翻译C＃的RSACryptoServiceProvider到JAVA code [英] Translating C# RSACryptoServiceProvider into JAVA Code

问题描述

我得到由暴露出我打算消耗一些Web服务的Web服务队这样写C＃code。我的密码需要与此code进行加密，从而使Web服务知道如何解密在他们的结局。

I was given this C# code written by the web service team that exposes some web service that I'm planning to consume. My password needs to be encrypted with this code so that the web service knows how to decrypt it on their end.

using(RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
    rsa.FromXmlString(publicKey);
    byte[] plainBytes = Encoding.Unicode.GetBytes(clearText);
    byte[] encryptedBytes = rsa.Encrypt(plainBytes, false);
    return Convert.ToBase64String(encryptedBytes);
}

我使用Java来消费这个Web服务，现在，我有问题，把这一#C​​ code到Java code，因为Web服务无法正常解密密码。

I'm using Java to consume this web service and right now, I'm having problem translating that #C code into Java code because that web service can't decrypt my password properly.

下面是我目前的失败尝试： -

Here's my current failed attempt:-

// my clear text password
String clearTextPassword = "XXXXX";

// these values are provided by the web service team
String modulusString = "...";
String publicExponentString = "...";

BigInteger modulus = new BigInteger(1, Base64.decodeBase64(modulusString.getBytes("UTF-8")));
BigInteger publicExponent = new BigInteger(1, Base64.decodeBase64(publicExponentString.getBytes("UTF-8")));

KeyFactory keyFactory = KeyFactory.getInstance("RSA");

RSAPublicKeySpec publicKeySpec = new RSAPublicKeySpec(modulus, publicExponent);
PublicKey publicKey = keyFactory.generatePublic(publicKeySpec);

Cipher cipher = Cipher.getInstance("RSA/ECB/NoPadding");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);

String encodedEncryptedPassword = new String(Base64.encodeBase64(cipher.doFinal(clearTextPassword.getBytes("UTF-8"))));

我做了什么错？谢谢了。

What did I do wrong? Thanks much.

2013年8月7日 - 更新

我读<一个href=\"http://stephenhirst.word$p$pss.com/2011/09/18/load-rsa-keys-from-modulus-and-exponent-in-java/\"相对=nofollow>本网站，我意识到，我的模值和公共指数值不是十六进制。所以，我修改了code一点点，试图用 RSA / ECB / PKCS1PADDING 由@Dev提及。

I was reading this website and I realized that my modulus value and public exponent value are not in Hex. So, I modified my code a little bit and tried with RSA/ECB/PKCS1PADDING as mentioned by @Dev.

// my clear text password
String clearTextPassword = "XXXXX";

// these are the actual values I get from the web service team
String modulusString = "hm2oRCtP6usJKYpq7o1K20uUuL11j5xRrbV4FCQhn/JeXLT21laKK9901P69YUS3bLo64x8G1PkCfRtjbbZCIaa1Ci/BCQX8nF2kZVfrPyzcmeAkq4wsDthuZ+jPInknzUI3TQPAzdj6gim97E731i6WP0MHFqW6ODeQ6Dsp8pc=";
String publicExponentString = "AQAB";

Base64 base64Encoder = new Base64();

String modulusHex = new String(Hex.encodeHex(modulusString.getBytes("UTF-8")));
String publicExponentHex = new String(Hex.encodeHex(publicExponentString.getBytes("UTF-8")));

BigInteger modulus = new BigInteger(modulusHex, 16);
BigInteger publicExponent = new BigInteger(publicExponentHex);

KeyFactory keyFactory = KeyFactory.getInstance("RSA");

RSAPublicKeySpec publicKeySpec = new RSAPublicKeySpec(modulus, publicExponent);
PublicKey publicKey = keyFactory.generatePublic(publicKeySpec);

Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1PADDING");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);

String encodedEncryptedPassword = new String(base64Encoder.encode(cipher.doFinal(clearTextPassword.getBytes("UTF-8"))));

当我打的web服务，我得到这个错误：要解密的数据超出该系数的128字节的最大。这似乎是明文密码仍然不适当加密。

When I hit the webservice, I'm getting this error: "The data to be decrypted exceeds the maximum for this modulus of 128 bytes." It seems like the clear text password is still not encrypted properly.

任何帮助或建议是大大AP preciated。谢谢你。

Any help or suggestion is greatly appreciated. Thanks.

2013年8月9日 - SOLUTION

我下面贴我最后的工作解决方案。

I posted my final working solution below.

推荐答案

找到了解决办法。

String modulusString = "hm2oRCtP6usJKYpq7o1K20uUuL11j5xRrbV4FCQhn/JeXLT21laKK9901P69YUS3bLo64x8G1PkCfRtjbbZCIaa1Ci/BCQX8nF2kZVfrPyzcmeAkq4wsDthuZ+jPInknzUI3TQPAzdj6gim97E731i6WP0MHFqW6ODeQ6Dsp8pc=";
String publicExponentString = "AQAB";

byte[] modulusBytes = Base64.decodeBase64(modulusString);
byte[] exponentBytes = Base64.decodeBase64(publicExponentString);
BigInteger modulus = new BigInteger(1, modulusBytes);
BigInteger publicExponent = new BigInteger(1, exponentBytes);

RSAPublicKeySpec rsaPubKey = new RSAPublicKeySpec(modulus, publicExponent);
KeyFactory fact = KeyFactory.getInstance("RSA");
PublicKey pubKey = fact.generatePublic(rsaPubKey);
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1PADDING");
cipher.init(Cipher.ENCRYPT_MODE, pubKey);

byte[] plainBytes = clearTextPassword.getBytes("UTF-16LE");
byte[] cipherData = cipher.doFinal(plainBytes);
String encryptedStringBase64 = Base64.encodeBase64String(cipherData);

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