如何在java中加密和解密URl参数？

Question

如何在java中加密和解密URl参数而没有'/,&,=?'之类的html字符

import java.io.UnsupportedEncodingException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.KeySpec;

import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

public class DesEncrypter {

    Cipher ecipher;
    Cipher dcipher;

    byte[] salt =  {
            (byte)0xA9, (byte)0x9B, (byte)0xC8, (byte)0x32,
            (byte)0x56, (byte)0x35, (byte)0xE3, (byte)0x03
        };

    int iterationCount = 3;

    public DesEncrypter(String passPhrase) {

        try{

            KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount);
            SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(keySpec);

            ecipher = Cipher.getInstance(key.getAlgorithm());
            dcipher = Cipher.getInstance(key.getAlgorithm());

            AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);

            ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
            dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);

        } catch (java.security.InvalidAlgorithmParameterException e){
        } catch (java.security.spec.InvalidKeySpecException e){
        } catch (javax.crypto.NoSuchPaddingException e){
        } catch (java.security.NoSuchAlgorithmException e){
        } catch (java.security.InvalidKeyException e){
        }
    }

    public String encrypt(String str){

        try{

            byte[] utf8 = str.getBytes("UTF8");
            byte[] enc  = ecipher.doFinal(utf8);

            return new sun.misc.BASE64Encoder().encode(enc);

        } catch (javax.crypto.BadPaddingException e){
        } catch (IllegalBlockSizeException e){
        } catch (UnsupportedEncodingException e){
        }

        return null;
    }

    public String decrypt(String str){

        try{

            byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);
            byte[] utf8 = dcipher.doFinal(dec);

            return new String(utf8,"UTF8");

        } catch (javax.crypto.BadPaddingException e){
        } catch (IllegalBlockSizeException e){
        } catch (UnsupportedEncodingException e){
        } catch (java.io.IOException e){
        }

        return null;
    }

}

我的代码如上，我得到了加密结果：6puu4YjzScxHsv9tI/N92g==
在上面的输出中，由于反斜杠，我得到了我想要避免的错误。

Answer 1

代替

        byte[] utf8 = str.getBytes("UTF8");
        byte[] enc  = ecipher.doFinal(utf8);
        return new sun.misc.BASE64Encoder().encode(enc);

加密后使用Apache Commons URL Safe 64 bit encoder进行编码。

Base64.encodeBase64URLSafeString(enc);

解密前解码：

Base64.decodeBase64(dec)

请注意，这是 ENCODER 不是加密器。但字符串是 URL 安全的。

---

理想情况下，您应该始终使用 URL Encoder 对您的 URL 进行编码，这将确保对特殊字符进行编码。因此，即使您的 URL 包含受限制的字符，它也是安全的。