Verify sizes before arithmetic operations

Unsigned overflows are not a bug in C but we have to make sure that
requested buffer sizes will be actually available.

If not, set errno to ERANGE and retu

Verify sizes before arithmetic operations

Unsigned overflows are not a bug in C but we have to make sure that
requested buffer sizes will be actually available.

If not, set errno to ERANGE and return an error value.

ok deraadt, millert

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Hookup ber regress.

ok bluhm@

link subdir

Move the commented out test program in pkcs5_pbkdf2.c into a proper
regress test.

Regression for fmt_scaled() and scan_scaled().