(Unicode C++) JWE using ECDH-ES, BP-256, A256GCM

See more JSON Web Encryption (JWE) Examples

Create a JWE with the following header:

	{
	  "alg": "ECDH-ES",
	  "enc": "A256GCM",
	  "exp": 1621957030,
	  "cty": "NJWT",
	  "epk": {
	    "kty": "EC",
	    "x": "QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w"
	    "y": "AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu"
	    "crv": "BP-256"
	  }
	}

Note: This example requires Chilkat v9.5.0.87 or greater.

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#include <CkJsonObjectW.h>
#include <CkPublicKeyW.h>
#include <CkJwtW.h>
#include <CkJweW.h>

void ChilkatSample(void)
    {
    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    bool success;

    // Load our brainpool BP-256 public key.

    // 	{
    // 	  "use": "enc",
    // 	  "kid": "puk_idp_enc",
    // 	  "kty": "EC",
    // 	  "crv": "BP-256",
    // 	  "x": "QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w",
    // 	  "y": "AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu"
    // 	}

    CkJsonObjectW json;
    json.UpdateString(L"use",L"enc");
    json.UpdateString(L"kid",L"puk_idp_enc");
    json.UpdateString(L"kty",L"EC");
    json.UpdateString(L"crv",L"BP-256");
    json.UpdateString(L"x",L"QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w");
    json.UpdateString(L"y",L"AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu");

    CkPublicKeyW pubkey;

    success = pubkey.LoadFromString(json.emit());
    if (success == false) {
        wprintf(L"%s\n",pubkey.lastErrorText());
        return;
    }

    // Build our protected header:

    // 	{
    // 	  "alg": "ECDH-ES",
    // 	  "enc": "A256GCM",
    // 	  "exp": 1621957030,
    // 	  "cty": "NJWT",
    // 	  "epk": {
    // 	    "kty": "EC",
    // 	    "x": "QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w"
    // 	    "y": "AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu"
    // 	    "crv": "BP-256"
    // 	  }
    // 	}

    // Use jwt only for getting the current date/time + 3600 seconds.
    CkJwtW jwt;

    CkJsonObjectW jweProtHdr;
    jweProtHdr.UpdateString(L"alg",L"ECDH-ES");
    jweProtHdr.UpdateString(L"enc",L"A256GCM");
    jweProtHdr.UpdateInt(L"exp",jwt.GenNumericDate(3600));
    jweProtHdr.UpdateString(L"cty",L"NJWT");
    jweProtHdr.UpdateString(L"epk.kty",L"EC");
    jweProtHdr.UpdateString(L"epk.x",L"QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w");
    jweProtHdr.UpdateString(L"epk.y",L"AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu");
    jweProtHdr.UpdateString(L"epk.crv",L"BP-256");

    CkJweW jwe;
    jwe.SetProtectedHeader(jweProtHdr);
    jwe.SetPublicKey(0,pubkey);

    const wchar_t *plainText = L"This is the text to be encrypted.";
    const wchar_t *strJwe = jwe.encrypt(plainText,L"utf-8");
    if (jwe.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",jwe.lastErrorText());
        return;
    }

    wprintf(L"%s\n",strJwe);

    wprintf(L"Success.\n");
    }