md5crypt(n) 1.0.0 "md5crypt"

Name

md5crypt - MD5-based password encryption

Table Of Contents
Synopsis
Description
COMMANDS
SALT
EXAMPLES
See Also
Keywords
Copyright

Synopsis

package require Tcl 8.2
package require md5 2.0
package require md5crypt ?1.0.0?

::md5crypt::md5crypt password salt
::md5crypt::aprcrypt password salt

This package provides an implementation of the MD5-crypt password encryption algorithm as pioneered by FreeBSD and currently in use as a replacement for the unix crypt(3) function in many modern systems. An implementation of the closely related Apache MD5-crypt is also available. The output of these commands are compatible with the BSD and OpenSSL implementation of md5crypt and the Apache 2 htpasswd program.

COMMANDS

::md5crypt::md5crypt password salt: Generate a BSD compatible md5-encoded password hash from the plaintext password and a random salt (see SALT).
::md5crypt::aprcrypt password salt: Generate an Apache compatible md5-encoded password hash from the plaintext password and a random salt (see SALT).

SALT

The salt passed to either of the encryption schemes implemented here is checked to see if it begins with the encryption scheme magic string (either "$1$" for MD5-crypt or "$apr1$" for Apache crypt). If so, this is removed. The remaining characters up to the next $ and up to a maximum of 8 characters are then used as the salt. The salt text should probably be restricted the set of ASCII alphanumeric characters plus "./" (dot and forward-slash) - this is to preserve maximum compatability with the unix password file format.

EXAMPLES

% md5crypt::md5crypt password 01234567
$1$01234567$b5lh2mHyD2PdJjFfALlEz1

% md5crypt::aprcrypt password 01234567
$apr1$01234567$IXBaQywhAhc0d75ZbaSDp/

Keywords

hashing, md5, md5crypt, message-digest, security