Module functional_encryption 

Functional Encryption (FE) primitives

Functional encryption allows a client with a secret key SK_f to learn f(x) from an encryption of x, without learning anything else about x. This is useful for privacy-preserving computation where you want to compute on encrypted data.

This module implements Inner Product Functional Encryption (IPFE), one of the most practical forms of FE, allowing computation of inner products over encrypted vectors.

Example

use chie_crypto::functional_encryption::*;

// Setup master keys for vectors of length 3
let (msk, mpk) = ipfe_setup(3);

// Encrypt a vector [5, 10, 15]
let plaintext = vec![5, 10, 15];
let ciphertext = ipfe_encrypt(&mpk, &plaintext).unwrap();

// Generate a functional key for computing inner product with [1, 2, 3]
let func_vector = vec![1, 2, 3];
let func_key = ipfe_keygen(&msk, &func_vector).unwrap();

// Decrypt to get the inner product: 5*1 + 10*2 + 15*3 = 70
let result = ipfe_decrypt(&func_key, &ciphertext).unwrap();
assert_eq!(result, 70);

Structs

IpfeCiphertext

Ciphertext for IPFE

IpfeFunctionalKey

Functional secret key for computing inner products

IpfeMasterPublicKey

Master public key for IPFE

IpfeMasterSecretKey

Master secret key for IPFE

MultiClientIpfe

Multi-client IPFE setup for privacy-preserving aggregation

Enums

FunctionalEncryptionError

Functional encryption error types

Functions

ipfe_decrypt

Decrypt a ciphertext using a functional key to compute the inner product

ipfe_encrypt

Encrypt a plaintext vector using the master public key

ipfe_keygen

Generate a functional secret key for computing inner product with a given vector

ipfe_setup

Generate master secret and public keys for IPFE

Type Aliases

FunctionalEncryptionResult

Result type for functional encryption operations