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18ffcdd7c3
Per https://www.openssl.org/docs/crypto/pem.html, specifying to encrypt a private key with DES *without* providing a passphrase causes OpenSSL to prompt for the passphrase to use on the console -- which is problematic for GUI applications which generally lack a console. This modifies the behavior of RSAKeyImpl::save() so that DES encryption of private keys will not be attempted unless the passphrase argument is non-empty. This will also suppress OpenSSL's prompting for that passphrase on the console. Also added a case to the test suite.