DotNet中几种常用的加密算法

在.NET项目中，我们较多的使用到加密这个操作。因为在现代的项目中，对信息安全的要求越来越高，那么多信息的加密就变得至关重要。现在提供几种常用的加密/解密算法。

1.用于文本和Base64编码文本的互相转换 和 Byte[]和Base64编码文本的互相转换：

(1).将普通文本转换成Base64编码的文本

       /// 
        /// 将普通文本转换成Base64编码的文本        /// 
        /// 普通文本        ///         public static string StringToBase64String(string value)        {            if (string.IsNullOrEmpty(value))            {                throw new ArgumentNullException(value);            }            try            {                var binBuffer = (new UnicodeEncoding()).GetBytes(value);                var base64ArraySize = (int)Math.Ceiling(binBuffer.Length / 3d) * 4;                var charBuffer = new char[base64ArraySize];                Convert.ToBase64CharArray(binBuffer, 0, binBuffer.Length, charBuffer, 0);                var s = new string(charBuffer);                return s;            }            catch (Exception ex)            {                throw new Exception(ex.Message);            }        }

(2).将Base64编码的文本转换成普通文本

        /// 
        /// 将Base64编码的文本转换成普通文本        /// 
        /// Base64编码的文本        ///         public static string Base64StringToString(string base64)        {            if (string.IsNullOrEmpty(base64))            {                throw new ArgumentNullException(base64);            }            try            {                var charBuffer = base64.ToCharArray();                var bytes = Convert.FromBase64CharArray(charBuffer, 0, charBuffer.Length);                return (new UnicodeEncoding()).GetString(bytes);            }            catch (Exception ex)            {                throw new Exception(ex.Message);            }        }

(3).将Byte[]转换成Base64编码文本

        /// 
        /// 将Byte[]转换成Base64编码文本        /// 
        /// Byte[]        ///         public string ToBase64(byte[] binBuffer)        {            if (binBuffer == null)            {                throw new ArgumentNullException("binBuffer");            }            try            {                var base64ArraySize = (int)Math.Ceiling(binBuffer.Length / 3d) * 4;                var charBuffer = new char[base64ArraySize];                Convert.ToBase64CharArray(binBuffer, 0, binBuffer.Length, charBuffer, 0);                var s = new string(charBuffer);                return s;            }            catch (Exception ex)            {                throw new Exception(ex.Message);            }        }

(4).将Base64编码文本转换成Byte[]

       /// 
        /// 将Base64编码文本转换成Byte[]        /// 
        /// Base64编码文本        ///         public byte[] Base64ToBytes(string base64)        {            if (string.IsNullOrEmpty(base64))            {                throw new ArgumentNullException(base64);            }            try            {                var charBuffer = base64.ToCharArray();                var bytes = Convert.FromBase64CharArray(charBuffer, 0, charBuffer.Length);                return bytes;            }            catch (Exception ex)            {                throw new Exception(ex.Message);            }        }

2. DES加密/解密类。

(1).加密

  private static readonly string KEY = "pengze0902";        /// 
        /// 加密        /// 
        ///         ///         public static string Encrypt(string Text)        {            return Encrypt(Text, KEY);        }        /// 
         /// 加密数据         /// 
         ///          ///          ///          public static string Encrypt(string Text, string sKey)        {            var des = new DESCryptoServiceProvider();            var inputByteArray = Encoding.Default.GetBytes(Text);            var bKey = Encoding.ASCII.GetBytes(Md5Hash(sKey).Substring(0, 8));            des.Key = bKey;            des.IV = bKey;            var ms = new System.IO.MemoryStream();            var cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);            cs.Write(inputByteArray, 0, inputByteArray.Length);            cs.FlushFinalBlock();            var ret = new StringBuilder();            foreach (byte b in ms.ToArray())            {                ret.AppendFormat("{0:X2}", b);            }            return ret.ToString();        }

(2).解密

   private static readonly string KEY = "pengze0902";        /// 
        /// 解密        /// 
        ///         ///         public static string Decrypt(string text)        {            return Decrypt(text, KEY);        }        /// 
         /// 解密数据         /// 
         ///          ///          ///          public static string Decrypt(string text, string sKey)        {            var des = new DESCryptoServiceProvider();            var len = text.Length / 2;            byte[] inputByteArray = new byte[len];            int x;            for (x = 0; x < len; x++)            {                var i = Convert.ToInt32(text.Substring(x * 2, 2), 16);                inputByteArray[x] = (byte)i;            }            var bKey = Encoding.ASCII.GetBytes(Md5Hash(sKey).Substring(0, 8));            des.Key = bKey;            des.IV = bKey;            System.IO.MemoryStream ms = new System.IO.MemoryStream();            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);            cs.Write(inputByteArray, 0, inputByteArray.Length);            cs.FlushFinalBlock();            return Encoding.Default.GetString(ms.ToArray());        }

(3).取得MD5加密串新航道培训

        //// 
        /// 取得MD5加密串        /// 
        /// 源明文字符串        /// 密文字符串        public static string Md5Hash(string input)        {            var md5 = new MD5CryptoServiceProvider();            var bs = Encoding.UTF8.GetBytes(input);            bs = md5.ComputeHash(bs);            var s = new StringBuilder();            foreach (var b in bs)            {                s.Append(b.ToString("x2").ToUpper());            }            var password = s.ToString();            return password;        }

3.MD5加密

(1). 32位大写

        /// 
        /// 32位大写        /// 
        ///         public static string Upper32(string s)        {            var hashPasswordForStoringInConfigFile = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(s, "md5");            if (hashPasswordForStoringInConfigFile != null)                s = hashPasswordForStoringInConfigFile.ToString();            return s.ToUpper();        }

(2). 32位小写

        /// 
        /// 32位小写        /// 
        ///         public static string Lower32(string s)        {            var hashPasswordForStoringInConfigFile = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(s, "md5");            if (hashPasswordForStoringInConfigFile != null)                s = hashPasswordForStoringInConfigFile.ToString();            return s.ToLower();        }

(3).16位大写

        /// 
        /// 16位大写        /// 
        ///         public static string Upper16(string s)        {            var hashPasswordForStoringInConfigFile = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(s, "md5");            if (hashPasswordForStoringInConfigFile != null)                s = hashPasswordForStoringInConfigFile.ToString();            return s.ToUpper().Substring(8, 16);        }

(4).16位小写

        /// 
        /// 16位小写        /// 
        ///         public static string Lower16(string s)        {            var hashPasswordForStoringInConfigFile = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(s, "md5");            if (hashPasswordForStoringInConfigFile != null)                s = hashPasswordForStoringInConfigFile.ToString();            return s.ToLower().Substring(8, 16);        }

4.Sha1签名算法

        /// 
        /// 签名算法        /// 
        ///         ///         public static string GetSha1(string str)        {            if (string.IsNullOrEmpty(str))            {                throw new ArgumentNullException(str);            }            try            {                //建立SHA1对象                SHA1 sha = new SHA1CryptoServiceProvider();                //将mystr转换成byte[]                 var enc = new ASCIIEncoding();                var dataToHash = enc.GetBytes(str);                //Hash运算                var dataHashed = sha.ComputeHash(dataToHash);                //将运算结果转换成string                var hash = BitConverter.ToString(dataHashed).Replace("-", "");                return hash;            }            catch (Exception ex)            {                throw new Exception(ex.Message);            }        }

5.Sha256加密算法

       /// 
        /// 将字符串转换为sha256散列        /// 
        /// 字符串进行转换        /// sha256散列或null        public static string ToSha256(this string data)        {            try            {                if (string.IsNullOrEmpty(data))                    return null;                var hashValue = new SHA256Managed().ComputeHash(Encoding.UTF8.GetBytes(data));                var hex = hashValue.Aggregate("", (current, x) => current + String.Format("{0:x2}", x));                if (string.IsNullOrEmpty(hex))                    throw new Exception("Erro creating SHA256 hash");                return hex;            }            catch (Exception e)            {                throw new Exception(e.Message, e);            }        }

以上是一些较为常用的算法代码。