Exemplo n.º 1
0
 public BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO(byte[] iv, byte[] aad, byte[] tag)
 {
     this = new BCrypt.BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO()
     {
         dwInfoVersion = BCrypt.BCRYPT_INIT_AUTH_MODE_INFO_VERSION,
         cbSize        = Marshal.SizeOf(typeof(BCrypt.BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO))
     };
     if (iv != null)
     {
         this.cbNonce = (int)iv.Length;
         this.pbNonce = Marshal.AllocHGlobal(this.cbNonce);
         Marshal.Copy(iv, 0, this.pbNonce, this.cbNonce);
     }
     if (aad != null)
     {
         this.cbAuthData = (int)aad.Length;
         this.pbAuthData = Marshal.AllocHGlobal(this.cbAuthData);
         Marshal.Copy(aad, 0, this.pbAuthData, this.cbAuthData);
     }
     if (tag != null)
     {
         this.cbTag = (int)tag.Length;
         this.pbTag = Marshal.AllocHGlobal(this.cbTag);
         Marshal.Copy(tag, 0, this.pbTag, this.cbTag);
         this.cbMacContext = (int)tag.Length;
         this.pbMacContext = Marshal.AllocHGlobal(this.cbMacContext);
     }
 }
Exemplo n.º 2
0
        /// <summary>
        /// Performs AES encryption in GCM chaining mode over plain text
        /// </summary>
        /// <param name="key">aes key</param>
        /// <param name="iv">initialization vector</param>
        /// <param name="aad">additional authn data</param>
        /// <param name="plainText">plain text message to be encrypted</param>
        /// <returns>2 byte[] arrays: [0]=cipher text, [1]=authentication tag</returns>
        /// /// <exception cref="CryptographicException">if encryption failed by any reason</exception>
        public static byte[][] Encrypt(byte[] key, byte[] iv, byte[] aad, byte[] plainText)
        {
            IntPtr hAlg = OpenAlgorithmProvider(BCrypt.BCRYPT_AES_ALGORITHM, BCrypt.MS_PRIMITIVE_PROVIDER, BCrypt.BCRYPT_CHAIN_MODE_GCM);
            IntPtr hKey, keyDataBuffer = ImportKey(hAlg, key, out hKey);

            byte[] cipher;
            byte[] tag = new byte[MaxAuthTagSize(hAlg)];

            var authInfo = new BCrypt.BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO(iv, aad, tag);
            using (authInfo)
            {
                byte[] ivData = new byte[tag.Length];

                int cipherSize = 0;

                uint status = BCrypt.BCryptEncrypt(hKey, plainText, plainText.Length, ref authInfo, ivData, ivData.Length, null, 0, ref cipherSize, 0x0);

                if (status != BCrypt.ERROR_SUCCESS)
                    throw new CryptographicException(string.Format("BCrypt.BCryptEncrypt() (get size) failed with status code:{0}", status));

                cipher = new byte[cipherSize];

                status = BCrypt.BCryptEncrypt(hKey, plainText, plainText.Length, ref authInfo, ivData, ivData.Length,
                                              cipher, cipher.Length, ref cipherSize, 0x0);

                if (status != BCrypt.ERROR_SUCCESS)
                    throw new CryptographicException(string.Format("BCrypt.BCryptEncrypt() failed with status code:{0}", status));

                Marshal.Copy(authInfo.pbTag, tag, 0, authInfo.cbTag);
            }

            BCrypt.BCryptDestroyKey(hKey);
            Marshal.FreeHGlobal(keyDataBuffer);
            BCrypt.BCryptCloseAlgorithmProvider(hAlg, 0x0);

            return new[] {cipher, tag};
        }
Exemplo n.º 3
0
        /// <summary>
        /// Performs AES decryption in GCM chaning mode over cipher text
        /// </summary>
        /// <param name="key">aes key</param>
        /// <param name="iv">initialization vector</param>
        /// <param name="aad">additional authn data</param>
        /// <param name="plainText">plain text message to be encrypted</param>
        /// <returns>decrypted plain text messages</returns>
        /// <exception cref="CryptographicException">if decryption failed by any reason</exception>
        public static byte[] Decrypt(byte[] key, byte[] iv, byte[] aad, byte[] cipherText, byte[] authTag)
        {
            IntPtr hAlg = OpenAlgorithmProvider(BCrypt.BCRYPT_AES_ALGORITHM, BCrypt.MS_PRIMITIVE_PROVIDER, BCrypt.BCRYPT_CHAIN_MODE_GCM);
            IntPtr hKey,keyDataBuffer = ImportKey(hAlg, key, out hKey);

            byte[] plainText;

            var authInfo = new BCrypt.BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO(iv, aad, authTag);
            using (authInfo)
            {
                byte[] ivData = new byte[MaxAuthTagSize(hAlg)];

                int plainTextSize = 0;

                uint status = BCrypt.BCryptDecrypt(hKey, cipherText, cipherText.Length, ref authInfo, ivData, ivData.Length, null, 0, ref plainTextSize, 0x0);

                if (status != BCrypt.ERROR_SUCCESS)
                    throw new CryptographicException(string.Format("BCrypt.BCryptDecrypt() (get size) failed with status code: {0}", status));

                plainText = new byte[plainTextSize];

                status = BCrypt.BCryptDecrypt(hKey, cipherText, cipherText.Length, ref authInfo, ivData, ivData.Length, plainText, plainText.Length, ref plainTextSize, 0x0);

                if(status==BCrypt.STATUS_AUTH_TAG_MISMATCH)
                    throw new CryptographicException("BCrypt.BCryptDecrypt(): authentication tag mismatch");

                if (status != BCrypt.ERROR_SUCCESS)
                    throw new CryptographicException(string.Format("BCrypt.BCryptDecrypt() failed with status code:{0}", status));                
            }

            BCrypt.BCryptDestroyKey(hKey);
            Marshal.FreeHGlobal(keyDataBuffer);
            BCrypt.BCryptCloseAlgorithmProvider(hAlg, 0x0);

            return plainText;
        }
Exemplo n.º 4
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 public static extern uint BCryptEncrypt(IntPtr hKey, byte[] pbInput, int cbInput, ref BCrypt.BCRYPT_AUTHENTICATED_CIPHER_MODE_INFO pPaddingInfo, byte[] pbIV, int cbIV, byte[] pbOutput, int cbOutput, ref int pcbResult, uint dwFlags);