Swift
Swift
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 Swift Downloads
func chilkatTest() {
var success: Bool = 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.
let sbRsaJwk = CkoStringBuilder()!
sbRsaJwk.append(value: "{\"kty\":\"RSA\",")
sbRsaJwk.append(value: "\"n\":\"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx")
sbRsaJwk.append(value: "HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs")
sbRsaJwk.append(value: "D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH")
sbRsaJwk.append(value: "SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV")
sbRsaJwk.append(value: "MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8")
sbRsaJwk.append(value: "NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ\",")
sbRsaJwk.append(value: "\"e\":\"AQAB\"")
sbRsaJwk.append(value: "}")
let rsaKey = CkoPublicKey()!
success = rsaKey.load(fromString: sbRsaJwk.getAsString())
if success == false {
print("\(rsaKey.lastErrorText!)")
return
}
// ---------------------------------------------------
// Use the following ECC public key loaded from JWK format.
let sbEccJwk = CkoStringBuilder()!
sbEccJwk.append(value: "{\"kty\":\"EC\",")
sbEccJwk.append(value: "\"crv\":\"P-256\",")
sbEccJwk.append(value: "\"x\":\"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU\",")
sbEccJwk.append(value: "\"y\":\"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0\"")
sbEccJwk.append(value: "}")
let eccKey = CkoPublicKey()!
success = eccKey.load(fromString: sbEccJwk.getAsString())
if success == false {
print("\(eccKey.lastErrorText!)")
return
}
// ---------------------------------------------------
// The HMAC key (in base64url format)
var hmacKey: String? = "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"
// }
// ]
// }
let sbJws = CkoStringBuilder()!
sbJws.append(value: "{ ")
sbJws.append(value: " \"payload\": \"SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu\",")
sbJws.append(value: " \"signatures\": [")
sbJws.append(value: " { ")
sbJws.append(value: " \"protected\": \"eyJhbGciOiJSUzI1NiIsImtpZCI6Im15UnNhS2V5In0\",")
sbJws.append(value: " \"signature\": \"IPMQ02niTQDwLzsRZSCaEm9VEyAX_AVe3HWjniNt9kW-a8d6ZVbd2k6jGae8s1yIh0cgxDnXQ6-p6_sBI0cnMO0xpuJANhh2vFtNJl5lisad94-H3mB3lSfafRqxeYp5D8bh39BPv7y3PrUNVMQdKEJp_D5oJ0ROPTIYx3EG8eJQOx1HO0KqhcUo401XR6KSsIyFm5joBLNKTVzxZUTT1RRZZtwTdeZkbGevugIOX_9gHAtARpV6WaFA4Vvjnq8X9wPgqjWNCQRupadhTPz0JAsa-wy5vXQjsFlXAn43mDPpMfna5Ab3F5pS4yDwkbX6nRn7XBxH1SnnNJRFholQZw\"")
sbJws.append(value: " },")
sbJws.append(value: " { ")
sbJws.append(value: " \"protected\": \"eyJhbGciOiJFUzI1NiIsImtpZCI6Im15RWNLZXkifQ\",")
sbJws.append(value: " \"signature\": \"1OQtaT3pgZmkDxvlfghvxL_8kX16WIen6u1MadEq1pA4qytA0--_EwZDNk00GDPWFpoJtKznibMZzLOg_UhHIw\"")
sbJws.append(value: " },")
sbJws.append(value: " { ")
sbJws.append(value: " \"protected\": \"eyJhbGciOiJIUzI1NiIsImtpZCI6Im15TWFjS2V5In0\",")
sbJws.append(value: " \"signature\": \"YY8yVjmJJfy7YJOn3uUydG8WCY2PEuCvOLil5Ks5lnw\"")
sbJws.append(value: " }")
sbJws.append(value: " ]")
sbJws.append(value: "}")
let jws = CkoJws()!
success = jws.loadSb(sbJws: sbJws)
if success == false {
print("\(jws.lastErrorText!)")
return
}
// The payload is easily accessible:
print("Payload: \(jws.getPayload(charset: "utf-8")!)")
let sbKeyId = CkoStringBuilder()!
var bCaseSensitive: Bool = false
let protHeader = CkoJsonObject()!
var numSignatures: Int = jws.numSignatures.intValue
var i: Int = 0
while i < numSignatures {
success = jws.getProtectedH(index: i, json: protHeader)
if success == false {
print("\(jws.lastErrorText!)")
return
}
print("--------------------------")
print("\(i): ")
// Get the protected header.
protHeader.emitCompact = false
print("\(protHeader.emit()!)")
// 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).
sbKeyId.clear()
sbKeyId.append(value: protHeader.string(of: "kid"))
// Set the key based on key ID.
if sbKeyId.contentsEqual(str: "myRsaKey", caseSensitive: bCaseSensitive) == true {
jws.setPublicKey(index: i, pubKey: rsaKey)
}
if sbKeyId.contentsEqual(str: "myEcKey", caseSensitive: bCaseSensitive) == true {
jws.setPublicKey(index: i, pubKey: eccKey)
}
if sbKeyId.contentsEqual(str: "myMacKey", caseSensitive: bCaseSensitive) == true {
jws.setMacKey(index: i, key: hmacKey, encoding: "base64url")
}
// Validate this signature.
var v: Int = jws.validate(index: i).intValue
if v < 0 {
// Perhaps Chilkat was not unlocked or the trial expired..
print("Validate failed for some other reason.")
print("\(jws.lastErrorText!)")
}
else {
if v == 0 {
print("Invalid signature. The key was incorrect, the JWS was invalid, or both.")
}
else {
print("Signature validated.")
}
}
i = i + 1
}
// 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.
}