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//! Utilies related with crack formats parsed by john and hashcat
//! used by asreproast and kerberoast

use kerberos_asn1::{AsRep, Ticket};
use kerberos_constants::etypes;

/// Available output formats for crackable hashes
#[derive(Debug, PartialEq, Clone, Copy)]
pub enum CrackFormat
{
	Hashcat,
	John,
}

pub fn as_rep_to_crack_string(username: &str, as_rep: &AsRep, crack_format: CrackFormat) -> String
{
	let etype = as_rep.enc_part.etype;
	let realm = &as_rep.crealm;

	let (salt, ciphertext) = divide_salt_and_ciphertext(etype, as_rep.enc_part.cipher.to_vec());
	let salt_hexa = arr_u8_to_hexa_string(&salt);
	let cipher_hexa = arr_u8_to_hexa_string(&ciphertext);

	match crack_format
	{
		CrackFormat::Hashcat => format!("$krb5asrep${}${}@{}:{}${}", etype, username, realm, salt_hexa, cipher_hexa),
		CrackFormat::John => format!("$krb5asrep${}@{}:{}${}", username, realm, salt_hexa, cipher_hexa),
	}
}

pub fn tgs_to_crack_string(username: &str, service: &str, ticket: &Ticket, crack_format: CrackFormat) -> String
{
	let user = username;
	let serv = service.replace(':', "~");
	let etype = ticket.enc_part.etype;
	let realm = &ticket.realm;
	let (salt, ciphertext) = divide_salt_and_ciphertext(etype, ticket.enc_part.cipher.to_vec());

	let salt_hexa = arr_u8_to_hexa_string(&salt);
	let cipher_hexa = arr_u8_to_hexa_string(&ciphertext);

	match crack_format
	{
		CrackFormat::Hashcat => match etype
		{
			etypes::AES128_CTS_HMAC_SHA1_96 | etypes::AES256_CTS_HMAC_SHA1_96 =>
			{
				format!("$krb5tgs${}${}${}$*{}*${}${}", etype, user, realm, serv, salt_hexa, cipher_hexa)
			},
			_ => format!("$krb5tgs${}$*{}${}${}*${}${}", etype, user, realm, serv, salt_hexa, cipher_hexa),
		},
		CrackFormat::John => format!("$krb5tgs${}@{}${}:{}${}", user, realm, serv, salt_hexa, cipher_hexa),
	}
}

fn divide_salt_and_ciphertext(etype: i32, cipher: Vec<u8>) -> (Vec<u8>, Vec<u8>)
{
	let mut salt;
	let mut ciphertext;
	if etype == etypes::AES128_CTS_HMAC_SHA1_96 || etype == etypes::AES256_CTS_HMAC_SHA1_96
	{
		let index = cipher.len() - 12;
		ciphertext = cipher;
		salt = ciphertext.drain(index..).collect();
	}
	else
	{
		salt = cipher;
		ciphertext = salt.drain(16..).collect();
	}

	(salt, ciphertext)
}

fn arr_u8_to_hexa_string(array: &[u8]) -> String
{
	let mut hexa_string = String::new();
	for item in array.iter()
	{
		hexa_string.push_str(&format!("{:02x}", item));
	}
	hexa_string
}