Go
Go
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 Go Downloads
success := 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.
sbRsaJwk := chilkat.NewStringBuilder()
sbRsaJwk.Append("{\"kty\":\"RSA\",")
sbRsaJwk.Append("\"n\":\"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx")
sbRsaJwk.Append("HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs")
sbRsaJwk.Append("D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH")
sbRsaJwk.Append("SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV")
sbRsaJwk.Append("MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8")
sbRsaJwk.Append("NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ\",")
sbRsaJwk.Append("\"e\":\"AQAB\"")
sbRsaJwk.Append("}")
rsaKey := chilkat.NewPublicKey()
success = rsaKey.LoadFromString(*sbRsaJwk.GetAsString())
if success == false {
fmt.Println(rsaKey.LastErrorText())
sbRsaJwk.DisposeStringBuilder()
rsaKey.DisposePublicKey()
return
}
// ---------------------------------------------------
// Use the following ECC public key loaded from JWK format.
sbEccJwk := chilkat.NewStringBuilder()
sbEccJwk.Append("{\"kty\":\"EC\",")
sbEccJwk.Append("\"crv\":\"P-256\",")
sbEccJwk.Append("\"x\":\"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU\",")
sbEccJwk.Append("\"y\":\"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0\"")
sbEccJwk.Append("}")
eccKey := chilkat.NewPublicKey()
success = eccKey.LoadFromString(*sbEccJwk.GetAsString())
if success == false {
fmt.Println(eccKey.LastErrorText())
sbRsaJwk.DisposeStringBuilder()
rsaKey.DisposePublicKey()
sbEccJwk.DisposeStringBuilder()
eccKey.DisposePublicKey()
return
}
// ---------------------------------------------------
// The HMAC key (in base64url format)
hmacKey := "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 := chilkat.NewStringBuilder()
sbJws.Append("{ ")
sbJws.Append(" \"payload\": \"SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu\",")
sbJws.Append(" \"signatures\": [")
sbJws.Append(" { ")
sbJws.Append(" \"protected\": \"eyJhbGciOiJSUzI1NiIsImtpZCI6Im15UnNhS2V5In0\",")
sbJws.Append(" \"signature\": \"IPMQ02niTQDwLzsRZSCaEm9VEyAX_AVe3HWjniNt9kW-a8d6ZVbd2k6jGae8s1yIh0cgxDnXQ6-p6_sBI0cnMO0xpuJANhh2vFtNJl5lisad94-H3mB3lSfafRqxeYp5D8bh39BPv7y3PrUNVMQdKEJp_D5oJ0ROPTIYx3EG8eJQOx1HO0KqhcUo401XR6KSsIyFm5joBLNKTVzxZUTT1RRZZtwTdeZkbGevugIOX_9gHAtARpV6WaFA4Vvjnq8X9wPgqjWNCQRupadhTPz0JAsa-wy5vXQjsFlXAn43mDPpMfna5Ab3F5pS4yDwkbX6nRn7XBxH1SnnNJRFholQZw\"")
sbJws.Append(" },")
sbJws.Append(" { ")
sbJws.Append(" \"protected\": \"eyJhbGciOiJFUzI1NiIsImtpZCI6Im15RWNLZXkifQ\",")
sbJws.Append(" \"signature\": \"1OQtaT3pgZmkDxvlfghvxL_8kX16WIen6u1MadEq1pA4qytA0--_EwZDNk00GDPWFpoJtKznibMZzLOg_UhHIw\"")
sbJws.Append(" },")
sbJws.Append(" { ")
sbJws.Append(" \"protected\": \"eyJhbGciOiJIUzI1NiIsImtpZCI6Im15TWFjS2V5In0\",")
sbJws.Append(" \"signature\": \"YY8yVjmJJfy7YJOn3uUydG8WCY2PEuCvOLil5Ks5lnw\"")
sbJws.Append(" }")
sbJws.Append(" ]")
sbJws.Append("}")
jws := chilkat.NewJws()
success = jws.LoadJwsSb(sbJws)
if success == false {
fmt.Println(jws.LastErrorText())
sbRsaJwk.DisposeStringBuilder()
rsaKey.DisposePublicKey()
sbEccJwk.DisposeStringBuilder()
eccKey.DisposePublicKey()
sbJws.DisposeStringBuilder()
jws.DisposeJws()
return
}
// The payload is easily accessible:
fmt.Println("Payload: ", *jws.GetPayload("utf-8"))
sbKeyId := chilkat.NewStringBuilder()
bCaseSensitive := false
protHeader := chilkat.NewJsonObject()
numSignatures := jws.NumSignatures()
i := 0
for i < numSignatures {
success = jws.GetProtectedH(i,protHeader)
if success == false {
fmt.Println(jws.LastErrorText())
sbRsaJwk.DisposeStringBuilder()
rsaKey.DisposePublicKey()
sbEccJwk.DisposeStringBuilder()
eccKey.DisposePublicKey()
sbJws.DisposeStringBuilder()
jws.DisposeJws()
sbKeyId.DisposeStringBuilder()
protHeader.DisposeJsonObject()
return
}
fmt.Println("--------------------------")
fmt.Println(i, ": ")
// Get the protected header.
protHeader.SetEmitCompact(false)
fmt.Println(*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(*protHeader.StringOf("kid"))
// Set the key based on key ID.
if sbKeyId.ContentsEqual("myRsaKey",bCaseSensitive) == true {
jws.SetPublicKey(i,rsaKey)
}
if sbKeyId.ContentsEqual("myEcKey",bCaseSensitive) == true {
jws.SetPublicKey(i,eccKey)
}
if sbKeyId.ContentsEqual("myMacKey",bCaseSensitive) == true {
jws.SetMacKey(i,hmacKey,"base64url")
}
// Validate this signature.
v := jws.Validate(i)
if v < 0 {
// Perhaps Chilkat was not unlocked or the trial expired..
fmt.Println("Validate failed for some other reason.")
fmt.Println(jws.LastErrorText())
} else {
if v == 0 {
fmt.Println("Invalid signature. The key was incorrect, the JWS was invalid, or both.")
} else {
fmt.Println("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.
sbRsaJwk.DisposeStringBuilder()
rsaKey.DisposePublicKey()
sbEccJwk.DisposeStringBuilder()
eccKey.DisposePublicKey()
sbJws.DisposeStringBuilder()
jws.DisposeJws()
sbKeyId.DisposeStringBuilder()
protHeader.DisposeJsonObject()