Unicode C
Unicode C
JWE using RSAES-PKCS1-v1_5 and AES_128_CBC_HMAC_SHA_256
See more JSON Web Encryption (JWE) Examples
This example duplicates the example A.2 in RFC 7516 for JSON Web Encryption (JWE).Chilkat Unicode C Downloads
#include <C_CkJsonObjectW.h>
#include <C_CkStringBuilderW.h>
#include <C_CkPrivateKeyW.h>
#include <C_CkPublicKeyW.h>
#include <C_CkJweW.h>
void ChilkatSample(void)
{
BOOL success;
const wchar_t *plaintext;
HCkJsonObjectW jweProtHdr;
HCkStringBuilderW sbJwk;
HCkPrivateKeyW rsaPrivKey;
HCkPublicKeyW rsaPubKey;
HCkJweW jwe;
const wchar_t *strJwe;
HCkJweW jwe2;
const wchar_t *originalPlaintext;
HCkStringBuilderW sbJwe;
success = FALSE;
// 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.
plaintext = L"Live long and prosper.";
// First build the JWE Protected Header.
// We want to build this: {"alg":"RSA1_5","enc":"A128CBC-HS256"}
jweProtHdr = CkJsonObjectW_Create();
CkJsonObjectW_AppendString(jweProtHdr,L"alg",L"RSA1_5");
CkJsonObjectW_AppendString(jweProtHdr,L"enc",L"A128CBC-HS256");
wprintf(L"JWE Protected Header: %s\n",CkJsonObjectW_emit(jweProtHdr));
wprintf(L"--\n");
// The specific RSA key used in the A.2 example is the following JWK:
sbJwk = CkStringBuilderW_Create();
CkStringBuilderW_Append(sbJwk,L"{\"kty\":\"RSA\",");
CkStringBuilderW_Append(sbJwk,L"\"n\":\"sXchDaQebHnPiGvyDOAT4saGEUetSyo9MKLOoWFsueri23bOdgWp4Dy1Wl");
CkStringBuilderW_Append(sbJwk,L"UzewbgBHod5pcM9H95GQRV3JDXboIRROSBigeC5yjU1hGzHHyXss8UDpre");
CkStringBuilderW_Append(sbJwk,L"cbAYxknTcQkhslANGRUZmdTOQ5qTRsLAt6BTYuyvVRdhS8exSZEy_c4gs_");
CkStringBuilderW_Append(sbJwk,L"7svlJJQ4H9_NxsiIoLwAEk7-Q3UXERGYw_75IDrGA84-lA_-Ct4eTlXHBI");
CkStringBuilderW_Append(sbJwk,L"Y2EaV7t7LjJaynVJCpkv4LKjTTAumiGUIuQhrNhZLuF_RJLqHpM2kgWFLU");
CkStringBuilderW_Append(sbJwk,L"7-VTdL1VbC2tejvcI2BlMkEpk1BzBZI0KQB0GaDWFLN-aEAw3vRw\",");
CkStringBuilderW_Append(sbJwk,L"\"e\":\"AQAB\",");
CkStringBuilderW_Append(sbJwk,L"\"d\":\"VFCWOqXr8nvZNyaaJLXdnNPXZKRaWCjkU5Q2egQQpTBMwhprMzWzpR8Sxq");
CkStringBuilderW_Append(sbJwk,L"1OPThh_J6MUD8Z35wky9b8eEO0pwNS8xlh1lOFRRBoNqDIKVOku0aZb-ry");
CkStringBuilderW_Append(sbJwk,L"nq8cxjDTLZQ6Fz7jSjR1Klop-YKaUHc9GsEofQqYruPhzSA-QgajZGPbE_");
CkStringBuilderW_Append(sbJwk,L"0ZaVDJHfyd7UUBUKunFMScbflYAAOYJqVIVwaYR5zWEEceUjNnTNo_CVSj");
CkStringBuilderW_Append(sbJwk,L"-VvXLO5VZfCUAVLgW4dpf1SrtZjSt34YLsRarSb127reG_DUwg9Ch-Kyvj");
CkStringBuilderW_Append(sbJwk,L"T1SkHgUWRVGcyly7uvVGRSDwsXypdrNinPA4jlhoNdizK2zF2CWQ\",");
CkStringBuilderW_Append(sbJwk,L"\"p\":\"9gY2w6I6S6L0juEKsbeDAwpd9WMfgqFoeA9vEyEUuk4kLwBKcoe1x4HG68");
CkStringBuilderW_Append(sbJwk,L"ik918hdDSE9vDQSccA3xXHOAFOPJ8R9EeIAbTi1VwBYnbTp87X-xcPWlEP");
CkStringBuilderW_Append(sbJwk,L"krdoUKW60tgs1aNd_Nnc9LEVVPMS390zbFxt8TN_biaBgelNgbC95sM\",");
CkStringBuilderW_Append(sbJwk,L"\"q\":\"uKlCKvKv_ZJMVcdIs5vVSU_6cPtYI1ljWytExV_skstvRSNi9r66jdd9-y");
CkStringBuilderW_Append(sbJwk,L"BhVfuG4shsp2j7rGnIio901RBeHo6TPKWVVykPu1iYhQXw1jIABfw-MVsN");
CkStringBuilderW_Append(sbJwk,L"-3bQ76WLdt2SDxsHs7q7zPyUyHXmps7ycZ5c72wGkUwNOjYelmkiNS0\",");
CkStringBuilderW_Append(sbJwk,L"\"dp\":\"w0kZbV63cVRvVX6yk3C8cMxo2qCM4Y8nsq1lmMSYhG4EcL6FWbX5h9yuv");
CkStringBuilderW_Append(sbJwk,L"ngs4iLEFk6eALoUS4vIWEwcL4txw9LsWH_zKI-hwoReoP77cOdSL4AVcra");
CkStringBuilderW_Append(sbJwk,L"Hawlkpyd2TWjE5evgbhWtOxnZee3cXJBkAi64Ik6jZxbvk-RR3pEhnCs\",");
CkStringBuilderW_Append(sbJwk,L"\"dq\":\"o_8V14SezckO6CNLKs_btPdFiO9_kC1DsuUTd2LAfIIVeMZ7jn1Gus_Ff");
CkStringBuilderW_Append(sbJwk,L"7B7IVx3p5KuBGOVF8L-qifLb6nQnLysgHDh132NDioZkhH7mI7hPG-PYE_");
CkStringBuilderW_Append(sbJwk,L"odApKdnqECHWw0J-F0JWnUd6D2B_1TvF9mXA2Qx-iGYn8OVV1Bsmp6qU\",");
CkStringBuilderW_Append(sbJwk,L"\"qi\":\"eNho5yRBEBxhGBtQRww9QirZsB66TrfFReG_CcteI1aCneT0ELGhYlRlC");
CkStringBuilderW_Append(sbJwk,L"tUkTRclIfuEPmNsNDPbLoLqqCVznFbvdB7x-Tl-m0l_eFTj2KiqwGqE9PZ");
CkStringBuilderW_Append(sbJwk,L"B9nNTwMVvH3VRRSLWACvPnSiwP8N5Usy-WRXS-V7TbpxIhvepTfE0NNo\"");
CkStringBuilderW_Append(sbJwk,L"}");
// Load this JWK into a Chilkat private key object.
rsaPrivKey = CkPrivateKeyW_Create();
success = CkPrivateKeyW_LoadJwk(rsaPrivKey,CkStringBuilderW_getAsString(sbJwk));
if (success == FALSE) {
wprintf(L"%s\n",CkPrivateKeyW_lastErrorText(rsaPrivKey));
CkJsonObjectW_Dispose(jweProtHdr);
CkStringBuilderW_Dispose(sbJwk);
CkPrivateKeyW_Dispose(rsaPrivKey);
return;
}
// The public key is used to encrypt (i.e. create the JWE),
// and the private key is used to decrypt.
// The RSA public key is simply a subset of the private key. The RSA public key
// is composed of the "n" and "e" members shown above. These are also known as the
// modulus and exponent.
// We can simply get the public key object from the private key object
rsaPubKey = CkPublicKeyW_Create();
CkPrivateKeyW_ToPublicKey(rsaPrivKey,rsaPubKey);
// Create the JWE...
jwe = CkJweW_Create();
CkJweW_SetProtectedHeader(jwe,jweProtHdr);
CkJweW_SetPublicKey(jwe,0,rsaPubKey);
strJwe = CkJweW_encrypt(jwe,plaintext,L"utf-8");
if (CkJweW_getLastMethodSuccess(jwe) == FALSE) {
wprintf(L"%s\n",CkJweW_lastErrorText(jwe));
CkJsonObjectW_Dispose(jweProtHdr);
CkStringBuilderW_Dispose(sbJwk);
CkPrivateKeyW_Dispose(rsaPrivKey);
CkPublicKeyW_Dispose(rsaPubKey);
CkJweW_Dispose(jwe);
return;
}
// Show the JWE we just created:
wprintf(L"%s\n",strJwe);
// Note: The RSA PKCS1_V1_5 padding uses random value, and the results
// will be different each time. However, each result should be successfully
// decrypting if using the correct RSA private key.
// Let's decrypt the JWE that was just produced.
// Do the following to decrypt a JWE:
// 1) Load the JWE.
// 2) Set the private key for decryption.
// 3) Decrypt.
jwe2 = CkJweW_Create();
success = CkJweW_LoadJwe(jwe2,strJwe);
if (success == FALSE) {
wprintf(L"%s\n",CkJweW_lastErrorText(jwe2));
CkJsonObjectW_Dispose(jweProtHdr);
CkStringBuilderW_Dispose(sbJwk);
CkPrivateKeyW_Dispose(rsaPrivKey);
CkPublicKeyW_Dispose(rsaPubKey);
CkJweW_Dispose(jwe);
CkJweW_Dispose(jwe2);
return;
}
// Provide the RSA private key for decryption.
// (The JWE was encrypted for a single recipient at index 0.)
CkJweW_SetPrivateKey(jwe2,0,rsaPrivKey);
// Decrypt.
originalPlaintext = CkJweW_decrypt(jwe2,0,L"utf-8");
if (CkJweW_getLastMethodSuccess(jwe2) == FALSE) {
wprintf(L"%s\n",CkJweW_lastErrorText(jwe2));
CkJsonObjectW_Dispose(jweProtHdr);
CkStringBuilderW_Dispose(sbJwk);
CkPrivateKeyW_Dispose(rsaPrivKey);
CkPublicKeyW_Dispose(rsaPubKey);
CkJweW_Dispose(jwe);
CkJweW_Dispose(jwe2);
return;
}
wprintf(L"original text: \n");
wprintf(L"%s\n",originalPlaintext);
// ---------------------------------------------------------------------------------
// It should also be possible to decrypt the JWE as shown in RFC 7516, Appendix A.2.7
// because it was produced using the same RSA key.
sbJwe = CkStringBuilderW_Create();
CkStringBuilderW_Append(sbJwe,L"eyJhbGciOiJSU0ExXzUiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0.");
CkStringBuilderW_Append(sbJwe,L"UGhIOguC7IuEvf_NPVaXsGMoLOmwvc1GyqlIKOK1nN94nHPoltGRhWhw7Zx0-kFm");
CkStringBuilderW_Append(sbJwe,L"1NJn8LE9XShH59_i8J0PH5ZZyNfGy2xGdULU7sHNF6Gp2vPLgNZ__deLKxGHZ7Pc");
CkStringBuilderW_Append(sbJwe,L"HALUzoOegEI-8E66jX2E4zyJKx-YxzZIItRzC5hlRirb6Y5Cl_p-ko3YvkkysZIF");
CkStringBuilderW_Append(sbJwe,L"NPccxRU7qve1WYPxqbb2Yw8kZqa2rMWI5ng8OtvzlV7elprCbuPhcCdZ6XDP0_F8");
CkStringBuilderW_Append(sbJwe,L"rkXds2vE4X-ncOIM8hAYHHi29NX0mcKiRaD0-D-ljQTP-cFPgwCp6X-nZZd9OHBv");
CkStringBuilderW_Append(sbJwe,L"-B3oWh2TbqmScqXMR4gp_A.");
CkStringBuilderW_Append(sbJwe,L"AxY8DCtDaGlsbGljb3RoZQ.");
CkStringBuilderW_Append(sbJwe,L"KDlTtXchhZTGufMYmOYGS4HffxPSUrfmqCHXaI9wOGY.");
CkStringBuilderW_Append(sbJwe,L"9hH0vgRfYgPnAHOd8stkvw");
success = CkJweW_LoadJweSb(jwe2,sbJwe);
if (success == FALSE) {
wprintf(L"%s\n",CkJweW_lastErrorText(jwe2));
CkJsonObjectW_Dispose(jweProtHdr);
CkStringBuilderW_Dispose(sbJwk);
CkPrivateKeyW_Dispose(rsaPrivKey);
CkPublicKeyW_Dispose(rsaPubKey);
CkJweW_Dispose(jwe);
CkJweW_Dispose(jwe2);
CkStringBuilderW_Dispose(sbJwe);
return;
}
// Provide the RSA private key for decryption.
CkJweW_SetPrivateKey(jwe2,0,rsaPrivKey);
// Decrypt.
originalPlaintext = CkJweW_decrypt(jwe2,0,L"utf-8");
if (CkJweW_getLastMethodSuccess(jwe2) == FALSE) {
wprintf(L"%s\n",CkJweW_lastErrorText(jwe2));
CkJsonObjectW_Dispose(jweProtHdr);
CkStringBuilderW_Dispose(sbJwk);
CkPrivateKeyW_Dispose(rsaPrivKey);
CkPublicKeyW_Dispose(rsaPubKey);
CkJweW_Dispose(jwe);
CkJweW_Dispose(jwe2);
CkStringBuilderW_Dispose(sbJwe);
return;
}
wprintf(L"%s\n",originalPlaintext);
CkJsonObjectW_Dispose(jweProtHdr);
CkStringBuilderW_Dispose(sbJwk);
CkPrivateKeyW_Dispose(rsaPrivKey);
CkPublicKeyW_Dispose(rsaPubKey);
CkJweW_Dispose(jwe);
CkJweW_Dispose(jwe2);
CkStringBuilderW_Dispose(sbJwe);
}