use crypto::{curve25519, salsa20};
use super::{KeyPair,Public, Secret, Error};
use super::XSALSA20_NONCE_BYTES;
use super::crypto_secretbox as secretbox;
const SECRET_KEY_BYTES: usize = 32usize;
pub fn gen_keypair() -> KeyPair<Secret, Public> {
KeyPair::<Secret, Public>::generate_keypair().unwrap()
}
pub fn gen_keypair_from_secret(secret: &[u8;32])-> KeyPair<Secret,Public>{
KeyPair::<Secret, Public>::from_secret_slice(secret).unwrap()
}
pub fn precompute(pk:&Public, sk: &Secret)->[u8;SECRET_KEY_BYTES]{
let zeros = [0u8;16];
let mut first_key = [0u8;32];
let shared =curve25519::curve25519(sk.as_ref(), pk.as_ref());
salsa20::hsalsa20(&shared, &zeros, &mut first_key);
first_key
}
pub fn seal(msg: &[u8], nonce: &[u8;XSALSA20_NONCE_BYTES], their_public: &Public,
our_secret: &Secret) -> Result< Vec<u8>, Error>
{
let key = precompute(their_public, our_secret);
secretbox::seal(msg, nonce, &key)
}
pub fn open(cipher: &[u8], nonce: &[u8;XSALSA20_NONCE_BYTES], their_public: &Public, our_secret: &Secret)
-> Result< Vec<u8>, Error>
{
let shared_key = precompute(their_public, our_secret);
secretbox::open(cipher, nonce, &shared_key)
}
#[cfg(test)]
mod test{
use super::*;
const ALICESK: [u8;32] =
[
0x77,0x07,0x6d,0x0a,0x73,0x18,0xa5,0x7d
,0x3c,0x16,0xc1,0x72,0x51,0xb2,0x66,0x45
,0xdf,0x4c,0x2f,0x87,0xeb,0xc0,0x99,0x2a
,0xb1,0x77,0xfb,0xa5,0x1d,0xb9,0x2c,0x2a
];
const BOBSK: [u8;32]=
[
0x5d,0xab,0x08,0x7e,0x62,0x4a,0x8a,0x4b
,0x79,0xe1,0x7f,0x8b,0x83,0x80,0x0e,0xe6
,0x6f,0x3b,0xb1,0x29,0x26,0x18,0xb6,0xfd
,0x1c,0x2f,0x8b,0x27,0xff,0x88,0xe0,0xeb
];
const DJB_SUBKEY: [u8;32] =
[
0x1b,0x27,0x55,0x64,0x73,0xe9,0x85,0xd4
,0x62,0xcd,0x51,0x19,0x7a,0x9a,0x46,0xc7
,0x60,0x09,0x54,0x9e,0xac,0x64,0x74,0xf2
,0x06,0xc4,0xee,0x08,0x44,0xf6,0x83,0x89
];
const DJB_NONCE: [u8;24]=
[
0x69,0x69,0x6e,0xe9,0x55,0xb6,0x2b,0x73
,0xcd,0x62,0xbd,0xa8,0x75,0xfc,0x73,0xd6
,0x82,0x19,0xe0,0x03,0x6b,0x7a,0x0b,0x37
];
#[test]
fn test_precompute(){
use super::super::traits::FromUnsafeSlice;
let bob_pk = Public::from_unsafe_secret_slice(&BOBSK).unwrap();
let alice_sk = Secret::from_unsafe_slice(&ALICESK).unwrap();
let fk = precompute(&bob_pk, &alice_sk);
assert_eq!(fk, DJB_SUBKEY);
}
#[test]
fn test_seal_open(){
let djb_sample =
vec![
0xbe,0x07,0x5f,0xc5,0x3c,0x81,0xf2,0xd5
,0xcf,0x14,0x13,0x16,0xeb,0xeb,0x0c,0x7b
,0x52,0x28,0xc5,0x2a,0x4c,0x62,0xcb,0xd4
,0x4b,0x66,0x84,0x9b,0x64,0x24,0x4f,0xfc
,0xe5,0xec,0xba,0xaf,0x33,0xbd,0x75,0x1a
,0x1a,0xc7,0x28,0xd4,0x5e,0x6c,0x61,0x29
,0x6c,0xdc,0x3c,0x01,0x23,0x35,0x61,0xf4
,0x1d,0xb6,0x6c,0xce,0x31,0x4a,0xdb,0x31
,0x0e,0x3b,0xe8,0x25,0x0c,0x46,0xf0,0x6d
,0xce,0xea,0x3a,0x7f,0xa1,0x34,0x80,0x57
,0xe2,0xf6,0x55,0x6a,0xd6,0xb1,0x31,0x8a
,0x02,0x4a,0x83,0x8f,0x21,0xaf,0x1f,0xde
,0x04,0x89,0x77,0xeb,0x48,0xf5,0x9f,0xfd
,0x49,0x24,0xca,0x1c,0x60,0x90,0x2e,0x52
,0xf0,0xa0,0x89,0xbc,0x76,0x89,0x70,0x40
,0xe0,0x82,0xf9,0x37,0x76,0x38,0x48,0x64
,0x5e,0x07,0x05
];
let djb_encrypted =
vec![
0xf3,0xff,0xc7,0x70,0x3f,0x94,0x00,0xe5
,0x2a,0x7d,0xfb,0x4b,0x3d,0x33,0x05,0xd9
,0x8e,0x99,0x3b,0x9f,0x48,0x68,0x12,0x73
,0xc2,0x96,0x50,0xba,0x32,0xfc,0x76,0xce
,0x48,0x33,0x2e,0xa7,0x16,0x4d,0x96,0xa4
,0x47,0x6f,0xb8,0xc5,0x31,0xa1,0x18,0x6a
,0xc0,0xdf,0xc1,0x7c,0x98,0xdc,0xe8,0x7b
,0x4d,0xa7,0xf0,0x11,0xec,0x48,0xc9,0x72,
0x71,0xd2,0xc2,0x0f,0x9b,0x92,0x8f,0xe2
,0x27,0x0d,0x6f,0xb8,0x63,0xd5,0x17,0x38
,0xb4,0x8e,0xee,0xe3,0x14,0xa7,0xcc,0x8a
,0xb9,0x32,0x16,0x45,0x48,0xe5,0x26,0xae
,0x90,0x22,0x43,0x68,0x51,0x7a,0xcf,0xea
,0xbd,0x6b,0xb3,0x73,0x2b,0xc0,0xe9,0xda
,0x99,0x83,0x2b,0x61,0xca,0x01,0xb6,0xde
,0x56,0x24,0x4a,0x9e,0x88,0xd5,0xf9,0xb3
,0x79,0x73,0xf6,0x22,0xa4,0x3d,0x14,0xa6
,0x59,0x9b,0x1f,0x65,0x4c,0xb4,0x5a,0x74
,0xe3,0x55,0xa5
];
let akp = KeyPair::<Secret,Public>::from_secret_slice(&ALICESK).unwrap();
let bkp = KeyPair::<Secret,Public>::from_secret_slice(&BOBSK).unwrap();
let encrypt = seal(&djb_sample.as_slice(), &DJB_NONCE, bkp.public(), akp.secret());
let encrypt = encrypt.unwrap();
assert_eq!(encrypt, djb_encrypted);
let plain = open(&djb_encrypted, &DJB_NONCE, akp.public(), bkp.secret());
let plain = plain.unwrap();
assert_eq!(plain, djb_sample);
}
use super::super::gen_nonce;
#[test]
fn test_encrypt_decrypt(){
let bkp = gen_keypair();
let akp = gen_keypair();
let msg = b"The grapes of wrath!";
let nonce = gen_nonce();
let encrypt = seal(msg, &nonce, bkp.public(), akp.secret()).unwrap();
let plain = open(&encrypt, &nonce, akp.public(), bkp.secret()).unwrap();
assert_eq!(plain, b"The grapes of wrath!");
assert_ne!(plain, b"The grapes of wrath");
}
}