public static extern bool CryptRetrieveTimeStamp(
[MarshalAs(UnmanagedType.LPWStr)] string wszUrl,
uint dwRetrievalFlags,
uint dwTimeout,
[MarshalAs(UnmanagedType.LPStr)] string pszHashId,
ref CRYPT_TIMESTAMP_PARA pPara,
byte[] pbData,
uint cbData,
out IntPtr ppTsContext,
IntPtr ppTsSigner,
IntPtr phStore);
internal static SignedCms RequestTimestamp(byte[] data, string hashAlgorithmOid, Uri timestampingAuthorityUrl)
{
var para = new CRYPT_TIMESTAMP_PARA()
{
fRequestCerts = true
};
IntPtr unmanagedContext = IntPtr.Zero;
byte[] encodedResponse;
try
{
NativeUtils.ThrowIfFailed(NativeMethods.CryptRetrieveTimeStamp(
wszUrl: timestampingAuthorityUrl.ToString(),
dwRetrievalFlags: NativeMethods.TIMESTAMP_VERIFY_CONTEXT_SIGNATURE,
dwTimeout: 5 * 1000 /* 5 second timeout */,
pszHashId: hashAlgorithmOid,
pPara: ref para,
pbData: data,
cbData: (uint)data.Length,
ppTsContext: out unmanagedContext,
ppTsSigner: IntPtr.Zero,
phStore: IntPtr.Zero));
// Copy the encoded response out
var context = (CRYPT_TIMESTAMP_CONTEXT)Marshal.PtrToStructure(unmanagedContext, typeof(CRYPT_TIMESTAMP_CONTEXT));
encodedResponse = new byte[context.cbEncoded];
Marshal.Copy(context.pbEncoded, encodedResponse, 0, (int)context.cbEncoded);
}
finally
{
if (unmanagedContext != IntPtr.Zero)
{
NativeMethods.CryptMemFree(unmanagedContext);
}
}
SignedCms cms = new SignedCms();
cms.Decode(encodedResponse);
return(cms);
}
internal static SignedCms RequestTimestamp(byte[] data, string hashAlgorithmOid, Uri timestampingAuthorityUrl)
{
var para = new CRYPT_TIMESTAMP_PARA()
{
fRequestCerts = true
};
IntPtr unmanagedContext = IntPtr.Zero;
byte[] encodedResponse;
try
{
NativeUtils.ThrowIfFailed(NativeMethods.CryptRetrieveTimeStamp(
wszUrl: timestampingAuthorityUrl.ToString(),
dwRetrievalFlags: NativeMethods.TIMESTAMP_VERIFY_CONTEXT_SIGNATURE,
dwTimeout: 5 * 1000 /* 5 second timeout */,
pszHashId: hashAlgorithmOid,
pPara: ref para,
pbData: data,
cbData: (uint)data.Length,
ppTsContext: out unmanagedContext,
ppTsSigner: IntPtr.Zero,
phStore: IntPtr.Zero));
// Copy the encoded response out
var context = (CRYPT_TIMESTAMP_CONTEXT)Marshal.PtrToStructure(unmanagedContext, typeof(CRYPT_TIMESTAMP_CONTEXT));
encodedResponse = new byte[context.cbEncoded];
Marshal.Copy(context.pbEncoded, encodedResponse, 0, (int)context.cbEncoded);
}
finally
{
if (unmanagedContext != IntPtr.Zero)
{
NativeMethods.CryptMemFree(unmanagedContext);
}
}
SignedCms cms = new SignedCms();
cms.Decode(encodedResponse);
return cms;
}
public static extern bool CryptRetrieveTimeStamp(
[MarshalAs(UnmanagedType.LPWStr)] string wszUrl,
uint dwRetrievalFlags,
uint dwTimeout,
[MarshalAs(UnmanagedType.LPStr)] string pszHashId,
ref CRYPT_TIMESTAMP_PARA pPara,
byte[] pbData,
uint cbData,
out IntPtr ppTsContext,
IntPtr ppTsSigner,
IntPtr phStore);
