将.Net RSA xml密钥移植到Java

Question

我有来自.Net系统的私有和公共密钥,采用xml格式.我必须使用此密钥在Java中执行加密/解密.有什么办法吗？

公钥看起来像这样:

<RSAKeyValue>
    <Modulus>jHIxcGzzpByFv...pvhxFnP0ssmlBfMALis</Modulus>
    <Exponent>AQAB</Exponent>
</RSAKeyValue>

私钥:

<RSAKeyValue>
    <Modulus>4hjg1ibWXHIlH...ssmlBfMAListzrgk=</Modulus>
    <Exponent>AQAB</Exponent>
    <P>8QZCtrmJcr9uW7VRex+diH...jLHV5StmuBs1+vZZAQ==</P>
    <Q>8CUvJTv...yeDszMWNCQ==</Q>
    <DP>elh2Nv...cygE3657AQ==</DP>
    <DQ>MBUh5XC...+PfiMfX0EQ==</DQ>
    <InverseQ>oxvsj4WCbQ....LyjggXg==</InverseQ>
    <D>KrhmqzAVasx...uxQ5VGZmZ6yOAE=</D>
</RSAKeyValue>

我已经编写了一些代码来加密数据,但我不确定它是否正确.

        Element modulusElem = root.getChild("Modulus");
        Element exponentElem = root.getChild("Exponent");

        byte[] expBytes = decoder.decodeBuffer(exponentElem.getText().trim());
        byte[] modBytes = decoder.decodeBuffer(modulusElem.getText().trim());

        RSAPublicKeySpec keySpec = new RSAPublicKeySpec(new BigInteger(1, modBytes), new BigInteger(1, expBytes));
        KeyFactory fact = KeyFactory.getInstance("RSA");
        PublicKey pubKey = fact.generatePublic(keySpec);

如何从xml中创建私钥来解密数据？

Answer 1

那是decoder在你的例子做的Base64解码？看起来你可能依赖sun.misc.BASE64Decoder它,依赖那些内部类通常不是一个好主意(其他JVM不会拥有它).您可以使用具有Base64类的Apache Commons Codec进行解码.以下是RSA加密和解密所需的其余部分:

byte[] expBytes = Base64.decodeBase64(exponentElem.getText().trim()));
byte[] modBytes = Base64.decodeBase64(modulusElem.getText().trim());
byte[] dBytes = Base64.decodeBase64(dElem.getText().trim());

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

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

RSAPublicKeySpec pubSpec = new RSAPublicKeySpec(modules, exponent);
PublicKey pubKey = factory.generatePublic(pubSpec);
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
byte[] encrypted = cipher.doFinal(input.getBytes("UTF-8"));
System.out.println("encrypted: " + new String(encrypted));

RSAPrivateKeySpec privSpec = new RSAPrivateKeySpec(modules, d);
PrivateKey privKey = factory.generatePrivate(privSpec);
cipher.init(Cipher.DECRYPT_MODE, privKey);
byte[] decrypted = cipher.doFinal(encrypted);
System.out.println("decrypted: " + new String(decrypted));