Java 用XML私钥解密RSA

我从m团队获得了一个xml格式的私钥。我想解密他们发送给我的消息（应用程序内）

XML:

我决定只取代码中的模块和D，因为我已经读过了，它足够解码了 当我运行这段代码时，我有一个错误：java.lang.ArrayIndexOutOfBoundsException:RSA块的数据太多

怎么了

static String decrypt(String s) throws Exception
{
    String modulus =  "0xp1ux1gDERsUyGUpl+UZB/MK2TgZCDENQaM2cDsqiluTnW9jtTScLTrgyBhsCNVjDB7ZnJnWpMMdfFeJkxWSFEjFoKlJAqzs9VmHheLql+hUZavxY3q2x9whXc/IpXIvGXlWYzaLAuHEwbpSY8C0b93elkw1zN4GI3h19Yj+1WVgfPvpmweADocllZEIi26oBHNlcDlBGM/PE+YgownWbBCtr8kzaiZz9TUHjnbNEr8BkK/dKkv9BICBTF98A6c7gf/kiI0mqLAm5l3Eq8PL26kmjju5Bsa5ja4WywTT7CgFHBzlU/OzbHsiQYSKPVrFw7YyXfyZHy4qvtDXA7afQ==";
    String dD =  "hYkHUAWU7C2cGDn1vghX5b33eLum9a+EbcZm8peHHVx32knATslxFLpc/+VL5g9z3eoNJRDZMAI0r6au16sSKUyp1WNu8w2R/v/OSNq8DlnPwbyAE4diOJn6o3J7DXWSNRp/qdXfbF0eZHrKty0vq15iRZKFwptcLKwTYGSk/iZO951XuI1/hHr45fIxhz6QPBSMF5iWYShhI4zESYqjseytpzlk83npMnI4qghLVk6aQIls5AjWaD8oei4wNJ1S30U3rfQ2mnZrhbMi25G2be9nK/Gt+7/OKPNDsqh00VmKVn4v97Uy8cHZ4+zCQ5C5WtCtamhqmPrbeh7F8LzQQQ==";

    byte[] modBytes = decodeBase64(modulus.trim());
    byte[] dBytes = decodeBase64(dD);

    BigInteger modules = new BigInteger(1, modBytes);
    BigInteger d = new BigInteger(1, dBytes);

    KeyFactory factory = KeyFactory.getInstance("RSA");
    Cipher cipher = Cipher.getInstance("RSA");

    RSAPrivateKeySpec privSpec = new RSAPrivateKeySpec(modules, d);
    PrivateKey privKey = factory.generatePrivate(privSpec);
    cipher.init(Cipher.DECRYPT_MODE, privKey);
    byte[] decrypted = cipher.doFinal(s.getBytes());      
    return new String(decrypted);
}

方法将base64转换为字节

 private static byte[] decodeBase64(String dataToDecode)
{
    byte[] dataDecoded = Base64.decode(dataToDecode, Base64.DEFAULT);
    return dataDecoded;
}

更新1:错误列表

字节[]decrypted=cipher.doFinal（s.getBytes（））上发生错误

最终版本

private String byte[] decodeBase64(String dataToDecode)
{
    byte[] dataDecoded = Base64.decode(dataToDecode, Base64.DEFAULT);
    return dataDecoded;
}
public static void decrypt(String s) throws Exception
{

    String modulus = "your modulus here";
    String dD = "your D here"; 

    byte[] modBytes = decodeBase64(modulus.trim());
    byte[] dBytes = decodeBase64(dD.trim());

    BigInteger modules = new BigInteger(1, modBytes);
    BigInteger d = new BigInteger(1, dBytes);

    KeyFactory factory = KeyFactory.getInstance("RSA");
    Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");

    RSAPrivateKeySpec privSpec = new RSAPrivateKeySpec(modules, d);
    PrivateKey privKey = factory.generatePrivate(privSpec);
    cipher.init(Cipher.DECRYPT_MODE, privKey);
    byte[] decrypted = cipher.doFinal(decodeBase64(s));
    return new String(decrypted);
}

---

Post完整堆栈跟踪和taht行导致异常是数据解密编码在base 64中？密文的大小是多少？（RSA受密钥长度限制）。您正在使用pkcs1p添加吗？尝试

Cipher.getInstance（“RSA/ECB/PKCS1Padding”）@pedrofb已添加。当然，base64我在C#上有“相同”的代码，它与base64一起工作，然后从base64解码。Change
byte[]decrypted=cipher.doFinal（decodeBase64（s.getBytes（））
@pedrofb much thx too u））
byte[]decrypted=cipher.doFinal（decodeBase64（s））工作正常
private String byte[] decodeBase64(String dataToDecode)
{
    byte[] dataDecoded = Base64.decode(dataToDecode, Base64.DEFAULT);
    return dataDecoded;
}
public static void decrypt(String s) throws Exception
{

    String modulus = "your modulus here";
    String dD = "your D here"; 

    byte[] modBytes = decodeBase64(modulus.trim());
    byte[] dBytes = decodeBase64(dD.trim());

    BigInteger modules = new BigInteger(1, modBytes);
    BigInteger d = new BigInteger(1, dBytes);

    KeyFactory factory = KeyFactory.getInstance("RSA");
    Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");

    RSAPrivateKeySpec privSpec = new RSAPrivateKeySpec(modules, d);
    PrivateKey privKey = factory.generatePrivate(privSpec);
    cipher.init(Cipher.DECRYPT_MODE, privKey);
    byte[] decrypted = cipher.doFinal(decodeBase64(s));
    return new String(decrypted);
}