CryptExportKey在C＃ [英] CryptExportKey in C#

问题描述

什么是C＃相当于此 CryptExportKey call？

  CryptExportKey（hKey，hPublicKey，SIMPLEBLOB，0，lpData，& nSize）; 
  

这将是很好，如果你可以给你的C＃代码的描述

hKey，hPublicKey和SIMPLEBLOB（或其在C＃中的等效项）正在使用

解决方案

我认为最好的选择是手动处理。

SIMPLEBLOB格式为

  BLOBHEADER blobheader; 
 ALG_ID algid; 
 BYTE encryptedkey [rsapubkey.bitlen / 8]; 
  

其中BLOBHEADER

  BYTE bType; 
 BYTE bVersion; 
 WORD reserved; 
 ALG_ID aiKeyAlg; 
  

所以这样的东西应该可以做（对不起，没有测试）：

public byte [] CryptExportKey（SymmetricAlgorithm key，RSA publicKey）{
using（MemoryStream ms = new MemoryStream（））
using BinaryWriter w = new BinaryWriter（w））{
w.Write（（byte）0x01）; // SIMPLEBLOB
w.Write（（byte）0x02）; // Version 2
w.Write（（byte）0x00）; // Reserved
w.Write（（byte）0x00）; //保留
if（key是Rijndael）{
w.Write（0x00006611）; //加密密钥的ALG_ID。
} else if（key is TripleDES&&& key.KeySizeValue == 192）{
w.Write（0x00006603）; //加密密钥的ALG_ID。
} else {
throw new NotSupportedException（在http://msdn.microsoft.com/en-us/library/aa375549%28VS.85%29.aspx上查看值）;
}
w.Write（0x0000a400）; // CALG_RSA_KEYX
byte [] encryptedKey = publicKey.Encrypt（key.Key）;
byte [] reversedEncryptedKey = new byte [encryptedKey.Length];
for（int i = 0; i reversedEncryptedKey [i] = encryptedKey [encryptedKey.Length_1-i];
}
w.Write（reversedEncryptedKey）; //以LSB字节顺序加密的密钥
w.Flush（）;
return ms.ToArray（）;
}
}


What is the C# equivalent to this CryptExportKey call?

CryptExportKey(hKey, hPublicKey, SIMPLEBLOB, 0, lpData, &nSize);

and it would be nice if you can give a description on your C# code where

hKey, hPublicKey and SIMPLEBLOB (or their equivalent in C#) are being used

解决方案

I think your best bet is handling it manually.

The SIMPLEBLOB format is

BLOBHEADER blobheader;
ALG_ID algid;
BYTE encryptedkey[rsapubkey.bitlen/8];

where BLOBHEADER is

BYTE   bType;
BYTE   bVersion;
WORD   reserved;
ALG_ID aiKeyAlg;

so something like this should do it (sorry, not tested):

public byte[] CryptExportKey(SymmetricAlgorithm key, RSA publicKey){
  using(MemoryStream ms = new MemoryStream())
  using(BinaryWriter w = new BinaryWriter(w)){
    w.Write((byte) 0x01); // SIMPLEBLOB
    w.Write((byte) 0x02); // Version 2
    w.Write((byte) 0x00); // Reserved
    w.Write((byte) 0x00); // Reserved
    if(key is Rijndael){
      w.Write(0x00006611);  // ALG_ID for the encrypted key.
    }else if (key is TripleDES && key.KeySizeValue == 192){
      w.Write(0x00006603);  // ALG_ID for the encrypted key.
    }else{
      throw new NotSupportedException("Look the value up on http://msdn.microsoft.com/en-us/library/aa375549%28VS.85%29.aspx");
    }
    w.Write(0x0000a400);  // CALG_RSA_KEYX
    byte[] encryptedKey = publicKey.Encrypt(key.Key);
    byte[] reversedEncryptedKey = new byte[encryptedKey.Length];
    for(int i=0;i<encryptedKey.Length;i++){
      reversedEncryptedKey[i] = encryptedKey[encryptedKey.Length - 1 - i];
    }
    w.Write(reversedEncryptedKey); // encrypted key in LSB byte order
    w.Flush();
    return ms.ToArray();
  }
}

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