63 lines
1.6 KiB
Factor
63 lines
1.6 KiB
Factor
IN: crypto-internals
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USING: kernel io strings sequences namespaces math prettyprint
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test parser lists ;
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: w+ ( int -- int )
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+ HEX: ffffffff bitand ; inline
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: nth-int ( string n -- int )
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2 shift dup 4 + rot <slice> le> ; inline
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: nth-int-be ( string n -- int )
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2 shift dup 4 + rot <slice> be> ; inline
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: float-sin ( int -- int )
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sin abs 4294967296 * >bignum ; inline
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: update ( num var -- )
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[ 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. leave 8 bytes for length after padding
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: zero-pad-length ( length -- pad-length )
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dup 56 < 55 119 ? swap - ; ! one less for first byte of padding 0x80
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! pad 0x80 then 00 til 8 bytes left, then 64bit length in bits
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: pad-string-md5 ( string -- padded-string )
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[
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dup % HEX: 80 ,
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dup length HEX: 3f bitand zero-pad-length 0 <string> %
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dup length 3 shift 8 >le %
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] "" make nip ;
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: pad-string-sha1 ( string -- padded-string )
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[
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dup % HEX: 80 ,
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dup length HEX: 3f bitand zero-pad-length 0 <string> %
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dup length 3 shift 8 >be %
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] "" make nip ;
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: num-blocks ( length -- num )
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-6 shift ;
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: get-block ( string num -- string )
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6 shift dup 64 + rot <slice> ;
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: shift-mod ( n s w -- n )
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>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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: hex-string ( str -- str )
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[ [ >hex 2 48 pad-left % ] each ] "" make ;
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