数据加密解密方法-优快云博客

Encrypt
  1using System;
  2using System.Security.Cryptography;
  3using System.IO;
  4using System.Text;
  5
  6/**//// <summary>
  7/// Help to process 数据加密、解密，文件的加密解密
  8/// </summary>
  9/// <created>By Peter Lee @ 2006-03-22</created>
10/// <modified>By Peter Lee @ 2006-04-15</modified>
11public sealed class Encrypt
12{
13    private Encrypt()
14    { }
15    /**//// <summary>
16    /// 只能是长度为8的ASCII码
17    /// </summary>
18    private const string DESKEY = "Ha1d4yOu";
19    /**//// <summary>
20    /// 使用DES加密算法加密，并返回加密过程成功与否。
21    /// </summary>
22    /// <param name="strText">明文</param>
23    /// <param name="sOutText">当加密成功时输出密文</param>
24    /// <returns></returns>
25    public static bool DesEncrypt(string strText, out string sOutText)
26    {
27        string strEncrKey = Encrypt.DESKEY;
28        sOutText = string.Empty;
29        byte[] byKey = null;
30        byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
31        try
32        {
33            byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0, strEncrKey.Length));
34            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
35            byte[] inputByteArray = Encoding.UTF8.GetBytes(strText);
36            MemoryStream ms = new MemoryStream();
37            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);
38            cs.Write(inputByteArray, 0, inputByteArray.Length);
39            cs.FlushFinalBlock();
40            sOutText = Convert.ToBase64String(ms.ToArray());
41            return true;
42        }
43        catch
44        {
45            sOutText = string.Empty;
46            return false;
47        }
48    }
49    /**//// <summary>
50    /// 使用DES算法解密，并返回解密成功与否。
51    /// </summary>
52    /// <param name="strText">要解密的密文。</param>
53    /// <param name="sOutText">当解密成功时输出明文</param>
54    /// <returns></returns>
55    public static bool DesDecrypt(string strText, out string sOutText)
56    {
57        string sDecrKey = Encrypt.DESKEY;
58        sOutText = string.Empty;
59        byte[] byKey = null;
60        byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
61        byte[] inputByteArray = new Byte[strText.Length];
62        try
63        {
64            byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));
65            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
66            inputByteArray = Convert.FromBase64String(strText);
67            MemoryStream ms = new MemoryStream();
68            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);
69            cs.Write(inputByteArray, 0, inputByteArray.Length);
70            cs.FlushFinalBlock();
71            System.Text.Encoding encoding = new System.Text.UTF8Encoding();
72            sOutText = encoding.GetString(ms.ToArray());
73            return true;
74        }
75        catch
76        {
77            sOutText = string.Empty;
78            return false;
79        }
80
81    }
82    /**//// <summary>
83    /// 使用DES加密算法加密文件。
84    /// </summary>
85    /// <param name="m_InFilePath">要加密的文件所在路径。</param>
86    /// <param name="m_OutFilePath">加密后输出文件所在路径，有同名文件存在时会先删除。</param>
87    /// <returns></returns>
88    public static bool DesEncrypt(string m_InFilePath, string m_OutFilePath)
89    {
90        -= OLD =-
123
124        if(!System.IO.File.Exists( m_InFilePath ))
125        {
126            return false;
127        }
128        string strText = FileIO.ReadTextFile( m_InFilePath );
129        if(null == strText)
130        {
131            return false;
132        }
133        string sOutText;
134        if(!Encrypt.DesEncrypt(strText,out sOutText))
135        {
136            return false;
137        }
138        return FileIO.WriteToFile( m_OutFilePath,sOutText);
139    }
140    /**//// <summary>
141    /// 使用DES算法解密被加密的文件。
142    /// </summary>
143    /// <param name="m_InFilePath">要解密的文件所在路径。</param>
144    /// <param name="m_OutFilePath">解密后输出文件路径，有同名文件存在时会先删除。</param>
145    /// <returns></returns>
146    public static bool DesDecrypt(string m_InFilePath, string m_OutFilePath)
147    {
148        -= OLD =-
184
185        if(!System.IO.File.Exists(m_InFilePath))
186        {
187            return false;
188        }
189        string strText = FileIO.ReadTextFile( m_InFilePath );
190        if(null == strText)
191        {
192            return false;
193        }
194        string sOutText;
195        if(!Encrypt.DesDecrypt(strText,out sOutText))
196        {
197            return false;
198        }
199        return FileIO.WriteToFile(m_OutFilePath,sOutText);
200    }
201    /**//// <summary>
202    /// 使用MD5加密指定的明文并返回加密结果。
203    /// </summary>
204    /// <param name="strText">要加密的字符串</param>
205    /// <returns></returns>
206    public static string MD5Encrypt(string strText)
207    {
208        MD5 md5 = new MD5CryptoServiceProvider();
209        byte[] result = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(strText));
210        return System.Text.Encoding.Default.GetString(result);
211    }
212    /**//// <summary>
213    /// 使用MD5解密指定的密文并返回解密结果。
214    /// </summary>
215    /// <param name="strText"></param>
216    /// <returns></returns>
217    public static string MD5Decrypt(string strText)
218    {
219        MD5 md5 = new MD5CryptoServiceProvider();
220        byte[] result = md5.TransformFinalBlock(System.Text.Encoding.Default.GetBytes(strText), 0, strText.Length);
221        return System.Text.Encoding.Default.GetString(result);
222    }
223}

简单的加密与解密示例