C#加密解密
标签：writer ctf tee toe net oar empty bytes linq
1、MD5加密
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
namespace MyEncrypt
{
///
/// 不可逆加密
/// 1 防止被篡改
/// 2 防止明文存储
/// 3 防止抵赖，数字签名
///
public class MD5Encrypt
{
#region MD5
///
/// MD5加密,和动网上的16/32位MD5加密结果相同,
/// 使用的UTF8编码
///
/// 待加密字串
/// 16或32值之一,其它则采用.net默认MD5加密算法
/// 加密后的字串
public static string Encrypt(string source, int length = 32)//默认参数
{
if (string.IsNullOrEmpty(source)) return string.Empty;
HashAlgorithm provider = CryptoConfig.CreateFromName("MD5") as HashAlgorithm;
byte[] bytes = Encoding.UTF8.GetBytes(source);//这里需要区别编码的
byte[] hashValue = provider.ComputeHash(bytes);
StringBuilder sb = new StringBuilder();
switch (length)
{
case 16://16位密文是32位密文的9到24位字符
for (int i = 4; i 12; i++)
{
sb.Append(hashValue[i].ToString("x2"));
}
break;
case 32:
for (int i = 0; i 16; i++)
{
sb.Append(hashValue[i].ToString("x2"));
}
break;
default:
for (int i = 0; i )
{
sb.Append(hashValue[i].ToString("x2"));
}
break;
}
return sb.ToString();
}
#endregion MD5
#region MD5摘要
///
/// 获取文件的MD5摘要
///
///
///
public static string AbstractFile(string fileName)
{
using (FileStream file = new FileStream(fileName, FileMode.Open))
{
return AbstractFile(file);
}
}
///
/// 根据stream获取文件摘要
///
///
///
public static string AbstractFile(Stream stream)
{
MD5 md5 = new MD5CryptoServiceProvider();
byte[] retVal = md5.ComputeHash(stream);
StringBuilder sb = new StringBuilder();
for (int i = 0; i )
{
sb.Append(retVal[i].ToString("x2"));
}
return sb.ToString();
}
#endregion
}
}
2、DES对称加密解密
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
namespace MyEncrypt
{
///
/// DES AES Blowfish
/// 对称加密算法的优点是速度快，
/// 缺点是密钥管理不方便，要求共享密钥。
/// 可逆对称加密 密钥长度8
///
public class DesEncrypt
{
private static byte[] _rgbKey = ASCIIEncoding.ASCII.GetBytes(Constant.DesKey.Substring(0, 8));
private static byte[] _rgbIV = ASCIIEncoding.ASCII.GetBytes(Constant.DesKey.Insert(0, "w").Substring(0, 8));
///
/// DES 加密
///
/// 需要加密的值
/// 加密后的结果
public static string Encrypt(string text)
{
DESCryptoServiceProvider dsp = new DESCryptoServiceProvider();
using (MemoryStream memStream = new MemoryStream())
{
CryptoStream crypStream = new CryptoStream(memStream, dsp.CreateEncryptor(_rgbKey, _rgbIV), CryptoStreamMode.Write);
StreamWriter sWriter = new StreamWriter(crypStream);
sWriter.Write(text);
sWriter.Flush();
crypStream.FlushFinalBlock();
memStream.Flush();
return Convert.ToBase64String(memStream.GetBuffer(), 0, (int)memStream.Length);
}
}
///
/// DES解密
///
///
/// 解密后的结果
public static string Decrypt(string encryptText)
{
DESCryptoServiceProvider dsp = new DESCryptoServiceProvider();
byte[] buffer = Convert.FromBase64String(encryptText);
using (MemoryStream memStream = new MemoryStream())
{
CryptoStream crypStream = new CryptoStream(memStream, dsp.CreateDecryptor(_rgbKey, _rgbIV), CryptoStreamMode.Write);
crypStream.Write(buffer, 0, buffer.Length);
crypStream.FlushFinalBlock();
return ASCIIEncoding.UTF8.GetString(memStream.ToArray());
}
}
}
}
3、RSA非对称加密解密
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Security;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
namespace MyEncrypt
{
///
/// RSA ECC
/// 可逆非对称加密
/// 非对称加密算法的优点是密钥管理很方便，缺点是速度慢。
///
public class RsaEncrypt
{
///
/// 获取加密/解密对
/// 给你一个，是无法推算出另外一个的
///
/// Encrypt Decrypt
///
/// Encrypt Decrypt
public static KeyValuePairstring, string> GetKeyPair()
{
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
string publicKey = RSA.ToXmlString(false);
string privateKey = RSA.ToXmlString(true);
return new KeyValuePairstring, string>(publicKey, privateKey);
}
///
/// 加密：内容+加密key
///
///
///
/// 加密key
///
public static string Encrypt(string content, string encryptKey)
{
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
rsa.FromXmlString(encryptKey);
UnicodeEncoding ByteConverter = new UnicodeEncoding();
byte[] DataToEncrypt = ByteConverter.GetBytes(content);
byte[] resultBytes = rsa.Encrypt(DataToEncrypt, false);
return Convert.ToBase64String(resultBytes);
}
///
/// 解密 内容+解密key
///
///
/// 解密key
///
public static string Decrypt(string content, string decryptKey)
{
byte[] dataToDecrypt = Convert.FromBase64String(content);
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
RSA.FromXmlString(decryptKey);
byte[] resultBytes = RSA.Decrypt(dataToDecrypt, false);
UnicodeEncoding ByteConverter = new UnicodeEncoding();
return ByteConverter.GetString(resultBytes);
}
///
/// 可以合并在一起的，每次产生一组新的密钥
///
///
/// 加密key
/// 解密key
/// 加密后结果
private static string Encrypt(string content, out string publicKey, out string privateKey)
{
RSACryptoServiceProvider rsaProvider = new RSACryptoServiceProvider();
publicKey = rsaProvider.ToXmlString(false);
privateKey = rsaProvider.ToXmlString(true);
UnicodeEncoding ByteConverter = new UnicodeEncoding();
byte[] DataToEncrypt = ByteConverter.GetBytes(content);
byte[] resultBytes = rsaProvider.Encrypt(DataToEncrypt, false);
return Convert.ToBase64String(resultBytes);
}
}
}
C#加密解密
标签：writer ctf tee toe net oar empty bytes linq
原文地址：https://www.cnblogs.com/sunff/p/13166937.html
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C#加密解密
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