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C#教程之C#教程之字符串加密
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试听地址 https://www.xin3721.com/eschool/CSharpxin3721/
试听地址 https://www.xin3721.com/eschool/CSharpxin3721/
====对称加密(向量)=====
//SymmetricAlgorithm 所有对称算法的实现都必须从中继承的抽象基类
private SymmetricAlgorithm mobjCryptoService;
private string key;
public Encrypt()
{
mobjCryptoService = new RijndaelManaged();
key = "Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";//自定义的密串
}
/// <summary>
/// 获得密钥
/// </summary>
/// <returns>密钥</returns>
private byte[] GetLegalKey()
{
string sTemp = key;
mobjCryptoService.GenerateKey();// 当在派生类中重写时，生成用于该算法的随机密钥
byte[] bytTemp = mobjCryptoService.Key;
int KeyLength = bytTemp.Length;
if (sTemp.Length > KeyLength)
sTemp = sTemp.Substring(0, KeyLength);
else if (sTemp.Length < KeyLength)
sTemp = sTemp.PadRight(KeyLength, ' ');
return ASCIIEncoding.ASCII.GetBytes(sTemp);
}
/// <summary>
/// 获得初始向量IV
/// </summary>
/// <returns>初试向量IV</returns>
private byte[] GetLegalIV()
{
string sTemp = "E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk";
mobjCryptoService.GenerateIV();
byte[] bytTemp = mobjCryptoService.IV;// 获取或设置对称算法的初始化向量
int IVLength = bytTemp.Length;//获得一个 32 位整数，表示 System.Array 的所有维数中元素的总数
if (sTemp.Length > IVLength)
sTemp = sTemp.Substring(0, IVLength);
else if (sTemp.Length < IVLength)
sTemp = sTemp.PadRight(IVLength, ' ');
return ASCIIEncoding.ASCII.GetBytes(sTemp);
}
/// <summary>
/// 加密方法(请先实例化Encrypt类)
/// </summary>
/// <param name="Source">待加密的串</param>
/// <returns>经过加密的串</returns>
public string EncrypStrByIV(string Source)
{
byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);
MemoryStream ms = new MemoryStream();
mobjCryptoService.Key = GetLegalKey();
mobjCryptoService.IV = GetLegalIV();
ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();
CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
cs.Write(bytIn, 0, bytIn.Length);
cs.FlushFinalBlock();
ms.Close();
byte[] bytOut = ms.ToArray();
return Convert.ToBase64String(bytOut);
}
/// <summary>
/// 解密方法(请先实例化Encrypt类)
/// </summary>
/// <param name="Source">待解密的串</param>
/// <returns>经过解密的串</returns>
public string DecrypStrByIV(string Source)
{
byte[] bytIn = Convert.FromBase64String(Source);
MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);
mobjCryptoService.Key = GetLegalKey();
mobjCryptoService.IV = GetLegalIV();
ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();
CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
StreamReader sr = new StreamReader(cs);
return sr.ReadToEnd();
}
========DES加密========
/// <summary>
/// DES加密
/// </summary>
/// <param name="Text">待加密的字符串</param>
/// <returns>加密后的字符串</returns>
public static string DESEncrypt(string Text)
{
return DESEncrypt(Text, "ijnskijnse");
}
/// <summary>
/// DES加密数据
/// </summary>
/// <param name="Text">待加密的字符串</param>
/// <param name="sKey">加密密钥</param>
/// <returns>加密后的字符串</returns>
public static string DESEncrypt(string Text, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray;
inputByteArray = Encoding.Default.GetBytes(Text);
des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
System.IO.MemoryStream ms = new System.IO.MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
foreach (byte b in ms.ToArray())
{
ret.AppendFormat("{0:X2}", b);
}
return ret.ToString();
}
/// <summary>
/// DES解密
/// </summary>
/// <param name="Text">待解密的字符串</param>
/// <returns>解密后的明文</returns>
public static string DESDecrypt(string Text)
{
return DESDecrypt(Text, "ijnskijnse");
}
/// <summary>
/// DES解密数据
/// </summary>
/// <param name="Text">待解密的字符串</param>
/// <param name="sKey">解密密钥</param>
/// <returns>解密后的明文</returns>
public static string DESDecrypt(string Text, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
int len;
len = Text.Length / 2;
byte[] inputByteArray = new byte[len];
int x, i;
for (x = 0; x < len; x++)
{
i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
inputByteArray[x] = (byte)i;
}
des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
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());
}
====倒序加1加密解密====
/// <summary> /// 倒序加1加密 /// </summary> /// <param name="rs"></param> /// <returns></returns> public static string EncryptOrderStr(string rs) //倒序加1加密 { byte[] by = new byte[rs.Length]; for (int i = 0; i <= rs.Length - 1; i++) { by[i] = (byte)((byte)rs[i] + 1); } rs = ""; for (int i = by.Length - 1; i >= 0; i--) { rs += ((char)by[i]).ToString(); } return rs; } /// <summary> /// 顺序减1解码 /// </summary> /// <param name="rs"></param> /// <returns></returns> public static string DecryptOrderStr(string rs) //顺序减1解码 { byte[] by = new byte[rs.Length]; for (int i = 0; i <= rs.Length - 1; i++) { by[i] = (byte)((byte)rs[i] - 1); } rs = ""; for (int i = by.Length - 1; i >= 0; i--) { rs += ((char)by[i]).ToString(); } return rs; }
======Base64编解码=====
/// <summary>
/// Base64编码
/// </summary>
/// <param name="code_type">编码类型</param>
/// <param name="code">待编码的字符串</param>
/// <returns></returns>
public static string Base64Encode(string code_type, string code)
{
string encode = "";
byte[] bytes = Encoding.GetEncoding(code_type).GetBytes(code);
try
{
encode = Convert.ToBase64String(bytes);
}
catch
{
encode = code;
}
return encode;
}
/// <summary>
/// Base64解码
/// </summary>
/// <param name="code_type">编码类型</param>
/// <param name="code">带解码的字符串</param>
/// <returns></returns>
public static string Base64Decode(string code_type, string code)
{
string decode = "";
byte[] bytes = Convert.FromBase64String(code);
try
{
decode = Encoding.GetEncoding(code_type).GetString(bytes);
}
catch
{
decode = code;
}
return decode;
}
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