--- /dev/null
+
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+
--- /dev/null
+ GNU LESSER GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
+
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--- /dev/null
+# sha256.tcl - Copyright (C) 2005 Pat Thoyts <patthoyts@users.sourceforge.net>
+#
+# SHA1 defined by FIPS 180-2, "The Secure Hash Standard"
+# HMAC defined by RFC 2104, "Keyed-Hashing for Message Authentication"
+#
+# This is an implementation of the secure hash algorithms specified in the
+# FIPS 180-2 document.
+#
+# This implementation permits incremental updating of the hash and
+# provides support for external compiled implementations using critcl.
+#
+# This implementation permits incremental updating of the hash and
+# provides support for external compiled implementations either using
+# critcl (sha256c).
+#
+# Ref: http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
+# http://csrc.nist.gov/publications/fips/fips180-2/fips180-2withchangenotice.pdf
+#
+# -------------------------------------------------------------------------
+# See the file "license.terms" for information on usage and redistribution
+# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+# -------------------------------------------------------------------------
+#
+
+# @mdgen EXCLUDE: sha256c.tcl
+
+package require Tcl 8.2; # tcl minimum version
+
+namespace eval ::sha2 {
+ variable version 1.0.3
+ variable rcsid {$Id: sha256.tcl,v 1.7 2010/07/06 20:16:39 andreas_kupries Exp $}
+
+ variable accel
+ array set accel {tcl 0 critcl 0}
+ variable loaded {}
+
+ namespace export sha256 hmac \
+ SHA256Init SHA256Update SHA256Final
+
+ variable uid
+ if {![info exists uid]} {
+ set uid 0
+ }
+
+ variable K
+ if {![info exists K]} {
+ # FIPS 180-2: 4.2.2 SHA-256 constants
+ set K [list \
+ 0x428a2f98 0x71374491 0xb5c0fbcf 0xe9b5dba5 \
+ 0x3956c25b 0x59f111f1 0x923f82a4 0xab1c5ed5 \
+ 0xd807aa98 0x12835b01 0x243185be 0x550c7dc3 \
+ 0x72be5d74 0x80deb1fe 0x9bdc06a7 0xc19bf174 \
+ 0xe49b69c1 0xefbe4786 0x0fc19dc6 0x240ca1cc \
+ 0x2de92c6f 0x4a7484aa 0x5cb0a9dc 0x76f988da \
+ 0x983e5152 0xa831c66d 0xb00327c8 0xbf597fc7 \
+ 0xc6e00bf3 0xd5a79147 0x06ca6351 0x14292967 \
+ 0x27b70a85 0x2e1b2138 0x4d2c6dfc 0x53380d13 \
+ 0x650a7354 0x766a0abb 0x81c2c92e 0x92722c85 \
+ 0xa2bfe8a1 0xa81a664b 0xc24b8b70 0xc76c51a3 \
+ 0xd192e819 0xd6990624 0xf40e3585 0x106aa070 \
+ 0x19a4c116 0x1e376c08 0x2748774c 0x34b0bcb5 \
+ 0x391c0cb3 0x4ed8aa4a 0x5b9cca4f 0x682e6ff3 \
+ 0x748f82ee 0x78a5636f 0x84c87814 0x8cc70208 \
+ 0x90befffa 0xa4506ceb 0xbef9a3f7 0xc67178f2 \
+ ]
+ }
+
+}
+
+# -------------------------------------------------------------------------
+# Management of sha256 implementations.
+
+# 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 ::sha2::LoadAccelerator {name} {
+ variable accel
+ set r 0
+ switch -exact -- $name {
+ tcl {
+ # Already present (this file)
+ set r 1
+ }
+ critcl {
+ if {![catch {package require tcllibc}]
+ || ![catch {package require sha256c}]} {
+ set r [expr {[info command ::sha2::sha256c_update] != {}}]
+ }
+ }
+ default {
+ return -code error "invalid accelerator $key:\
+ must be one of [join [KnownImplementations] {, }]"
+ }
+ }
+ set accel($name) $r
+ return $r
+}
+
+# ::sha2::Implementations --
+#
+# Determines which implementations are
+# present, i.e. loaded.
+#
+# Arguments:
+# None.
+#
+# Results:
+# A list of implementation keys.
+
+proc ::sha2::Implementations {} {
+ variable accel
+ set res {}
+ foreach n [array names accel] {
+ if {!$accel($n)} continue
+ lappend res $n
+ }
+ return $res
+}
+
+# ::sha2::KnownImplementations --
+#
+# Determines which implementations are known
+# as possible implementations.
+#
+# Arguments:
+# None.
+#
+# Results:
+# A list of implementation keys. In the order
+# of preference, most prefered first.
+
+proc ::sha2::KnownImplementations {} {
+ return {critcl tcl}
+}
+
+proc ::sha2::Names {} {
+ return {
+ critcl {tcllibc based}
+ tcl {pure Tcl}
+ }
+}
+
+# ::sha2::SwitchTo --
+#
+# Activates a loaded named implementation.
+#
+# Arguments:
+# key Name of the implementation to activate.
+#
+# Results:
+# None.
+
+proc ::sha2::SwitchTo {key} {
+ variable accel
+ variable loaded
+
+ if {[string equal $key $loaded]} {
+ # No change, nothing to do.
+ return
+ } elseif {![string equal $key ""]} {
+ # Validate the target implementation of the switch.
+
+ if {![info exists accel($key)]} {
+ return -code error "Unable to activate unknown implementation \"$key\""
+ } elseif {![info exists accel($key)] || !$accel($key)} {
+ return -code error "Unable to activate missing implementation \"$key\""
+ }
+ }
+
+ # Deactivate the previous implementation, if there was any.
+
+ if {![string equal $loaded ""]} {
+ foreach c {
+ SHA256Init SHA224Init
+ SHA256Final SHA224Final
+ SHA256Update
+ } {
+ rename ::sha2::$c ::sha2::${c}-${loaded}
+ }
+ }
+
+ # Activate the new implementation, if there is any.
+
+ if {![string equal $key ""]} {
+ foreach c {
+ SHA256Init SHA224Init
+ SHA256Final SHA224Final
+ SHA256Update
+ } {
+ rename ::sha2::${c}-${key} ::sha2::$c
+ }
+ }
+
+ # Remember the active implementation, for deactivation by future
+ # switches.
+
+ set loaded $key
+ return
+}
+
+# -------------------------------------------------------------------------
+
+# SHA256Init --
+#
+# Create and initialize an SHA256 state variable. This will be
+# cleaned up when we call SHA256Final
+#
+
+proc ::sha2::SHA256Init-tcl {} {
+ variable uid
+ set token [namespace current]::[incr uid]
+ upvar #0 $token tok
+
+ # FIPS 180-2: 5.3.2 Setting the initial hash value
+ array set tok \
+ [list \
+ A [expr {int(0x6a09e667)}] \
+ B [expr {int(0xbb67ae85)}] \
+ C [expr {int(0x3c6ef372)}] \
+ D [expr {int(0xa54ff53a)}] \
+ E [expr {int(0x510e527f)}] \
+ F [expr {int(0x9b05688c)}] \
+ G [expr {int(0x1f83d9ab)}] \
+ H [expr {int(0x5be0cd19)}] \
+ n 0 i "" v 256]
+ return $token
+}
+
+proc ::sha2::SHA256Init-critcl {} {
+ variable uid
+ set token [namespace current]::[incr uid]
+ upvar #0 $token tok
+
+ # FIPS 180-2: 5.3.2 Setting the initial hash value
+ set tok(sha256c) [sha256c_init256]
+ return $token
+}
+
+# SHA256Update --
+#
+# 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 ::sha2::SHA256Update-tcl {token data} {
+ upvar #0 $token state
+
+ # 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} {} {
+ SHA256Transform $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
+}
+
+proc ::sha2::SHA256Update-critcl {token data} {
+ upvar #0 $token state
+
+ set state(sha256c) [sha256c_update $data $state(sha256c)]
+ return
+}
+
+# SHA256Final --
+#
+# 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 256 bits represented as binary data.
+#
+
+proc ::sha2::SHA256Final-tcl {token} {
+ upvar #0 $token state
+ SHA256Penultimate $token
+
+ # Output
+ set r [bytes $state(A)][bytes $state(B)][bytes $state(C)][bytes $state(D)][bytes $state(E)][bytes $state(F)][bytes $state(G)][bytes $state(H)]
+ unset state
+ return $r
+}
+
+proc ::sha2::SHA256Final-critcl {token} {
+ upvar #0 $token state
+ set r $state(sha256c)
+ unset state
+ return $r
+}
+
+# SHA256Penultimate --
+#
+#
+proc ::sha2::SHA256Penultimate {token} {
+ upvar #0 $token state
+
+ # FIPS 180-2: 5.1.1: Padding the message
+ #
+ 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} {} {
+ SHA256Transform $token [string range $state(i) $n [incr n 64]]
+ }
+}
+
+# -------------------------------------------------------------------------
+
+proc ::sha2::SHA224Init-tcl {} {
+ variable uid
+ set token [namespace current]::[incr uid]
+ upvar #0 $token tok
+
+ # FIPS 180-2 (change notice 1) (1): SHA-224 initialization values
+ array set tok \
+ [list \
+ A [expr {int(0xc1059ed8)}] \
+ B [expr {int(0x367cd507)}] \
+ C [expr {int(0x3070dd17)}] \
+ D [expr {int(0xf70e5939)}] \
+ E [expr {int(0xffc00b31)}] \
+ F [expr {int(0x68581511)}] \
+ G [expr {int(0x64f98fa7)}] \
+ H [expr {int(0xbefa4fa4)}] \
+ n 0 i "" v 224]
+ return $token
+}
+
+proc ::sha2::SHA224Init-critcl {} {
+ variable uid
+ set token [namespace current]::[incr uid]
+ upvar #0 $token tok
+
+ # FIPS 180-2 (change notice 1) (1): SHA-224 initialization values
+ set tok(sha256c) [sha256c_init224]
+ return $token
+}
+
+interp alias {} ::sha2::SHA224Update {} ::sha2::SHA256Update
+
+proc ::sha2::SHA224Final-tcl {token} {
+ upvar #0 $token state
+ SHA256Penultimate $token
+
+ # Output
+ set r [bytes $state(A)][bytes $state(B)][bytes $state(C)][bytes $state(D)][bytes $state(E)][bytes $state(F)][bytes $state(G)]
+ unset state
+ return $r
+}
+
+proc ::sha2::SHA224Final-critcl {token} {
+ upvar #0 $token state
+ # Trim result down to 224 bits (by 4 bytes).
+ # See output below, A..G, not A..H
+ set r [string range $state(sha256c) 0 end-4]
+ 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 ::sha2::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 [SHA256Init]
+ SHA256Update $tok $K
+ set K [SHA256Final $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 [SHA256Init]
+ SHA256Update $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 SHA256Update
+#
+proc ::sha2::HMACUpdate {token data} {
+ SHA256Update $token $data
+ return
+}
+
+# HMACFinal --
+#
+# This is equivalent to the SHA256Final procedure. The hash context is
+# closed and the binary representation of the hash result is returned.
+#
+proc ::sha2::HMACFinal {token} {
+ upvar #0 $token state
+
+ set tok [SHA256Init]; # init the outer hashing function
+ SHA256Update $tok $state(Ko); # prepare with the outer pad.
+ SHA256Update $tok [SHA256Final $token]; # hash the inner result
+ return [SHA256Final $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 ::sha2::SHA256Transform_body {
+ variable K
+ upvar #0 $token state
+
+ # FIPS 180-2: 6.2.2 SHA-256 Hash computation.
+ 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 180-2: 6.2.2 (1) Prepare the message schedule
+ # For t = 16 to 64
+ # let Wt = (sigma1(Wt-2) + Wt-7 + sigma0(Wt-15) + Wt-16)
+ set t2 13
+ set t7 8
+ set t15 0
+ set t16 -1
+ for {set t 16} {$t < 64} {incr t} {
+ lappend W [expr {([sigma1 [lindex $W [incr t2]]] \
+ + [lindex $W [incr t7]] \
+ + [sigma0 [lindex $W [incr t15]]] \
+ + [lindex $W [incr t16]]) & 0xffffffff}]
+ }
+
+ # FIPS 180-2: 6.2.2 (2) Initialise the working variables
+ set A $state(A)
+ set B $state(B)
+ set C $state(C)
+ set D $state(D)
+ set E $state(E)
+ set F $state(F)
+ set G $state(G)
+ set H $state(H)
+
+ # FIPS 180-2: 6.2.2 (3) Do permutation rounds
+ # For t = 0 to 63 do
+ # T1 = h + SIGMA1(e) + Ch(e,f,g) + Kt + Wt
+ # T2 = SIGMA0(a) + Maj(a,b,c)
+ # h = g; g = f; f = e; e = d + T1; d = c; c = b; b = a;
+ # a = T1 + T2
+ #
+ for {set t 0} {$t < 64} {incr t} {
+ set T1 [expr {($H + [SIGMA1 $E] + [Ch $E $F $G]
+ + [lindex $K $t] + [lindex $W $t]) & 0xffffffff}]
+ set T2 [expr {([SIGMA0 $A] + [Maj $A $B $C]) & 0xffffffff}]
+ set H $G
+ set G $F
+ set F $E
+ set E [expr {($D + $T1) & 0xffffffff}]
+ set D $C
+ set C $B
+ set B $A
+ set A [expr {($T1 + $T2) & 0xffffffff}]
+ }
+
+ # FIPS 180-2: 6.2.2 (4) Compute the intermediate hash
+ incr state(A) $A
+ incr state(B) $B
+ incr state(C) $C
+ incr state(D) $D
+ incr state(E) $E
+ incr state(F) $F
+ incr state(G) $G
+ incr state(H) $H
+ }
+
+ return
+}
+
+# -------------------------------------------------------------------------
+
+# FIPS 180-2: 4.1.2 equation 4.2
+proc ::sha2::Ch {x y z} {
+ return [expr {($x & $y) ^ (~$x & $z)}]
+}
+
+# FIPS 180-2: 4.1.2 equation 4.3
+proc ::sha2::Maj {x y z} {
+ return [expr {($x & $y) ^ ($x & $z) ^ ($y & $z)}]
+}
+
+# FIPS 180-2: 4.1.2 equation 4.4
+# (x >>> 2) ^ (x >>> 13) ^ (x >>> 22)
+proc ::sha2::SIGMA0 {x} {
+ return [expr {[>>> $x 2] ^ [>>> $x 13] ^ [>>> $x 22]}]
+}
+
+# FIPS 180-2: 4.1.2 equation 4.5
+# (x >>> 6) ^ (x >>> 11) ^ (x >>> 25)
+proc ::sha2::SIGMA1 {x} {
+ return [expr {[>>> $x 6] ^ [>>> $x 11] ^ [>>> $x 25]}]
+}
+
+# FIPS 180-2: 4.1.2 equation 4.6
+# s0 = (x >>> 7) ^ (x >>> 18) ^ (x >> 3)
+proc ::sha2::sigma0 {x} {
+ #return [expr {[>>> $x 7] ^ [>>> $x 18] ^ (($x >> 3) & 0x1fffffff)}]
+ return [expr {((($x<<25) | (($x>>7) & (0x7FFFFFFF>>6))) \
+ ^ (($x<<14) | (($x>>18) & (0x7FFFFFFF>>17))) & 0xFFFFFFFF) \
+ ^ (($x>>3) & 0x1fffffff)}]
+}
+
+# FIPS 180-2: 4.1.2 equation 4.7
+# s1 = (x >>> 17) ^ (x >>> 19) ^ (x >> 10)
+proc ::sha2::sigma1 {x} {
+ #return [expr {[>>> $x 17] ^ [>>> $x 19] ^ (($x >> 10) & 0x003fffff)}]
+ return [expr {((($x<<15) | (($x>>17) & (0x7FFFFFFF>>16))) \
+ ^ (($x<<13) | (($x>>19) & (0x7FFFFFFF>>18))) & 0xFFFFFFFF) \
+ ^ (($x >> 10) & 0x003fffff)}]
+}
+
+# 32bit rotate-right
+proc ::sha2::>>> {v n} {
+ return [expr {(($v << (32 - $n)) \
+ | (($v >> $n) & (0x7FFFFFFF >> ($n - 1)))) \
+ & 0xFFFFFFFF}]
+}
+
+# 32bit rotate-left
+proc ::sha2::<<< {v n} {
+ return [expr {((($v << $n) \
+ | (($v >> (32 - $n)) \
+ & (0x7FFFFFFF >> (31 - $n))))) \
+ & 0xFFFFFFFF}]
+}
+
+# -------------------------------------------------------------------------
+# We speed up the SHA256Transform code while maintaining readability in the
+# source code by substituting inline for a number of functions.
+# The idea is to reduce the number of [expr] calls.
+
+# Inline the Ch function
+regsub -all -line \
+ {\[Ch (\$[ABCDEFGH]) (\$[ABCDEFGH]) (\$[ABCDEFGH])\]} \
+ $::sha2::SHA256Transform_body \
+ {((\1 \& \2) ^ ((~\1) \& \3))} \
+ ::sha2::SHA256Transform_body
+
+# Inline the Maj function
+regsub -all -line \
+ {\[Maj (\$[ABCDEFGH]) (\$[ABCDEFGH]) (\$[ABCDEFGH])\]} \
+ $::sha2::SHA256Transform_body \
+ {((\1 \& \2) ^ (\1 \& \3) ^ (\2 \& \3))} \
+ ::sha2::SHA256Transform_body
+
+
+# Inline the SIGMA0 function
+regsub -all -line \
+ {\[SIGMA0 (\$[ABCDEFGH])\]} \
+ $::sha2::SHA256Transform_body \
+ {((((\1<<30) | ((\1>>2) \& (0x7FFFFFFF>>1))) \& 0xFFFFFFFF) \
+ ^ (((\1<<19) | ((\1>>13) \& (0x7FFFFFFF>>12))) \& 0xFFFFFFFF) \
+ ^ (((\1<<10) | ((\1>>22) \& (0x7FFFFFFF>>21))) \& 0xFFFFFFFF) \
+ )} \
+ ::sha2::SHA256Transform_body
+
+# Inline the SIGMA1 function
+regsub -all -line \
+ {\[SIGMA1 (\$[ABCDEFGH])\]} \
+ $::sha2::SHA256Transform_body \
+ {((((\1<<26) | ((\1>>6) \& (0x7FFFFFFF>>5))) \& 0xFFFFFFFF) \
+ ^ (((\1<<21) | ((\1>>11) \& (0x7FFFFFFF>>10))) \& 0xFFFFFFFF) \
+ ^ (((\1<<7) | ((\1>>25) \& (0x7FFFFFFF>>24))) \& 0xFFFFFFFF) \
+ )} \
+ ::sha2::SHA256Transform_body
+
+proc ::sha2::SHA256Transform {token msg} $::sha2::SHA256Transform_body
+
+# -------------------------------------------------------------------------
+
+# Convert a integer value into a binary string in big-endian order.
+proc ::sha2::byte {n v} {expr {((0xFF << (8 * $n)) & $v) >> (8 * $n)}}
+proc ::sha2::bytes {v} {
+ #format %c%c%c%c [byte 3 $v] [byte 2 $v] [byte 1 $v] [byte 0 $v]
+ format %c%c%c%c \
+ [expr {((0xFF000000 & $v) >> 24) & 0xFF}] \
+ [expr {(0xFF0000 & $v) >> 16}] \
+ [expr {(0xFF00 & $v) >> 8}] \
+ [expr {0xFF & $v}]
+}
+
+# -------------------------------------------------------------------------
+
+proc ::sha2::Hex {data} {
+ binary scan $data H* result
+ return $result
+}
+
+# -------------------------------------------------------------------------
+
+# Description:
+# Pop the nth element off a list. Used in options processing.
+#
+proc ::sha2::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 ::sha2::Chunk {token channel {chunksize 4096}} {
+ upvar #0 $token state
+
+ if {[eof $channel]} {
+ fileevent $channel readable {}
+ set state(reading) 0
+ }
+
+ SHA256Update $token [read $channel $chunksize]
+}
+
+# -------------------------------------------------------------------------
+
+proc ::sha2::_sha256 {ver 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 $args] != 1} {
+ return -code error "wrong # args: should be\
+ \"[namespace current]::sha$ver ?-hex|-bin? -filename file\
+ | -channel channel | string\""
+ }
+ set tok [SHA${ver}Init]
+ SHA${ver}Update $tok [lindex $args 0]
+ set r [SHA${ver}Final $tok]
+
+ } else {
+
+ set tok [SHA${ver}Init]
+ # FRINK: nocheck
+ set [subst $tok](reading) 1
+ fileevent $opts(-channel) readable \
+ [list [namespace origin Chunk] \
+ $tok $opts(-channel) $opts(-chunksize)]
+ # FRINK: nocheck
+ vwait [subst $tok](reading)
+ set r [SHA${ver}Final $tok]
+
+ # If we opened the channel - we should close it too.
+ if {$opts(-filename) != {}} {
+ close $opts(-channel)
+ }
+ }
+
+ if {$opts(-hex)} {
+ set r [Hex $r]
+ }
+ return $r
+}
+
+interp alias {} ::sha2::sha256 {} ::sha2::_sha256 256
+interp alias {} ::sha2::sha224 {} ::sha2::_sha256 224
+
+# -------------------------------------------------------------------------
+
+proc ::sha2::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 ::sha2 {
+ variable e {}
+ foreach e [KnownImplementations] {
+ if {[LoadAccelerator $e]} {
+ SwitchTo $e
+ break
+ }
+ }
+ unset e
+}
+
+package provide sha256 $::sha2::version
+
+# -------------------------------------------------------------------------
+# Local Variables:
+# mode: tcl
+# indent-tabs-mode: nil
+# End:
projects / web/konrad/taurus.git / commitdiff