Go

Verify JWT with EdDSA / Ed25519 Signature

See more JSON Web Token (JWT) Examples

Note: This example requires Chilkat v9.5.0.84 or greater.

Demonstrates how to verify a JWT that was signed using an Ed25519 private key.

This example verifies the EdDSA signature. It also does the following:

• Checks to see if the time constraints ("nbf" and "exp") are valid.
• Recovers the original JOSE header.
• Recovers the original data.

Go

    success := false

    // Demonstrates how to verify a JWT with an EdDSA/Ed25519 Signature
    // *** Requires Chilkat v9.5.0.84 or greater.

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Use this Ed25519 public key for verification

    jsonPubKey := "{\"kty\": \"OKP\",\"alg\": \"EdDSA\",\"crv\": \"Ed25519\",\"x\": \"11qYAYKxCrfVS_7TyWQHOg7hcvPapiMlrwIaaPcHURo\"}"

    pubKey := chilkat.NewPublicKey()
    success = pubKey.LoadFromString(jsonPubKey)
    if success == false {
        fmt.Println(pubKey.LastErrorText())
        pubKey.DisposePublicKey()
        return
    }

    jwt := chilkat.NewJwt()
    token := "eyJhbGciOiJFZERTQSJ9.RXhhbXBsZSBvZiBFZDI1NTE5IHNpZ25pbmc.hgyY0il_MGCjP0JzlnLWG1PPOt7-09PGcvMg3AIbQR6dWbhijcNR4ki4iylGjg5BhVsPt9g7sVvpAr_MuM0KAg"

    // First verify the signature.
    sigVerified := jwt.VerifyJwtPk(token,pubKey)
    fmt.Println("verified: ", sigVerified)

    if sigVerified == false {
        fmt.Println(jwt.LastErrorText())
        pubKey.DisposePublicKey()
        jwt.DisposeJwt()
        return
    }

    // Let's see if the time constraints, if any, are valid.
    // The above JWT was created on the afternoon of 16-May-2016, with an expiration of 1 hour.
    // If the current system time is before the "nbf" time, or after the "exp" time,
    // then IsTimeValid will return false/0.
    // Also, we'll allow a leeway of 60 seconds to account for any clock skew.
    // Note: If the token has no "nbf" or "exp" claim fields, then IsTimeValid is always true.
    leeway := 60
    bTimeValid := jwt.IsTimeValid(token,leeway)
    fmt.Println("time constraints valid: ", bTimeValid)

    // Recover the original data (the payload).
    payload := jwt.GetPayload(token)
    fmt.Println(*payload)

    // Recover the original JOSE header in the same way:
    joseHeader := jwt.GetHeader(token)
    fmt.Println(*joseHeader)

    pubKey.DisposePublicKey()
    jwt.DisposeJwt()