(Ruby) Verify JWT with EdDSA / Ed25519 Signature

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.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# 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::CkPublicKey.new()
success = pubKey.LoadFromString(jsonPubKey)
if (success == false)
    print pubKey.lastErrorText() + "\n";
    exit
end

jwt = Chilkat::CkJwt.new()
token = "eyJhbGciOiJFZERTQSJ9.RXhhbXBsZSBvZiBFZDI1NTE5IHNpZ25pbmc.hgyY0il_MGCjP0JzlnLWG1PPOt7-09PGcvMg3AIbQR6dWbhijcNR4ki4iylGjg5BhVsPt9g7sVvpAr_MuM0KAg"

# First verify the signature.
sigVerified = jwt.VerifyJwtPk(token,pubKey)
print "verified: " + sigVerified.to_s() + "\n";

if (sigVerified == false)
    print jwt.lastErrorText() + "\n";
    exit
end

# 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)
print "time constraints valid: " + bTimeValid.to_s() + "\n";

# Recover the original data (the payload).
payload = jwt.getPayload(token)
print payload + "\n";

# Recover the original JOSE header in the same way:
joseHeader = jwt.getHeader(token)
print joseHeader + "\n";