Internal implementation of Rijndael. This class is returned from Rijndael.Create() instead of the public RijndaelManaged to be consistent with the rest of the static Create() methods which return opaque types. They both have have the same implementation.
Inheritance: Rijndael2
RijndaelImplementation Class Documentation
Beispiel #1
0
        /// <summary>
        /// Constructor.
        /// </summary>
        /// <param name="key">Password string</param>
        /// <param name="saltBytes">Random bytes, length depends on encryption strength.
        /// 128 bits = 8 bytes, 192 bits = 12 bytes, 256 bits = 16 bytes.</param>
        /// <param name="blockSize">The encryption strength, in bytes eg 16 for 128 bits.</param>
        /// <param name="writeMode">True when creating a zip, false when reading. For the AuthCode.</param>
        ///
        public ZipAESTransform(string key, byte[] saltBytes, int blockSize, bool writeMode)
        {
            if (blockSize != 16 && blockSize != 32) // 24 valid for AES but not supported by Winzip
            {
                throw new Exception("Invalid blocksize " + blockSize + ". Must be 16 or 32.");
            }
            if (saltBytes.Length != blockSize / 2)
            {
                throw new Exception("Invalid salt len. Must be " + blockSize / 2 + " for blocksize " + blockSize);
            }
            // initialise the encryption buffer and buffer pos
            _blockSize     = blockSize;
            _encryptBuffer = new byte[_blockSize];
            _encrPos       = ENCRYPT_BLOCK;

            // Performs the equivalent of derive_key in Dr Brian Gladman's pwd2key.c
            var pdb = new Rfc2898DeriveBytes(key, saltBytes, KEY_ROUNDS);
            var rm  = new RijndaelImplementation();

            rm.Mode       = CipherMode.ECB; // No feedback from cipher for CTR mode
            _counterNonce = new byte[_blockSize];
            byte[] byteKey1 = pdb.GetBytes(_blockSize);
            byte[] byteKey2 = pdb.GetBytes(_blockSize);
            _encryptor   = rm.CreateEncryptor(byteKey1, byteKey2);
            _pwdVerifier = pdb.GetBytes(PWD_VER_LENGTH);
            //

#if !OS_WINDOWS
            incrementalHash = IncrementalHash.CreateHMAC(HashAlgorithmName.SHA1, byteKey2);
#else
            _hmacsha1 = new HMACSHA1(byteKey2);
#endif
            _writeMode = writeMode;
        }
Beispiel #2
0
        /// <summary>
        /// Constructor.
        /// </summary>
        /// <param name="key">Password string</param>
        /// <param name="saltBytes">Random bytes, length depends on encryption strength.
        /// 128 bits = 8 bytes, 192 bits = 12 bytes, 256 bits = 16 bytes.</param>
        /// <param name="blockSize">The encryption strength, in bytes eg 16 for 128 bits.</param>
        /// <param name="writeMode">True when creating a zip, false when reading. For the AuthCode.</param>
        ///
        public ZipAESTransform(string key, byte[] saltBytes, int blockSize, bool writeMode) {
            if (blockSize!=16&&blockSize!=32) // 24 valid for AES but not supported by Winzip
                throw new Exception("Invalid blocksize "+blockSize+". Must be 16 or 32.");
            if (saltBytes.Length!=blockSize/2)
                throw new Exception("Invalid salt len. Must be "+blockSize/2+" for blocksize "+blockSize);
            // initialise the encryption buffer and buffer pos
            _blockSize=blockSize;
            _encryptBuffer=new byte[_blockSize];
            _encrPos=ENCRYPT_BLOCK;

            // Performs the equivalent of derive_key in Dr Brian Gladman's pwd2key.c
            var pdb=new Rfc2898DeriveBytes(key, saltBytes, KEY_ROUNDS);
            var rm=new RijndaelImplementation();
            rm.Mode=CipherMode.ECB; // No feedback from cipher for CTR mode
            _counterNonce=new byte[_blockSize];
            byte[] byteKey1=pdb.GetBytes(_blockSize);
            byte[] byteKey2=pdb.GetBytes(_blockSize);
            _encryptor=rm.CreateEncryptor(byteKey1, byteKey2);
            _pwdVerifier=pdb.GetBytes(PWD_VER_LENGTH);
            //
            
#if !OS_WINDOWS
           incrementalHash =  IncrementalHash.CreateHMAC(HashAlgorithmName.SHA1, byteKey2);
#else
            _hmacsha1=new HMACSHA1(byteKey2);
#endif
            _writeMode=writeMode;
        }