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(Unicode C) JWE with Binary DataDemonstrates how to create a JWE that contains a binary payload (such as a JPG image). Note: This example requires Chilkat v9.5.0.66 or greater.
#include <C_CkBinDataW.h> #include <C_CkJweW.h> #include <C_CkJsonObjectW.h> #include <C_CkStringBuilderW.h> void ChilkatSample(void) { BOOL success; HCkBinDataW jpgBytes; HCkJweW jwe; HCkJsonObjectW jweProtHdr; const wchar_t *aesWrappingKey; HCkStringBuilderW sbJwe; HCkJweW jwe2; HCkBinDataW jpgOriginal; // 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. // Load a JPG file that will be the JWE payload. jpgBytes = CkBinDataW_Create(); success = CkBinDataW_LoadFile(jpgBytes,L"qa_data/jpg/starfish.jpg"); // Make sure your app checks the success/failure of the call to LoadFile.. wprintf(L"Original JPG size = %d\n",CkBinDataW_getNumBytes(jpgBytes)); jwe = CkJweW_Create(); jweProtHdr = CkJsonObjectW_Create(); CkJsonObjectW_AppendString(jweProtHdr,L"alg",L"A128KW"); CkJsonObjectW_AppendString(jweProtHdr,L"enc",L"A128CBC-HS256"); CkJweW_SetProtectedHeader(jwe,jweProtHdr); aesWrappingKey = L"GawgguFyGrWKav7AX4VKUg"; CkJweW_SetWrappingKey(jwe,0,aesWrappingKey,L"base64url"); // Encrypt and return the JWE in sbJwe: sbJwe = CkStringBuilderW_Create(); success = CkJweW_EncryptBd(jwe,jpgBytes,sbJwe); if (success != TRUE) { wprintf(L"%s\n",CkJweW_lastErrorText(jwe)); CkBinDataW_Dispose(jpgBytes); CkJweW_Dispose(jwe); CkJsonObjectW_Dispose(jweProtHdr); CkStringBuilderW_Dispose(sbJwe); return; } // Show the JWE: wprintf(L"%s\n",CkStringBuilderW_getAsString(sbJwe)); wprintf(L"size of JWE: %d\n",CkStringBuilderW_getLength(sbJwe)); // --------------------------------------------------------- // Decrypt to get the original JPG file.. jwe2 = CkJweW_Create(); success = CkJweW_LoadJweSb(jwe2,sbJwe); if (success != TRUE) { wprintf(L"%s\n",CkJweW_lastErrorText(jwe2)); CkBinDataW_Dispose(jpgBytes); CkJweW_Dispose(jwe); CkJsonObjectW_Dispose(jweProtHdr); CkStringBuilderW_Dispose(sbJwe); CkJweW_Dispose(jwe2); return; } // Set the AES wrap key. CkJweW_SetWrappingKey(jwe2,0,aesWrappingKey,L"base64url"); // Decrypt. jpgOriginal = CkBinDataW_Create(); success = CkJweW_DecryptBd(jwe2,0,jpgOriginal); if (success != TRUE) { wprintf(L"%s\n",CkJweW_lastErrorText(jwe2)); CkBinDataW_Dispose(jpgBytes); CkJweW_Dispose(jwe); CkJsonObjectW_Dispose(jweProtHdr); CkStringBuilderW_Dispose(sbJwe); CkJweW_Dispose(jwe2); CkBinDataW_Dispose(jpgOriginal); return; } wprintf(L"Decrypted JPG size = %d\n",CkBinDataW_getNumBytes(jpgOriginal)); // Save the decrypted JPG to a file. success = CkBinDataW_WriteFile(jpgOriginal,L"qa_output/jwe_decrypted_starfish.jpg"); wprintf(L"success = %d\n",success); // The output of this program, when tested, was: // Original JPG size = 6229 // eyJhbGciOiJBMTI4S1ciLCJlbmMiOiJBMTI4Q0JDLUhTMjU2In0.9YFz_wteV ... 7Et3hKhpxnKEXw // size of JWE: 8473 // Decrypted JPG size = 6229 // success = True CkBinDataW_Dispose(jpgBytes); CkJweW_Dispose(jwe); CkJsonObjectW_Dispose(jweProtHdr); CkStringBuilderW_Dispose(sbJwe); CkJweW_Dispose(jwe2); CkBinDataW_Dispose(jpgOriginal); } |
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