Key value has incorrect length for the declared key type

What causes this issue?

The presented key value has an incorrect overall length.

System Response

The key cannot be imported.

How to fix this error?

Check that you have entered the correct value for the key material.
Do not omit leading and trailing zeros.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.