C# DES加密解密

/// <summary>
/// DES 加密
/// </summary>
/// <param name="pToEncrypt">需要加密的字符串</param>
/// <param name="sKey"></param>
/// <param name="sIV"></param>
/// <returns></returns>
public static string EncryptHttpString(string pToEncrypt, string sKey, string sIV)
{
//把字符串放到byte数组中
DESCryptoServiceProvider des = new DESCryptoServiceProvider();

byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
des.Key = Encoding.ASCII.GetBytes(sKey.Substring(0,8)); //建立加密对象的密钥和偏移量
des.IV = Encoding.ASCII.GetBytes(sIV.Substring(0, 8)); //原文使用ASCIIEncoding.ASCII方法的GetBytes方法
MemoryStream ms = new MemoryStream(); //使得输入密码必须输入英文文本
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();

return Convert.ToBase64String(ms.ToArray());
}
/// <summary>
/// DES 解密
/// </summary>
/// <param name="pToDecrypt">需要解密的字符串</param>
/// <param name="sKey"></param>
/// <param name="sIV"></param>
/// <returns></returns>
public static string DecryptHttpString(string pToDecrypt, string sKey, string sIV)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();

byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);
des.Key = Encoding.ASCII.GetBytes(sKey.Substring(0,8)); //建立加密对象的密钥和偏移量
des.IV = Encoding.ASCII.GetBytes(sIV.Substring(0, 8));
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);

cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
return System.Text.Encoding.Default.GetString(ms.ToArray());
}

JAVA  DES加密解密 DES/CBC/PKCS5Padding

public class DESUtil {

/**
* 偏移变量，固定占8位字节
*/
private final static String IV_PARAMETER = "12345678";
/**
* 密钥算法
*/
private static final String ALGORITHM = "DES";
/**
* 加密/解密算法-工作模式-填充模式
*/
private static final String CIPHER_ALGORITHM = "DES/CBC/PKCS5Padding";
/**
* 默认编码
*/
private static final String CHARSET = "utf-8";

/**
* 生成key
*
* @param password
* @return
* @throws Exception
*/
private static Key generateKey(String password) throws Exception {
DESKeySpec dks = new DESKeySpec(password.getBytes(CHARSET));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
return keyFactory.generateSecret(dks);
}

/**
* DES加密字符串
*
* @param password 加密密码，长度不能够小于8位
* @param data 待加密字符串
* @return 加密后内容
*/
public static String encrypt(String password, String data) {
if (password== null || password.length() < 8) {
throw new RuntimeException("加密失败，key不能小于8位");
}
if (data == null)
return null;
try {
Key secretKey = generateKey(password);
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
IvParameterSpec iv = new IvParameterSpec(IV_PARAMETER.getBytes(CHARSET));
cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
byte[] bytes = cipher.doFinal(data.getBytes(CHARSET));

//JDK1.8及以上可直接使用Base64，JDK1.7及以下可以使用BASE64Encoder
//Android平台可以使用android.util.Base64
return new String(Base64.getEncoder().encode(bytes));

} catch (Exception e) {
e.printStackTrace();
return data;
}
}

/**
* DES加密文件
*
* @param srcFile 待加密的文件
* @param destFile 加密后存放的文件路径
* @return 加密后的文件路径
*/
public static String encryptFile(String password, String srcFile, String destFile) {

if (password== null || password.length() < 8) {
throw new RuntimeException("加密失败，key不能小于8位");
}
try {
IvParameterSpec iv = new IvParameterSpec(IV_PARAMETER.getBytes(CHARSET));
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, generateKey(password), iv);
InputStream is = new FileInputStream(srcFile);
OutputStream out = new FileOutputStream(destFile);
CipherInputStream cis = new CipherInputStream(is, cipher);
byte[] buffer = new byte[1024];
int r;
while ((r = cis.read(buffer)) > 0) {
out.write(buffer, 0, r);
}
cis.close();
is.close();
out.close();
return destFile;
} catch (Exception ex) {
ex.printStackTrace();
}
return null;
}

}