PowerBuilder 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. PowerBuilder

integer li_rc
integer li_Success
oleobject loo_SbPubKey
oleobject loo_PubKey
oleobject loo_Jws
integer li_SignatureIndex
oleobject loo_SbJws
integer v
oleobject loo_JoseHeader

li_Success = 0

//  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"
//       }

loo_SbPubKey = create oleobject
li_rc = loo_SbPubKey.ConnectToNewObject("Chilkat.StringBuilder")
if li_rc < 0 then
    destroy loo_SbPubKey
    MessageBox("Error","Connecting to COM object failed")
    return
end if
loo_SbPubKey.Append("{~"kty~":~"RSA~",")
loo_SbPubKey.Append("~"n~":~"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx")
loo_SbPubKey.Append("HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs")
loo_SbPubKey.Append("D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH")
loo_SbPubKey.Append("SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV")
loo_SbPubKey.Append("MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8")
loo_SbPubKey.Append("NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ~",")
loo_SbPubKey.Append("~"e~":~"AQAB~"")
loo_SbPubKey.Append("}")

loo_PubKey = create oleobject
li_rc = loo_PubKey.ConnectToNewObject("Chilkat.PublicKey")

li_Success = loo_PubKey.LoadFromString(loo_SbPubKey.GetAsString())
if li_Success = 0 then
    Write-Debug loo_PubKey.LastErrorText
    destroy loo_SbPubKey
    destroy loo_PubKey
    return
end if

loo_Jws = create oleobject
li_rc = loo_Jws.ConnectToNewObject("Chilkat.Jws")

//  Set the RSA public key:
li_SignatureIndex = 0
loo_Jws.SetPublicKey(li_SignatureIndex,loo_PubKey)

//  Load the JWS.
loo_SbJws = create oleobject
li_rc = loo_SbJws.ConnectToNewObject("Chilkat.StringBuilder")

loo_SbJws.Append("eyJhbGciOiJSUzI1NiJ9")
loo_SbJws.Append(".")
loo_SbJws.Append("eyJpc3MiOiJqb2UiLA0KICJleHAiOjEzMDA4MTkzODAsDQogImh0dHA6Ly9leGFt")
loo_SbJws.Append("cGxlLmNvbS9pc19yb290Ijp0cnVlfQ")
loo_SbJws.Append(".")
loo_SbJws.Append("cC4hiUPoj9Eetdgtv3hF80EGrhuB__dzERat0XF9g2VtQgr9PJbu3XOiZj5RZmh7")
loo_SbJws.Append("AAuHIm4Bh-0Qc_lF5YKt_O8W2Fp5jujGbds9uJdbF9CUAr7t1dnZcAcQjbKBYNX4")
loo_SbJws.Append("BAynRFdiuB--f_nZLgrnbyTyWzO75vRK5h6xBArLIARNPvkSjtQBMHlb1L07Qe7K")
loo_SbJws.Append("0GarZRmB_eSN9383LcOLn6_dO--xi12jzDwusC-eOkHWEsqtFZESc6BfI7noOPqv")
loo_SbJws.Append("hJ1phCnvWh6IeYI2w9QOYEUipUTI8np6LbgGY9Fs98rqVt5AXLIhWkWywlVmtVrB")
loo_SbJws.Append("p0igcN_IoypGlUPQGe77Rw")

li_Success = loo_Jws.LoadJwsSb(loo_SbJws)
if li_Success = 0 then
    Write-Debug loo_Jws.LastErrorText
    destroy loo_SbPubKey
    destroy loo_PubKey
    destroy loo_Jws
    destroy loo_SbJws
    return
end if

//  Validate the 1st (and only) signature at index 0..
v = loo_Jws.Validate(li_SignatureIndex)
if v < 0 then
    //  Perhaps Chilkat was not unlocked or the trial expired..
    Write-Debug "Method call failed for some other reason."
    Write-Debug loo_Jws.LastErrorText
    destroy loo_SbPubKey
    destroy loo_PubKey
    destroy loo_Jws
    destroy loo_SbJws
    return
end if

if v = 0 then
    Write-Debug "Invalid signature.  The RSA key was incorrect, the JWS was invalid, or both."
    destroy loo_SbPubKey
    destroy loo_PubKey
    destroy loo_Jws
    destroy loo_SbJws
    return
end if

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

//  Recover the original content:
Write-Debug "Recovered content:"
Write-Debug loo_Jws.GetPayload("utf-8")
Write-Debug "--"

//  Examine the protected header:

loo_JoseHeader = create oleobject
li_rc = loo_JoseHeader.ConnectToNewObject("Chilkat.JsonObject")

li_Success = loo_Jws.GetProtectedH(li_SignatureIndex,loo_JoseHeader)
if li_Success = 0 then
    Write-Debug loo_Jws.LastErrorText
    destroy loo_SbPubKey
    destroy loo_PubKey
    destroy loo_Jws
    destroy loo_SbJws
    destroy loo_JoseHeader
    return
end if

loo_JoseHeader.EmitCompact = 0

Write-Debug "Protected (JOSE) header:"
Write-Debug loo_JoseHeader.Emit()

//  Output:

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


destroy loo_SbPubKey
destroy loo_PubKey
destroy loo_Jws
destroy loo_SbJws
destroy loo_JoseHeader