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(Unicode C) JWE using "dir" Direct use of Shared Symmetric KeyDemonstrates how to create a JWE using the "dir" alg -- which is to directly use a shared symmetric key. Note: This example requires Chilkat v9.5.0.66 or greater.
#include <C_CkJweW.h> #include <C_CkJsonObjectW.h> void ChilkatSample(void) { BOOL success; const wchar_t *plaintext; HCkJweW jwe; HCkJsonObjectW jweProtHdr; int recipientIndex; const wchar_t *strJwe; HCkJweW jwe2; const wchar_t *originalPlaintext; // 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.. jweProtHdr = CkJsonObjectW_Create(); CkJsonObjectW_AppendString(jweProtHdr,L"alg",L"dir"); CkJsonObjectW_AppendString(jweProtHdr,L"enc",L"A128GCM"); // Don't forget to actually provide the protected header to the JWE object: CkJweW_SetProtectedHeader(jwe,jweProtHdr); // The JWE is to use 128-bit AES GCM encryption as specified by the "enc" parameter. // Given that the "alg" = "dir", we are to directly specify the AES GCM key. // (It is assumed that the decrypting side also has knowledge of the direct key to be used..) // Our key will be these 16 hex bytes: 000102030405060708090A0B0C0D0E0F // The SetWrappingKey method is also used for "dir" direct keys. // However, if there are multiple recipients, they must all share the same CEK (Content Encryption Key), // which is specified by calling SetWrappingKey with an index of 0. recipientIndex = 0; CkJweW_SetWrappingKey(jwe,recipientIndex,L"000102030405060708090A0B0C0D0E0F",L"hex"); // 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. 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; } CkJweW_SetWrappingKey(jwe2,0,L"000102030405060708090A0B0C0D0E0F",L"hex"); // 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); // Sample output: // eyJhbGciOiJkaXIiLCJlbmMiOiJBMTI4R0NNIn0..20HX5Huc7f1nQC4pBUtiCQ.axFZIxtZy5j0ifJQUzGXLKIpsBuxJA.eBrOC-NrsreN6JeGuOPk1g // original text: // Live long and prosper. CkJweW_Dispose(jwe); CkJsonObjectW_Dispose(jweProtHdr); CkJweW_Dispose(jwe2); } |
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