Xbase++

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.

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LOCAL nSuccess
LOCAL oPrivKey
LOCAL cJwk

nSuccess := 0

//  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).

oPrivKey := CreateObject("Chilkat.PrivateKey")

//  A private JWK.  For a real key, "d" (and the other private parameters) would be present.
cJwk := '{"kty":"EC","crv":"P-256","x":"...","y":"...","d":"..."}'

nSuccess := oPrivKey:LoadJwk(cJwk)
IF (nSuccess == 0)
    ? oPrivKey:LastErrorText
    oPrivKey:destroy()
    RETURN
ENDIF

? "Loaded a " + oPrivKey:KeyType + " private key."

oPrivKey:destroy()