to const BF_KEY * vars, and I chose to ``fix'' it in this file
rather than elsewhere in the framework because, although the other
fix was more appropriate, nothing seems to use the code in this
file and hence the risk of disrupting other people was lower. In
the future, the more appropriate change would be to change blowfish.h
and bf_enc.c to have functions with signatures:
BF_encrypt(BF_LONG *, const BF_KEY *);
BF_decrypt(BF_LONG *, const BF_KEY *);
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