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Perhaps a non issue but I thought it was worth reporting that:
The following function is undefined:
IRONCLAD::CAST5-S-BOX which is referenced by IRONCLAD::CAST5-DECRYPT-BLOCK
When compiling with LispWorks 6.1 Mac OS X 32 bits.
make CAST5-S-BOX visible in CAST5-DECRYPT-BLOCK; fixes #28