/* 使用Des,MD5对字符串,数据文件加密.
//加密字符串,注意strEncrKey的长度为8位(如果要增加或者减少key长度,调整IV的长度就是了) public string DesEncrypt(string strText, string strEncrKey)
//解密字符串,注意strEncrKey的长度为8位(如果要增加或者减少key长度,调整IV的长度就是了)
public string DesDecrypt(string strText,string sDecrKey)
//加密数据文件,注意strEncrKey的长度为8位(如果要增加或者减少key长度,调整IV的长度就是了)
public void DesEncrypt(string m_InFilePath,string m_OutFilePath,string strEncrKey)
//解密数据文件,注意strEncrKey的长度为8位(如果要增加或者减少key长度,调整IV的长度就是了)
public void DesDecrypt(string m_InFilePath,string m_OutFilePath,string sDecrKey)
//MD5加密
public string MD5Encrypt(string strText)
*/
/****************************************************************************************** * Cryptography class is for Cryptography author:Jim e_mail:[email protected] * thanks: * URI: * * *****************************************************************************************/ using System; using System.Security.Cryptography; using System.Text; using System.IO; using System.Windows.Forms ;
namespace Netbee.Classes.Security { /// <summary> ///Cryptography /// </summary> public class Cryptography { public Cryptography() { } /// <summary> /// Encrypt the string /// Attention:key must be 8 bits /// </summary> /// <param name="strText">string</param> /// <param name="strEncrKey">key</param> /// <returns></returns> public string DesEncrypt(string strText, string strEncrKey) { byte[] byKey=null; byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF}; try { byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0,8)); DESCryptoServiceProvider des = new DESCryptoServiceProvider(); byte[] inputByteArray = Encoding.UTF8.GetBytes(strText); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write) ; cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); return Convert.ToBase64String(ms.ToArray());
} catch(System.Exception error) { MessageBox.Show(error.Message); return "error:" +error.Message+"\r"; } } /// <summary> /// Decrypt string /// Attention:key must be 8 bits /// </summary> /// <param name="strText">Decrypt string</param> /// <param name="sDecrKey">key</param> /// <returns>output string</returns> public string DesDecrypt(string strText,string sDecrKey) { byte[] byKey = null; byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF}; byte[] inputByteArray = new Byte[strText.Length]; try { byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0,8)); DESCryptoServiceProvider des = new DESCryptoServiceProvider(); inputByteArray = Convert.FromBase64String(strText); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); System.Text.Encoding encoding = new System.Text.UTF8Encoding(); return encoding.GetString(ms.ToArray()); } catch(System.Exception error) { MessageBox.Show(error.Message); return "error:"+error.Message+"\r"; } } /// <summary> /// Encrypt files /// Attention:key must be 8 bits /// </summary> /// <param name="m_InFilePath">Encrypt file path</param> /// <param name="m_OutFilePath">output file</param> /// <param name="strEncrKey">key</param> public void DesEncrypt(string m_InFilePath,string m_OutFilePath,string strEncrKey) { byte[] byKey=null; byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF}; try { byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0,8)); FileStream fin = new FileStream(m_InFilePath, FileMode.Open, FileAccess.Read); FileStream fout = new FileStream(m_OutFilePath, FileMode.OpenOrCreate, FileAccess.Write); fout.SetLength(0); //Create variables to help with read and write. byte[] bin = new byte[100]; //This is intermediate storage for the encryption. long rdlen = 0; //This is the total number of bytes written. long totlen = fin.Length; //This is the total length of the input file. int len; //This is the number of bytes to be written at a time.
DES des = new DESCryptoServiceProvider(); CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write); //Read from the input file, then encrypt and write to the output file. while(rdlen < totlen) { len = fin.Read(bin, 0, 100); encStream.Write(bin, 0, len); rdlen = rdlen + len; } encStream.Close(); fout.Close(); fin.Close();
} catch(System.Exception error) { MessageBox.Show(error.Message.ToString()); } } /// <summary> /// Decrypt files /// Attention:key must be 8 bits /// </summary> /// <param name="m_InFilePath">Decrypt filepath</param> /// <param name="m_OutFilePath">output filepath</param> /// <param name="sDecrKey">key</param> public void DesDecrypt(string m_InFilePath,string m_OutFilePath,string sDecrKey) { byte[] byKey = null; byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF}; try { byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0,8)); FileStream fin = new FileStream(m_InFilePath, FileMode.Open, FileAccess.Read); FileStream fout = new FileStream(m_OutFilePath, FileMode.OpenOrCreate, FileAccess.Write); fout.SetLength(0); //Create variables to help with read and write. byte[] bin = new byte[100]; //This is intermediate storage for the encryption. long rdlen = 0; //This is the total number of bytes written. long totlen = fin.Length; //This is the total length of the input file. int len; //This is the number of bytes to be written at a time.
DES des = new DESCryptoServiceProvider(); CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write); //Read from the input file, then encrypt and write to the output file. while(rdlen < totlen) { len = fin.Read(bin, 0, 100); encStream.Write(bin, 0, len); rdlen = rdlen + len; } encStream.Close(); fout.Close(); fin.Close();
} catch(System.Exception error) { MessageBox.Show( "error:"+error.Message); } } /// <summary> /// MD5 Encrypt /// </summary> /// <param name="strText">text</param> /// <returns>md5 Encrypt string</returns> public string MD5Encrypt(string strText) { MD5 md5 = new MD5CryptoServiceProvider(); byte[] result = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(strText)); return System.Text.Encoding.Default.GetString(result); } } }

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