Exception handling in Java

The general crypto exception thrown by all methods of the library is com.didisoft.pgp.PGPException. A quick exception handling solution is to catch only PGPException and log it’s stack trace

try {
} catch (com.didisoft.pgp.PGPException e) {

However the exception cause can be classified further at runtime, thus identifying what exactly has failed. The distinction of the causes is achieved by sub classes of com.didisoft.pgp.PGPException. They must be called earlier than PGPException.

Below is a list of the exceptions that subclass com.didisoft.pgp.PGPException provided by the library. They are all located in the package com.didisoft.pgp.exceptions

Exception Short description
FileIsEncryptedException Indicates that a file is OpenPGP encrypted
FileIsPBEEncryptedException Indicates that a file is encrypted with a password
IntegrityCheckException Indicates that an integrity protected archive is corrupted
KeyIsExpiredException Shows that a public key we try to use is expired
KeyIsRevokedException Shows that a public key we try to use is revoked
NonPGPDataException Shows that a file is not an OpenPGP archive
NoPrivateKeyFoundException Indicates that the supplied private key source is invalid
NoPublicKeyFoundException Indicates that the supplied public key source is invalid
WrongPasswordException Indicates that the provided password is wrong
WrongPrivateKeyException Shows that an OpenPGP message is archived with a different key than the provided one
DetachedSignatureException Thrown when we want to verify a detached signature with a methods that expects a signed file

Concrete example with the expected PGPException sub classes can be found at the end of each chapter in this tutorial.