Function load_encrypted_key 

pub fn load_encrypted_key(
    path: &Path,
    passphrase: &str,
) -> Result<PrivateKey, AnvilError>

Loads a passphrase-protected key file with the supplied passphrase.

Use this after receiving IdentityResolution::Encrypted and prompting the user with rpassword (or equivalent) in the CLI layer.

Errors

Returns an error if the passphrase is wrong or the file cannot be read.