Exemplo n.º 1
0
        public byte[] EncryptAssymetricByPublic(byte[] toEncrypt, String xmlPublic)
        {
            //Encode with public key
            RSACryptoServiceProvider rsaPublic = new RSACryptoServiceProvider();

            rsaPublic.FromXmlString(xmlPublic);


            SymmetricKey symmetricKey = GenerateSymmetricKey();

            byte[] encryptedKey = rsaPublic.Encrypt(symmetricKey.toByteArray(), false);

            byte[] encrypted = EncryptSymmetric(toEncrypt, symmetricKey);

            byte[] combined = new byte[2 + encryptedKey.Length + encrypted.Length];

            combined[0] = (byte)(encryptedKey.Length & 0x00FF);
            combined[1] = (byte)(encryptedKey.Length >> 8);


            for (int i = 0; i < encryptedKey.Length; i++)
            {
                combined[2 + i] = encryptedKey[i];
            }
            for (int i = 0; i < encrypted.Length; i++)
            {
                combined[2 + i + encryptedKey.Length] = encrypted[i];
            }
            return(combined);
        }