CryptExportKey在C#
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22-08-2019 - |
题
什么是C#相当于此 CryptExportKey 一>呼叫?
CryptExportKey(hKey, hPublicKey, SIMPLEBLOB, 0, lpData, &nSize);
和这将是很好,如果你可以在你的C#代码给予说明,其中
的hKey,hPublicKey和正在使用SIMPLEBLOB(或它们的等效于C#)
解决方案
我认为最好的方法是手工处理它。
在SIMPLEBLOB格式是
BLOBHEADER blobheader;
ALG_ID algid;
BYTE encryptedkey[rsapubkey.bitlen/8];
其中BLOBHEADER是
BYTE bType;
BYTE bVersion;
WORD reserved;
ALG_ID aiKeyAlg;
所以像这样应该这样做(对不起,未测试):
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); // 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();
}
}
其他提示
这是我用什么?
using System.Security.Cryptography;
using System.Security.Cryptography.Xml;
// retrieve from named keystore
private void btnRetrieve_Click(object sender, RoutedEventArgs e)
{
string keyContainer = this.tbContainerName.Text;
CspParameters parms = new CspParameters(1);
parms.Flags = CspProviderFlags.UseMachineKeyStore;
parms.KeyContainerName = keyContainer;
parms.KeyNumber = 2;
RSACryptoServiceProvider RsaCsp = new RSACryptoServiceProvider(parms);
tbPubKeyBlob.Text = RsaCsp.ToXmlString(false);
}
// generate key pair
private void btnCreateKeypair_Click(object sender, RoutedEventArgs e)
{
int keySize = 0;
if (!System.Int32.TryParse(this.tbKeySize.Text, out keySize))
keySize = 1024;
byte[] key = Keys.GenerateKeyPair(keySize);
RSACryptoServiceProvider RsaCsp = new RSACryptoServiceProvider();
RsaCsp.ImportCspBlob(key);
tbPubKeyBlob.Text = RsaCsp.ToXmlString(false);
}
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