Return to readme CVS log

Up to [PGP] / pgp / contrib / idea

Annotation of pgp/contrib/idea/readme, revision 1.1.1.1

1.1       root        1: This is some source code that does high-speed IDEA CFB encryption on
                      2: an 80x86.  The functions are not complete, in that they don't handle
                      3: blocks that are not a multiple of 8 bytes long, but it's a start, and
                      4: is included here for anybody to experiment with.  It is as efficient
                      5: as I could make it.  If USELODS is not set during assembly, a version
                      6: that uses the minimum number of instructions possible is produced.
                      7: USELODS, however, seems to be faster.  I have not tried it on a '486
                      8: yet.
                      9: 
                     10: Test.c is a test driver that times the code.  For real use, you'd need
                     11: to add key-unpacking code and code to handle odd-sized buffers.  The code
                     12: here is designed to be the middle part in a loop for encrypting an
                     13: arbitrary number of bytes:
                     14: 
                     15: xor leading odd bytes
                     16: IDEA encrypt
                     17: (xor 8 bytes and IDEA encrypt) as often as necessary
                     18: xor trailing odd bytes
                     19: 
                     20: It will probably become part of PGP some day.
                     21: -- 
                     22:        -Colin <[email protected]>

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.