/usr/share/tcltk/tcllib1.17/sha1/sha1v1.tcl is in tcllib 1.17-dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (C) 2001 Don Libes <libes@nist.gov>
# Copyright (C) 2003 Pat Thoyts <patthoyts@users.sourceforge.net>
#
# SHA1 defined by FIPS 180-1, "The SHA1 Message-Digest Algorithm"
# HMAC defined by RFC 2104, "Keyed-Hashing for Message Authentication"
#
# This is an implementation of SHA1 based upon the example code given in
# FIPS 180-1 and upon the tcllib MD4 implementation and taking some ideas
# and methods from the earlier tcllib sha1 version by Don Libes.
#
# This implementation permits incremental updating of the hash and
# provides support for external compiled implementations either using
# critcl (sha1c) or Trf.
#
# ref: http://www.itl.nist.gov/fipspubs/fip180-1.htm
#
# -------------------------------------------------------------------------
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
# -------------------------------------------------------------------------
# @mdgen EXCLUDE: sha1c.tcl
package require Tcl 8.2; # tcl minimum version
namespace eval ::sha1 {
variable accel
array set accel {critcl 0 cryptkit 0 trf 0}
namespace export sha1 hmac SHA1Init SHA1Update SHA1Final
variable uid
if {![info exists uid]} {
set uid 0
}
}
# -------------------------------------------------------------------------
# SHA1Init --
#
# Create and initialize an SHA1 state variable. This will be
# cleaned up when we call SHA1Final
#
proc ::sha1::SHA1Init {} {
variable accel
variable uid
set token [namespace current]::[incr uid]
upvar #0 $token state
# FIPS 180-1: 7 - Initialize the hash state
array set state \
[list \
A [expr {int(0x67452301)}] \
B [expr {int(0xEFCDAB89)}] \
C [expr {int(0x98BADCFE)}] \
D [expr {int(0x10325476)}] \
E [expr {int(0xC3D2E1F0)}] \
n 0 i "" ]
if {$accel(cryptkit)} {
cryptkit::cryptCreateContext state(ckctx) CRYPT_UNUSED CRYPT_ALGO_SHA
} elseif {$accel(trf)} {
set s {}
switch -exact -- $::tcl_platform(platform) {
windows { set s [open NUL w] }
unix { set s [open /dev/null w] }
}
if {$s != {}} {
fconfigure $s -translation binary -buffering none
::sha1 -attach $s -mode write \
-read-type variable \
-read-destination [subst $token](trfread) \
-write-type variable \
-write-destination [subst $token](trfwrite)
array set state [list trfread 0 trfwrite 0 trf $s]
}
}
return $token
}
# SHA1Update --
#
# This is called to add more data into the hash. You may call this
# as many times as you require. Note that passing in "ABC" is equivalent
# to passing these letters in as separate calls -- hence this proc
# permits hashing of chunked data
#
# If we have a C-based implementation available, then we will use
# it here in preference to the pure-Tcl implementation.
#
proc ::sha1::SHA1Update {token data} {
variable accel
upvar #0 $token state
if {$accel(critcl)} {
if {[info exists state(sha1c)]} {
set state(sha1c) [sha1c $data $state(sha1c)]
} else {
set state(sha1c) [sha1c $data]
}
return
} elseif {[info exists state(ckctx)]} {
if {[string length $data] > 0} {
cryptkit::cryptEncrypt $state(ckctx) $data
}
return
} elseif {[info exists state(trf)]} {
puts -nonewline $state(trf) $data
return
}
# Update the state values
incr state(n) [string length $data]
append state(i) $data
# Calculate the hash for any complete blocks
set len [string length $state(i)]
for {set n 0} {($n + 64) <= $len} {} {
SHA1Transform $token [string range $state(i) $n [incr n 64]]
}
# Adjust the state for the blocks completed.
set state(i) [string range $state(i) $n end]
return
}
# SHA1Final --
#
# This procedure is used to close the current hash and returns the
# hash data. Once this procedure has been called the hash context
# is freed and cannot be used again.
#
# Note that the output is 160 bits represented as binary data.
#
proc ::sha1::SHA1Final {token} {
upvar #0 $token state
# Check for either of the C-compiled versions.
if {[info exists state(sha1c)]} {
set r $state(sha1c)
unset state
return $r
} elseif {[info exists state(ckctx)]} {
cryptkit::cryptEncrypt $state(ckctx) ""
cryptkit::cryptGetAttributeString $state(ckctx) \
CRYPT_CTXINFO_HASHVALUE r 20
cryptkit::cryptDestroyContext $state(ckctx)
# If nothing was hashed, we get no r variable set!
if {[info exists r]} {
unset state
return $r
}
} elseif {[info exists state(trf)]} {
close $state(trf)
set r $state(trfwrite)
unset state
return $r
}
# Padding
#
set len [string length $state(i)]
set pad [expr {56 - ($len % 64)}]
if {$len % 64 > 56} {
incr pad 64
}
if {$pad == 0} {
incr pad 64
}
append state(i) [binary format a$pad \x80]
# Append length in bits as big-endian wide int.
set dlen [expr {8 * $state(n)}]
append state(i) [binary format II 0 $dlen]
# Calculate the hash for the remaining block.
set len [string length $state(i)]
for {set n 0} {($n + 64) <= $len} {} {
SHA1Transform $token [string range $state(i) $n [incr n 64]]
}
# Output
set r [bytes $state(A)][bytes $state(B)][bytes $state(C)][bytes $state(D)][bytes $state(E)]
unset state
return $r
}
# -------------------------------------------------------------------------
# HMAC Hashed Message Authentication (RFC 2104)
#
# hmac = H(K xor opad, H(K xor ipad, text))
#
# HMACInit --
#
# This is equivalent to the SHA1Init procedure except that a key is
# added into the algorithm
#
proc ::sha1::HMACInit {K} {
# Key K is adjusted to be 64 bytes long. If K is larger, then use
# the SHA1 digest of K and pad this instead.
set len [string length $K]
if {$len > 64} {
set tok [SHA1Init]
SHA1Update $tok $K
set K [SHA1Final $tok]
set len [string length $K]
}
set pad [expr {64 - $len}]
append K [string repeat \0 $pad]
# Cacluate the padding buffers.
set Ki {}
set Ko {}
binary scan $K i16 Ks
foreach k $Ks {
append Ki [binary format i [expr {$k ^ 0x36363636}]]
append Ko [binary format i [expr {$k ^ 0x5c5c5c5c}]]
}
set tok [SHA1Init]
SHA1Update $tok $Ki; # initialize with the inner pad
# preserve the Ko value for the final stage.
# FRINK: nocheck
set [subst $tok](Ko) $Ko
return $tok
}
# HMACUpdate --
#
# Identical to calling SHA1Update
#
proc ::sha1::HMACUpdate {token data} {
SHA1Update $token $data
return
}
# HMACFinal --
#
# This is equivalent to the SHA1Final procedure. The hash context is
# closed and the binary representation of the hash result is returned.
#
proc ::sha1::HMACFinal {token} {
upvar #0 $token state
set tok [SHA1Init]; # init the outer hashing function
SHA1Update $tok $state(Ko); # prepare with the outer pad.
SHA1Update $tok [SHA1Final $token]; # hash the inner result
return [SHA1Final $tok]
}
# -------------------------------------------------------------------------
# Description:
# This is the core SHA1 algorithm. It is a lot like the MD4 algorithm but
# includes an extra round and a set of constant modifiers throughout.
#
set ::sha1::SHA1Transform_body {
upvar #0 $token state
# FIPS 180-1: 7a: Process Message in 16-Word Blocks
binary scan $msg I* blocks
set blockLen [llength $blocks]
for {set i 0} {$i < $blockLen} {incr i 16} {
set W [lrange $blocks $i [expr {$i+15}]]
# FIPS 180-1: 7b: Expand the input into 80 words
# For t = 16 to 79
# let Wt = (Wt-3 ^ Wt-8 ^ Wt-14 ^ Wt-16) <<< 1
set t3 12
set t8 7
set t14 1
set t16 -1
for {set t 16} {$t < 80} {incr t} {
set x [expr {[lindex $W [incr t3]] ^ [lindex $W [incr t8]] ^ \
[lindex $W [incr t14]] ^ [lindex $W [incr t16]]}]
lappend W [expr {int(($x << 1) | (($x >> 31) & 1))}]
}
# FIPS 180-1: 7c: Copy hash state.
set A $state(A)
set B $state(B)
set C $state(C)
set D $state(D)
set E $state(E)
# FIPS 180-1: 7d: Do permutation rounds
# For t = 0 to 79 do
# TEMP = (A<<<5) + ft(B,C,D) + E + Wt + Kt;
# E = D; D = C; C = S30(B); B = A; A = TEMP;
# Round 1: ft(B,C,D) = (B & C) | (~B & D) ( 0 <= t <= 19)
for {set t 0} {$t < 20} {incr t} {
set TEMP [F1 $A $B $C $D $E [lindex $W $t]]
set E $D
set D $C
set C [rotl32 $B 30]
set B $A
set A $TEMP
}
# Round 2: ft(B,C,D) = (B ^ C ^ D) ( 20 <= t <= 39)
for {} {$t < 40} {incr t} {
set TEMP [F2 $A $B $C $D $E [lindex $W $t]]
set E $D
set D $C
set C [rotl32 $B 30]
set B $A
set A $TEMP
}
# Round 3: ft(B,C,D) = ((B & C) | (B & D) | (C & D)) ( 40 <= t <= 59)
for {} {$t < 60} {incr t} {
set TEMP [F3 $A $B $C $D $E [lindex $W $t]]
set E $D
set D $C
set C [rotl32 $B 30]
set B $A
set A $TEMP
}
# Round 4: ft(B,C,D) = (B ^ C ^ D) ( 60 <= t <= 79)
for {} {$t < 80} {incr t} {
set TEMP [F4 $A $B $C $D $E [lindex $W $t]]
set E $D
set D $C
set C [rotl32 $B 30]
set B $A
set A $TEMP
}
# Then perform the following additions. (That is, increment each
# of the four registers by the value it had before this block
# was started.)
incr state(A) $A
incr state(B) $B
incr state(C) $C
incr state(D) $D
incr state(E) $E
}
return
}
proc ::sha1::F1 {A B C D E W} {
expr {(((($A << 5) & 0xffffffff) | (($A >> 27) & 0x1f)) \
+ ($D ^ ($B & ($C ^ $D))) + $E + $W + 0x5a827999) & 0xffffffff}
}
proc ::sha1::F2 {A B C D E W} {
expr {(((($A << 5) & 0xffffffff) | (($A >> 27) & 0x1f)) \
+ ($B ^ $C ^ $D) + $E + $W + 0x6ed9eba1) & 0xffffffff}
}
proc ::sha1::F3 {A B C D E W} {
expr {(((($A << 5) & 0xffffffff)| (($A >> 27) & 0x1f)) \
+ (($B & $C) | ($D & ($B | $C))) + $E + $W + 0x8f1bbcdc) & 0xffffffff}
}
proc ::sha1::F4 {A B C D E W} {
expr {(((($A << 5) & 0xffffffff)| (($A >> 27) & 0x1f)) \
+ ($B ^ $C ^ $D) + $E + $W + 0xca62c1d6) & 0xffffffff}
}
proc ::sha1::rotl32 {v n} {
return [expr {((($v << $n) \
| (($v >> (32 - $n)) \
& (0x7FFFFFFF >> (31 - $n))))) \
& 0xFFFFFFFF}]
}
# -------------------------------------------------------------------------
#
# In order to get this code to go as fast as possible while leaving
# the main code readable we can substitute the above function bodies
# into the transform procedure. This inlines the code for us an avoids
# a procedure call overhead within the loops.
#
# We can do some minor tweaking to improve speed on Tcl < 8.5 where we
# know our arithmetic is limited to 64 bits. On > 8.5 we may have
# unconstrained integer arithmetic and must avoid letting it run away.
#
regsub -all -line \
{\[F1 \$A \$B \$C \$D \$E (\[.*?\])\]} \
$::sha1::SHA1Transform_body \
{[expr {(rotl32($A,5) + ($D ^ ($B \& ($C ^ $D))) + $E + \1 + 0x5a827999) \& 0xffffffff}]} \
::sha1::SHA1Transform_body_tmp
regsub -all -line \
{\[F2 \$A \$B \$C \$D \$E (\[.*?\])\]} \
$::sha1::SHA1Transform_body_tmp \
{[expr {(rotl32($A,5) + ($B ^ $C ^ $D) + $E + \1 + 0x6ed9eba1) \& 0xffffffff}]} \
::sha1::SHA1Transform_body_tmp
regsub -all -line \
{\[F3 \$A \$B \$C \$D \$E (\[.*?\])\]} \
$::sha1::SHA1Transform_body_tmp \
{[expr {(rotl32($A,5) + (($B \& $C) | ($D \& ($B | $C))) + $E + \1 + 0x8f1bbcdc) \& 0xffffffff}]} \
::sha1::SHA1Transform_body_tmp
regsub -all -line \
{\[F4 \$A \$B \$C \$D \$E (\[.*?\])\]} \
$::sha1::SHA1Transform_body_tmp \
{[expr {(rotl32($A,5) + ($B ^ $C ^ $D) + $E + \1 + 0xca62c1d6) \& 0xffffffff}]} \
::sha1::SHA1Transform_body_tmp
regsub -all -line \
{rotl32\(\$A,5\)} \
$::sha1::SHA1Transform_body_tmp \
{((($A << 5) \& 0xffffffff) | (($A >> 27) \& 0x1f))} \
::sha1::SHA1Transform_body_tmp
regsub -all -line \
{\[rotl32 \$B 30\]} \
$::sha1::SHA1Transform_body_tmp \
{[expr {int(($B << 30) | (($B >> 2) \& 0x3fffffff))}]} \
::sha1::SHA1Transform_body_tmp
#
# Version 2 avoids a few truncations to 32 bits in non-essential places.
#
regsub -all -line \
{\[F1 \$A \$B \$C \$D \$E (\[.*?\])\]} \
$::sha1::SHA1Transform_body \
{[expr {rotl32($A,5) + ($D ^ ($B \& ($C ^ $D))) + $E + \1 + 0x5a827999}]} \
::sha1::SHA1Transform_body_tmp2
regsub -all -line \
{\[F2 \$A \$B \$C \$D \$E (\[.*?\])\]} \
$::sha1::SHA1Transform_body_tmp2 \
{[expr {rotl32($A,5) + ($B ^ $C ^ $D) + $E + \1 + 0x6ed9eba1}]} \
::sha1::SHA1Transform_body_tmp2
regsub -all -line \
{\[F3 \$A \$B \$C \$D \$E (\[.*?\])\]} \
$::sha1::SHA1Transform_body_tmp2 \
{[expr {rotl32($A,5) + (($B \& $C) | ($D \& ($B | $C))) + $E + \1 + 0x8f1bbcdc}]} \
::sha1::SHA1Transform_body_tmp2
regsub -all -line \
{\[F4 \$A \$B \$C \$D \$E (\[.*?\])\]} \
$::sha1::SHA1Transform_body_tmp2 \
{[expr {rotl32($A,5) + ($B ^ $C ^ $D) + $E + \1 + 0xca62c1d6}]} \
::sha1::SHA1Transform_body_tmp2
regsub -all -line \
{rotl32\(\$A,5\)} \
$::sha1::SHA1Transform_body_tmp2 \
{(($A << 5) | (($A >> 27) \& 0x1f))} \
::sha1::SHA1Transform_body_tmp2
regsub -all -line \
{\[rotl32 \$B 30\]} \
$::sha1::SHA1Transform_body_tmp2 \
{[expr {($B << 30) | (($B >> 2) \& 0x3fffffff)}]} \
::sha1::SHA1Transform_body_tmp2
if {[package vsatisfies [package provide Tcl] 8.5]} {
proc ::sha1::SHA1Transform {token msg} $::sha1::SHA1Transform_body_tmp
} else {
proc ::sha1::SHA1Transform {token msg} $::sha1::SHA1Transform_body_tmp2
}
unset ::sha1::SHA1Transform_body_tmp
unset ::sha1::SHA1Transform_body_tmp2
# -------------------------------------------------------------------------
proc ::sha1::byte {n v} {expr {((0xFF << (8 * $n)) & $v) >> (8 * $n)}}
proc ::sha1::bytes {v} {
#format %c%c%c%c [byte 0 $v] [byte 1 $v] [byte 2 $v] [byte 3 $v]
format %c%c%c%c \
[expr {((0xFF000000 & $v) >> 24) & 0xFF}] \
[expr {(0xFF0000 & $v) >> 16}] \
[expr {(0xFF00 & $v) >> 8}] \
[expr {0xFF & $v}]
}
# -------------------------------------------------------------------------
proc ::sha1::Hex {data} {
binary scan $data H* result
return $result
}
# -------------------------------------------------------------------------
# LoadAccelerator --
#
# This package can make use of a number of compiled extensions to
# accelerate the digest computation. This procedure manages the
# use of these extensions within the package. During normal usage
# this should not be called, but the test package manipulates the
# list of enabled accelerators.
#
proc ::sha1::LoadAccelerator {name} {
variable accel
set r 0
switch -exact -- $name {
critcl {
if {![catch {package require tcllibc}]
|| ![catch {package require sha1c}]} {
set r [expr {[info command ::sha1::sha1c] != {}}]
}
}
cryptkit {
if {![catch {package require cryptkit}]} {
set r [expr {![catch {cryptkit::cryptInit}]}]
}
}
trf {
if {![catch {package require Trf}]} {
set r [expr {![catch {::sha1 aa} msg]}]
}
}
default {
return -code error "invalid accelerator package:\
must be one of [join [array names accel] {, }]"
}
}
set accel($name) $r
}
# -------------------------------------------------------------------------
# Description:
# Pop the nth element off a list. Used in options processing.
#
proc ::sha1::Pop {varname {nth 0}} {
upvar $varname args
set r [lindex $args $nth]
set args [lreplace $args $nth $nth]
return $r
}
# -------------------------------------------------------------------------
# fileevent handler for chunked file hashing.
#
proc ::sha1::Chunk {token channel {chunksize 4096}} {
upvar #0 $token state
if {[eof $channel]} {
fileevent $channel readable {}
set state(reading) 0
}
SHA1Update $token [read $channel $chunksize]
}
# -------------------------------------------------------------------------
proc ::sha1::sha1 {args} {
array set opts {-hex 0 -filename {} -channel {} -chunksize 4096}
if {[llength $args] == 1} {
set opts(-hex) 1
} else {
while {[string match -* [set option [lindex $args 0]]]} {
switch -glob -- $option {
-hex { set opts(-hex) 1 }
-bin { set opts(-hex) 0 }
-file* { set opts(-filename) [Pop args 1] }
-channel { set opts(-channel) [Pop args 1] }
-chunksize { set opts(-chunksize) [Pop args 1] }
default {
if {[llength $args] == 1} { break }
if {[string compare $option "--"] == 0} { Pop args; break }
set err [join [lsort [concat -bin [array names opts]]] ", "]
return -code error "bad option $option:\
must be one of $err"
}
}
Pop args
}
}
if {$opts(-filename) != {}} {
set opts(-channel) [open $opts(-filename) r]
fconfigure $opts(-channel) -translation binary
}
if {$opts(-channel) == {}} {
if {[llength $args] != 1} {
return -code error "wrong # args:\
should be \"sha1 ?-hex? -filename file | string\""
}
set tok [SHA1Init]
SHA1Update $tok [lindex $args 0]
set r [SHA1Final $tok]
} else {
set tok [SHA1Init]
# FRINK: nocheck
set [subst $tok](reading) 1
fileevent $opts(-channel) readable \
[list [namespace origin Chunk] \
$tok $opts(-channel) $opts(-chunksize)]
# FRINK: nocheck
vwait [subst $tok](reading)
set r [SHA1Final $tok]
# If we opened the channel - we should close it too.
if {$opts(-filename) != {}} {
close $opts(-channel)
}
}
if {$opts(-hex)} {
set r [Hex $r]
}
return $r
}
# -------------------------------------------------------------------------
proc ::sha1::hmac {args} {
array set opts {-hex 1 -filename {} -channel {} -chunksize 4096}
if {[llength $args] != 2} {
while {[string match -* [set option [lindex $args 0]]]} {
switch -glob -- $option {
-key { set opts(-key) [Pop args 1] }
-hex { set opts(-hex) 1 }
-bin { set opts(-hex) 0 }
-file* { set opts(-filename) [Pop args 1] }
-channel { set opts(-channel) [Pop args 1] }
-chunksize { set opts(-chunksize) [Pop args 1] }
default {
if {[llength $args] == 1} { break }
if {[string compare $option "--"] == 0} { Pop args; break }
set err [join [lsort [array names opts]] ", "]
return -code error "bad option $option:\
must be one of $err"
}
}
Pop args
}
}
if {[llength $args] == 2} {
set opts(-key) [Pop args]
}
if {![info exists opts(-key)]} {
return -code error "wrong # args:\
should be \"hmac ?-hex? -key key -filename file | string\""
}
if {$opts(-filename) != {}} {
set opts(-channel) [open $opts(-filename) r]
fconfigure $opts(-channel) -translation binary
}
if {$opts(-channel) == {}} {
if {[llength $args] != 1} {
return -code error "wrong # args:\
should be \"hmac ?-hex? -key key -filename file | string\""
}
set tok [HMACInit $opts(-key)]
HMACUpdate $tok [lindex $args 0]
set r [HMACFinal $tok]
} else {
set tok [HMACInit $opts(-key)]
# FRINK: nocheck
set [subst $tok](reading) 1
fileevent $opts(-channel) readable \
[list [namespace origin Chunk] \
$tok $opts(-channel) $opts(-chunksize)]
# FRINK: nocheck
vwait [subst $tok](reading)
set r [HMACFinal $tok]
# If we opened the channel - we should close it too.
if {$opts(-filename) != {}} {
close $opts(-channel)
}
}
if {$opts(-hex)} {
set r [Hex $r]
}
return $r
}
# -------------------------------------------------------------------------
# Try and load a compiled extension to help.
namespace eval ::sha1 {
variable e {}
foreach e {critcl cryptkit trf} { if {[LoadAccelerator $e]} { break } }
unset e
}
package provide sha1 1.1.1
# -------------------------------------------------------------------------
# Local Variables:
# mode: tcl
# indent-tabs-mode: nil
# End:
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