Note the last response in the bug report (even if all other parameters are different) that mentions the use of hashed key in v2.33 but literal key string in v3.03 & recovering the hashed key from v2.33 (to use as "plaintext" key in later version).

In reply to Re^3: Crypt::CBC 2.33 -> Crypt::CBC 3.04 incompatibilities by parv
in thread Crypt::CBC 2.33 -> Crypt::CBC 3.04 incompatibilities by mmlenz

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