You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: lib.rs
    path of file: ./repos/diem/language/move-prover/interpreter/crypto/src
    
    the code of the file until where you have to start completion: // Copyright (c) The Diem Core Contributors
// SPDX-License-Identifier: Apache-2.0

//! This file duplicates the code in the diem-crypto crate to support
//! - native function implementation for the stackless bytecode interpreter, and
//! - decoupling of Move crates from Diem crates.

    
fn validate_public_key(bytes: &[u8]) -> bool {
    // We need to access the Edwards point which is not directly accessible from
    // ed25519_dalek::PublicKey, so we need to do some custom deserialization.
    if bytes.len() != ED25519_PUBLIC_KEY_LENGTH {
        return false;
    }

    let mut bits = [0u8; ED25519_PUBLIC_KEY_LENGTH];
    bits.copy_from_slice(&bytes[..ED25519_PUBLIC_KEY_LENGTH]);

    let compressed = curve25519_dalek::edwards::CompressedEdwardsY(bits);
    let point = match compressed.decompress() {
        None => return false,
        Some(point) => point,
    };

    // Check if the point lies on a small subgroup. This is required
    // when using curves with a small cofactor (in ed25519, cofactor = 8).
    !point.is_small_order()
}