Encrypts and signs data with the given keys.
If an error occurs, null is returned
@param data data to be signed and encrypted @param encryptionKey key to which should be encrypted @param signingKey key which should sign @return encrypted and signed dataExecutes gpg with all corresponding options to encrypt and sign the given data and return them as ASCII amored text.
In use are the -esa and --always-trust, see gpg manual for more information.
@param data data to be encrypted @param encryptionKey encryption key to use @param signingKey signing key to use @return encrypted and signed data, null, if not possible @see de.tuclausthal.informatik.winf.mobileagents.security.CryptographicProvider#encryptAndSign
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