如何从基板侧的Polkadot地址生成公钥

我正在从PolkadotJS生成一个公钥,如下所示

    const keyring = new Keyring({ type: "sr25519" });
    const account = keyring.addFromUri("//Bob", { name: "Bob default" });
    
    // encoded public key 
    let public_key = keyring.encodeAddress(account.publicKey, 42);
    console.log(public_key);

我正在添加的类型 public_key 像 "public_key": "Vec<u8>",

我正在从Substrate Node读取公钥,如下所示

// pk_raw is a Vec<u8> array 
let pk =  str::from_utf8(pk_raw.as_ref()).unwrap() 
// the above returns `5FHneW46xGXgs5mUiveU4sbTyGBzmstUspZC92UhjJM694ty`

我需要根据这个值生成公钥。我尝试了以下内容

ed25519::Public::try_from(&*pk_raw).unwrap(); 
// above throws error since the data length is not equals to 32

fn try_from(data: &[u8]) -> Result<Self, Self::Error> {
        if data.len() == 32 {
            let mut inner = [0u8; 32];
            inner.copy_from_slice(data);
            Ok(Public(inner))
        } else {
            Err(())
        }
    }

是否有一种方法可以使用生成公钥 5FHneW46xGXgs5mUiveU4sbTyGBzmstUspZC92UhjJM694ty 来自基板锈蚀侧?