Uses old Rust 2015
1.0.0 |
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#24 in #rsa-key
40KB
697 lines
jsonwebtoken
Installation
Add the following to Cargo.toml:
jsonwebtoken = "6"
serde_derive = "1"
serde = "1"
Help wanted for v7
v6 was released as a stopgap version to update Ring and add a couple of features like ES256/384. The results are not very ergonomic once we factor in all the possible ways to load a RSA key for example. A possible solution is to have decoder types as described in https://github.com/Keats/jsonwebtoken/issues/76 but I currently do not have the time to implement it myself. I will take any better idea as well of course!
How to use
Complete examples are available in the examples directory: a basic one and one with a custom header.
In terms of imports and structs:
extern crate jsonwebtoken as jwt;
#[macro_use]
extern crate serde_derive;
use jwt::{encode, decode, Header, Algorithm, Validation};
/// Our claims struct, it needs to derive `Serialize` and/or `Deserialize`
#[derive(Debug, Serialize, Deserialize)]
struct Claims {
sub: String,
company: String,
exp: usize,
}
Encoding
The default algorithm is HS256.
let token = encode(&Header::default(), &my_claims, "secret".as_ref())?;
Custom headers & changing algorithm
All the parameters from the RFC are supported but the default header only has typ
and alg
set.
If you want to set the kid
parameter or change the algorithm for example:
let mut header = Header::default();
header.kid = Some("blabla".to_owned());
header.alg = Algorithm::HS512;
let token = encode(&header, &my_claims, "secret".as_ref())?;
Look at examples/custom_header.rs
for a full working example.
Decoding
let token = decode::<Claims>(&token, "secret".as_ref(), &Validation::default())?;
// token is a struct with 2 params: header and claims
decode
can error for a variety of reasons:
- the token or its signature is invalid
- error while decoding base64 or the result of decoding base64 is not valid UTF-8
- validation of at least one reserved claim failed
In some cases, for example if you don't know the algorithm used, you will want to only decode the header:
let header = decode_header(&token)?;
This does not perform any validation on the token.
Validation
This library validates automatically the exp
and nbf
claims if present. You can also validate the sub
, iss
and aud
but
those require setting the expected value in the Validation
struct.
Since validating time fields is always a bit tricky due to clock skew,
you can add some leeway to the iat
, exp
and nbf
validation by setting a leeway
parameter.
Last but not least, you will need to set the algorithm(s) allowed for this token if you are not using HS256
.
use jsonwebtoken::{Validation, Algorithm};
// Default validation: the only algo allowed is HS256
let validation = Validation::default();
// Quick way to setup a validation where only the algorithm changes
let validation = Validation::new(Algorithm::HS512);
// Adding some leeway (in seconds) for exp and nbf checks
let mut validation = Validation {leeway: 60, ..Default::default()};
// Checking issuer
let mut validation = Validation {iss: Some("issuer".to_string()), ..Default::default()};
// Setting audience
let mut validation = Validation::default();
validation.set_audience(&"Me"); // string
validation.set_audience(&["Me", "You"]); // array of strings
Algorithms
This library currently supports the following:
- HS256
- HS384
- HS512
- RS256
- RS384
- RS512
- ES256
- ES384
RSA
jsonwebtoken
can only read DER encoded keys currently. If you have openssl installed,
you can run the following commands to obtain the DER keys from PKCS#1 (ie with BEGIN RSA PUBLIC KEY
) .pem.
If you have a PKCS#8 pem file (ie starting with BEGIN PUBLIC KEY
), you will need to first convert it to PKCS#1:
openssl rsa -pubin -in <filename> -RSAPublicKey_out -out <filename>
.
// private key
$ openssl rsa -in private_rsa_key.pem -outform DER -out private_rsa_key.der
// public key
$ openssl rsa -in private_rsa_key.der -inform DER -RSAPublicKey_out -outform DER -out public_key.der
If you are getting an error with your public key, make sure you get it by using the command above to ensure it is in the right format.
Dependencies
~7–10MB
~278K SLoC