[Java] plsql实现DES对称加密 Java解密

grant execute on dbms_crypto to xxx;

function encrypt_password(p_password in varchar2) return varchar2 is  
   v_key       varchar2(32) := 'TucM2fYDaxnd1UeRL7HVvyshXvXaMKO9';  
   v_encrypted_raw RAW(256);  
 begin  
   v_encrypted_raw := dbms_crypto.Encrypt(src => UTL_RAW.CAST_TO_RAW(p_password),  
                      typ => DBMS_CRYPTO.DES_CBC_PKCS5,  
                      iv=>UTL_RAW.CAST_TO_RAW('12345678'),  
                      key => UTL_RAW.CAST_TO_RAW(v_key));  
   return utl_raw.cast_to_varchar2(utl_encode.base64_encode(v_encrypted_raw));  
  end;

• v_key：密钥
  
• typ：加密算法，这里采用DES加密算法，可以使用密钥进行加密，使用相同的密钥进行解密，DES_CBC_PKCS5分为三段，DES表示加密算法是DES，CBC表示使用CBC模式进行加密，PKCS5表示分组的填充方式，大部分情况下，明文并非刚好64位的倍数。对于最后一个分组，如果长度小于64位，则需要用数据填充至64位。PKCS5Padding是常用的填充方式，如果没有指定，默认的方式就是它。
  
• iv：如果是采用CBC模式进行加密，需要指定始化向量IV
  

输入：zhengjianfeng  
输出：N8pbaNezTEJO34jIgJhUFg==

import javax.crypto.Cipher;  
import javax.crypto.SecretKeyFactory;  
import javax.crypto.spec.DESKeySpec;  
import javax.crypto.spec.IvParameterSpec;  
import java.security.Key;  
import java.util.Base64;  
/** 
 * @Description: 
 * @author: jianfeng.zheng 
 * @since: 2021/2/20 12:12 上午 
 * @history: 1.2021/2/20 created by jianfeng.zheng 
 */  
public class DesDecryptDemo {  
  private final static String IV_PARAMETER = "12345678";  
  private static final String ALGORITHM = "DES";  
  private static final String CIPHER_ALGORITHM = "DES/CBC/PKCS5Padding";  
  private static final String CHARSET = "utf-8";  
  private static final String KEY = "TucM2fYDaxnd1UeRL7HVvyshXvXaMKO9";  
  public static void main(String[] args) {  
    String encryptData = "N8pbaNezTEJO34jIgJhUFg==";  
    System.out.println("密文:" + encryptData);  
    String plainText = decrypt(KEY, encryptData);  
    System.out.println("明文:" + plainText);  
  }  
  public static String decrypt(String key, String data) {  
    if (key == null || key.length() < 8) {  
      throw new RuntimeException("加密失败，key不能小于8位");  
    }  
    if (data == null) {  
      return null;  
    }  
    try {  
      DESKeySpec dks = new DESKeySpec(key.getBytes(CHARSET));  
      SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);  
      Key secretKey = keyFactory.generateSecret(dks);  
      Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);  
      //设置始化向量  
      IvParameterSpec iv = new IvParameterSpec(IV_PARAMETER.getBytes(CHARSET));  
      cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);  
      return new String(cipher.doFinal(Base64.getDecoder().decode(data.getBytes(CHARSET))), CHARSET);  
    } catch (Exception e) {  
      e.printStackTrace();  
      return data;  
    }  
  }  
}

密文:N8pbaNezTEJO34jIgJhUFg==  
明文:zhengjianfeng