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I am trying to use atPublicKey authentication in SFtp component.
It works fine.
I have tested what happens if the key is corrupt (simply edited the key).
I get an exception on TScSFTPClient.Initialize() method - it is right.
The exception message is: "An error occurred when signing data: %s"
I saw in the debugger that another exception appears first: "Invalid PCKS1 padding, data is currupt".
This exception is lost.
It would be nice to see:
"An error occurred when signing data: Invalid PCKS1 padding, data is currupt ".

From the security perspective, the behavior is correct. We're not planning to change it, though you may purchase the SecureBridge Professional with source code and implement the needed functionality yourself.