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(Excel) Verify JWT with EdDSA / Ed25519 SignatureNote: 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:
' 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""}" Dim pubKey As Chilkat.PublicKey Set pubKey = Chilkat.NewPublicKey success = pubKey.LoadFromString(jsonPubKey) If (success = False) Then Debug.Print pubKey.LastErrorText Exit Sub End If Dim jwt As Chilkat.Jwt Set jwt = Chilkat.NewJwt token = "eyJhbGciOiJFZERTQSJ9.RXhhbXBsZSBvZiBFZDI1NTE5IHNpZ25pbmc.hgyY0il_MGCjP0JzlnLWG1PPOt7-09PGcvMg3AIbQR6dWbhijcNR4ki4iylGjg5BhVsPt9g7sVvpAr_MuM0KAg" ' First verify the signature. sigVerified = jwt.VerifyJwtPk(token,pubKey) Debug.Print "verified: "; sigVerified If (sigVerified = False) Then Debug.Print jwt.LastErrorText Exit Sub End If ' 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) Debug.Print "time constraints valid: "; bTimeValid ' Recover the original data (the payload). payload = jwt.GetPayload(token) Debug.Print payload ' Recover the original JOSE header in the same way: joseHeader = jwt.GetHeader(token) Debug.Print joseHeader |
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