use crate::{
aead,
agreement::{self, Curve, EcKey, UnparsedPublicKey},
digest, hkdf, hmac, rand,
};
use ece::crypto::{Cryptographer, EcKeyComponents, LocalKeyPair, RemotePublicKey};
impl From<crate::Error> for ece::Error {
fn from(_: crate::Error) -> Self {
ece::Error::CryptoError
}
}
pub struct RcCryptoLocalKeyPair {
wrapped: agreement::KeyPair<agreement::Static>,
}
unsafe impl Sync for RcCryptoLocalKeyPair {}
impl RcCryptoLocalKeyPair {
pub fn from_raw_components(components: &EcKeyComponents) -> Result<Self, ece::Error> {
let ec_key = EcKey::new(
Curve::P256,
components.private_key(),
components.public_key(),
);
let priv_key = agreement::PrivateKey::<agreement::Static>::import(&ec_key)?;
let wrapped = agreement::KeyPair::<agreement::Static>::from_private_key(priv_key)?;
Ok(RcCryptoLocalKeyPair { wrapped })
}
pub fn generate_random() -> Result<Self, ece::Error> {
let wrapped = agreement::KeyPair::<agreement::Static>::generate(&agreement::ECDH_P256)?;
Ok(RcCryptoLocalKeyPair { wrapped })
}
fn agree(&self, peer: &RcCryptoRemotePublicKey) -> Result<Vec<u8>, ece::Error> {
let peer_public_key_raw_bytes = &peer.as_raw()?;
let peer_public_key =
UnparsedPublicKey::new(&agreement::ECDH_P256, &peer_public_key_raw_bytes);
self.wrapped
.private_key()
.agree_static(&peer_public_key)?
.derive(|z| Ok(z.to_vec()))
}
}
impl LocalKeyPair for RcCryptoLocalKeyPair {
fn raw_components(&self) -> Result<EcKeyComponents, ece::Error> {
let ec_key = self.wrapped.private_key().export()?;
Ok(EcKeyComponents::new(
ec_key.private_key(),
ec_key.public_key(),
))
}
fn pub_as_raw(&self) -> Result<Vec<u8>, ece::Error> {
let bytes = self.wrapped.public_key().to_bytes()?;
Ok(bytes.to_vec())
}
fn as_any(&self) -> &dyn std::any::Any {
self
}
}
pub struct RcCryptoRemotePublicKey {
raw: Vec<u8>,
}
impl RcCryptoRemotePublicKey {
pub fn from_raw(bytes: &[u8]) -> Result<RcCryptoRemotePublicKey, ece::Error> {
Ok(RcCryptoRemotePublicKey {
raw: bytes.to_owned(),
})
}
}
impl RemotePublicKey for RcCryptoRemotePublicKey {
fn as_raw(&self) -> Result<Vec<u8>, ece::Error> {
Ok(self.raw.to_vec())
}
fn as_any(&self) -> &dyn std::any::Any {
self
}
}
pub(crate) struct RcCryptoCryptographer;
impl Cryptographer for RcCryptoCryptographer {
fn generate_ephemeral_keypair(&self) -> Result<Box<dyn LocalKeyPair>, ece::Error> {
Ok(Box::new(RcCryptoLocalKeyPair::generate_random()?))
}
fn import_key_pair(
&self,
components: &EcKeyComponents,
) -> Result<Box<dyn LocalKeyPair>, ece::Error> {
Ok(Box::new(RcCryptoLocalKeyPair::from_raw_components(
components,
)?))
}
fn import_public_key(&self, raw: &[u8]) -> Result<Box<dyn RemotePublicKey>, ece::Error> {
Ok(Box::new(RcCryptoRemotePublicKey::from_raw(raw)?))
}
fn compute_ecdh_secret(
&self,
remote: &dyn RemotePublicKey,
local: &dyn LocalKeyPair,
) -> Result<Vec<u8>, ece::Error> {
let local_any = local.as_any();
let local = local_any.downcast_ref::<RcCryptoLocalKeyPair>().unwrap();
let remote_any = remote.as_any();
let remote = remote_any
.downcast_ref::<RcCryptoRemotePublicKey>()
.unwrap();
Ok(local.agree(&remote)?)
}
fn hkdf_sha256(
&self,
salt: &[u8],
secret: &[u8],
info: &[u8],
len: usize,
) -> Result<Vec<u8>, ece::Error> {
let salt = hmac::SigningKey::new(&digest::SHA256, &salt);
let mut out = vec![0u8; len];
hkdf::extract_and_expand(&salt, &secret, &info, &mut out)?;
Ok(out)
}
fn aes_gcm_128_encrypt(
&self,
key: &[u8],
iv: &[u8],
data: &[u8],
) -> Result<Vec<u8>, ece::Error> {
let key = aead::SealingKey::new(&aead::AES_128_GCM, key)?;
let nonce = aead::Nonce::try_assume_unique_for_key(&aead::AES_128_GCM, iv)?;
Ok(aead::seal(&key, nonce, aead::Aad::empty(), data)?)
}
fn aes_gcm_128_decrypt(
&self,
key: &[u8],
iv: &[u8],
ciphertext_and_tag: &[u8],
) -> Result<Vec<u8>, ece::Error> {
let key = aead::OpeningKey::new(&aead::AES_128_GCM, key)?;
let nonce = aead::Nonce::try_assume_unique_for_key(&aead::AES_128_GCM, iv)?;
Ok(aead::open(
&key,
nonce,
aead::Aad::empty(),
&ciphertext_and_tag,
)?)
}
fn random_bytes(&self, dest: &mut [u8]) -> Result<(), ece::Error> {
Ok(rand::fill(dest)?)
}
}
pub(crate) fn init() {
ece::crypto::set_cryptographer(&crate::ece_crypto::RcCryptoCryptographer)
.expect("Failed to initialize `ece` cryptographer!")
}
#[cfg(test)]
mod tests {
use super::*;
use ece::*;
fn generate_keys() -> Result<(Box<dyn LocalKeyPair>, Box<dyn LocalKeyPair>)> {
let local_key = RcCryptoLocalKeyPair::generate_random()?;
let remote_key = RcCryptoLocalKeyPair::generate_random()?;
Ok((Box::new(local_key), Box::new(remote_key)))
}
#[allow(clippy::too_many_arguments)]
fn try_encrypt(
private_key: &str,
public_key: &str,
remote_pub_key: &str,
auth_secret: &str,
salt: &str,
pad_length: usize,
rs: u32,
plaintext: &str,
) -> Result<String> {
let private_key = hex::decode(private_key).unwrap();
let public_key = hex::decode(public_key).unwrap();
let ec_key = EcKeyComponents::new(private_key, public_key);
let local_key_pair = RcCryptoLocalKeyPair::from_raw_components(&ec_key)?;
let remote_pub_key = hex::decode(remote_pub_key).unwrap();
let remote_pub_key = RcCryptoRemotePublicKey::from_raw(&remote_pub_key).unwrap();
let auth_secret = hex::decode(auth_secret).unwrap();
let salt = hex::decode(salt).unwrap();
let plaintext = plaintext.as_bytes();
let params = WebPushParams::new(rs, pad_length, salt);
let ciphertext = Aes128GcmEceWebPush::encrypt_with_keys(
&local_key_pair,
&remote_pub_key,
&auth_secret,
&plaintext,
params,
)?;
Ok(hex::encode(ciphertext))
}
fn try_decrypt(
private_key: &str,
public_key: &str,
auth_secret: &str,
payload: &str,
) -> Result<String> {
let private_key = hex::decode(private_key).unwrap();
let public_key = hex::decode(public_key).unwrap();
let ec_key = EcKeyComponents::new(private_key, public_key);
let plaintext = decrypt(
&ec_key,
&hex::decode(auth_secret).unwrap(),
&hex::decode(payload).unwrap(),
)?;
Ok(String::from_utf8(plaintext).unwrap())
}
#[test]
fn test_e2e() {
crate::ensure_initialized();
let (local_key, remote_key) = generate_keys().unwrap();
let plaintext = b"When I grow up, I want to be a watermelon";
let mut auth_secret = vec![0u8; 16];
RcCryptoCryptographer
.random_bytes(&mut auth_secret)
.unwrap();
let remote_public = RcCryptoCryptographer
.import_public_key(&remote_key.pub_as_raw().unwrap())
.unwrap();
let params = WebPushParams::default();
let ciphertext = Aes128GcmEceWebPush::encrypt_with_keys(
&*local_key,
&*remote_public,
&auth_secret,
plaintext,
params,
)
.unwrap();
let decrypted =
Aes128GcmEceWebPush::decrypt(&*remote_key, &auth_secret, &ciphertext).unwrap();
assert_eq!(decrypted, plaintext.to_vec());
}
#[test]
fn test_conv_fn() -> Result<()> {
crate::ensure_initialized();
let (local_key, auth) = generate_keypair_and_auth_secret()?;
let plaintext = b"Mary had a little lamb, with some nice mint jelly";
let mut salt = vec![0u8; 16];
RcCryptoCryptographer.random_bytes(&mut salt)?;
let encoded = encrypt(&local_key.pub_as_raw()?, &auth, &salt, plaintext).unwrap();
let decoded = decrypt(&local_key.raw_components()?, &auth, &encoded)?;
assert_eq!(decoded, plaintext.to_vec());
Ok(())
}
#[test]
fn try_encrypt_ietf_rfc() {
crate::ensure_initialized();
let ciphertext = try_encrypt(
"c9f58f89813e9f8e872e71f42aa64e1757c9254dcc62b72ddc010bb4043ea11c",
"04fe33f4ab0dea71914db55823f73b54948f41306d920732dbb9a59a53286482200e597a7b7bc260ba1c227998580992e93973002f3012a28ae8f06bbb78e5ec0f",
"042571b2becdfde360551aaf1ed0f4cd366c11cebe555f89bcb7b186a53339173168ece2ebe018597bd30479b86e3c8f8eced577ca59187e9246990db682008b0e",
"05305932a1c7eabe13b6cec9fda48882",
"0c6bfaadad67958803092d454676f397",
0,
4096,
"When I grow up, I want to be a watermelon",
).unwrap();
assert_eq!(ciphertext, "0c6bfaadad67958803092d454676f397000010004104fe33f4ab0dea71914db55823f73b54948f41306d920732dbb9a59a53286482200e597a7b7bc260ba1c227998580992e93973002f3012a28ae8f06bbb78e5ec0ff297de5b429bba7153d3a4ae0caa091fd425f3b4b5414add8ab37a19c1bbb05cf5cb5b2a2e0562d558635641ec52812c6c8ff42e95ccb86be7cd");
}
#[test]
fn try_encrypt_rs_24_pad_6() {
crate::ensure_initialized();
let ciphertext = try_encrypt(
"0f28beaf7e27793c03638dc2973a15b0016e1b367cbffda8861ab175f31bce02",
"0430efcb1eb043b805e4e44bab35f82513c33fedb28700f7e568ac8b61e8d835665a51eb6679b2db228a10c0c3fe5077062848d9bb3d60279f93ce35484728aa1f",
"04c0d1a812b291291dd7beee358713c126c589f3633c26d1a201311de036dc10931e4ee142f61921a3ea5864e872a93841a52944e5b3f6accecce8c828fb04a4cd",
"9d7735d8de1962b98394b07ffe287e20",
"ff805030a108e114e6c17fad6186a1a6",
6,
24,
"I am the very model of a modern Major-General, I've information vegetable, animal, and mineral",
).unwrap();
assert_eq!(ciphertext, "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");
}
#[test]
fn try_encrypt_rs_18_pad_31() {
crate::ensure_initialized();
let ciphertext = try_encrypt(
"7830577bafcfc45828da0c40aab09fb227bfeae068aab8c064222acbe6effd34",
"0400b833e481a99aa330dcb277922d5f84af2e9ce611ad2ad3ed0f5b431912d35ea72fc5bf76b769d9526778f5abfa058650988da5e531ff82d1a7043794c71706",
"04c3d714cb42e2b0a1d6f98599e2f186b8c2ba6f6fab5e09a2abca865c0805892b2c3729330ef83dc9df4b44362b039a0609d36beb9321a431ec123506ddd90f24",
"e4d7b79decdede12c3e9d90d3e05730f",
"e49888d2b28f277f847bc5de96f0f81b",
31,
18,
"Push the button, Frank!",
).unwrap();
assert_eq!(ciphertext, "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");
}
#[test]
fn test_decrypt_rs_24_pad_0() {
crate::ensure_initialized();
let plaintext = try_decrypt(
"c899d11d32e2b7e6fe7498786f50f23b98ace5397ad261de39ba6449ecc12cad",
"04b3fc72e4365cbeb5c78862396eb5e66fd905b483a1b3eac04695f4b802e5b493c5e3b70eb427b6c728b2b204fc255fa218cb45f34d235242705e0d1ea87236e0",
"996fad8b50aa2d02b83f26412b2e2aee",
"495ce6c8de93a4539e862e8634993cbb0000001841043c3378a2c0ab954e1498718e85f08bb723fb7d25e135a663fe385884eb8192336bf90a54ed720f1c045c0b405e9bbc3a2142b16c89086734c374ebaf7099e6427e2d32c8ada5018703c54b10b481e1027d7209d8c6b43553fa133afa597f2ddc45a5ba8140944e6490bb8d6d99ba1d02e60d95f48ce644477c17231d95b97a4f95dd"
).unwrap();
assert_eq!(plaintext, "I am the walrus");
}
#[test]
fn test_decrypt_rs_49_pad_84_ciphertext_len_falls_on_record_boundary() {
crate::ensure_initialized();
let plaintext = try_decrypt(
"67004a4ea820deed8e49db5e9480e63d3ea3cce1ae8e1a60609713d527d001ef",
"04014e8f14b92da07ce083b93f96367e87b217a47f7ef2ee93a9d343aa063e575a9f30d59c690c6a39b3fc815b150ca7dd149601741337b53507a51f41b173a721",
"95f17570e508ef6a2b2ad1b4f5cade33",
"fb2883cec1c4fcadd6d1371f6ea491e00000003141042d441ee7f9ff6a0329a64927d0524fdbe7b22c6fb65e10ab4fdc038f94420a0ca3fa28dad36c84ec91a162eae078faad2c1ced78de8113e19602b20e894f4976b973e2fcf682fa0c8ccd9af3d5bff1ede16fad5a31ce19d38b5e1fe1f78a4fad842bbc10254c2c6cdd96a2b55284d972c53cad8c3bacb10f5f57eb0d4a4333b604102ba117cae29108fbd9f629a8ba6960dd01945b39ed37ba706c434a10fd2bd2094ff9249bcdad45135f5fe45fcd38071f8b2d3941afda439810d77aacaf7ce50b54325bf58c9503337d073785a323dfa343"
).unwrap();
assert_eq!(plaintext, "Hello, world");
}
#[test]
fn test_decrypt_ietf_rfc() {
crate::ensure_initialized();
let plaintext = try_decrypt(
"ab5757a70dd4a53e553a6bbf71ffefea2874ec07a6b379e3c48f895a02dc33de",
"042571b2becdfde360551aaf1ed0f4cd366c11cebe555f89bcb7b186a53339173168ece2ebe018597bd30479b86e3c8f8eced577ca59187e9246990db682008b0e",
"05305932a1c7eabe13b6cec9fda48882",
"0c6bfaadad67958803092d454676f397000010004104fe33f4ab0dea71914db55823f73b54948f41306d920732dbb9a59a53286482200e597a7b7bc260ba1c227998580992e93973002f3012a28ae8f06bbb78e5ec0ff297de5b429bba7153d3a4ae0caa091fd425f3b4b5414add8ab37a19c1bbb05cf5cb5b2a2e0562d558635641ec52812c6c8ff42e95ccb86be7cd"
).unwrap();
assert_eq!(plaintext, "When I grow up, I want to be a watermelon");
}
#[test]
fn test_decrypt_rs_18_pad_0() {
crate::ensure_initialized();
let plaintext = try_decrypt(
"27433fab8970b3cb5284b61183efb46286562cd2a7330d8cae960911a5571d0c",
"04515d4326355652399da24b2be9241e633b5cf14faf0cf3a6fd60317b954c0a2f4848548004b27b0cf7480bc810c6bec03a8fb79c8ea00fc8b05e00f8834563ef",
"d65a04df95f2db5e604839f717dcde79",
"7caebdbc20938ee340a946f1bd4f68f100000012410437cfdb5223d9f95eaa02f6ed940ff22eaf05b3622e949dc3ce9f335e6ef9b26aeaacca0f74080a8b364592f2ccc6d5eddd43004b70b91887d144d9fa93f16c3bc7ea68f4fd547a94eca84b16e138a6080177"
).unwrap();
assert_eq!(plaintext, "1");
}
#[test]
fn test_decrypt_missing_header_block() {
crate::ensure_initialized();
let err = try_decrypt(
"1be83f38332ef09681faf3f307b1ff2e10cab78cc7cdab683ac0ee92ac3f6ee1",
"04dba991ca215343f36bdd3e857cafde3d18bf57f1835b2833bad414f0884162051ac96a0b24490037d07cf528e4e18e100a1a64eb744748544bf1e220dabacf2c",
"3471bb98481e02533bf39542bcf3dba4",
"45b74d2b69be9b074de3b35aa87e7c15611d",
)
.unwrap_err();
match err {
Error::HeaderTooShort => {}
_ => panic!("Unexpected error type!"),
};
}
#[test]
fn test_decrypt_truncated_sender_key() {
crate::ensure_initialized();
let err = try_decrypt(
"ce88e8e0b3057a4752eb4c8fa931eb621c302da5ad03b81af459cf6735560cae",
"04a325d99084c40de0ce722a042c448d94a32691721ca79e3cf745e78c69886194b02cea19224176795a9d4dbbb2073af2ccd6fa6f0a4c7c4968556be502a3ba81",
"5c31e0d96d9a139899ac0969d359f740",
"de5b696b87f1a15cb6adebdd79d6f99e000000120100b6bc1826c37c9f73dd6b4859c2b505181952",
)
.unwrap_err();
match err {
Error::InvalidKeyLength => {}
_ => panic!("Unexpected error type!"),
};
}
#[test]
fn test_decrypt_truncated_auth_secret() {
crate::ensure_initialized();
let err = try_decrypt(
"60c7636a517de7039a0ac2d0e3064400794c78e7e049398129a227cee0f9a801",
"04fdd04128a85c05896d7f81fe118bdcb887b9f3c1ff4183adc4c824d128607300e986b2dfb5a610e5af43e408a00730584f93e3dfddfc44737d5f08fb2d6f8916",
"355a38cd6d9bef15990e2d3308dbd600",
"8115f4988b8c392a7bacb43c8f1ac5650000001241041994483c541e9bc39a6af03ff713aa7745c284e138a42a2435b797b20c4b698cf5118b4f8555317c190eabebfab749c164d3f6bdebe0d441719131a357d8890a13c4dbd4b16ff3dd5a83f7c91ad6e040ac42730a7f0b3cd3245e9f8d6ff31c751d410cfd"
).unwrap_err();
match err {
Error::CryptoError => {}
_ => panic!("Unexpected error type!"),
};
}
#[test]
fn test_decrypt_early_final_record() {
crate::ensure_initialized();
let err = try_decrypt(
"5dda1d918bc407ba3cda12cb8014d49aa7e0269002820304466bc80034ca9240",
"04c95c6520dad11e8f6a1bf8031a40c2a4ee1045c1903be06a1dfa7f829cceb2de02481ae6bd0476121b12c5532d0b231788077efa0683a5bfe0d62339b251cb35",
"40c241fde4269ee1e6d725592d982718",
"dbe215507d1ad3d2eaeabeae6e874d8f0000001241047bc4343f34a8348cdc4e462ffc7c40aa6a8c61a739c4c41d45125505f70e9fc5f9efa86852dd488dcf8e8ea2cafb75e07abd5ee7c9d5c038bafef079571b0bda294411ce98c76dd031c0e580577a4980a375e45ed30429be0e2ee9da7e6df8696d01b8ec"
).unwrap_err();
match err {
Error::DecryptPadding => {}
_ => panic!("Unexpected error type!"),
};
}
}