Recover the public key derived from the private key used to sign a message.
Returns a Result to let the caller choose an error handling strategy.

Additional Information

Follows the Secp256r1 elliptical curve.

Arguments

• signature: [B512] - The signature generated by signing a message hash.
• msg_hash: [b256] - The signed data.

Returns

• [Result<B512, EcRecoverError>] - The recovered public key or an error.

Examples

use std::{ecr::ec_recover_r1, b512::B512};

fn foo() {
    let hi = 0xbd0c9b8792876712afadbff382e1bf31c44437823ed761cc3600d0016de511ac;
    let lo = 0x44ac566bd156b4fc71a4a4cb2655d3da360c695edb27dc3b64d621e122fea23d;
    let msg_hash = 0x1e45523606c96c98ba970ff7cf9511fab8b25e1bcd52ced30b81df1e4a9c4323;
    let pub_hi = 0xD73A188181464CC84AE267E45041AEF6AB938F278E636AA1D02D3014C1BEF74E;
    let pub_lo = 0x62660ecce5979493fe5684526e8e00875b948e507a89a47096bc84064a175452;
    let signature: B512 = B512::from((hi, lo));
    // A recovered public key pair.
    let public_key = ec_recover_r1(signature, msg_hash).unwrap();

    assert(public_key.bits()[0] == pub_hi);
    assert(public_key.bits()[1] == pub_lo);
}