Uses asymmetric encryption to decrypt cypherText into clearText.
clearText is a base64 encoded string which is first decoded and then decrypted
Parameters: clearText - Parameters: passPhrase - throws: EncryptionEngineException -
Uses asymmetric encryption to encrypt clearText into cypherText. Base64 Encodes
the cypherText and returns the base 64 encoded string
Parameters: clearText - Parameters: passPhrase - throws: EncryptionEngineException - - if there is an error during encryption