Function solana_vote_program::vote_state::authorize

pub fn authorize<S: BuildHasher>(
    invoke_context: &InvokeContext<'_>, 
    instruction_context: &InstructionContext, 
    signers: &HashSet<Pubkey, S>, 
    vote_account_index: usize, 
    authorized: &Pubkey, 
    vote_authorize: VoteAuthorize
) -> Result<(), InstructionError>

Authorize the given pubkey to withdraw or sign votes. This may be called multiple times, but will implicitly withdraw authorization from the previously authorized key