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CONTRIB
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IDEA
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README
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1993-06-15
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This is some source code that does high-speed IDEA CFB encryption on
an 80x86. The functions are not complete, in that they don't handle
blocks that are not a multiple of 8 bytes long, but it's a start, and
is included here for anybody to experiment with. It is as efficient
as I could make it. If USELODS is not set during assembly, a version
that uses the minimum number of instructions possible is produced.
USELODS, however, seems to be faster. I have not tried it on a '486
yet.
Test.c is a test driver that times the code. For real use, you'd need
to add key-unpacking code and code to handle odd-sized buffers. The code
here is designed to be the middle part in a loop for encrypting an
arbitrary number of bytes:
xor leading odd bytes
IDEA encrypt
(xor 8 bytes and IDEA encrypt) as often as necessary
xor trailing odd bytes
It will probably become part of PGP some day.
--
-Colin <colin@nyx.cs.du.edu>