问题

以下是翻译好的部分：

当使用 jsencrypt.min.js 进行加密，然后使用 Java 进行解密时抛出异常。

strp1：

后端私钥如下：

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

后端公钥如下：

MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCbICWBOsidubfDZOmudI7gHMBw3YQS3NS5t6/bxWGUqkqyShbNCEqHRJ2JC8JKEvBq58L155l54H2wR383lrdBcJY6WYrgBP0DNhahdate9XRCf2ThPnqXpepQl7G3/St5POZz49bv4uiB4IoSQBP3hOebpuVMFRuF23q08GZIIQIDAQAB

step2：
我使用 vue.js 导入 jsencrypt.min.js 进行加密的代码如下：

VxxRfQ5QciBbmDHUFHk/tJEdZP7ypweW4fLiw7/nXrdFIrykj1+0Dcr6Uk6tskLoM2z7eyyAfXYygjiZiGzkazs2uJ3udZjlWaG2VBR9+yW7V5qJg0GEP1ir5BBIxBZrTTVIyruFeMuBnFWqjApin+eJWRGZ1EF+ZNgOh0/uM8xTIE7gg6ypmjdu0W1sHEgdcPcZrB7m7zoRi7Qgpj3b1tVafeE4FOS7ySDqr2HWByL1hSmqQGN3e8W/Fn0dnTSkByXnAqSkRN/peTphPkrzXGUBbNWHQT+WU701Y52hoqIUO+IHOHk+UZlDpAQSEHs6rHPXXnPOui66eghI3j9C0A==

step3：
使用 Java 进行解密的代码，然后抛出异常：

Exception in thread "main" javax.crypto.BadPaddingException: Decryption error
	at sun.security.rsa.RSAPadding.unpadV15(RSAPadding.java:383)
	at sun.security.rsa.RSAPadding.unpad(RSAPadding.java:294)
	at com.sun.crypto.provider.RSACipher.doFinal(RSACipher.java:363)
	at com.sun.crypto.provider.RSACipher.engineDoFinal(RSACipher.java:389)
	at javax.crypto.Cipher.doFinal(Cipher.java:2222)
	at com.javaweb.util.core.RsaUtil.decrypt(RsaUtil.java:197)
	at com.javaweb.util.core.RsaUtil.main(RsaUtil.java:218)

我的 Java 解密代码如下：

public static String decrypt(String data, PrivateKey privateKey) throws Exception {
    Cipher cipher = Cipher.getInstance("RSA"); // RSA/ECB/NoPadding//RSA/ECB/PKCS1Padding
    cipher.init(Cipher.DECRYPT_MODE, privateKey);
    byte[] dataBytes = Base64.decodeBase64(data);
    int inputLen = dataBytes.length;
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    int offset = 0;
    byte[] cache;
    int i = 0;
    while (inputLen - offset > 0) {
        if (inputLen - offset > MAX_DECRYPT_BLOCK) {
            cache = cipher.doFinal(dataBytes, offset, MAX_DECRYPT_BLOCK);
        } else {
            cache = cipher.doFinal(dataBytes, offset, inputLen - offset);
        }
        out.write(cache, 0, cache.length);
        i++;
        offset = i * MAX_DECRYPT_BLOCK;
    }
    byte[] decryptedData = out.toByteArray();
    out.close();
    return new String(decryptedData, "UTF-8");
}
MAX_DECRYPT_BLOCK = 128

我发现 step2 中的代码转换为字节数组的长度为 256，但如果解密这段代码：

f/ghwhailFH1G

<details>
<summary>英文:</summary>

when use jsencrypt.min.js encrypt and java decrypt throws exception

strp1:

backend private_key is:

    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

backend public_key is:

    MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCbICWBOsidubfDZOmudI7gHMBw3YQS3NS5t6/bxWGUqkqyShbNCEqHRJ2JC8JKEvBq58L155l54H2wR383lrdBcJY6WYrgBP0DNhahdate9XRCf2ThPnqXpepQl7G3/St5POZz49bv4uiB4IoSQBP3hOebpuVMFRuF23q08GZIIQIDAQAB

step2:
I use vue.js import jsencrypt.min.js encrypt code,the code is:

    VxxRfQ5QciBbmDHUFHk/tJEdZP7ypweW4fLiw7/nXrdFIrykj1+0Dcr6Uk6tskLoM2z7eyyAfXYygjiZiGzkazs2uJ3udZjlWaG2VBR9+yW7V5qJg0GEP1ir5BBIxBZrTTVIyruFeMuBnFWqjApin+eJWRGZ1EF+ZNgOh0/uM8xTIE7gg6ypmjdu0W1sHEgdcPcZrB7m7zoRi7Qgpj3b1tVafeE4FOS7ySDqr2HWByL1hSmqQGN3e8W/Fn0dnTSkByXnAqSkRN/peTphPkrzXGUBbNWHQT+WU701Y52hoqIUO+IHOHk+UZlDpAQSEHs6rHPXXnPOui66eghI3j9C0A==

step3:
use java decrypt that code,then throws Excetpion

    Exception in thread &quot;main&quot; javax.crypto.BadPaddingException: Decryption error
	at sun.security.rsa.RSAPadding.unpadV15(RSAPadding.java:383)
	at sun.security.rsa.RSAPadding.unpad(RSAPadding.java:294)
	at com.sun.crypto.provider.RSACipher.doFinal(RSACipher.java:363)
	at com.sun.crypto.provider.RSACipher.engineDoFinal(RSACipher.java:389)
	at javax.crypto.Cipher.doFinal(Cipher.java:2222)
	at com.javaweb.util.core.RsaUtil.decrypt(RsaUtil.java:197)
	at com.javaweb.util.core.RsaUtil.main(RsaUtil.java:218)
my java decrypt code is

     public static String decrypt(String data, PrivateKey privateKey) throws Exception {
    	Cipher cipher = Cipher.getInstance(&quot;RSA&quot;);//RSA/ECB/NoPadding//RSA/ECB/PKCS1Padding
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        byte[] dataBytes = Base64.decodeBase64(data);
        int inputLen = dataBytes.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offset = 0;
        byte[] cache;
        int i = 0;
        while (inputLen - offset &gt; 0) {
        	if (inputLen - offset &gt; MAX_DECRYPT_BLOCK) {
        		cache = cipher.doFinal(dataBytes, offset, MAX_DECRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(dataBytes, offset, inputLen - offset);
            }
            out.write(cache, 0, cache.length);
            i++;
            offset = i * MAX_DECRYPT_BLOCK;
         }
         byte[] decryptedData = out.toByteArray();
         out.close();
         return new String(decryptedData,&quot;UTF-8&quot;);
    }
MAX_DECRYPT_BLOCK = 128

I found `step2 code` to bytes array length is 256,but if decrypt this code  

    f/ghwhailFH1GUbvvm2FpvaZttChJgsSorUx8Wy83PaC2ZorfMdu3Lz5Px56GLbX5VbKtdRTdRuC+yCGK8RZICUxJpTdblN8yoKUI2LdxPFnc7IHlRWN60xkww1bQ3c9QyT5IKYe7TKOx7SGmUXIi0ec/QMEklEYUUG8YrmJ7Xo=

i can got right result,then I change MAX_DECRYPT_BLOCK = 256,but still no use
then i see someone say &quot;jsencrypt use pkcs1 rule,java use pkcs8 rule&quot;,I tried Cipher.getInstance(&quot;RSA/ECB/PKCS1Padding&quot;) but still no use.

Do you have any idea to solve this problem


</details>