willdye 'Dunno why this old man page is in the Tcl Wiki, but if you're looking for a way to perform the crypt function in Tcl, then the link you want is probably "crypt in pure tcl", at: http://wiki.tcl.tk/1070
JMN 2005-08-31 The "crypt in pure tcl" above is packaged as 'tclcrypt' in the TclHttpd distribution.
In the non-starkit TclHttpd distribution, there is also the much faster binary version packaged as 'crypt'.
These are also available separately here: http://vectorstream.com/tcl/packages/
The trf package also provides the crypt function, but apparently not on the Windows platform at least.
While on the general subject - beware that at least one crypt implementation (crypt.exe in Cygwin on Windows) takes its 'password & salt' arguments in the reverse order to that of the Tcl implementations mentioned above.
The man page below appears to be from a different unix crypt function - i.e not the one commonly used for encrypting passwords for HTTP.
User Commands crypt(1)
NAME
crypt - encode or decode a file
SYNOPSIS
crypt [ password ]
DESCRIPTION
crypt encrypts and decrypts the contents of a file. crypt reads from the standard input and writes on the standard output. The password is a key that selects a particular transformation. If no password is given, crypt demands a key from the terminal and turns off printing while the key is being typed in. crypt encrypts and decrypts with the same key: example% crypt key<clear.file> encrypted.file example% crypt key<encrypted.file | pr will print the contents of clear.file. Files encrypted by crypt are compatible with those treated by the editors ed(1), ex(1), and vi(1) in encryption mode. The security of encrypted files depends on three factors: the fundamental method must be hard to solve; direct search of the key space must be infeasible; "sneak paths" by which keys or cleartext can become visible must be minimized. crypt implements a one-rotor machine designed along the lines of the German Enigma, but with a 256-element rotor. Methods of attack on such machines are widely known, thus crypt provides minimal security. The transformation of a key into the internal settings of the machine is deliberately designed to be expensive, that is, to take a substantial fraction of a second to compute. However, if keys are restricted to (say) three lower-case letters, then encrypted files can be read by expending only a substantial fraction of five minutes of machine time. Since the key is an argument to the crypt command, it is potentially visible to users executing ps(1) or a derivative command. To minimize this possibility, crypt takes care to destroy any record of the key immediately upon entry. No doubt the choice of keys and key security are the most vulnerable aspect of crypt.
FILES
/dev/tty for typed key
SunOS 5.8 Last change: 14 May 1997 1
User Commands crypt(1)
ATTRIBUTES
See attributes(5) for descriptions of the following attri- butes: ____________________________________________________________ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |_____________________________|_____________________________| | Availability | SUNWcsu | |_____________________________|_____________________________|
SEE ALSO
ed(1), ex(1), ps(1), vi(1), attributes (5)
SunOS 5.8 Last change: 14 May 1997 2