Lianja Requires Chilkat v11.0.0+

Validate JWS Using RSASSA-PKCS1-v1_5 SHA-256

See more JSON Web Signatures (JWS) Examples

Validates a JSON Web Signature (JWS) that uses RSASSA-PKCS1-v1_5 SHA-256. Lianja

llSuccess = .F.

//  This requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  This example takes a JSON signature in compact serialization format,
//  and uses an RSA public key to validate and recover the protected header and payload.

//  We only need a public key for signature validation.  This is the RSA public key
//  that is used:

//       {"kty":"RSA", 
//        "n":"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx
//             HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs
//             D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH
//             SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV
//             MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8
//             NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ", 
//        "e":"AQAB"
//       }

loSbPubKey = createobject("CkStringBuilder")
loSbPubKey.Append('{"kty":"RSA",')
loSbPubKey.Append('"n":"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx')
loSbPubKey.Append("HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs")
loSbPubKey.Append("D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH")
loSbPubKey.Append("SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV")
loSbPubKey.Append("MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8")
loSbPubKey.Append('NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ",')
loSbPubKey.Append('"e":"AQAB"')
loSbPubKey.Append("}")

loPubKey = createobject("CkPublicKey")
llSuccess = loPubKey.LoadFromString(loSbPubKey.GetAsString())
if (llSuccess = .F.) then
    ? loPubKey.LastErrorText
    release loSbPubKey
    release loPubKey
    return
endif

loJws = createobject("CkJws")

//  Set the RSA public key:
lnSignatureIndex = 0
loJws.SetPublicKey(lnSignatureIndex,loPubKey)

//  Load the JWS.
loSbJws = createobject("CkStringBuilder")
loSbJws.Append("eyJhbGciOiJSUzI1NiJ9")
loSbJws.Append(".")
loSbJws.Append("eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFt")
loSbJws.Append("cGxlLmNvbS9pc19yb290Ijp0cnVlfQ")
loSbJws.Append(".")
loSbJws.Append("cC4hiUPoj9Eetdgtv3hF80EGrhuB__dzERat0XF9g2VtQgr9PJbu3XOiZj5RZmh7")
loSbJws.Append("AAuHIm4Bh-0Qc_lF5YKt_O8W2Fp5jujGbds9uJdbF9CUAr7t1dnZcAcQjbKBYNX4")
loSbJws.Append("BAynRFdiuB--f_nZLgrnbyTyWzO75vRK5h6xBArLIARNPvkSjtQBMHlb1L07Qe7K")
loSbJws.Append("0GarZRmB_eSN9383LcOLn6_dO--xi12jzDwusC-eOkHWEsqtFZESc6BfI7noOPqv")
loSbJws.Append("hJ1phCnvWh6IeYI2w9QOYEUipUTI8np6LbgGY9Fs98rqVt5AXLIhWkWywlVmtVrB")
loSbJws.Append("p0igcN_IoypGlUPQGe77Rw")

llSuccess = loJws.LoadJwsSb(loSbJws)
if (llSuccess = .F.) then
    ? loJws.LastErrorText
    release loSbPubKey
    release loPubKey
    release loJws
    release loSbJws
    return
endif

//  Validate the 1st (and only) signature at index 0..
v = loJws.Validate(lnSignatureIndex)
if (v < 0) then
    //  Perhaps Chilkat was not unlocked or the trial expired..
    ? "Method call failed for some other reason."
    ? loJws.LastErrorText
    release loSbPubKey
    release loPubKey
    release loJws
    release loSbJws
    return
endif

if (v = 0) then
    ? "Invalid signature.  The RSA key was incorrect, the JWS was invalid, or both."
    release loSbPubKey
    release loPubKey
    release loJws
    release loSbJws
    return
endif

//  If we get here, the signature was validated..
? "Signature validated."
? "--"

//  Recover the original content:
? "Recovered content:"
? loJws.GetPayload("utf-8")
? "--"

//  Examine the protected header:

loJoseHeader = createobject("CkJsonObject")
llSuccess = loJws.GetProtectedH(lnSignatureIndex,loJoseHeader)
if (llSuccess = .F.) then
    ? loJws.LastErrorText
    release loSbPubKey
    release loPubKey
    release loJws
    release loSbJws
    release loJoseHeader
    return
endif

loJoseHeader.EmitCompact = .F.

? "Protected (JOSE) header:"
? loJoseHeader.Emit()

//  Output:

//  	Signature validated.
//  	--
//  	Recovered content:
//  	{"iss":"joe", 
//  	 "exp":1300819380,
//  	 "http://example.com/is_root":true}
//  	--
//  	Protected (JOSE) header:
//  	{ 
//  	  "alg": "RS256"
//  	}


release loSbPubKey
release loPubKey
release loJws
release loSbJws
release loJoseHeader