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Validate JWS with Multiple Signatures using the General JSON Serialization Format
See more JSON Web Signatures (JWS) Examples
Validates and recovers data and headers from a JSON Web Signature (JWS) containing 3 signatures.Note: Chilkat supports all of the following JWS algorithms:
+--------------+-------------------------------+--------------------+ | "alg" Param | Digital Signature or MAC | Implementation | | Value | Algorithm | Requirements | +--------------+-------------------------------+--------------------+ | HS256 | HMAC using SHA-256 | Required | | HS384 | HMAC using SHA-384 | Optional | | HS512 | HMAC using SHA-512 | Optional | | RS256 | RSASSA-PKCS1-v1_5 using | Recommended | | | SHA-256 | | | RS384 | RSASSA-PKCS1-v1_5 using | Optional | | | SHA-384 | | | RS512 | RSASSA-PKCS1-v1_5 using | Optional | | | SHA-512 | | | ES256 | ECDSA using P-256 and SHA-256 | Recommended+ | | ES384 | ECDSA using P-384 and SHA-384 | Optional | | ES512 | ECDSA using P-521 and SHA-512 | Optional | | PS256 | RSASSA-PSS using SHA-256 and | Optional | | | MGF1 with SHA-256 | | | PS384 | RSASSA-PSS using SHA-384 and | Optional | | | MGF1 with SHA-384 | | | PS512 | RSASSA-PSS using SHA-512 and | Optional | | | MGF1 with SHA-512 | | +--------------+-------------------------------+--------------------+
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Local $bSuccess = False
; This requires the Chilkat API to have been previously unlocked.
; See Global Unlock Sample for sample code.
; First, prepare the public keys that will be needed for each signature.
; ---------------------------------------------------
; Use the following RSA key loaded from JWK format.
$oSbRsaJwk = ObjCreate("Chilkat.StringBuilder")
$oSbRsaJwk.Append("{""kty"":""RSA"",")
$oSbRsaJwk.Append("""n"":""ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx")
$oSbRsaJwk.Append("HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs")
$oSbRsaJwk.Append("D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH")
$oSbRsaJwk.Append("SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV")
$oSbRsaJwk.Append("MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8")
$oSbRsaJwk.Append("NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ"",")
$oSbRsaJwk.Append("""e"":""AQAB""")
$oSbRsaJwk.Append("}")
$oRsaKey = ObjCreate("Chilkat.PublicKey")
$bSuccess = $oRsaKey.LoadFromString($oSbRsaJwk.GetAsString())
If ($bSuccess = False) Then
ConsoleWrite($oRsaKey.LastErrorText & @CRLF)
Exit
EndIf
; ---------------------------------------------------
; Use the following ECC public key loaded from JWK format.
$oSbEccJwk = ObjCreate("Chilkat.StringBuilder")
$oSbEccJwk.Append("{""kty"":""EC"",")
$oSbEccJwk.Append("""crv"":""P-256"",")
$oSbEccJwk.Append("""x"":""f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU"",")
$oSbEccJwk.Append("""y"":""x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0""")
$oSbEccJwk.Append("}")
$oEccKey = ObjCreate("Chilkat.PublicKey")
$bSuccess = $oEccKey.LoadFromString($oSbEccJwk.GetAsString())
If ($bSuccess = False) Then
ConsoleWrite($oEccKey.LastErrorText & @CRLF)
Exit
EndIf
; ---------------------------------------------------
; The HMAC key (in base64url format)
Local $sHmacKey = "AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow"
; The code below will verify each of the signatures in this JWS:
; {
; "payload": "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu",
; "signatures": [
; {
; "protected": "eyJhbGciOiJSUzI1NiIsImtpZCI6Im15UnNhS2V5In0",
; "signature": "IPMQ02niTQDwLzsRZSCaEm9VEyAX_AVe3HWjniNt9kW-a8d6ZVbd2k6jGae8s1yIh0cgxDnXQ6-p6_sBI0cnMO0xpuJANhh2vFtNJl5lisad94-H3mB3lSfafRqxeYp5D8bh39BPv7y3PrUNVMQdKEJp_D5oJ0ROPTIYx3EG8eJQOx1HO0KqhcUo401XR6KSsIyFm5joBLNKTVzxZUTT1RRZZtwTdeZkbGevugIOX_9gHAtARpV6WaFA4Vvjnq8X9wPgqjWNCQRupadhTPz0JAsa-wy5vXQjsFlXAn43mDPpMfna5Ab3F5pS4yDwkbX6nRn7XBxH1SnnNJRFholQZw"
; },
; {
; "protected": "eyJhbGciOiJFUzI1NiIsImtpZCI6Im15RWNLZXkifQ",
; "signature": "1OQtaT3pgZmkDxvlfghvxL_8kX16WIen6u1MadEq1pA4qytA0--_EwZDNk00GDPWFpoJtKznibMZzLOg_UhHIw"
; },
; {
; "protected": "eyJhbGciOiJIUzI1NiIsImtpZCI6Im15TWFjS2V5In0",
; "signature": "YY8yVjmJJfy7YJOn3uUydG8WCY2PEuCvOLil5Ks5lnw"
; }
; ]
; }
$oSbJws = ObjCreate("Chilkat.StringBuilder")
$oSbJws.Append("{ ")
$oSbJws.Append(" ""payload"": ""SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu"",")
$oSbJws.Append(" ""signatures"": [")
$oSbJws.Append(" { ")
$oSbJws.Append(" ""protected"": ""eyJhbGciOiJSUzI1NiIsImtpZCI6Im15UnNhS2V5In0"",")
$oSbJws.Append(" ""signature"": ""IPMQ02niTQDwLzsRZSCaEm9VEyAX_AVe3HWjniNt9kW-a8d6ZVbd2k6jGae8s1yIh0cgxDnXQ6-p6_sBI0cnMO0xpuJANhh2vFtNJl5lisad94-H3mB3lSfafRqxeYp5D8bh39BPv7y3PrUNVMQdKEJp_D5oJ0ROPTIYx3EG8eJQOx1HO0KqhcUo401XR6KSsIyFm5joBLNKTVzxZUTT1RRZZtwTdeZkbGevugIOX_9gHAtARpV6WaFA4Vvjnq8X9wPgqjWNCQRupadhTPz0JAsa-wy5vXQjsFlXAn43mDPpMfna5Ab3F5pS4yDwkbX6nRn7XBxH1SnnNJRFholQZw""")
$oSbJws.Append(" },")
$oSbJws.Append(" { ")
$oSbJws.Append(" ""protected"": ""eyJhbGciOiJFUzI1NiIsImtpZCI6Im15RWNLZXkifQ"",")
$oSbJws.Append(" ""signature"": ""1OQtaT3pgZmkDxvlfghvxL_8kX16WIen6u1MadEq1pA4qytA0--_EwZDNk00GDPWFpoJtKznibMZzLOg_UhHIw""")
$oSbJws.Append(" },")
$oSbJws.Append(" { ")
$oSbJws.Append(" ""protected"": ""eyJhbGciOiJIUzI1NiIsImtpZCI6Im15TWFjS2V5In0"",")
$oSbJws.Append(" ""signature"": ""YY8yVjmJJfy7YJOn3uUydG8WCY2PEuCvOLil5Ks5lnw""")
$oSbJws.Append(" }")
$oSbJws.Append(" ]")
$oSbJws.Append("}")
$oJws = ObjCreate("Chilkat.Jws")
$bSuccess = $oJws.LoadJwsSb($oSbJws)
If ($bSuccess = False) Then
ConsoleWrite($oJws.LastErrorText & @CRLF)
Exit
EndIf
; The payload is easily accessible:
ConsoleWrite("Payload: " & $oJws.GetPayload("utf-8") & @CRLF)
$oSbKeyId = ObjCreate("Chilkat.StringBuilder")
Local $bCaseSensitive = False
$oProtHeader = ObjCreate("Chilkat.JsonObject")
Local $iNumSignatures = $oJws.NumSignatures
Local $i = 0
While $i < $iNumSignatures
$bSuccess = $oJws.GetProtectedH($i,$oProtHeader)
If ($bSuccess = False) Then
ConsoleWrite($oJws.LastErrorText & @CRLF)
Exit
EndIf
ConsoleWrite("--------------------------" & @CRLF)
ConsoleWrite($i & ": " & @CRLF)
; Get the protected header.
$oProtHeader.EmitCompact = False
ConsoleWrite($oProtHeader.Emit() & @CRLF)
; Get the key ID ("kid") member.
; Note: In this example, the "kid" values are contained in the protected headers.
; They could've just as easily been located in unprotected headers. In that case,
; we would've called GetUnprotectedH instead of GetProtectedH(i).
$oSbKeyId.Clear
$oSbKeyId.Append($oProtHeader.StringOf("kid"))
; Set the key based on key ID.
If ($oSbKeyId.ContentsEqual("myRsaKey",$bCaseSensitive) = True) Then
$oJws.SetPublicKey($i,$oRsaKey)
EndIf
If ($oSbKeyId.ContentsEqual("myEcKey",$bCaseSensitive) = True) Then
$oJws.SetPublicKey($i,$oEccKey)
EndIf
If ($oSbKeyId.ContentsEqual("myMacKey",$bCaseSensitive) = True) Then
$oJws.SetMacKey($i,$sHmacKey,"base64url")
EndIf
; Validate this signature.
Local $iV = $oJws.Validate($i)
If ($iV < 0) Then
; Perhaps Chilkat was not unlocked or the trial expired..
ConsoleWrite("Validate failed for some other reason." & @CRLF)
ConsoleWrite($oJws.LastErrorText & @CRLF)
Else
If ($iV = 0) Then
ConsoleWrite("Invalid signature. The key was incorrect, the JWS was invalid, or both." & @CRLF)
Else
ConsoleWrite("Signature validated." & @CRLF)
EndIf
EndIf
$i = $i + 1
Wend
; The output of this program is:
; Payload: In our village, folks say God crumbles up the old moon into stars.
; --------------------------
; 0:
; {
; "alg": "RS256",
; "kid": "myRsaKey"
; }
;
; Signature validated.
; --------------------------
; 1:
; {
; "alg": "ES256",
; "kid": "myEcKey"
; }
;
; Signature validated.
; --------------------------
; 2:
; {
; "alg": "HS256",
; "kid": "myMacKey"
; }
;
; Signature validated.