Go

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.

Go

    success := false

    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Load our brainpool BP-256 public key.

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

    json := chilkat.NewJsonObject()
    json.UpdateString("use","enc")
    json.UpdateString("kid","puk_idp_enc")
    json.UpdateString("kty","EC")
    json.UpdateString("crv","BP-256")
    json.UpdateString("x","QLpJ_LpFx-6yJhsb4OvHwU1khLnviiOwYOvmf5clK7w")
    json.UpdateString("y","AJh7pJ3zZKDJkm8rbeG69GBooTosXJgSsvNFH0i3Vxnu")

    pubkey := chilkat.NewPublicKey()

    success = pubkey.LoadFromString(*json.Emit())
    if success == false {
        fmt.Println(pubkey.LastErrorText())
        json.DisposeJsonObject()
        pubkey.DisposePublicKey()
        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.
    jwt := chilkat.NewJwt()

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

    jwe := chilkat.NewJwe()
    jwe.SetProtectedHeader(jweProtHdr)
    jwe.SetPublicKey(0,pubkey)

    plainText := "This is the text to be encrypted."
    strJwe := jwe.Encrypt(plainText,"utf-8")
    if jwe.LastMethodSuccess() != true {
        fmt.Println(jwe.LastErrorText())
        json.DisposeJsonObject()
        pubkey.DisposePublicKey()
        jwt.DisposeJwt()
        jweProtHdr.DisposeJsonObject()
        jwe.DisposeJwe()
        return
    }

    fmt.Println(*strJwe)

    fmt.Println("Success.")

    json.DisposeJsonObject()
    pubkey.DisposePublicKey()
    jwt.DisposeJwt()
    jweProtHdr.DisposeJsonObject()
    jwe.DisposeJwe()