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(C) Validate JWS with Multiple Signatures using the General JSON Serialization FormatValidates 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 | | +--------------+-------------------------------+--------------------+ Note: This example requires Chilkat v9.5.0.66 or greater.
#include <C_CkStringBuilder.h> #include <C_CkPublicKey.h> #include <C_CkJws.h> #include <C_CkJsonObject.h> void ChilkatSample(void) { HCkStringBuilder sbRsaJwk; HCkPublicKey rsaKey; BOOL success; HCkStringBuilder sbEccJwk; HCkPublicKey eccKey; const char *hmacKey; HCkStringBuilder sbJws; HCkJws jws; HCkJsonObject protHeader; HCkStringBuilder sbKeyId; BOOL bCaseSensitive; int numSignatures; int i; int v; // This requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Note: This example requires Chilkat v9.5.0.66 or greater. // First, prepare the public keys that will be needed for each signature. // --------------------------------------------------- // Use the following RSA key loaded from JWK format. sbRsaJwk = CkStringBuilder_Create(); CkStringBuilder_Append(sbRsaJwk,"{\"kty\":\"RSA\","); CkStringBuilder_Append(sbRsaJwk,"\"n\":\"ofgWCuLjybRlzo0tZWJjNiuSfb4p4fAkd_wWJcyQoTbji9k0l8W26mPddx"); CkStringBuilder_Append(sbRsaJwk,"HmfHQp-Vaw-4qPCJrcS2mJPMEzP1Pt0Bm4d4QlL-yRT-SFd2lZS-pCgNMs"); CkStringBuilder_Append(sbRsaJwk,"D1W_YpRPEwOWvG6b32690r2jZ47soMZo9wGzjb_7OMg0LOL-bSf63kpaSH"); CkStringBuilder_Append(sbRsaJwk,"SXndS5z5rexMdbBYUsLA9e-KXBdQOS-UTo7WTBEMa2R2CapHg665xsmtdV"); CkStringBuilder_Append(sbRsaJwk,"MTBQY4uDZlxvb3qCo5ZwKh9kG4LT6_I5IhlJH7aGhyxXFvUK-DWNmoudF8"); CkStringBuilder_Append(sbRsaJwk,"NAco9_h9iaGNj8q2ethFkMLs91kzk2PAcDTW9gb54h4FRWyuXpoQ\","); CkStringBuilder_Append(sbRsaJwk,"\"e\":\"AQAB\""); CkStringBuilder_Append(sbRsaJwk,"}"); rsaKey = CkPublicKey_Create(); success = CkPublicKey_LoadFromString(rsaKey,CkStringBuilder_getAsString(sbRsaJwk)); if (success != TRUE) { printf("%s\n",CkPublicKey_lastErrorText(rsaKey)); CkStringBuilder_Dispose(sbRsaJwk); CkPublicKey_Dispose(rsaKey); return; } // --------------------------------------------------- // Use the following ECC public key loaded from JWK format. sbEccJwk = CkStringBuilder_Create(); CkStringBuilder_Append(sbEccJwk,"{\"kty\":\"EC\","); CkStringBuilder_Append(sbEccJwk,"\"crv\":\"P-256\","); CkStringBuilder_Append(sbEccJwk,"\"x\":\"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU\","); CkStringBuilder_Append(sbEccJwk,"\"y\":\"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0\""); CkStringBuilder_Append(sbEccJwk,"}"); eccKey = CkPublicKey_Create(); success = CkPublicKey_LoadFromString(eccKey,CkStringBuilder_getAsString(sbEccJwk)); if (success != TRUE) { printf("%s\n",CkPublicKey_lastErrorText(eccKey)); CkStringBuilder_Dispose(sbRsaJwk); CkPublicKey_Dispose(rsaKey); CkStringBuilder_Dispose(sbEccJwk); CkPublicKey_Dispose(eccKey); 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 = CkStringBuilder_Create(); CkStringBuilder_Append(sbJws,"{ "); CkStringBuilder_Append(sbJws," \"payload\": \"SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu\","); CkStringBuilder_Append(sbJws," \"signatures\": ["); CkStringBuilder_Append(sbJws," { "); CkStringBuilder_Append(sbJws," \"protected\": \"eyJhbGciOiJSUzI1NiIsImtpZCI6Im15UnNhS2V5In0\","); CkStringBuilder_Append(sbJws," \"signature\": \"IPMQ02niTQDwLzsRZSCaEm9VEyAX_AVe3HWjniNt9kW-a8d6ZVbd2k6jGae8s1yIh0cgxDnXQ6-p6_sBI0cnMO0xpuJANhh2vFtNJl5lisad94-H3mB3lSfafRqxeYp5D8bh39BPv7y3PrUNVMQdKEJp_D5oJ0ROPTIYx3EG8eJQOx1HO0KqhcUo401XR6KSsIyFm5joBLNKTVzxZUTT1RRZZtwTdeZkbGevugIOX_9gHAtARpV6WaFA4Vvjnq8X9wPgqjWNCQRupadhTPz0JAsa-wy5vXQjsFlXAn43mDPpMfna5Ab3F5pS4yDwkbX6nRn7XBxH1SnnNJRFholQZw\""); CkStringBuilder_Append(sbJws," },"); CkStringBuilder_Append(sbJws," { "); CkStringBuilder_Append(sbJws," \"protected\": \"eyJhbGciOiJFUzI1NiIsImtpZCI6Im15RWNLZXkifQ\","); CkStringBuilder_Append(sbJws," \"signature\": \"1OQtaT3pgZmkDxvlfghvxL_8kX16WIen6u1MadEq1pA4qytA0--_EwZDNk00GDPWFpoJtKznibMZzLOg_UhHIw\""); CkStringBuilder_Append(sbJws," },"); CkStringBuilder_Append(sbJws," { "); CkStringBuilder_Append(sbJws," \"protected\": \"eyJhbGciOiJIUzI1NiIsImtpZCI6Im15TWFjS2V5In0\","); CkStringBuilder_Append(sbJws," \"signature\": \"YY8yVjmJJfy7YJOn3uUydG8WCY2PEuCvOLil5Ks5lnw\""); CkStringBuilder_Append(sbJws," }"); CkStringBuilder_Append(sbJws," ]"); CkStringBuilder_Append(sbJws,"}"); jws = CkJws_Create(); success = CkJws_LoadJwsSb(jws,sbJws); if (success != TRUE) { printf("%s\n",CkJws_lastErrorText(jws)); CkStringBuilder_Dispose(sbRsaJwk); CkPublicKey_Dispose(rsaKey); CkStringBuilder_Dispose(sbEccJwk); CkPublicKey_Dispose(eccKey); CkStringBuilder_Dispose(sbJws); CkJws_Dispose(jws); return; } // The payload is easily accessible: printf("Payload: %s\n",CkJws_getPayload(jws,"utf-8")); sbKeyId = CkStringBuilder_Create(); bCaseSensitive = FALSE; numSignatures = CkJws_getNumSignatures(jws); i = 0; while (i < numSignatures) { protHeader = CkJws_GetProtectedHeader(jws,i); printf("--------------------------\n"); printf("%d: \n",i); // Get the protected header. CkJsonObject_putEmitCompact(protHeader,FALSE); printf("%s\n",CkJsonObject_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 GetUnprotectedHeader(i) instead of GetProtectedHeader(i). CkStringBuilder_Clear(sbKeyId); CkStringBuilder_Append(sbKeyId,CkJsonObject_stringOf(protHeader,"kid")); // Set the key based on key ID. if (CkStringBuilder_ContentsEqual(sbKeyId,"myRsaKey",bCaseSensitive) == TRUE) { CkJws_SetPublicKey(jws,i,rsaKey); } if (CkStringBuilder_ContentsEqual(sbKeyId,"myEcKey",bCaseSensitive) == TRUE) { CkJws_SetPublicKey(jws,i,eccKey); } if (CkStringBuilder_ContentsEqual(sbKeyId,"myMacKey",bCaseSensitive) == TRUE) { CkJws_SetMacKey(jws,i,hmacKey,"base64url"); } // Validate this signature. v = CkJws_Validate(jws,i); if (v < 0) { // Perhaps Chilkat was not unlocked or the trial expired.. printf("Validate failed for some other reason.\n"); printf("%s\n",CkJws_lastErrorText(jws)); } else { if (v == 0) { printf("Invalid signature. The key was incorrect, the JWS was invalid, or both.\n"); } else { printf("Signature validated.\n"); } } CkJsonObject_Dispose(protHeader); 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. CkStringBuilder_Dispose(sbRsaJwk); CkPublicKey_Dispose(rsaKey); CkStringBuilder_Dispose(sbEccJwk); CkPublicKey_Dispose(eccKey); CkStringBuilder_Dispose(sbJws); CkJws_Dispose(jws); CkStringBuilder_Dispose(sbKeyId); } |
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