PureBasic
PureBasic
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 | | +--------------+-------------------------------+--------------------+
Chilkat PureBasic Downloads
IncludeFile "CkJws.pb"
IncludeFile "CkStringBuilder.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkPublicKey.pb"
Procedure ChilkatExample()
success.i = 0
; 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.
sbRsaJwk.i = CkStringBuilder::ckCreate()
If sbRsaJwk.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
CkStringBuilder::ckAppend(sbRsaJwk,"{" + Chr(34) + "kty" + Chr(34) + ":" + Chr(34) + "RSA" + Chr(34) + ",")
CkStringBuilder::ckAppend(sbRsaJwk,Chr(34) + "n" + Chr(34) + ":" + Chr(34) + "ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx")
CkStringBuilder::ckAppend(sbRsaJwk,"HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs")
CkStringBuilder::ckAppend(sbRsaJwk,"D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH")
CkStringBuilder::ckAppend(sbRsaJwk,"SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV")
CkStringBuilder::ckAppend(sbRsaJwk,"MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8")
CkStringBuilder::ckAppend(sbRsaJwk,"NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ" + Chr(34) + ",")
CkStringBuilder::ckAppend(sbRsaJwk,Chr(34) + "e" + Chr(34) + ":" + Chr(34) + "AQAB" + Chr(34))
CkStringBuilder::ckAppend(sbRsaJwk,"}")
rsaKey.i = CkPublicKey::ckCreate()
If rsaKey.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
success = CkPublicKey::ckLoadFromString(rsaKey,CkStringBuilder::ckGetAsString(sbRsaJwk))
If success = 0
Debug CkPublicKey::ckLastErrorText(rsaKey)
CkStringBuilder::ckDispose(sbRsaJwk)
CkPublicKey::ckDispose(rsaKey)
ProcedureReturn
EndIf
; ---------------------------------------------------
; Use the following ECC public key loaded from JWK format.
sbEccJwk.i = CkStringBuilder::ckCreate()
If sbEccJwk.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
CkStringBuilder::ckAppend(sbEccJwk,"{" + Chr(34) + "kty" + Chr(34) + ":" + Chr(34) + "EC" + Chr(34) + ",")
CkStringBuilder::ckAppend(sbEccJwk,Chr(34) + "crv" + Chr(34) + ":" + Chr(34) + "P-256" + Chr(34) + ",")
CkStringBuilder::ckAppend(sbEccJwk,Chr(34) + "x" + Chr(34) + ":" + Chr(34) + "f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU" + Chr(34) + ",")
CkStringBuilder::ckAppend(sbEccJwk,Chr(34) + "y" + Chr(34) + ":" + Chr(34) + "x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0" + Chr(34))
CkStringBuilder::ckAppend(sbEccJwk,"}")
eccKey.i = CkPublicKey::ckCreate()
If eccKey.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
success = CkPublicKey::ckLoadFromString(eccKey,CkStringBuilder::ckGetAsString(sbEccJwk))
If success = 0
Debug CkPublicKey::ckLastErrorText(eccKey)
CkStringBuilder::ckDispose(sbRsaJwk)
CkPublicKey::ckDispose(rsaKey)
CkStringBuilder::ckDispose(sbEccJwk)
CkPublicKey::ckDispose(eccKey)
ProcedureReturn
EndIf
; ---------------------------------------------------
; The HMAC key (in base64url format)
hmacKey.s = "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"
; }
; ]
; }
sbJws.i = CkStringBuilder::ckCreate()
If sbJws.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
CkStringBuilder::ckAppend(sbJws,"{ ")
CkStringBuilder::ckAppend(sbJws," " + Chr(34) + "payload" + Chr(34) + ": " + Chr(34) + "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu" + Chr(34) + ",")
CkStringBuilder::ckAppend(sbJws," " + Chr(34) + "signatures" + Chr(34) + ": [")
CkStringBuilder::ckAppend(sbJws," { ")
CkStringBuilder::ckAppend(sbJws," " + Chr(34) + "protected" + Chr(34) + ": " + Chr(34) + "eyJhbGciOiJSUzI1NiIsImtpZCI6Im15UnNhS2V5In0" + Chr(34) + ",")
CkStringBuilder::ckAppend(sbJws," " + Chr(34) + "signature" + Chr(34) + ": " + Chr(34) + "IPMQ02niTQDwLzsRZSCaEm9VEyAX_AVe3HWjniNt9kW-a8d6ZVbd2k6jGae8s1yIh0cgxDnXQ6-p6_sBI0cnMO0xpuJANhh2vFtNJl5lisad94-H3mB3lSfafRqxeYp5D8bh39BPv7y3PrUNVMQdKEJp_D5oJ0ROPTIYx3EG8eJQOx1HO0KqhcUo401XR6KSsIyFm5joBLNKTVzxZUTT1RRZZtwTdeZkbGevugIOX_9gHAtARpV6WaFA4Vvjnq8X9wPgqjWNCQRupadhTPz0JAsa-wy5vXQjsFlXAn43mDPpMfna5Ab3F5pS4yDwkbX6nRn7XBxH1SnnNJRFholQZw" + Chr(34))
CkStringBuilder::ckAppend(sbJws," },")
CkStringBuilder::ckAppend(sbJws," { ")
CkStringBuilder::ckAppend(sbJws," " + Chr(34) + "protected" + Chr(34) + ": " + Chr(34) + "eyJhbGciOiJFUzI1NiIsImtpZCI6Im15RWNLZXkifQ" + Chr(34) + ",")
CkStringBuilder::ckAppend(sbJws," " + Chr(34) + "signature" + Chr(34) + ": " + Chr(34) + "1OQtaT3pgZmkDxvlfghvxL_8kX16WIen6u1MadEq1pA4qytA0--_EwZDNk00GDPWFpoJtKznibMZzLOg_UhHIw" + Chr(34))
CkStringBuilder::ckAppend(sbJws," },")
CkStringBuilder::ckAppend(sbJws," { ")
CkStringBuilder::ckAppend(sbJws," " + Chr(34) + "protected" + Chr(34) + ": " + Chr(34) + "eyJhbGciOiJIUzI1NiIsImtpZCI6Im15TWFjS2V5In0" + Chr(34) + ",")
CkStringBuilder::ckAppend(sbJws," " + Chr(34) + "signature" + Chr(34) + ": " + Chr(34) + "YY8yVjmJJfy7YJOn3uUydG8WCY2PEuCvOLil5Ks5lnw" + Chr(34))
CkStringBuilder::ckAppend(sbJws," }")
CkStringBuilder::ckAppend(sbJws," ]")
CkStringBuilder::ckAppend(sbJws,"}")
jws.i = CkJws::ckCreate()
If jws.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
success = CkJws::ckLoadJwsSb(jws,sbJws)
If success = 0
Debug CkJws::ckLastErrorText(jws)
CkStringBuilder::ckDispose(sbRsaJwk)
CkPublicKey::ckDispose(rsaKey)
CkStringBuilder::ckDispose(sbEccJwk)
CkPublicKey::ckDispose(eccKey)
CkStringBuilder::ckDispose(sbJws)
CkJws::ckDispose(jws)
ProcedureReturn
EndIf
; The payload is easily accessible:
Debug "Payload: " + CkJws::ckGetPayload(jws,"utf-8")
sbKeyId.i = CkStringBuilder::ckCreate()
If sbKeyId.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
bCaseSensitive.i = 0
protHeader.i = CkJsonObject::ckCreate()
If protHeader.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
numSignatures.i = CkJws::ckNumSignatures(jws)
i.i = 0
While i < numSignatures
success = CkJws::ckGetProtectedH(jws,i,protHeader)
If success = 0
Debug CkJws::ckLastErrorText(jws)
CkStringBuilder::ckDispose(sbRsaJwk)
CkPublicKey::ckDispose(rsaKey)
CkStringBuilder::ckDispose(sbEccJwk)
CkPublicKey::ckDispose(eccKey)
CkStringBuilder::ckDispose(sbJws)
CkJws::ckDispose(jws)
CkStringBuilder::ckDispose(sbKeyId)
CkJsonObject::ckDispose(protHeader)
ProcedureReturn
EndIf
Debug "--------------------------"
Debug Str(i) + ": "
; Get the protected header.
CkJsonObject::setCkEmitCompact(protHeader, 0)
Debug CkJsonObject::ckEmit(protHeader)
; 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).
CkStringBuilder::ckClear(sbKeyId)
CkStringBuilder::ckAppend(sbKeyId,CkJsonObject::ckStringOf(protHeader,"kid"))
; Set the key based on key ID.
If CkStringBuilder::ckContentsEqual(sbKeyId,"myRsaKey",bCaseSensitive) = 1
CkJws::ckSetPublicKey(jws,i,rsaKey)
EndIf
If CkStringBuilder::ckContentsEqual(sbKeyId,"myEcKey",bCaseSensitive) = 1
CkJws::ckSetPublicKey(jws,i,eccKey)
EndIf
If CkStringBuilder::ckContentsEqual(sbKeyId,"myMacKey",bCaseSensitive) = 1
CkJws::ckSetMacKey(jws,i,hmacKey,"base64url")
EndIf
; Validate this signature.
v.i = CkJws::ckValidate(jws,i)
If v < 0
; Perhaps Chilkat was not unlocked or the trial expired..
Debug "Validate failed for some other reason."
Debug CkJws::ckLastErrorText(jws)
Else
If v = 0
Debug "Invalid signature. The key was incorrect, the JWS was invalid, or both."
Else
Debug "Signature validated."
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.
CkStringBuilder::ckDispose(sbRsaJwk)
CkPublicKey::ckDispose(rsaKey)
CkStringBuilder::ckDispose(sbEccJwk)
CkPublicKey::ckDispose(eccKey)
CkStringBuilder::ckDispose(sbJws)
CkJws::ckDispose(jws)
CkStringBuilder::ckDispose(sbKeyId)
CkJsonObject::ckDispose(protHeader)
ProcedureReturn
EndProcedure