only process supported Putty v3 keys + minor optimizations - #729
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hierynomus
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Oct 2, 2021
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As mentioned in #716 the current Puttyv3 support is limited to unencrypted key files as the new file format uses Argon based key derivation functions . This PR adds checks so that we do not try to decrypt a key we can never decrypt successfully because of the missing Argon implementation.
Instead a describing exception is thrown so it is clear that the password was not the problem.
A unit test for an encrypted RSA putty v3 key has been added.
Additionally I made some small optimizations on the putty key loading code.