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(Unicode C) JWE using AES Key Wrap and AES_128_CBC_HMAC_SHA_256This example duplicates the example A.3 in RFC 7516 for JSON Web Encryption (JWE). Note: This example requires Chilkat v9.5.0.66 or greater.
#include <C_CkJweW.h> #include <C_CkJsonObjectW.h> #include <C_CkStringBuilderW.h> void ChilkatSample(void) { BOOL success; const wchar_t *plaintext; HCkJweW jwe; HCkJsonObjectW jweProtHdr; const wchar_t *aesWrappingKey; const wchar_t *strJwe; HCkJweW jwe2; const wchar_t *originalPlaintext; HCkStringBuilderW sbJwe; // 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."; jwe = CkJweW_Create(); // First build the JWE Protected Header: {"alg":"A128KW","enc":"A128CBC-HS256"} jweProtHdr = CkJsonObjectW_Create(); CkJsonObjectW_AppendString(jweProtHdr,L"alg",L"A128KW"); CkJsonObjectW_AppendString(jweProtHdr,L"enc",L"A128CBC-HS256"); CkJweW_SetProtectedHeader(jwe,jweProtHdr); wprintf(L"JWE Protected Header: %s\n",CkJsonObjectW_emit(jweProtHdr)); wprintf(L"--\n"); // The example A.3 in RFC 7516 uses the following 128-bit AES key, // specified in JWK (JSON Web Key) format: // {"kty":"oct", // "k":"GawgguFyGrWKav7AX4VKUg" // } // This is just a way of saying: The key type ("kty") is // a bunch of octets ("k") in base64url encoding. // We can simply set the AES wrapping key like this: aesWrappingKey = L"GawgguFyGrWKav7AX4VKUg"; CkJweW_SetWrappingKey(jwe,0,aesWrappingKey,L"base64url"); // Encrypt and return the JWE: strJwe = CkJweW_encrypt(jwe,plaintext,L"utf-8"); if (CkJweW_getLastMethodSuccess(jwe) != TRUE) { wprintf(L"%s\n",CkJweW_lastErrorText(jwe)); CkJweW_Dispose(jwe); CkJsonObjectW_Dispose(jweProtHdr); return; } // Show the JWE we just created: wprintf(L"%s\n",strJwe); // Decrypt the JWE that was just produced. // 1) Load the JWE. // 2) Set the AES wrapping key. // 3) Decrypt. jwe2 = CkJweW_Create(); success = CkJweW_LoadJwe(jwe2,strJwe); if (success != TRUE) { wprintf(L"%s\n",CkJweW_lastErrorText(jwe2)); CkJweW_Dispose(jwe); CkJsonObjectW_Dispose(jweProtHdr); CkJweW_Dispose(jwe2); return; } // Set the AES wrap key. CkJweW_SetWrappingKey(jwe2,0,aesWrappingKey,L"base64url"); // Decrypt. originalPlaintext = CkJweW_decrypt(jwe2,0,L"utf-8"); if (CkJweW_getLastMethodSuccess(jwe2) != TRUE) { wprintf(L"%s\n",CkJweW_lastErrorText(jwe2)); CkJweW_Dispose(jwe); CkJsonObjectW_Dispose(jweProtHdr); 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.3.7 // because it was produced using the same AES Wrap key. sbJwe = CkStringBuilderW_Create(); CkStringBuilderW_Append(sbJwe,L"eyJhbGciOiJBMTI4S1ciLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0."); CkStringBuilderW_Append(sbJwe,L"6KB707dM9YTIgHtLvtgWQ8mKwboJW3of9locizkDTHzBC2IlrT1oOQ."); CkStringBuilderW_Append(sbJwe,L"AxY8DCtDaGlsbGljb3RoZQ."); CkStringBuilderW_Append(sbJwe,L"KDlTtXchhZTGufMYmOYGS4HffxPSUrfmqCHXaI9wOGY."); CkStringBuilderW_Append(sbJwe,L"U0m_YmjN04DJvceFICbCVQ"); success = CkJweW_LoadJweSb(jwe2,sbJwe); if (success != TRUE) { wprintf(L"%s\n",CkJweW_lastErrorText(jwe2)); CkJweW_Dispose(jwe); CkJsonObjectW_Dispose(jweProtHdr); CkJweW_Dispose(jwe2); CkStringBuilderW_Dispose(sbJwe); return; } CkJweW_SetWrappingKey(jwe2,0,aesWrappingKey,L"base64url"); // Decrypt. originalPlaintext = CkJweW_decrypt(jwe2,0,L"utf-8"); if (CkJweW_getLastMethodSuccess(jwe2) != TRUE) { wprintf(L"%s\n",CkJweW_lastErrorText(jwe2)); CkJweW_Dispose(jwe); CkJsonObjectW_Dispose(jweProtHdr); CkJweW_Dispose(jwe2); CkStringBuilderW_Dispose(sbJwe); return; } wprintf(L"%s\n",originalPlaintext); CkJweW_Dispose(jwe); CkJsonObjectW_Dispose(jweProtHdr); CkJweW_Dispose(jwe2); CkStringBuilderW_Dispose(sbJwe); } |
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