B4X

Load a Private Key from a JWK

Demonstrates the Chilkat PrivateKey.LoadJwk method, which loads a private key from JWK (JSON Web Key) JSON. The only argument is the JWK JSON string. Supported key types are RSA, EC, and Ed25519 (kty=OKP).

Background: JWK is the JSON key format used throughout modern web security — JWT signing, OAuth, OpenID Connect — so this loader is what you use to consume a key from a JWK Set or an identity provider. A private JWK includes the private parameters (d and, for RSA, the CRT values); a public-only JWK omits them. As JSON in the clear, a private JWK must be handled as sensitive material.

Chilkat B4X Downloads

Download Chilkat for B4X

B4X

Dim success As Boolean = False

'  Demonstrates the PrivateKey.LoadJwk method, which loads a private key from JWK (JSON Web Key)
'  JSON.  The only argument is the JWK JSON string.  Supported key types are RSA, EC, and
'  Ed25519 (kty=OKP).

Dim privKey As ChilkatPrivateKey
privKey.Initialize("privKey")

'  A private JWK.  For a real key, "d" (and the other private parameters) would be present.
Dim jwk As String = "{" & Chr(34) & "kty" & Chr(34) & ":" & Chr(34) & "EC" & Chr(34) & "," & Chr(34) & "crv" & Chr(34) & ":" & Chr(34) & "P-256" & Chr(34) & "," & Chr(34) & "x" & Chr(34) & ":" & Chr(34) & "..." & Chr(34) & "," & Chr(34) & "y" & Chr(34) & ":" & Chr(34) & "..." & Chr(34) & "," & Chr(34) & "d" & Chr(34) & ":" & Chr(34) & "..." & Chr(34) & "}"

success = privKey.LoadJwk(jwk)
If success = False Then
    Log(privKey.LastErrorText)
    Return
End If


Log("Loaded a " & privKey.KeyType & " private key.")