コード例 #1
0
        internal override EncoderNode CreateEncoder()
        {
            var passwordAccess = default(PasswordAccessor);
            var encryptionKey  = default(byte[]);
            var passwordBytes  = default(byte[]);

            try
            {
                passwordAccess = mPassword.GetPassword();
                passwordBytes  = Encoding.Unicode.GetBytes(passwordAccess);
                encryptionKey  = Reader.AesArchiveDecoder.InitKey(mSlowdown, mSeed.mSalt, passwordBytes);

                using (var aes = System.Security.Cryptography.Aes.Create())
                {
                    aes.Mode    = System.Security.Cryptography.CipherMode.CBC;
                    aes.Padding = System.Security.Cryptography.PaddingMode.None;
                    return(new AesEncoderNode(aes.CreateEncryptor(encryptionKey, mSeed.mSeed16)));
                }
            }
            finally
            {
                passwordAccess.Dispose();
                Utilities.ClearBuffer(ref passwordBytes);
                Utilities.ClearBuffer(ref encryptionKey);
            }
        }
コード例 #2
0
        private void Initialize(Stream input, byte[] info, PasswordStorage password, long limit)
        {
            mBuffer = new byte[4 << 10];
            mStream = input;
            mLimit  = limit;

            // The 7z AES encoder/decoder classes do not perform padding, instead they require the input stream to provide a multiple of 16 bytes.
            // If the exception below is thrown this means the 7z file is either corrupt or a newer 7z version has been published and we haven't updated yet.
            if (((uint)input.Length & 15) != 0)
            {
                throw new NotSupportedException("7z requires AES streams to be properly padded.");
            }

            int numCyclesPower;

            byte[] salt, seed;
            Init(info, out numCyclesPower, out salt, out seed);

            byte[] pass = null;
            byte[] key  = null;
            try
            {
                using (var accessor = password.GetPassword())
                    pass = Encoding.Unicode.GetBytes(accessor);

                key = InitKey(numCyclesPower, salt, pass);

                using (var aes = Aes.Create())
                {
                    aes.Mode    = CipherMode.CBC;
                    aes.Padding = PaddingMode.None;
                    mDecoder    = aes.CreateDecryptor(key, seed);
                }
            }
            finally
            {
                Utilities.ClearBuffer(ref pass);
                Utilities.ClearBuffer(ref key);
            }
        }
コード例 #3
0
        private void Initialize(Stream input, byte[] info, PasswordStorage password, long limit)
        {
            mBuffer = new byte[4 << 10];
            mStream = input;
            mLimit = limit;

            // The 7z AES encoder/decoder classes do not perform padding, instead they require the input stream to provide a multiple of 16 bytes.
            // If the exception below is thrown this means the 7z file is either corrupt or a newer 7z version has been published and we haven't updated yet.
            if (((uint)input.Length & 15) != 0)
                throw new NotSupportedException("7z requires AES streams to be properly padded.");

            int numCyclesPower;
            byte[] salt, seed;
            Init(info, out numCyclesPower, out salt, out seed);

            byte[] pass = null;
            byte[] key = null;
            try
            {
                using (var accessor = password.GetPassword())
                    pass = Encoding.Unicode.GetBytes(accessor);

                key = InitKey(numCyclesPower, salt, pass);

                using (var aes = Aes.Create())
                {
                    aes.Mode = CipherMode.CBC;
                    aes.Padding = PaddingMode.None;
                    mDecoder = aes.CreateDecryptor(key, seed);
                }
            }
            finally
            {
                Utilities.ClearBuffer(ref pass);
                Utilities.ClearBuffer(ref key);
            }
        }