计算X509证书的密钥标识

Question

我想计算X509证书的CERT_KEY_IDENTIFIER_PROP_ID，将其无提示地添加到Windows Mobile设备的注册表中（分段期间）。作为this site，计算公式如下：

SEQ[SEQ[rsa], key]

我猜key为cert.GetPublicKey()，但什么的意思与rsa这里（而不是算法我猜的）？

现在在网上搜索了三个小时，如果有人能指引我进入正确的方向，我将非常高兴。

Answer 1

读书，我需要写入注册表键的属性，我终于用下面的方法的CryptoAPI：

[DllImport("crypt32.dll", SetLastError = true)] 
private static extern IntPtr CertCreateCertificateContext(int dwCertEncodingType, byte[] pbCertEncoded, int cbCertEncoded); 

[DllImport("crypt32.dll", SetLastError = true)] 
private static extern bool CertFreeCertificateContext(IntPtr pCertContext); 

[DllImport("crypt32.dll", SetLastError = true)] 
private static extern bool CertGetCertificateContextProperty(IntPtr pCertContext, int dwPropId, IntPtr pvData, ref int pcbData); 

private byte[] GetKeyIdentifier(X509Certificate certificate) 
{ 
    var data = certificate.GetRawCertData(); 

    var context = CertCreateCertificateContext(1, data, data.Length); 

    try 
    { 
    return ReadProperty(context, 0x14); 
    } 
    finally 
    { 
    CertFreeCertificateContext(context); 
    } 
} 

private byte[] ReadProperty(IntPtr context, int property) 
{ 
    var length = 0; 

    // determine the ammount of memory to allocate for the data 
    if (CertGetCertificateContextProperty(context, property, IntPtr.Zero, ref length)) 
    { 
    var pointer = Marshal.AllocCoTaskMem(length); 

    try 
    { 
     // query the property which is written to the allocated memory 
     if (CertGetCertificateContextProperty(context, property, pointer, ref length) == false) 
     { 
     throw new InvalidOperationException(string.Format("Failed to query property {0}.", property)); 
     } 

     // extract the data from the unmanaged memory 
     var buffer = new byte[length]; 
     Marshal.Copy(pointer, buffer, 0, length); 

     return buffer; 
    } 
    finally 
    { 
     Marshal.FreeCoTaskMem(pointer); 
    } 
    } 
    else 
    { 
    throw new InvalidOperationException(string.Format("Failed to query property {0}.", property)); 
    } 
}