Validate a JWS Signature

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.Validate, which validates exactly one signature, identified by a zero-based index, using the key configured at that same index.

llSuccess = .F.

loJws = createobject("CkJws")

//  Load the JWS compact serialization.
lcJwsCompact = "eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>"
llSuccess = loJws.LoadJws(lcJwsCompact)
if (llSuccess = .F.) then
    ? loJws.LastErrorText
    release loJws
    return
endif

//  Provide the key for signature 0 (here an HMAC key).
lcBase64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
llSuccess = loJws.SetMacKey(0,lcBase64Key,"base64")
if (llSuccess = .F.) then
    ? loJws.LastErrorText
    release loJws
    return
endif

//  Validate the signature identified by the zero-based index, using the key configured at that index.
//  Validate returns 1 when the signature or MAC is cryptographically valid, 0 when it is not, or a
//  negative value on error.
v = loJws.Validate(0)
if (v < 0) then
    ? loJws.LastErrorText
    release loJws
    return
endif

if (v <> 1) then
    ? "The signature is not valid."
    release loJws
    return
endif

? "The signature is valid."


release loJws