用.NET自带的DES加解密程序,可是发现在解密时,如果密码错误时会有异常(“不正确的数据”)产生,这是为什么呢。
照我的理解,DES是对称加密。如果密码错误,应返回乱码才对(假设加密对象为字符串)。附源码,网上搜索出来的,全是一个模样。using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;namespace Common {
///
/// 加密和解密
///
public sealed class EncryptDecrypt {
private EncryptDecrypt(){} //默认密钥向量
private static byte[] Keys = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF}; ///
/// 利用MD5对字符串进行加密
///
/// 待加密的字符串
/// 返回加密后的字符串
public static string EncryptMD5(string encryptString) {
MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();
UTF8Encoding Encode = new UTF8Encoding();
byte[] HashedBytes = md5Hasher.ComputeHash(Encode.GetBytes(encryptString));
return Encode.GetString(HashedBytes);
} ///
/// DES加密字符串
///
/// 待加密的字符串
/// 加密密钥,要求为8位
/// 加密成功返回加密后的字符串,失败返回源串
public static string EncryptDES(string encryptString,string encryptKey) {
try {
byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0,8));
byte[] rgbIV = Keys;
byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream,dCSP.CreateEncryptor(rgbKey,rgbIV),CryptoStreamMode.Write);
cStream.Write(inputByteArray,0,inputByteArray.Length);
cStream.FlushFinalBlock();
return Convert.ToBase64String(mStream.ToArray());
}
catch {
return encryptString;
}
} ///
/// DES解密字符串
///
/// 待解密的字符串
/// 解密密钥,要求为8位,和加密密钥相同
/// 解密成功返回解密后的字符串,失败返源串
public static string DecryptDES(string decryptString,string decryptKey) {
try {
byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
byte[] rgbIV = Keys;
byte[] inputByteArray = Convert.FromBase64String(decryptString);
DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream,DCSP.CreateDecryptor(rgbKey,rgbIV),CryptoStreamMode.Write);
cStream.Write(inputByteArray,0,inputByteArray.Length);
cStream.FlushFinalBlock();
return Encoding.UTF8.GetString(mStream.ToArray());
}
catch {
return decryptString;
}
}
}}
照我的理解,DES是对称加密。如果密码错误,应返回乱码才对(假设加密对象为字符串)。附源码,网上搜索出来的,全是一个模样。using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;namespace Common {
///
/// 加密和解密
///
public sealed class EncryptDecrypt {
private EncryptDecrypt(){} //默认密钥向量
private static byte[] Keys = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF}; ///
/// 利用MD5对字符串进行加密
///
/// 待加密的字符串
/// 返回加密后的字符串
public static string EncryptMD5(string encryptString) {
MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();
UTF8Encoding Encode = new UTF8Encoding();
byte[] HashedBytes = md5Hasher.ComputeHash(Encode.GetBytes(encryptString));
return Encode.GetString(HashedBytes);
} ///
/// DES加密字符串
///
/// 待加密的字符串
/// 加密密钥,要求为8位
/// 加密成功返回加密后的字符串,失败返回源串
public static string EncryptDES(string encryptString,string encryptKey) {
try {
byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0,8));
byte[] rgbIV = Keys;
byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream,dCSP.CreateEncryptor(rgbKey,rgbIV),CryptoStreamMode.Write);
cStream.Write(inputByteArray,0,inputByteArray.Length);
cStream.FlushFinalBlock();
return Convert.ToBase64String(mStream.ToArray());
}
catch {
return encryptString;
}
} ///
/// DES解密字符串
///
/// 待解密的字符串
/// 解密密钥,要求为8位,和加密密钥相同
/// 解密成功返回解密后的字符串,失败返源串
public static string DecryptDES(string decryptString,string decryptKey) {
try {
byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
byte[] rgbIV = Keys;
byte[] inputByteArray = Convert.FromBase64String(decryptString);
DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream,DCSP.CreateDecryptor(rgbKey,rgbIV),CryptoStreamMode.Write);
cStream.Write(inputByteArray,0,inputByteArray.Length);
cStream.FlushFinalBlock();
return Encoding.UTF8.GetString(mStream.ToArray());
}
catch {
return decryptString;
}
}
}}
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