/// <summary> /// DES加密。 /// </summary> /// <param name="str">待加密的字符串</param> /// <param name="key">密钥,为8位字符串</param> /// <returns>返回加密后的字符串</returns> public static string DESEncrypt(string str, string key) { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); // 把字符串放到byte数组中 // 原来使用的UTF8编码,改成Unicode编码不行 byte[] inputByteArray = Encoding.Default.GetBytes(str); //byte[] inputByteArray = Encoding.Unicode.GetBytes(str); // 建立加密对象的密钥和偏移量 // 原文使用ASCIIEncoding.ASCII方法的GetBytes方法 // 使得输入密码必须输入英文文本 des.Key = ASCIIEncoding.ASCII.GetBytes(key); des.IV = ASCIIEncoding.ASCII.GetBytes(key); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write); // Write the byte array into the crypto stream // (It will end up in the memory stream) cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); // Get the data back from the memory stream, and into a string StringBuilder ret = new StringBuilder(); foreach (byte b in ms.ToArray()) { // Format as hex ret.AppendFormat("{0:X2}", b); } ret.ToString(); return ret.ToString(); } /// <summary> /// DES解密。 /// </summary> /// <param name="str">待解密的字符串</param> /// <param name="key">密钥,为8位字符串</param> /// <returns>返回解密后的字符串</returns> public static string DESDecrypt(string str, string key) { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); // Put the input string into the byte array byte[] inputByteArray = new byte[str.Length / 2]; for (int x = 0; x < str.Length / 2; x++) { int i = (Convert.ToInt32(str.Substring(x * 2, 2), 16)); inputByteArray[x] = (byte)i; } // 建立加密对象的密钥和偏移量,此值重要,不能修改 des.Key = ASCIIEncoding.ASCII.GetBytes(key); des.IV = ASCIIEncoding.ASCII.GetBytes(key); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write); // Flush the data through the crypto stream into the memory stream cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); // Get the decrypted data back from the memory stream // 建立StringBuild对象,CreateDecrypt使用的是流对象,必须把解密后的文本变成流对象 // StringBuilder ret = new StringBuilder(); return Encoding.Default.GetString(ms.ToArray()); }
private string HashString(string sInputString)
{
System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();
string encoded = BitConverter.ToString(md5.ComputeHash(Encoding.Default.GetBytes(sInputString))).Replace("-","");
return encoded;
}
/// DES加密。
/// </summary>
/// <param name="str">待加密的字符串</param>
/// <param name="key">密钥,为8位字符串</param>
/// <returns>返回加密后的字符串</returns>
public static string DESEncrypt(string str, string key)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
// 把字符串放到byte数组中
// 原来使用的UTF8编码,改成Unicode编码不行
byte[] inputByteArray = Encoding.Default.GetBytes(str);
//byte[] inputByteArray = Encoding.Unicode.GetBytes(str); // 建立加密对象的密钥和偏移量
// 原文使用ASCIIEncoding.ASCII方法的GetBytes方法
// 使得输入密码必须输入英文文本
des.Key = ASCIIEncoding.ASCII.GetBytes(key);
des.IV = ASCIIEncoding.ASCII.GetBytes(key);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
// Write the byte array into the crypto stream
// (It will end up in the memory stream)
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
// Get the data back from the memory stream, and into a string
StringBuilder ret = new StringBuilder();
foreach (byte b in ms.ToArray())
{
// Format as hex
ret.AppendFormat("{0:X2}", b);
}
ret.ToString();
return ret.ToString();
} /// <summary>
/// DES解密。
/// </summary>
/// <param name="str">待解密的字符串</param>
/// <param name="key">密钥,为8位字符串</param>
/// <returns>返回解密后的字符串</returns>
public static string DESDecrypt(string str, string key)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider(); // Put the input string into the byte array
byte[] inputByteArray = new byte[str.Length / 2];
for (int x = 0; x < str.Length / 2; x++)
{
int i = (Convert.ToInt32(str.Substring(x * 2, 2), 16));
inputByteArray[x] = (byte)i;
} // 建立加密对象的密钥和偏移量,此值重要,不能修改
des.Key = ASCIIEncoding.ASCII.GetBytes(key);
des.IV = ASCIIEncoding.ASCII.GetBytes(key);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
// Flush the data through the crypto stream into the memory stream
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock(); // Get the decrypted data back from the memory stream
// 建立StringBuild对象,CreateDecrypt使用的是流对象,必须把解密后的文本变成流对象
// StringBuilder ret = new StringBuilder(); return Encoding.Default.GetString(ms.ToArray());
}