Package org.apache.sysds.runtime.controlprogram.paramserv

Class NativeHEHelper

  • public class NativeHEHelper
extends Object

    • Constructor Summary

      Constructors 
      Constructor Description
      NativeHEHelper()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static byte[] accumulateCiphertexts​(long server, byte[][] ciphertexts)
      accumulates the given ciphertexts into a sum ciphertext and returns it
      static byte[] aggregatePartialPublicKeys​(long server, byte[][] partial_public_keys)
      accumulates the given partial public keys into a public key, stores it in server and returns it
      static double[] average​(long server, byte[] encrypted_sum, byte[][] partial_plaintexts)
      averages the partial decryptions and returns the result
      static byte[] encrypt​(long client, double[] plaintexts)
      encrypts data with public key stored in client setPublicKey() must have been called before calling this
      static byte[] generateA​(long server)
      this generates the a constant.
      static byte[] generatePartialPublicKey​(long client)
      generates a partial public key stores a partial private key corresponding to the partial public key in client
      static long initClient​(byte[] a)
      generates a Client object
      static boolean initialize()  
      static long initServer()
      generates the Server object and returns a pointer to it
      static byte[] partiallyDecrypt​(long client, byte[] ciphertext)
      partially decrypts ciphertexts with the partial private key.
      static void setPublicKey​(long client, byte[] public_key)
      sets the public key and stores it in client

    • Constructor Detail

      • NativeHEHelper

        public NativeHEHelper()

    • Method Detail

      • initialize

        public static boolean initialize()

      • initClient

        public static long initClient​(byte[] a)
        generates a Client object
        Parameters:
        a - a constant generated by generateA
        Returns:
        a pointer to the native client object

      • generatePartialPublicKey

        public static byte[] generatePartialPublicKey​(long client)
        generates a partial public key stores a partial private key corresponding to the partial public key in client
        Parameters:
        client - A pointer to a Client, obtained from initClient
        Returns:
        a serialized partial public key

      • setPublicKey

        public static void setPublicKey​(long client,
                                byte[] public_key)
        sets the public key and stores it in client
        Parameters:
        client - A pointer to a Client, obtained from initClient
        public_key - serialized public key obtained from generatePartialPublicKey

      • encrypt

        public static byte[] encrypt​(long client,
                             double[] plaintexts)
        encrypts data with public key stored in client setPublicKey() must have been called before calling this
        Parameters:
        client - A pointer to a Client, obtained from initClient
        plaintexts - array of double values to be encrypted
        Returns:
        serialized ciphertext

      • partiallyDecrypt

        public static byte[] partiallyDecrypt​(long client,
                                      byte[] ciphertext)
        partially decrypts ciphertexts with the partial private key. generatePartialPublicKey() must have been called before calling this function
        Parameters:
        client - A pointer to a Client, obtained from initClient
        ciphertext - serialized ciphertext
        Returns:
        serialized partial decryption

      • initServer

        public static long initServer()
        generates the Server object and returns a pointer to it
        Returns:
        pointer to a native Server object

      • generateA

        public static byte[] generateA​(long server)
        this generates the a constant. in a future version we want to generate this together with the clients to prevent misuse
        Parameters:
        server - A pointer to a Server, obtained from initServer
        Returns:
        serialized a constant

      • aggregatePartialPublicKeys

        public static byte[] aggregatePartialPublicKeys​(long server,
                                                byte[][] partial_public_keys)
        accumulates the given partial public keys into a public key, stores it in server and returns it
        Parameters:
        server - A pointer to a Server, obtained from initServer
        partial_public_keys - array of serialized partial public keys
        Returns:
        serialized partial public key

      • accumulateCiphertexts

        public static byte[] accumulateCiphertexts​(long server,
                                           byte[][] ciphertexts)
        accumulates the given ciphertexts into a sum ciphertext and returns it
        Parameters:
        server - A pointer to a Server, obtained from initServer
        ciphertexts - array of serialized ciphertexts
        Returns:
        serialized accumulated ciphertext

      • average

        public static double[] average​(long server,
                               byte[] encrypted_sum,
                               byte[][] partial_plaintexts)
        averages the partial decryptions and returns the result
        Parameters:
        server - A pointer to a Server, obtained from initServer
        encrypted_sum - the result of accumulateCiphertexts()
        partial_plaintexts - the result of partiallyDecrypt of each ciphertext fed into accumulateCiphertexts
        Returns:
        average of original data