Runtime

To create a runtime, you simply call FheRuntime::new, passing a Params object. You get a params object from compiling an FHE program as we did in our example.

use sunscreen::{
    fhe_program,
    types::{bfv::Signed, Cipher},
    Compiler, FheRuntime, PublicKey
};

#[fhe_program(scheme = "bfv")]
fn noop() {
}

fn main() {
   let app = Compiler::new()
       .fhe_program(noop)
       .compile()
       .unwrap();

    let runtime = FheRuntime::new(app.params()).unwrap();
}

Once you're created a runtime, you can:

• generate public/private keys
• encrypt plaintexts
• run FHE programs
• decrypt ciphertexts

Parameter compatibility

Note that to use artifacts produced by a runtime (e.g. ciphertexts, keys), they must have been produced under a runtime using exactly the same parameters. This situation may have ramifications if you're attempting to re-use ciphertexts across multiple FHE programs; those programs must be compiled with the same set of parameters.