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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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llSuccess = .F.

//  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).

loPrivKey = createobject("CkPrivateKey")

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

llSuccess = loPrivKey.LoadJwk(lcJwk)
if (llSuccess = .F.) then
    ? loPrivKey.LastErrorText
    release loPrivKey
    return
endif

? "Loaded a " + loPrivKey.KeyType + " private key."


release loPrivKey