C#中对字符串的加密和解密

加密：

/// <summary>

        /// 对字符串进行加密

        /// </summary>

        /// <param name="proclaimText"></param>

        /// <returns></returns>

        public static string CipherText(string proclaimText)

        {

            if (proclaimText.IsEmpty()) return proclaimText;

            byte[] proclaimBytes = UnicodeEncoding.BigEndianUnicode.GetBytes(proclaimText);

            int proclaimBytesCount = proclaimBytes.Length;

            byte[] cipherBytes = new byte[proclaimBytesCount * 2];

            for (int i = 0; i < proclaimBytesCount; i += 2)

            {

                byte proclaimByte = proclaimBytes[i];

                int upperByte = proclaimByte & 0xf0;

                int lowerByte = proclaimByte & 0x0f;

                upperByte = upperByte >> 4;

                lowerByte = lowerByte << 4;

                byte proclaimByte2 = proclaimBytes[i + 1];

                int upperByte2 = proclaimByte2 & 0xf0;

                int lowerByte2 = proclaimByte2 & 0x0f;

                upperByte2 |= upperByte;

                lowerByte2 |= lowerByte;

                cipherBytes[i * 2] = 0x4e;

                cipherBytes[i * 2 + 1] = Convert.ToByte(upperByte2);

                cipherBytes[(i + 1) * 2] = 0x4f;

                cipherBytes[(i + 1) * 2 + 1] = Convert.ToByte(lowerByte2);

            }

            return UnicodeEncoding.BigEndianUnicode.GetString(cipherBytes, 0, cipherBytes.Length);

        }

解密：

/// <summary>

        /// 对字符串进行解密

        /// </summary>

        /// <param name="proclaimText"></param>

        /// <returns></returns>

        public static string DoProclaimText(string CipherText)

        {

            if (CipherText.IsEmpty()) return CipherText;

            byte[] cipherBytes = UnicodeEncoding.BigEndianUnicode.GetBytes(CipherText);

            int cipherBytesCount = cipherBytes.Length;

            byte[] proclaimBytes = new byte[cipherBytesCount / 2];

            for (int i = 0; i < cipherBytesCount; i += 4)

            {

                byte cipherByte1 = cipherBytes[i + 1];

                byte cipherByte2 = cipherBytes[i + 3];

                int lowerByte = (cipherByte1 & 0x0f) << 4;

                int upperByte = cipherByte1 & 0xf0;

                int lowerByte2 = cipherByte2 & 0x0f;

                int upperByte2 = (cipherByte2 & 0xf0) >> 4;

                proclaimBytes[i / 2] = Convert.ToByte(lowerByte | upperByte2);

                proclaimBytes[i / 2 + 1] = Convert.ToByte(upperByte | lowerByte2);

            }

            return UnicodeEncoding.BigEndianUnicode.GetString(proclaimBytes, 0, proclaimBytes.Length);

        }

巴特西

C#中对字符串的加密和解密

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