josekit

JOSE (Javascript Object Signing and Encryption: JWT, JWS, JWE, JWA, JWK) library based on OpenSSL for Rust.

Install

[dependencies]
josekit = "0.8.1"

This library depends on OpenSSL 1.1.1 DLL. Read more about Crate openssl.

Build

sudo apt install build-essential pkg-config libssl-dev
cd josekit-rs
cargo build --release

Supported signing algorithms

Name	Description	Key Type
HS256	HMAC using SHA-256	oct (size: 32 bytes or more)
HS384	HMAC using SHA-384	oct (size: 48 bytes or more)
HS512	HMAC using SHA-512	oct (size: 64 bytes or more)
RS256	RSASSA-PKCS1-v1_5 using SHA-256	RSA (size: 1024 bits or more)
RS384	RSASSA-PKCS1-v1_5 using SHA-384
RS512	RSASSA-PKCS1-v1_5 using SHA-512
PS256	RSASSA-PSS using SHA-256 and MGF1 with SHA-256
PS384	RSASSA-PSS using SHA-384 and MGF1 with SHA-384
PS512	RSASSA-PSS using SHA-512 and MGF1 with SHA-512
ES256	ECDSA using P-256 and SHA-256	EC (curve: P-256)
ES384	ECDSA using P-384 and SHA-384	EC (curve: P-384)
ES512	ECDSA using P-521 and SHA-512	EC (curve: P-521)
ES256K	ECDSA using secp256k1 curve and SHA-256	EC (curve: secp256k1)
EdDSA	EdDSA signature algorithms	OKP (curve: Ed25519 or Ed448)
none	No digital signature or MAC performed	-

Supported encryption algorithms

Name	Description	Key Type
dir	Direct use of a shared symmetric key as the CEK	oct (size: the CEK depended. See below) A128CBC-HS256: 32 bytes A192CBC-HS384: 48 bytes A256CBC-HS512: 64 bytes A128GCM: 16 bytes A192GCM: 24 bytes A256GCM: 32 bytes
ECDH-ES	Elliptic Curve Diffie-Hellman Ephemeral Static key agreement using Concat KDF	EC (curve: P-256, P-384, P-521 or secp256k1) OKP (curve: X25519 or X448)
ECDH-ES+A128KW	ECDH-ES using Concat KDF and CEK wrapped with "A128KW"
ECDH-ES+A192KW	ECDH-ES using Concat KDF and CEK wrapped with "A192KW"
ECDH-ES+A256KW	ECDH-ES using Concat KDF and CEK wrapped with "A256KW"
A128KW	AES Key Wrap with default initial value using 128-bit key	oct (size: 16 bytes)
A192KW	AES Key Wrap with default initial value using 192-bit key	oct (size: 24 bytes)
A256KW	AES Key Wrap with default initial value using 256-bit key	oct (size: 32 bytes)
A128GCMKW	Key wrapping with AES GCM using 128-bit key	oct (size: 16 bytes)
A192GCMKW	Key wrapping with AES GCM using 192-bit key	oct (size: 24 bytes)
A256GCMKW	Key wrapping with AES GCM using 256-bit key	oct (size: 32 bytes)
PBES2-HS256+A128KW	PBES2 with HMAC SHA-256 and "A128KW" wrapping	oct (size: 1 bytes or more)
PBES2-HS384+A192KW	PBES2 with HMAC SHA-384 and "A192KW" wrapping
PBES2-HS512+A256KW	PBES2 with HMAC SHA-512 and "A256KW" wrapping
RSA1_5	RSAES-PKCS1-v1_5	RSA (size: 1024 bits or more)
RSA-OAEP	RSAES OAEP using default parameters
RSA-OAEP-256	RSAES OAEP using SHA-256 and MGF1 with SHA-256
RSA-OAEP-384	RSAES OAEP using SHA-384 and MGF1 with SHA-384
RSA-OAEP-512	RSAES OAEP using SHA-512 and MGF1 with SHA-512

Supported key formats

Private Key

Algorithm	JWK	PEM		DER
Algorithm	JWK	PKCS#8	Traditional	PKCS#8	Raw
RSA	OK	OK	OK	OK	OK
RSA-PSS	OK	OK	OK	OK	OK
EC	OK	OK	OK	OK	OK
ED	OK	OK	OK	OK	-
ECX	OK	OK	OK	OK	-

Public Key

Algorithm	JWK	PEM		DER
Algorithm	JWK	SPKI	Traditional	SPKI	Raw
RSA	OK	OK	OK	OK	OK
RSA-PSS	OK	OK	OK	OK	OK
EC	OK	OK	-	OK	-
ED	OK	OK	-	OK	-
ECX	OK	OK	-	OK	-

Usage

Signing a JWT by HMAC

HMAC is used to verify the integrity of a message by common secret key. Three algorithms are available for HMAC: HS256, HS384, and HS512.

You can use any bytes as the key. But the key length must be larger than or equal to the output hash size.

use josekit::{JoseError, jws::{JwsHeader, HS256}, jwt::{self, JwtPayload}};

fn main() -> Result<(), JoseError> {
    let mut header = JwsHeader::new();
    header.set_token_type("JWT");

    let mut payload = JwtPayload::new();
    payload.set_subject("subject");

    let key = b"0123456789ABCDEF0123456789ABCDEF";

    // Signing JWT
    let signer = HS256.signer_from_bytes(key)?;
    let jwt = jwt::encode_with_signer(&payload, &header, &signer)?;

    // Verifing JWT
    let verifier = HS256.verifier_from_bytes(key)?;
    let (payload, header) = jwt::decode_with_verifier(&jwt, &verifier)?;

    Ok(())
}

Signing a JWT by RSASSA

RSASSA is used to verify the integrity of a message by two keys: public and private. Three algorithms are available for RSASSA: RS256, RS384, and RS512.

You can generate the keys by executing openssl command.

# Generate a new private key. Keygen bits must be 2048 or more.
openssl openssl genpkey -algorithm RSA -pkeyopt rsa_keygen_bits:2048 -out private.pem

# Generate a public key from the private key.
openssl pkey -in private.pem -pubout -out public.pem

use josekit::{JoseError, jws::{JwsHeader, RS256}, jwt::{self, JwtPayload}};

const PRIVATE_KEY: &str = concat!(env!("CARGO_MANIFEST_DIR"), 
    "/data/pem/RSA_2048bit_private.pem");
const PUBLIC_KEY: &str = concat!(env!("CARGO_MANIFEST_DIR"), 
    "/data/pem/RSA_2048bit_public.pem");

fn main() -> Result<(), JoseError> {
    let mut header = JwsHeader::new();
    header.set_token_type("JWT");

    let mut payload = JwtPayload::new();
    payload.set_subject("subject");

    // Signing JWT
    let private_key = std::fs::read(PRIVATE_KEY).unwrap();
    let signer = RS256.signer_from_pem(&private_key)?;
    let jwt = jwt::encode_with_signer(&payload, &header, &signer)?;

    // Verifing JWT
    let public_key = std::fs::read(PUBLIC_KEY).unwrap();
    let verifier = RS256.verifier_from_pem(&public_key)?;
    let (payload, header) = jwt::decode_with_verifier(&jwt, &verifier)?;
    
    Ok(())
}

Signing a JWT by RSASSA-PSS

RSASSA-PSS is used to verify the integrity of a message by two keys: public and private.

The raw key format of RSASSA-PSS is the same as RSASSA. So you should use a PKCS#8 wrapped key. It contains some optional attributes.

Three algorithms are available for RSASSA-PSS: PS256, PS384, and PS512. You can generate the keys by executing openssl command.

# Generate a new private key

# for PS256
openssl genpkey -algorithm RSA-PSS -pkeyopt rsa_keygen_bits:2048 -pkeyopt rsa_pss_keygen_md:sha256 -pkeyopt rsa_pss_keygen_mgf1_md:sha256 -pkeyopt rsa_pss_keygen_saltlen:32 -out private.pem

# for PS384
openssl genpkey -algorithm RSA-PSS -pkeyopt rsa_keygen_bits:2048 -pkeyopt rsa_pss_keygen_md:sha384 -pkeyopt rsa_pss_keygen_mgf1_md:sha384 -pkeyopt rsa_pss_keygen_saltlen:48 -out private.pem

# for PS512
openssl genpkey -algorithm RSA-PSS -pkeyopt rsa_keygen_bits:2048 -pkeyopt rsa_pss_keygen_md:sha512 -pkeyopt rsa_pss_keygen_mgf1_md:sha512 -pkeyopt rsa_pss_keygen_saltlen:64 -out private.pem

# Generate a public key from the private key.
openssl pkey -in private.pem -pubout -out public.pem

use josekit::{JoseError, jws::{JwsHeader, PS256}, jwt::{self, JwtPayload}};

const PRIVATE_KEY: &str = concat!(env!("CARGO_MANIFEST_DIR"), 
    "/data/pem/RSA-PSS_2048bit_SHA-256_private.pem");
const PUBLIC_KEY: &str = concat!(env!("CARGO_MANIFEST_DIR"), 
    "/data/pem/RSA-PSS_2048bit_SHA-256_public.pem");

fn main() -> Result<(), JoseError> {
    let mut header = JwsHeader::new();
    header.set_token_type("JWT");

    let mut payload = JwtPayload::new();
    payload.set_subject("subject");

    // Signing JWT
    let private_key = std::fs::read(PRIVATE_KEY).unwrap();
    let signer = PS256.signer_from_pem(&private_key)?;
    let jwt = jwt::encode_with_signer(&payload, &header, &signer)?;

    // Verifing JWT
    let public_key = std::fs::read(PUBLIC_KEY).unwrap();
    let verifier = PS256.verifier_from_pem(&public_key)?;
    let (payload, header) = jwt::decode_with_verifier(&jwt, &verifier)?;

    Ok(())
}

Signing a JWT by ECDSA

ECDSA is used to verify the integrity of a message by two keys: public and private. Four algorithms are available for ECDSA: ES256, ES384, ES512 and ES256K.

You can generate the keys by executing openssl command.

# Generate a new private key

# for ES256
openssl genpkey -algorithm EC -pkeyopt ec_paramgen_curve:P-256 -out private.pem

# for ES384
openssl genpkey -algorithm EC -pkeyopt ec_paramgen_curve:P-384 -out private.pem

# for ES512
openssl genpkey -algorithm EC -pkeyopt ec_paramgen_curve:P-521 -out private.pem

# for ES256K
openssl genpkey -algorithm EC -pkeyopt ec_paramgen_curve:secp256k1 -out private.pem

# Generate a public key from the private key.
openssl pkey -in private.pem -pubout -out public.pem

use josekit::{JoseError, jws::{JwsHeader, ES256}, jwt::{self, JwtPayload}};

const PRIVATE_KEY: &str = concat!(env!("CARGO_MANIFEST_DIR"), 
    "/data/pem/EC_P-256_private.pem");
const PUBLIC_KEY: &str = concat!(env!("CARGO_MANIFEST_DIR"), 
    "/data/pem/EC_P-256_public.pem");

fn main() -> Result<(), JoseError> {
    let mut header = JwsHeader::new();
    header.set_token_type("JWT");

    let mut payload = JwtPayload::new();
    payload.set_subject("subject");

    // Signing JWT
    let private_key = std::fs::read(PRIVATE_KEY).unwrap();
    let signer = ES256.signer_from_pem(&private_key)?;
    let jwt = jwt::encode_with_signer(&payload, &header, &signer)?;

    // Verifing JWT
    let public_key = std::fs::read(PUBLIC_KEY).unwrap();
    let verifier = ES256.verifier_from_pem(&public_key)?;
    let (payload, header) = jwt::decode_with_verifier(&jwt, &verifier)?;

    Ok(())
}

Signing a JWT by EdDSA

EdDSA is used to verify the integrity of a message by two keys: public and private. A algorithm is only available "EdDSA" for EdDSA. But it has two curve types: Ed25519, Ed448.

You can generate the keys by executing openssl command.

# Generate a new private key

# for Ed25519
openssl genpkey -algorithm ED25519 -out private.pem

# for Ed448
openssl genpkey -algorithm ED448 -out private.pem

# Generate a public key from the private key.
openssl pkey -in private.pem -pubout -out public.pem

use josekit::{JoseError, jws::{JwsHeader, EdDSA}, jwt::{self, JwtPayload}};

const PRIVATE_KEY: &str = concat!(env!("CARGO_MANIFEST_DIR"), 
    "/data/pem/ED25519_private.pem");
const PUBLIC_KEY: &str = concat!(env!("CARGO_MANIFEST_DIR"), 
    "/data/pem/ED25519_public.pem");

fn main() -> Result<(), JoseError> {
    let mut header = JwsHeader::new();
    header.set_token_type("JWT");

    let mut payload = JwtPayload::new();
    payload.set_subject("subject");

    // Signing JWT
    let private_key = std::fs::read(PRIVATE_KEY).unwrap();
    let signer = EdDSA.signer_from_pem(&private_key)?;
    let jwt = jwt::encode_with_signer(&payload, &header, &signer)?;

    // Verifing JWT
    let public_key = std::fs::read(PUBLIC_KEY).unwrap();
    let verifier = EdDSA.verifier_from_pem(&public_key)?;
    let (payload, header) = jwt::decode_with_verifier(&jwt, &verifier)?;

    Ok(())
}

Encrypting a JWT by a Direct method

A "Direct" method is used to encrypt a message by CEK (content encryption key). The algorithm name is "dir" only.

You can use any bytes as the key. But the length must be the same as the length of the CEK.

use josekit::{JoseError, jwe::{JweHeader, Dir}, jwt::{self, JwtPayload}};

fn main() -> Result<(), JoseError> {
    let mut header = JweHeader::new();
    header.set_token_type("JWT");
    header.set_content_encryption("A128CBC-HS256");

    let mut payload = JwtPayload::new();
    payload.set_subject("subject");

    let key = b"0123456789ABCDEF0123456789ABCDEF";

    // Encrypting JWT
    let encrypter = Dir.encrypter_from_bytes(key)?;
    let jwt = jwt::encode_with_encrypter(&payload, &header, &encrypter)?;

    // Decrypting JWT
    let decrypter = Dir.decrypter_from_bytes(key)?;
    let (payload, header) = jwt::decode_with_decrypter(&jwt, &decrypter)?;

    Ok(())
}

Encrypting a JWT by ECDH-ES

ECDH-ES is used to encrypt a message a message by random bytes as CEK (content encryption key) and the CEK is delivered safely by two keys: public and private. Four algorithms are available for ECDH-ES: ECDH-ES, ECDH-ES+A128KW, ECDH-ES+A192KW and ECDH-ES+A256KW.

The types of key are available both EC and ECX. The EC key has four curve types: P-256, P-384, P-521 and secp256k1. The ECX key has two curve types: X25519 and X448.

You can generate the keys by executing openssl command.

# Generate a new private key

# for P-256 EC key
openssl genpkey -algorithm EC -pkeyopt ec_paramgen_curve:P-256 -out private.pem

# for P-384 EC key
openssl genpkey -algorithm EC -pkeyopt ec_paramgen_curve:P-384 -out private.pem

# for P-521 EC key
openssl genpkey -algorithm EC -pkeyopt ec_paramgen_curve:P-521 -out private.pem

# for secp256k1 EC key
openssl genpkey -algorithm EC -pkeyopt ec_paramgen_curve:secp256k1 -out private.pem

# for X25519 ECX key
openssl genpkey -algorithm X25519 -out private.pem

# for X448 ECX key
openssl genpkey -algorithm X448 -out private.pem

# Generate a public key from the private key.
openssl pkey -in private.pem -pubout -out public.pem

use josekit::{JoseError, jwe::{JweHeader, ECDH_ES}, jwt::{self, JwtPayload}};

const PRIVATE_KEY: &str = concat!(env!("CARGO_MANIFEST_DIR"), 
    "/data/pem/EC_P-256_private.pem");
const PUBLIC_KEY: &str = concat!(env!("CARGO_MANIFEST_DIR"), 
    "/data/pem/EC_P-256_public.pem");

fn main() -> Result<(), JoseError> {
    let mut header = JweHeader::new();
    header.set_token_type("JWT");
    header.set_content_encryption("A128CBC-HS256");

    let mut payload = JwtPayload::new();
    payload.set_subject("subject");

    // Encrypting JWT
    let public_key = std::fs::read(PUBLIC_KEY).unwrap();
    let encrypter = ECDH_ES.encrypter_from_pem(&public_key)?;
    let jwt = jwt::encode_with_encrypter(&payload, &header, &encrypter)?;

    // Decrypting JWT
    let private_key = std::fs::read(PRIVATE_KEY).unwrap();
    let decrypter = ECDH_ES.decrypter_from_pem(&private_key)?;
    let (payload, header) = jwt::decode_with_decrypter(&jwt, &decrypter)?;

    Ok(())
}

Encrypting a JWT by AESKW

AES is used to encrypt a message by random bytes as CEK (content encryption key) and the CEK is wrapping by common secret key. Three algorithms are available for AES: A128KW, A192KW and A256KW.

You can use any bytes as the key. But the length must be AES key size.

use josekit::{JoseError, jwe::{JweHeader, A128KW}, jwt::{self, JwtPayload}};

fn main() -> Result<(), JoseError> {
    let mut header = JweHeader::new();
    header.set_token_type("JWT");
    header.set_content_encryption("A128CBC-HS256");

    let mut payload = JwtPayload::new();
    payload.set_subject("subject");

    let key = b"0123456789ABCDEF";

    // Encrypting JWT
    let encrypter = A128KW.encrypter_from_bytes(key)?;
    let jwt = jwt::encode_with_encrypter(&payload, &header, &encrypter)?;

    // Decrypting JWT
    let decrypter = A128KW.decrypter_from_bytes(key)?;
    let (payload, header) = jwt::decode_with_decrypter(&jwt, &decrypter)?;
    Ok(())
}

Encrypting a JWT by AES-GCM

AES-GCM is used to encrypt a message by random bytes as CEK (content encryption key) and the CEK is wrapping by common secret key. Three algorithms are available for AES-GCM: A128GCMKW, A192GCMKW and A256GCMKW.

You can use any bytes as the key. But the length must be AES key size.

use josekit::{JoseError, jwe::{JweHeader, A128GCMKW}, jwt::{self, JwtPayload}};

fn main() -> Result<(), JoseError> {
    let mut header = JweHeader::new();
    header.set_token_type("JWT");
    header.set_content_encryption("A128CBC-HS256");

    let mut payload = JwtPayload::new();
    payload.set_subject("subject");

    let key = b"0123456789ABCDEF";

    // Encrypting JWT
    let encrypter = A128GCMKW.encrypter_from_bytes(key)?;
    let jwt = jwt::encode_with_encrypter(&payload, &header, &encrypter)?;

    // Decrypting JWT
    let decrypter = A128GCMKW.decrypter_from_bytes(key)?;
    let (payload, header) = jwt::decode_with_decrypter(&jwt, &decrypter)?;
    Ok(())
}

Encrypting a JWT by PBES2-HMAC+AESKW

PBES2-HMAC+AES is used to encrypt a message by random bytes as CEK (content encryption key) and the CEK is wrapping by common secret key. Three algorithms are available for AES-GCM: PBES2-HS256+A128KW, PBES2-HS384+A192KW and PBES2-HS512+A256KW.

You can use any bytes as the key. But a password is recommended that the length is no shorter than AES key size and no longer than 128 octets.

use josekit::{JoseError, jwe::{JweHeader, PBES2_HS256_A128KW}, jwt::{self, JwtPayload}};

fn main() -> Result<(), JoseError> {
    let mut header = JweHeader::new();
    header.set_token_type("JWT");
    header.set_content_encryption("A128CBC-HS256");

    let mut payload = JwtPayload::new();
    payload.set_subject("subject");

    let key = b"01234567";

    // Encrypting JWT
    let encrypter = PBES2_HS256_A128KW.encrypter_from_bytes(key)?;
    let jwt = jwt::encode_with_encrypter(&payload, &header, &encrypter)?;

    // Decrypting JWT
    let decrypter = PBES2_HS256_A128KW.decrypter_from_bytes(key)?;
    let (payload, header) = jwt::decode_with_decrypter(&jwt, &decrypter)?;
    Ok(())
}

Encrypting a JWT by RSAES

RSAES is used to encrypt a message a message by random bytes as CEK (content encryption key) and the CEK is delivered safely by two keys: public and private. Two algorithms are available for now: RSA1_5, RSA-OAEP.

You can generate the keys by executing openssl command.

# Generate a new private key. Keygen bits must be 2048 or more.
openssl openssl genpkey -algorithm RSA -pkeyopt rsa_keygen_bits:2048 -out private.pem

# Generate a public key from the private key.
openssl pkey -in private.pem -pubout -out public.pem

use josekit::{JoseError, jwe::{JweHeader, RSA_OAEP}, jwt::{self, JwtPayload}};

const PRIVATE_KEY: &str = concat!(env!("CARGO_MANIFEST_DIR"), 
    "/data/pem/RSA_2048bit_private.pem");
const PUBLIC_KEY: &str = concat!(env!("CARGO_MANIFEST_DIR"), 
    "/data/pem/RSA_2048bit_public.pem");

fn main() -> Result<(), JoseError> {
    let mut header = JweHeader::new();
    header.set_token_type("JWT");
    header.set_content_encryption("A128CBC-HS256");

    let mut payload = JwtPayload::new();
    payload.set_subject("subject");

    // Encrypting JWT
    let public_key = std::fs::read(PUBLIC_KEY).unwrap();
    let encrypter = RSA_OAEP.encrypter_from_pem(&public_key)?;
    let jwt = jwt::encode_with_encrypter(&payload, &header, &encrypter)?;

    // Decrypting JWT
    let private_key = std::fs::read(PRIVATE_KEY).unwrap();
    let decrypter = RSA_OAEP.decrypter_from_pem(&private_key)?;
    let (payload, header) = jwt::decode_with_decrypter(&jwt, &decrypter)?;
    Ok(())
}

Unsecured JWT

use josekit::{JoseError, jws::JwsHeader, jwt::{self, JwtPayload}};

fn main() -> Result<(), JoseError> {
    let mut header = JwsHeader::new();
    header.set_token_type("JWT");

    let mut payload = JwtPayload::new();
    payload.set_subject("subject");

    let jwt = jwt::encode_unsecured(&payload, &header)?;
    let (payload, header) = jwt::decode_unsecured(&jwt)?;
    Ok(())
}

Validate payload

use josekit::{JoseError, jwt::{JwtPayload, JwtPayloadValidator}};
use std::time::{Duration, SystemTime};

fn main() -> Result<(), JoseError> {
    let mut validator = JwtPayloadValidator::new();
    // value based validation
    validator.set_issuer("http://example.com");
    validator.set_audience("user1");
    validator.set_jwt_id("550e8400-e29b-41d4-a716-446655440000");

    // time based validation: not_before <= base_time < expires_at
    validator.set_base_time(SystemTime::now() + Duration::from_secs(30));

    // issued time based validation: min_issued_time <= issued_time <= max_issued_time
    validator.set_min_issued_time(SystemTime::now() - Duration::from_secs(48 * 60));
    validator.set_max_issued_time(SystemTime::now() + Duration::from_secs(24 * 60));

    let mut payload = JwtPayload::new();

    validator.validate(&payload)?;

    Ok(())
}

License

Licensed under either of

Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

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josekit

Install

Build

Supported signing algorithms

Supported encryption algorithms

Supported key formats

Private Key

Public Key

Usage

Signing a JWT by HMAC

Signing a JWT by RSASSA

Signing a JWT by RSASSA-PSS

Signing a JWT by ECDSA

Signing a JWT by EdDSA

Encrypting a JWT by a Direct method

Encrypting a JWT by ECDH-ES

Encrypting a JWT by AESKW

Encrypting a JWT by AES-GCM

Encrypting a JWT by PBES2-HMAC+AESKW

Encrypting a JWT by RSAES

Unsecured JWT

Validate payload

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AIDEM-Technologies/josekit-rs

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josekit

Install

Build

Supported signing algorithms

Supported encryption algorithms

Supported key formats

Private Key

Public Key

Usage

Signing a JWT by HMAC

Signing a JWT by RSASSA

Signing a JWT by RSASSA-PSS

Signing a JWT by ECDSA

Signing a JWT by EdDSA

Encrypting a JWT by a Direct method

Encrypting a JWT by ECDH-ES

Encrypting a JWT by AESKW

Encrypting a JWT by AES-GCM

Encrypting a JWT by PBES2-HMAC+AESKW

Encrypting a JWT by RSAES

Unsecured JWT

Validate payload

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