Unicode C
Unicode C
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 Unicode C Downloads
#include <C_CkStringBuilderW.h>
#include <C_CkPublicKeyW.h>
#include <C_CkJwsW.h>
#include <C_CkJsonObjectW.h>
void ChilkatSample(void)
{
BOOL success;
HCkStringBuilderW sbRsaJwk;
HCkPublicKeyW rsaKey;
HCkStringBuilderW sbEccJwk;
HCkPublicKeyW eccKey;
const wchar_t *hmacKey;
HCkStringBuilderW sbJws;
HCkJwsW jws;
HCkStringBuilderW sbKeyId;
BOOL bCaseSensitive;
HCkJsonObjectW protHeader;
int numSignatures;
int i;
int v;
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 = CkStringBuilderW_Create();
CkStringBuilderW_Append(sbRsaJwk,L"{\"kty\":\"RSA\",");
CkStringBuilderW_Append(sbRsaJwk,L"\"n\":\"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx");
CkStringBuilderW_Append(sbRsaJwk,L"HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs");
CkStringBuilderW_Append(sbRsaJwk,L"D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH");
CkStringBuilderW_Append(sbRsaJwk,L"SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV");
CkStringBuilderW_Append(sbRsaJwk,L"MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8");
CkStringBuilderW_Append(sbRsaJwk,L"NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ\",");
CkStringBuilderW_Append(sbRsaJwk,L"\"e\":\"AQAB\"");
CkStringBuilderW_Append(sbRsaJwk,L"}");
rsaKey = CkPublicKeyW_Create();
success = CkPublicKeyW_LoadFromString(rsaKey,CkStringBuilderW_getAsString(sbRsaJwk));
if (success == FALSE) {
wprintf(L"%s\n",CkPublicKeyW_lastErrorText(rsaKey));
CkStringBuilderW_Dispose(sbRsaJwk);
CkPublicKeyW_Dispose(rsaKey);
return;
}
// ---------------------------------------------------
// Use the following ECC public key loaded from JWK format.
sbEccJwk = CkStringBuilderW_Create();
CkStringBuilderW_Append(sbEccJwk,L"{\"kty\":\"EC\",");
CkStringBuilderW_Append(sbEccJwk,L"\"crv\":\"P-256\",");
CkStringBuilderW_Append(sbEccJwk,L"\"x\":\"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU\",");
CkStringBuilderW_Append(sbEccJwk,L"\"y\":\"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0\"");
CkStringBuilderW_Append(sbEccJwk,L"}");
eccKey = CkPublicKeyW_Create();
success = CkPublicKeyW_LoadFromString(eccKey,CkStringBuilderW_getAsString(sbEccJwk));
if (success == FALSE) {
wprintf(L"%s\n",CkPublicKeyW_lastErrorText(eccKey));
CkStringBuilderW_Dispose(sbRsaJwk);
CkPublicKeyW_Dispose(rsaKey);
CkStringBuilderW_Dispose(sbEccJwk);
CkPublicKeyW_Dispose(eccKey);
return;
}
// ---------------------------------------------------
// The HMAC key (in base64url format)
hmacKey = L"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 = CkStringBuilderW_Create();
CkStringBuilderW_Append(sbJws,L"{ ");
CkStringBuilderW_Append(sbJws,L" \"payload\": \"SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu\",");
CkStringBuilderW_Append(sbJws,L" \"signatures\": [");
CkStringBuilderW_Append(sbJws,L" { ");
CkStringBuilderW_Append(sbJws,L" \"protected\": \"eyJhbGciOiJSUzI1NiIsImtpZCI6Im15UnNhS2V5In0\",");
CkStringBuilderW_Append(sbJws,L" \"signature\": \"IPMQ02niTQDwLzsRZSCaEm9VEyAX_AVe3HWjniNt9kW-a8d6ZVbd2k6jGae8s1yIh0cgxDnXQ6-p6_sBI0cnMO0xpuJANhh2vFtNJl5lisad94-H3mB3lSfafRqxeYp5D8bh39BPv7y3PrUNVMQdKEJp_D5oJ0ROPTIYx3EG8eJQOx1HO0KqhcUo401XR6KSsIyFm5joBLNKTVzxZUTT1RRZZtwTdeZkbGevugIOX_9gHAtARpV6WaFA4Vvjnq8X9wPgqjWNCQRupadhTPz0JAsa-wy5vXQjsFlXAn43mDPpMfna5Ab3F5pS4yDwkbX6nRn7XBxH1SnnNJRFholQZw\"");
CkStringBuilderW_Append(sbJws,L" },");
CkStringBuilderW_Append(sbJws,L" { ");
CkStringBuilderW_Append(sbJws,L" \"protected\": \"eyJhbGciOiJFUzI1NiIsImtpZCI6Im15RWNLZXkifQ\",");
CkStringBuilderW_Append(sbJws,L" \"signature\": \"1OQtaT3pgZmkDxvlfghvxL_8kX16WIen6u1MadEq1pA4qytA0--_EwZDNk00GDPWFpoJtKznibMZzLOg_UhHIw\"");
CkStringBuilderW_Append(sbJws,L" },");
CkStringBuilderW_Append(sbJws,L" { ");
CkStringBuilderW_Append(sbJws,L" \"protected\": \"eyJhbGciOiJIUzI1NiIsImtpZCI6Im15TWFjS2V5In0\",");
CkStringBuilderW_Append(sbJws,L" \"signature\": \"YY8yVjmJJfy7YJOn3uUydG8WCY2PEuCvOLil5Ks5lnw\"");
CkStringBuilderW_Append(sbJws,L" }");
CkStringBuilderW_Append(sbJws,L" ]");
CkStringBuilderW_Append(sbJws,L"}");
jws = CkJwsW_Create();
success = CkJwsW_LoadJwsSb(jws,sbJws);
if (success == FALSE) {
wprintf(L"%s\n",CkJwsW_lastErrorText(jws));
CkStringBuilderW_Dispose(sbRsaJwk);
CkPublicKeyW_Dispose(rsaKey);
CkStringBuilderW_Dispose(sbEccJwk);
CkPublicKeyW_Dispose(eccKey);
CkStringBuilderW_Dispose(sbJws);
CkJwsW_Dispose(jws);
return;
}
// The payload is easily accessible:
wprintf(L"Payload: %s\n",CkJwsW_getPayload(jws,L"utf-8"));
sbKeyId = CkStringBuilderW_Create();
bCaseSensitive = FALSE;
protHeader = CkJsonObjectW_Create();
numSignatures = CkJwsW_getNumSignatures(jws);
i = 0;
while (i < numSignatures) {
success = CkJwsW_GetProtectedH(jws,i,protHeader);
if (success == FALSE) {
wprintf(L"%s\n",CkJwsW_lastErrorText(jws));
CkStringBuilderW_Dispose(sbRsaJwk);
CkPublicKeyW_Dispose(rsaKey);
CkStringBuilderW_Dispose(sbEccJwk);
CkPublicKeyW_Dispose(eccKey);
CkStringBuilderW_Dispose(sbJws);
CkJwsW_Dispose(jws);
CkStringBuilderW_Dispose(sbKeyId);
CkJsonObjectW_Dispose(protHeader);
return;
}
wprintf(L"--------------------------\n");
wprintf(L"%d: \n",i);
// Get the protected header.
CkJsonObjectW_putEmitCompact(protHeader,FALSE);
wprintf(L"%s\n",CkJsonObjectW_emit(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).
CkStringBuilderW_Clear(sbKeyId);
CkStringBuilderW_Append(sbKeyId,CkJsonObjectW_stringOf(protHeader,L"kid"));
// Set the key based on key ID.
if (CkStringBuilderW_ContentsEqual(sbKeyId,L"myRsaKey",bCaseSensitive) == TRUE) {
CkJwsW_SetPublicKey(jws,i,rsaKey);
}
if (CkStringBuilderW_ContentsEqual(sbKeyId,L"myEcKey",bCaseSensitive) == TRUE) {
CkJwsW_SetPublicKey(jws,i,eccKey);
}
if (CkStringBuilderW_ContentsEqual(sbKeyId,L"myMacKey",bCaseSensitive) == TRUE) {
CkJwsW_SetMacKey(jws,i,hmacKey,L"base64url");
}
// Validate this signature.
v = CkJwsW_Validate(jws,i);
if (v < 0) {
// Perhaps Chilkat was not unlocked or the trial expired..
wprintf(L"Validate failed for some other reason.\n");
wprintf(L"%s\n",CkJwsW_lastErrorText(jws));
}
else {
if (v == 0) {
wprintf(L"Invalid signature. The key was incorrect, the JWS was invalid, or both.\n");
}
else {
wprintf(L"Signature validated.\n");
}
}
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.
CkStringBuilderW_Dispose(sbRsaJwk);
CkPublicKeyW_Dispose(rsaKey);
CkStringBuilderW_Dispose(sbEccJwk);
CkPublicKeyW_Dispose(eccKey);
CkStringBuilderW_Dispose(sbJws);
CkJwsW_Dispose(jws);
CkStringBuilderW_Dispose(sbKeyId);
CkJsonObjectW_Dispose(protHeader);
}