add authenticated garbling core in trusted dealer model #217
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This PR adds the core authenticated garbling protocol from WRK17 in the trusted dealer model (assuming an ideal preprocessing functionality). The source code is added to mpz-garble-core/src/ in auth_gen.rs, auth_eval.rs and fpre.rs. Test code is in lib.rs. Currently, fpre.rs is a substitute to generate the required preprocessing material and will be substituted with a secure implementation using COT in a future PR.