! See http://factorcode.org/license.txt for BSD license.
USING: accessors byte-arrays byte-vectors checksums grouping io
io.backend io.binary io.encodings.binary io.files kernel make
-math sequences ;
+math sequences locals ;
IN: checksums.common
: calculate-pad-length ( length -- length' )
GENERIC: get-checksum ( checksum-state -- value )
-: add-checksum-bytes ( checksum-state data -- checksum-state' )
- [
- over bytes>> [ push-all ] keep
- [ dup length pick block-size>> >= ]
- [
- over block-size>> cut-slice [
- over checksum-block
- [ block-size>> ] keep [ + ] change-bytes-read
- ] dip
- ] while
- >byte-vector >>bytes
- ] keep
- length 64 mod [ + ] curry change-bytes-read ;
+: next-level ( n size -- n' )
+ 2dup mod [ + ] [ - + ] if-zero ; inline
+
+! Update the bytes-read before calculating checksum in case checksum uses
+! this in the calculation.
+:: add-checksum-bytes ( state data -- state' )
+ state block-size>> :> block-size
+ state bytes>> length :> initial-len
+ data length :> data-len
+ initial-len data-len + :> total-len
+ total-len block-size /mod :> ( n extra )
+ data state bytes>> [ push-all ] keep :> all-bytes
+ n zero? [
+ state [ data-len + ] change-bytes-read drop
+ ] [
+ all-bytes block-size <groups> [ length 64 = ] partition [
+ [ state [ block-size next-level ] change-bytes-read drop state checksum-block ] each
+ BV{ } clone state bytes<<
+ ] [
+ [
+ first
+ [ length state [ + ] change-bytes-read drop ]
+ [ >byte-vector state bytes<< ] bi
+ ] unless-empty
+ ] bi*
+ ] if state ;
: add-checksum-stream ( checksum-state stream -- checksum-state )
[ [ add-checksum-bytes ] each-block ] with-input-stream ;
USING: arrays checksums checksums.common checksums.sha
checksums.sha.private io.encodings.binary io.streams.byte-array
-kernel math.parser sequences tools.test ;
+kernel math.parser sequences tools.test random ;
IN: checksums.sha.tests
: test-checksum ( text identifier -- checksum )
sha1 initialize-checksum-state bytes-a bytes-b append add-checksum-bytes get-checksum
sha1 initialize-checksum-state bytes-a add-checksum-bytes bytes-b add-checksum-bytes get-checksum =
] unit-test
+
+: incremental-checksum ( algorithm seqs -- checksum )
+ [ initialize-checksum-state ] dip
+ [ add-checksum-bytes ] each get-checksum ;
+
+: one-go-checksum ( algorithm seqs -- checksum )
+ [ initialize-checksum-state ] dip
+ concat add-checksum-bytes get-checksum ;
+
+ERROR: checksums-differ algorithm seq incremental-checksum one-go-checksum ;
+: compare-checksum-calculations ( algorithm seq -- ? )
+ 2dup [ incremental-checksum ] [ one-go-checksum ] 2bi 2dup = [
+ 2drop 2drop t
+ ] [
+ checksums-differ
+ ] if ;
+
+{ t } [ 100 iota [ drop sha1 100 [ 100 random random-bytes ] replicate compare-checksum-calculations ] all? ] unit-test
+{ t } [ 100 iota [ drop sha1 20 [ 20 random random-bytes ] replicate compare-checksum-calculations ] all? ] unit-test
+{ t } [ 100 iota [ drop sha1 10 [ 10 random random-bytes ] replicate compare-checksum-calculations ] all? ] unit-test
+
+{ t } [ sha1 {
+ B{ 105 27 166 214 73 114 110 }
+ B{ 39 162 16 218 0 42 }
+ B{ 129 235 197 233 }
+ B{ 61 29 254 66 67 }
+ B{ 28 236 253 45 240 123 134 191 22 }
+ B{ 220 27 205 59 27 48 }
+ B{ 249 2 196 177 74 195 12 131 91 }
+ B{ 174 102 159 89 250 38 230 5 }
+ B{ 126 22 231 253 118 64 }
+ B{ 185 127 20 126 123 35 204 243 43 }
+ } compare-checksum-calculations
+] unit-test