Add support to directly provide crypto:PrivateKey and crypto:PublicKey in JWT signature configurations

[ayeshLK]

Purpose

$subject

Fixes: #6514

Examples

Issuing self-signed JWT using crypto:PrivateKey

byte[] privateKeyContent = check io:fileReadBytes("path-to/private.key");
crypto:PrivateKey privateKey = check crypto:decodeRsaPrivateKeyFromContent(privateKeyContent);
jwt:IssuerConfig issuerConfig = {
    username: "John",
    issuer: "wso2",
    audience: ["ballerina", "ballerinaSamples"],
    expTime: 600,
    signatureConfig: {
        config: privateKey
    }
};
string jwt = check jwt:issue(issuerConfig);

Validating self-signed JWT using crypto:PublicKey

byte[] pubicCertContent = check io:fileReadBytes("path-to/public.crt");
crypto:PublicKey publicKey = check crypto:decodeRsaPublicKeyFromContent(pubicCertContent);
jwt:ValidatorConfig validatorConfig = {
    issuer: "wso2",
    audience: ["ballerina", "ballerinaSamples"],
    clockSkew: 60,
    signatureConfig: {
        certFile: publicKey
    }
};
string jwtContent = "xxxxxx";
jwt:Payload result = check jwt:validate(jwtContent, validatorConfig);

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility

[NipunaRanasinghe]

LGTM apart from these minor comments

[NipunaRanasinghe]

@ayeshLK do we have a changelog in this module to be updated?

[ayeshLK]

@ayeshLK do we have a changelog in this module to be updated?

Already updated

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[NipunaRanasinghe]

LGTM