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# md5crypt.tcl - Copyright (C) 2003 Pat Thoyts <patthoyts@users.sourceforge.net>
#
# This file provides a pure tcl implementation of the BSD MD5 crypt algorithm.
# The implementation is based upon the OpenBSD code which is in turn based upon
# the original code by Poul-Henning Kamp.
#
# -------------------------------------------------------------------------
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
# -------------------------------------------------------------------------
package require Tcl 8.2; # tcl minimum version
package require md5 2; # tcllib 1.5
# Try and load a compiled extension to help.
if {[catch {package require tcllibc}]} {
catch {package require md5cryptc}
}
namespace eval md5crypt {
variable version 1.0.0
variable rcsid {$Id: md5crypt.tcl,v 1.3 2004/01/15 06:36:13 andreas_kupries Exp $}
variable itoa64 \
{./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz}
namespace import -force ::md5::MD5Init ::md5::MD5Update ::md5::MD5Final
namespace export md5crypt
}
proc ::md5crypt::to64_tcl {v n} {
variable itoa64
for {} {$n > 0} {incr n -1} {
set i [expr {$v & 0x3f}]
append s [string index $itoa64 $i]
set v [expr {($v >> 6) & 0x3FFFFFFF}]
}
return $s
}
proc ::md5crypt::md5crypt_tcl {magic pw salt} {
set sp 0
set start 0
if {[string match "${magic}*" $salt]} {
set start [string length $magic]
}
set end [string first $ $salt $start]
if {$end < 0} {set end [string length $salt]} else {incr end -1}
if {$end - $start > 7} {set end [expr {$start + 7}]}
set salt [string range $salt $start $end]
set ctx [MD5Init]
MD5Update $ctx $pw
MD5Update $ctx $magic
MD5Update $ctx $salt
set ctx2 [MD5Init]
MD5Update $ctx2 $pw
MD5Update $ctx2 $salt
MD5Update $ctx2 $pw
set H2 [MD5Final $ctx2]
for {set pl [string length $pw]} {$pl > 0} {incr pl -16} {
set tl [expr {($pl > 16 ? 16 : $pl) - 1}]
MD5Update $ctx [string range $H2 0 $tl]
}
for {set i [string length $pw]} {$i != 0} {set i [expr {$i >> 1}]} {
if {$i & 1} {
set c \0
} else {
set c [string index $pw 0]
}
MD5Update $ctx $c
}
set result "${magic}${salt}\$"
set H [MD5Final $ctx]
for {set i 0} {$i < 1000} {incr i} {
set ctx [MD5Init]
if {$i & 1} {
MD5Update $ctx $pw
} else {
MD5Update $ctx $H
}
if {$i % 3} {
MD5Update $ctx $salt
}
if {$i % 7} {
MD5Update $ctx $pw
}
if {$i & 1} {
MD5Update $ctx $H
} else {
MD5Update $ctx $pw
}
set H [MD5Final $ctx]
}
binary scan $H c* Vs
foreach v $Vs {lappend V [expr {$v & 0xFF}]}
set l [expr {([lindex $V 0] << 16) | ([lindex $V 6] << 8) | [lindex $V 12]}]
append result [to64 $l 4]
set l [expr {([lindex $V 1] << 16) | ([lindex $V 7] << 8) | [lindex $V 13]}]
append result [to64 $l 4]
set l [expr {([lindex $V 2] << 16) | ([lindex $V 8] << 8) | [lindex $V 14]}]
append result [to64 $l 4]
set l [expr {([lindex $V 3] << 16) | ([lindex $V 9] << 8) | [lindex $V 15]}]
append result [to64 $l 4]
set l [expr {([lindex $V 4] << 16) | ([lindex $V 10] << 8) | [lindex $V 5]}]
append result [to64 $l 4]
set l [expr {[lindex $V 11]}]
append result [to64 $l 2]
return $result
}
if {[info command ::md5crypt::to64_c] == {}} {
interp alias {} ::md5crypt::to64 {} ::md5crypt::to64_tcl
} else {
interp alias {} ::md5crypt::to64 {} ::md5crypt::to64_c
}
if {[info command ::md5crypt::md5crypt_c] == {}} {
interp alias {} ::md5crypt::md5crypt {} ::md5crypt::md5crypt_tcl {$1$}
interp alias {} ::md5crypt::aprcrypt {} ::md5crypt::md5crypt_tcl {$apr1$}
} else {
interp alias {} ::md5crypt::md5crypt {} ::md5crypt::md5crypt_c {$1$}
interp alias {} ::md5crypt::aprcrypt {} ::md5crypt::md5crypt_c {$apr1$}
}
# -------------------------------------------------------------------------
package provide md5crypt $::md5crypt::version
# -------------------------------------------------------------------------
# Local Variables:
# mode: tcl
# indent-tabs-mode: nil
# End:
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