62 lines
1.9 KiB
Factor
62 lines
1.9 KiB
Factor
IN: crypto-internals
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USING: kernel io strings sequences namespaces math parser ;
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IN: crypto
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: >32-bit ( n -- n ) HEX: ffffffff bitand ; inline
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: >64-bit ( n -- n ) HEX: ffffffffffffffff bitand ; inline
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IN: crypto-internals
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: w+ ( int -- int ) + >32-bit ; inline
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: nth-int ( string n -- int ) 2 shift dup 4 + rot <slice> le> ; inline
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: nth-int-be ( string n -- int ) 2 shift dup 4 + rot <slice> be> ; inline
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: update ( num var -- ) [ w+ ] change ; inline
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: update-old-new ( old new -- )
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[ get >r get r> ] 2keep >r >r w+ dup r> set r> set ; inline
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: calculate-pad-length ( length -- pad-length )
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dup 56 < 55 119 ? swap - ;
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: preprocess-plaintext ( string big-endian? -- padded-string )
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#! pad 0x80 then 00 til 8 bytes left, then 64bit length in bits
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>r >sbuf r> over [
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HEX: 80 ,
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dup length HEX: 3f bitand calculate-pad-length 0 <string> %
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length 3 shift 8 rot [ >be ] [ >le ] if %
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] "" make dupd nappend ;
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SYMBOL: bytes-read
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SYMBOL: big-endian?
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: pad-last-block ( str big-endian? length -- str )
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[
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rot %
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HEX: 80 ,
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dup HEX: 3f bitand calculate-pad-length 0 <string> %
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3 shift 8 rot [ >be ] [ >le ] if %
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] "" make 64 group ;
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: shift-mod ( n s w -- n ) >r shift r> 1 swap shift 1 - bitand ; inline
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IN: crypto
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: bitroll ( n s w -- n' )
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#! Roll n by s bits to the left, wrapping around after
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#! w bits.
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[ 1 - bitand ] keep
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over 0 < [ [ + ] keep ] when
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[ shift-mod ] 3keep
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[ - ] keep shift-mod bitor ; inline
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: bitroll-32 ( n s -- n' ) 32 bitroll ;
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: bitroll-64 ( n s -- n' ) 64 bitroll ;
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: hex-string ( str -- str ) [ [ >hex 2 48 pad-left % ] each ] "" make ;
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: slice3 ( n seq -- a b c ) >r dup 3 + r> <slice> first3 ;
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: 4dup ( a b c d -- a b c d a b c d )
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>r >r 2dup r> r> 2swap >r >r 2dup r> r> 2swap ;
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: 4keep ( w x y z quot -- w x y z )
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>r 4dup r> swap >r swap >r swap >r swap >r call r> r> r> r> ; inline
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