Question

我们在尝试加密Android中的数据并在WCF服务中解密时遇到问题。用于加密数据的Android代码如下：

try{
String strModulus = "tr82UfeGetV7yBKcOPjFTWs7pHqqr/5YKKWMUZ/HG4HnCmWrZsOhuR1FBnMZ/g2YiosoSlu0zd7Ukz9lX7wv2RLfWXfMvZYGpAAvfYWwzbyQ2i1q+tKE/thgKNscoSRellDD+uJcYn1H4hnaudVyYJH9miVhOKhKlExMzw8an6U=";
String strExponent = "AQAB";
byte[] modulusBytes = Base64.decode(strModulus, Base64.DEFAULT);
byte[] exponentBytes = Base64.decode(strExponent, Base64.DEFAULT);

BigInteger modulus = new BigInteger(1, modulusBytes );               
BigInteger exponent = new BigInteger(1, exponentBytes);

RSAPublicKeySpec rsaPubKey = new RSAPublicKeySpec(modulus, exponent);
KeyFactory fact = KeyFactory.getInstance("RSA/ECB/PKCS1Padding");
PublicKey pubKey = fact.generatePublic(rsaPubKey);    

Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.ENCRYPT_MODE, pubKey);   

byte[] plainBytes = new String("Manchester United").getBytes("UTF-8");
byte[] cipherData = cipher.doFinal(plainBytes); 
encryptedString = Base64.encodeToString(cipherData, Base64.DEFAULT);
}
catch(Exception e){
Log.e("Error", e.toString());
}

return encryptedString;

Java中的相同代码：

try{
        String strModulus = "tr82UfeGetV7yBKcOPjFTWs7pHqqr/5YKKWMUZHG4HnCmWrZsOhuR1FBnMZ/g2YiosoSlu0zd7Ukz9lX7wv2RLfWXfMvZYGpAAvfYWwzbyQ2i1q+tKE/thgKNscoSRellDD+uJcYn1H4hnaudVyYJH9miVhOKhKlExMzw8an6U=";
        String strExponent = "AQAB";
        byte[] modulusBytes = DatatypeConverter.parseBase64Binary("tr82UfeGetV7yBKcOPjFTWs7pHqqr/5YKKWMUZ/HG4HnCmWrZsOhuR1FBnMZ/g2YiosoSlu0zd7Ukz9lX7wv2RLfWXfMvZYGpAAvfYWwzbyQ2i1q+tKE/thgKNscoSRellDD+uJcYn1H4hnaudVyYJH9miVhOKhKlExMzw8an6U=");
        byte[] exponentBytes = DatatypeConverter.parseBase64Binary("AQAB");

        BigInteger modulus = new BigInteger(1, modulusBytes );
        BigInteger exponent = new BigInteger(1, exponentBytes);

        RSAPublicKeySpec rsaPubKey = new RSAPublicKeySpec(modulus, exponent);
        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 = new String("Manchester United").getBytes("UTF-8");
        byte[] cipherData = cipher.doFinal(plainBytes);
        //String encryptedString = Base64.encodeToString(cipherData, Base64.NO_PADDING);
        String encryptedString = DatatypeConverter.printBase64Binary(cipherData);
        String encryptedData = encryptedString;
    }
    catch(Exception e){
    }       
}

WCF服务：

public string Decrypt()
{
    const int PROVIDER_RSA_FULL = 1;
    const string CONTAINER_NAME = "Tracker";
    CspParameters cspParams;
    cspParams = new CspParameters(PROVIDER_RSA_FULL);
    cspParams.KeyContainerName = CONTAINER_NAME;
    RSACryptoServiceProvider rsa1 = new RSACryptoServiceProvider(cspParams);
    rsa1.FromXmlString("<RSAKeyValue><Modulus>tr82UfeGetV7yBKcOPjFTWs7pHqqr/5YKKWMUZ/HG4HnCmWrZsOhuR1FBnMZ/g2YiosoSlu0zd7Ukz9lX7wv2RLfWXfMvZYGpAAvfYWwzbyQ2i1q+tKE/thgKNscoSRellDD+uJcYn1H4hnaudVyYJH9miVhOKhKlExMzw8an6U=</Modulus><Exponent>AQAB</Exponent><P>6e0nv7EBFBugtpoB+ozpg1J4js8E+DVyWCuBsERBPzqu4H7Z/oeLIRSC8Gi5GZgrCpBf3EvyIluM7rzaIfNThQ==</P><Q>x/29X9ns1WcXC42IJjLDjscz5ygdVh79dm8B2tQVbqwyhDsQ6OIOQdu5+eHf4hUMoTrM9KkS2F6FGlLXuaOFoQ==</Q><DP>kTS2LMaJ/dpce5zDx6w6s1q5HSSiWBSNIu/2s9zah448yXvUg6vNkD40PVk0NRAA/7C44H2AExWzOOqfmN17JQ==</DP><DQ>xtAx9drQPWnpl/uQUOEAVa0kpPTVDStrr9Q1FNTnpYkcAyYw7kLkB4anAIoSpk9kqdeprsNxz5VPXtbiTFMKYQ==</DQ><InverseQ>O0594NMjnjSp+/NAa1kQxoQNzn1qqq+p1Zb+kT3/jRc/0d7ZnqSSpxFMXfxx3yZkNAOPDOdbckPQbRZ13RKBHg==</InverseQ><D>bjVEagwvkrZaTt9CTW1hd3362weLFlX6DpE/3R3RcrpVfkSwKGpEhqGrNeeGPlsuqiaf5rAFir4eTqrF1QVliKsU4XE0RyzP5lHGc7dlX4DOHMjs2R9nNWv8QOTPoaRuLrLGorqBXlw/jQPxFI6gQzkIIjzuf//lDVnFam3dw4E=</D></RSAKeyValue>");
    string data2Decrypt = "LyVNDhkdJ5jNgwZDiVZ1R0lmd10AQgqNDFHh2vJB1676eg8wj0MOdTyChAGrvEjha0uXg+f/aNBAc4+/LFbCgsA1e+O3wnXr27sXznGJ9G15avZzQHG4JWUS42MXBahAkcJ80pcihTbL9edfQCkEuj9RzQ/zFJyDEMssfd/EPDM=";
    byte[] encyrptedBytes = Convert.FromBase64String(data2Decrypt);
    byte[] plain = rsa1.Decrypt(encyrptedBytes, false);
    string decryptedString = System.Text.Encoding.UTF8.GetString(plain);
}

原始数据：＆＃39;曼联＆＃39;

奇怪的是，如果我使用Java代码加密字符串，它可以在WCF服务端解密，但是，如果使用上面的Android代码加密，则解密会提供错误：＆＃34;要解密的数据超过了128字节的模数的最大值＆＃34;。

在调试时，我意识到Android和Java的byte[] cipherData不一样。以前的所有值都恰好是同步的。这会在Java和Android中生成不同的加密字符串。

我的问题是为什么会发生这种情况？有一个愚蠢的错误吗？有办法解决它吗？或者可以在Android中执行其他操作以获取“密码数据”。正确？

任何帮助将不胜感激。

Answer 1

您在Android上使用不同的填充。在Android上使用完全相同的填充：

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

使用RSA的Android中加密方法中的无效密码字节

1 个答案: