Norman Maurer 3367a53d3b
Throw SignatureException if OpenSslPrivateKeyMethod.* return null to prevent segfault (#9100)
Motivation:

While OpenSslPrivateKeyMethod.* should never return null we should still guard against it to prevent any possible segfault.

Modifications:

- Throw SignatureException if null is returned
- Add unit test

Result:

No segfault when user returns null.
2019-04-29 08:31:14 +02:00
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