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use crate::Result;

/// Trait implemented by the ciphers of this library
pub trait KerberosCipher {
    fn etype(&self) -> i32;
    fn generate_salt(&self, realm: &str, client_name: &str) -> Vec<u8>;
    fn generate_key(&self, raw_key: &[u8], salt: &[u8]) -> Vec<u8>;
    fn generate_key_from_string(
        &self,
        password: &str,
        salt: &[u8],
    ) -> Vec<u8>;
    fn decrypt(
        &self,
        key: &[u8],
        key_usage: i32,
        ciphertext: &[u8],
    ) -> Result<Vec<u8>>;

    fn generate_key_and_decrypt(
        &self,
        raw_key: &[u8],
        salt: &[u8],
        key_usage: i32,
        ciphertext: &[u8],
    ) -> Result<Vec<u8>> {
        let key = self.generate_key(raw_key, salt);
        return self.decrypt(&key, key_usage, ciphertext);
    }

    fn generate_key_from_string_and_decrypt(
        &self,
        password: &str,
        salt: &[u8],
        key_usage: i32,
        ciphertext: &[u8],
    ) -> Result<Vec<u8>> {
        let key = self.generate_key_from_string(password, salt);
        return self.decrypt(&key, key_usage, ciphertext);
    }

    fn encrypt(&self, key: &[u8], key_usage: i32, plaintext: &[u8]) -> Vec<u8>;

    fn generate_key_and_encrypt(
        &self,
        raw_key: &[u8],
        salt: &[u8],
        key_usage: i32,
        ciphertext: &[u8],
    ) -> Vec<u8> {
        let key = self.generate_key(raw_key, salt);
        return self.encrypt(&key, key_usage, ciphertext);
    }

    fn generate_key_from_string_and_encrypt(
        &self,
        password: &str,
        salt: &[u8],
        key_usage: i32,
        ciphertext: &[u8],
    ) -> Vec<u8> {
        let key = self.generate_key_from_string(password, salt);
        return self.encrypt(&key, key_usage, ciphertext);
    }
}