将字节数组转换为X.509证书 [英] Converting a byte array to a X.509 certificate

问题描述

我试图将一段Java代码移植到.NET中，它需要一个Base64编码字符串，将其转换为字节数组，然后使用它来生成X.509证书，以获取模数&

$ b 这是我要转换的Java代码：

  byte [] externalPublicKey = Base64.decode（base 64 encoded string）; 
 KeyFactory keyFactory = KeyFactory.getInstance（RSA）; 
 EncodedKeySpec publicKeySpec = new X509EncodedKeySpec（externalPublicKey）; 
 key publicKey = keyFactory.generatePublic（publicKeySpec）; 
 RSAPublicKey pbrtk =（java.security.interfaces.RSAPublicKey）publicKey; 
 BigInteger modulus = pbrtk.getModulus（）; 
 BigInteger pubExp = pbrtk.getPublicExponent（）; 
  

我一直在想办法把这个转换成.NET的最好方法。到目前为止，我想出了这个：

  byte [] bytes = Convert.FromBase64String（base 64 encoded string ）; 
 X509Certificate2 x509 = new X509Certificate2（bytes）; 
 RSA rsa =（RSA）x509.PrivateKey; 
 RSAParameters rsaParams = rsa.ExportParameters（false）; 
 byte [] modulus = rsaParams.Modulus; 
 byte [] exponent = rsaParams.Exponent;对我来说这看起来像应该工作，但它抛出一个 < /msdn.microsoft.com/en-us/library/system.security.cryptography.cryptographicexception.aspxrel =nofollow noreferrer> CryptographicException 当我使用base64编码字符串从Java代码生成X509证书。我收到的确切讯息是：
 
 
找不到要求的物件。
 
 
 Java的X.509实现只是与.NET不兼容，或者我在从Java到.NET的转换中做错了吗？ 
 
 
 
或者在这种情况下，从Java到.NET没有转换？
解决方案
 
您的base64编码资料似乎不是X.509凭证：
 
 
 [ X509EncodedKeySpec class ]表示ASN.1编码
 
 
导出Java中的整个X.509证书，或尝试在中找到等效的X509EncodedKeySpec类。 .NET框架。
 
I'm trying to port a piece of Java code into .NET that takes a Base64 encoded string, converts it to a byte array, and then uses it to make a X.509 certificate to get the modulus & exponent for RSA encryption.

This is the Java code I'm trying to convert:
byte[] externalPublicKey = Base64.decode("base 64 encoded string");
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(externalPublicKey);
Key publicKey = keyFactory.generatePublic(publicKeySpec);
RSAPublicKey pbrtk = (java.security.interfaces.RSAPublicKey) publicKey;
BigInteger modulus = pbrtk.getModulus();
BigInteger pubExp = pbrtk.getPublicExponent();
I've been trying to figure out the best way to convert this into .NET. So far, I've come up with this:
byte[] bytes = Convert.FromBase64String("base 64 encoded string");
X509Certificate2 x509 = new X509Certificate2(bytes);
RSA rsa = (RSA)x509.PrivateKey;
RSAParameters rsaParams = rsa.ExportParameters(false);
byte[] modulus = rsaParams.Modulus;
byte[] exponent = rsaParams.Exponent;
Which to me looks like it should work, but it throws a CryptographicException when I use the base 64 encoded string from the Java code to generate the X509 certificate. The exact message I receive is:

  
Cannot find the requested object.
Is Java's X.509 implementation just incompatible with .NET's, or am I doing something wrong in my conversion from Java to .NET? 

Or is there simply no conversion from Java to .NET in this case?
解决方案
It seems your base64-encoded data does not represent an X.509 certificate:

  
[The X509EncodedKeySpec class] represents the ASN.1 encoding of a public key
Export the whole X.509 certificate in Java, or try to find an equivalent of the X509EncodedKeySpec class in the .NET framework.

                        
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