated. -table In the output list, prepend the cleartext password and a TAB character to each password hash. EXAMPLES
openssl passwd -crypt -salt xx password prints xxj31ZMTZzkVA. openssl passwd -1 -salt xxxxxxxx password prints $1$xxxxxxxx$UYCIxa628.9qXjpQCjM4a.. openssl passwd -apr1 -salt xxxxxxxx password prints $apr1$xxxxxxxx$dxHfLAsjHkDRmG83UXe8K0. OpenSSL-0.9.8 Oct 11 2005 passwd(1openssl)
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