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(Unicode C) JWE using A256GCMKWThis example demonstrates creating a JCE with AES GCM key wrap.
#include <C_CkJweW.h> #include <C_CkJsonObjectW.h> #include <C_CkPrngW.h> void ChilkatSample(void) { BOOL success; const wchar_t *plaintext; HCkJweW jwe; HCkJsonObjectW jweProtHdr; HCkPrngW prng; const wchar_t *aesWrappingKey; 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. plaintext = L"My text to enrypt"; jwe = CkJweW_Create(); // First build the JWE Protected Header: // { // "alg": "A256GCMKW", // "kid": "18ec08e1-bfa9-4d95-b205-2b4dd1d4321d", // "tag": "kfPduVQ3T3H6vnewt--ksw", // "iv": "KkYT0GX_2jHlfqN_", // "enc": "A128CBC-HS256" // } jweProtHdr = CkJsonObjectW_Create(); CkJsonObjectW_AppendString(jweProtHdr,L"alg",L"A256GCMKW"); // kid is optional CkJsonObjectW_AppendString(jweProtHdr,L"kid",L"18ec08e1-bfa9-4d95-b205-2b4dd1d4321d"); // tag is optional CkJsonObjectW_AppendString(jweProtHdr,L"tag",L"kfPduVQ3T3H6vnewt--ksw"); CkJsonObjectW_AppendString(jweProtHdr,L"enc",L"A256GCM"); // the iv should be 16 random chars. prng = CkPrngW_Create(); CkJsonObjectW_AppendString(jweProtHdr,L"iv",CkPrngW_randomString(prng,16,TRUE,TRUE,TRUE)); CkJweW_SetProtectedHeader(jwe,jweProtHdr); wprintf(L"JWE Protected Header: %s\n",CkJsonObjectW_emit(jweProtHdr)); wprintf(L"--\n"); // Given that we have 256-bit AES, our key should be 32 bytes. // The ascii string here is 32 bytes, therefore the 2nd arg is "ascii" to use these // ascii chars directly as the key. aesWrappingKey = L"2baf4f730f5e4542b428593ef9cceb0e"; CkJweW_SetWrappingKey(jwe,0,aesWrappingKey,L"ascii"); // 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); CkPrngW_Dispose(prng); 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); CkPrngW_Dispose(prng); CkJweW_Dispose(jwe2); return; } // Set the AES wrap key. Important to use "ascii" CkJweW_SetWrappingKey(jwe2,0,aesWrappingKey,L"ascii"); // 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); CkPrngW_Dispose(prng); CkJweW_Dispose(jwe2); return; } wprintf(L"original text: \n"); wprintf(L"%s\n",originalPlaintext); CkJweW_Dispose(jwe); CkJsonObjectW_Dispose(jweProtHdr); CkPrngW_Dispose(prng); CkJweW_Dispose(jwe2); } |
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