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use crypto_mac::{Mac, MacResult};
use hmac::{Hmac};
use crate::{Error, JsonObject, JsonValue, parse_required_header_param, Result, Signer, Verifier};
type HmacSha256 = Hmac<sha2::Sha256>;
type HmacSha384 = Hmac<sha2::Sha384>;
type HmacSha512 = Hmac<sha2::Sha512>;
#[derive(Clone, Debug)]
pub struct HmacVerifier<Key: AsRef<[u8]>> {
key: Key,
}
#[derive(Clone, Debug)]
pub struct Hs256Signer<Key: AsRef<[u8]>> {
key: Key,
}
#[derive(Clone, Debug)]
pub struct Hs384Signer<Key: AsRef<[u8]>> {
key: Key,
}
#[derive(Clone, Debug)]
pub struct Hs512Signer<Key: AsRef<[u8]>> {
key: Key,
}
impl<K: AsRef<[u8]>> HmacVerifier<K> {
pub fn new(key: K) -> Self {
Self{key}
}
}
impl<K: AsRef<[u8]>> Hs256Signer<K> {
pub fn new(key: K) -> Self {
Self{key}
}
}
impl<K: AsRef<[u8]>> Hs384Signer<K> {
pub fn new(key: K) -> Self {
Self{key}
}
}
impl<K: AsRef<[u8]>> Hs512Signer<K> {
pub fn new(key: K) -> Self {
Self{key}
}
}
impl<K: AsRef<[u8]>> Verifier for HmacVerifier<K> {
fn verify(&self, protected_header: Option<&JsonObject>, unprotected_header: Option<&JsonObject>, encoded_header: &[u8], encoded_payload: &[u8], signature: &[u8]) -> Result<()> {
let algorithm : &str = parse_required_header_param(protected_header, unprotected_header, "alg")?;
match algorithm {
"HS256" => verify_mac(encoded_header, encoded_payload, signature, HmacSha256::new_varkey(self.key.as_ref()).unwrap()),
"HS384" => verify_mac(encoded_header, encoded_payload, signature, HmacSha384::new_varkey(self.key.as_ref()).unwrap()),
"HS512" => verify_mac(encoded_header, encoded_payload, signature, HmacSha512::new_varkey(self.key.as_ref()).unwrap()),
_ => Err(Error::unsupported_mac_algorithm(algorithm.to_string())),
}
}
}
impl<K: AsRef<[u8]>> Signer for Hs256Signer<K> {
fn set_header_params(&self, header: &mut JsonObject) {
header.insert("alg".to_string(), JsonValue::from("HS256"));
}
fn compute_mac(&self, encoded_header: &[u8], encoded_payload: &[u8]) -> Result<Vec<u8>> {
let hmac = HmacSha256::new_varkey(self.key.as_ref()).unwrap();
Ok(compute_mac(encoded_header, encoded_payload, hmac).code().as_slice().to_owned())
}
}
impl<K: AsRef<[u8]>> Signer for Hs384Signer<K> {
fn set_header_params(&self, header: &mut JsonObject) {
header.insert("alg".to_string(), JsonValue::from("HS384"));
}
fn compute_mac(&self, encoded_header: &[u8], encoded_payload: &[u8]) -> Result<Vec<u8>> {
let hmac = HmacSha384::new_varkey(self.key.as_ref()).unwrap();
Ok(compute_mac(encoded_header, encoded_payload, hmac).code().as_slice().to_owned())
}
}
impl<K: AsRef<[u8]>> Signer for Hs512Signer<K> {
fn set_header_params(&self, header: &mut JsonObject) {
header.insert("alg".to_string(), JsonValue::from("HS512"));
}
fn compute_mac(&self, encoded_header: &[u8], encoded_payload: &[u8]) -> Result<Vec<u8>> {
let hmac = HmacSha512::new_varkey(self.key.as_ref()).unwrap();
Ok(compute_mac(encoded_header, encoded_payload, hmac).code().as_slice().to_owned())
}
}
fn feed_mac(encoded_header: &[u8], encoded_payload: &[u8], mac: &mut impl Mac) {
mac.reset();
mac.input(encoded_header);
mac.input(b".");
mac.input(encoded_payload);
}
fn compute_mac<M: Mac>(encoded_header: &[u8], encoded_payload: &[u8], mut mac: M) -> MacResult<M::OutputSize> {
feed_mac(encoded_header, encoded_payload, &mut mac);
mac.result()
}
fn verify_mac<M: Mac>(encoded_header: &[u8], encoded_payload: &[u8], signature: &[u8], mut mac: M) -> Result<()> {
feed_mac(encoded_header, encoded_payload, &mut mac);
mac.verify(signature).map_err(|_| Error::invalid_signature(""))
}
#[cfg(test)]
mod test {
use super::*;
use crate::{compact, json_object};
use serde_json::json;
const RFC7515_A1_ENCODED : &[u8] = b"eyJ0eXAiOiJKV1QiLA0KICJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFtcGxlLmNvbS9pc19yb290Ijp0cnVlfQ.dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk";
const RFC7515_A1_ENCODED_MANGLED : &[u8] = b"eyJ0eXAiOiJKV1QiLA0KICJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJqc2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFtcGxlLmNvbS9pc19yb290Ijp0cnVlfQ.dBjftJeZ4CVP-mB92K27uhbUJU1p1r_wW1gFWFOEjXk";
const RFC7515_A1_KEY : &[u8] = &[3, 35, 53, 75, 43, 15, 165, 188, 131, 126, 6, 101, 119, 123, 166, 143, 90, 179, 40, 230, 240, 84, 201, 40, 169, 15, 132, 178, 210, 80, 46, 191, 211, 251, 90, 146, 210, 6, 71, 239, 150, 138, 180, 195, 119, 98, 61, 34, 61, 46, 33, 114, 5, 46, 79, 8, 192, 205, 154, 245, 103, 208, 128, 163];
#[test]
fn test_decode_verify() {
let message = compact::decode_verify(RFC7515_A1_ENCODED, &HmacVerifier::new(RFC7515_A1_KEY)).unwrap();
assert_eq!(message.header, json_object!{
"alg": "HS256",
"typ": "JWT",
});
assert_eq!(message.parse_json_value().unwrap(), json!({
"iss": "joe",
"exp": 1300819380,
"http://example.com/is_root": true,
}));
}
#[test]
fn test_decode_verify_invalid() {
let result = compact::decode_verify(RFC7515_A1_ENCODED_MANGLED, &HmacVerifier::new(RFC7515_A1_KEY));
assert_eq!(result.err().unwrap().kind(), Error::InvalidSignature);
}
#[test]
fn test_encode_sign_hmac_sha2() {
let header = json_object!{"typ": "JWT"};
let signed_hs256 = compact::encode_sign(header.clone(), b"foo", &Hs256Signer::new(b"secretkey")).expect("sign HS256 failed");
let signed_hs384 = compact::encode_sign(header.clone(), b"foo", &Hs384Signer::new(b"secretkey")).expect("sign HS384 failed");
let signed_hs512 = compact::encode_sign(header.clone(), b"foo", &Hs512Signer::new(b"secretkey")).expect("sign HS512 failed");
let decoded_hs256 = compact::decode_verify(signed_hs256.as_bytes(), &HmacVerifier::new(&b"secretkey"[..])).expect("decode_verify HS256 failed");
let decoded_hs384 = compact::decode_verify(signed_hs384.as_bytes(), &HmacVerifier::new(&b"secretkey"[..])).expect("decode_verify HS384 failed");
let decoded_hs512 = compact::decode_verify(signed_hs512.as_bytes(), &HmacVerifier::new(&b"secretkey"[..])).expect("decode_verify HS512 failed");
assert_eq!(decoded_hs256.payload, b"foo");
assert_eq!(decoded_hs384.payload, b"foo");
assert_eq!(decoded_hs512.payload, b"foo");
assert_eq!(decoded_hs256.header, json_object!{"typ": "JWT", "alg": "HS256"});
assert_eq!(decoded_hs384.header, json_object!{"typ": "JWT", "alg": "HS384"});
assert_eq!(decoded_hs512.header, json_object!{"typ": "JWT", "alg": "HS512"});
assert_eq!(compact::decode_verify(signed_hs256.as_bytes(), &HmacVerifier::new(&b"notthekey"[..])).err().unwrap().kind(), Error::InvalidSignature);
assert_eq!(compact::decode_verify(signed_hs384.as_bytes(), &HmacVerifier::new(&b"notthekey"[..])).err().unwrap().kind(), Error::InvalidSignature);
assert_eq!(compact::decode_verify(signed_hs512.as_bytes(), &HmacVerifier::new(&b"notthekey"[..])).err().unwrap().kind(), Error::InvalidSignature);
assert_eq!(signed_hs256.data(), "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.Zm9v.4o4hfsHG_tN4bMqxCi0CYt-OArTTogFmgZuN54HS7ZY");
assert_eq!(signed_hs384.data(), "eyJhbGciOiJIUzM4NCIsInR5cCI6IkpXVCJ9.Zm9v.OoAr5wyN5KnBRY0OFYCqsk1mHrxuR_Lot33HVV43udouF1wlD1lvXL2oINrGU-9v");
assert_eq!(signed_hs512.data(), "eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.Zm9v.Al1_vJpGnm78IRKDm48NkAoYkpR4KE1hA5jN09_QnGktPKgP4QB7MJnXgeXuC5E6BVlOp7oaR-FSphbq206vxA");
}
}