The code generating the error in question is 

croak "Argument to -salt must be exactly 8 bytes long" if defined $sal
+t && length $salt != 8 && $salt ne '1';

[download]

The condition for the error message hasn't changed since the error message was introduced in 2.17.

You shouldn't get the error when using -salt => 1. Presumably, the error is elsewhere.

In reply to Re: decryption problem by ikegami
in thread decryption problem by Anonymous Monk

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