private byte[] GetByteArrayAttribute(CMSG_GETPARAM_TYPE param, uint index)
{
// Get the length of the attribute
uint valueLength = 0;
NativeUtils.ThrowIfFailed(NativeMethods.CryptMsgGetParam(
_handle,
param,
index,
null,
ref valueLength));
// Now allocate some memory for it
byte[] data = new byte[(int)valueLength];
// Get the actual digest
NativeUtils.ThrowIfFailed(NativeMethods.CryptMsgGetParam(
_handle,
param,
index,
data,
ref valueLength));
return(data);
}
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 void AddCertificates(IEnumerable <byte[]> encodedCertificates)
{
foreach (var cert in encodedCertificates)
{
// Construct the blob
IntPtr unmanagedCert = IntPtr.Zero;
IntPtr unmanagedBlob = IntPtr.Zero;
try
{
// Build blob holder
unmanagedCert = Marshal.AllocHGlobal(cert.Length);
Marshal.Copy(cert, 0, unmanagedCert, cert.Length);
var blob = new CRYPT_INTEGER_BLOB_INTPTR()
{
cbData = (uint)cert.Length,
pbData = unmanagedCert
};
// Copy it to unmanaged memory
unmanagedBlob = Marshal.AllocHGlobal(Marshal.SizeOf(blob));
Marshal.StructureToPtr(blob, unmanagedBlob, fDeleteOld: false);
// Invoke the request
if (!NativeMethods.CryptMsgControl(
_handle,
dwFlags: 0,
dwCtrlType: CMSG_CONTROL_TYPE.CMSG_CTRL_ADD_CERT,
pvCtrlPara: unmanagedBlob))
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
}
finally
{
NativeUtils.SafeFree(unmanagedCert);
NativeUtils.SafeFree(unmanagedBlob);
}
}
}
internal static TimeStampToken VerifyTimestamp(byte[] data, SignedCms timestampCms)
{
var signer = Signer.FromSignerInfo(timestampCms.SignerInfos[0]);
bool trusted = signer.SignerCertificate.Verify();
var contentInfo = timestampCms.Encode();
IntPtr unmanagedContext = IntPtr.Zero;
try
{
NativeUtils.ThrowIfFailed(NativeMethods.CryptVerifyTimeStampSignature(
pbTSContentInfo: contentInfo,
cbTSContentInfo: (uint)contentInfo.Length,
pbData: data,
cbData: (uint)data.Length,
hAdditionalStore: IntPtr.Zero,
ppTsContext: out unmanagedContext,
ppTsSigner: IntPtr.Zero,
phStore: IntPtr.Zero));
// Copy the context out
var context = (CRYPT_TIMESTAMP_CONTEXT)Marshal.PtrToStructure(unmanagedContext, typeof(CRYPT_TIMESTAMP_CONTEXT));
// Copy the info out
var info = (CRYPT_TIMESTAMP_INFO)Marshal.PtrToStructure(context.pTimeStamp, typeof(CRYPT_TIMESTAMP_INFO));
return(TimeStampToken.FromTimestampInfo(info, signer, trusted));
}
finally
{
if (unmanagedContext != IntPtr.Zero)
{
NativeMethods.CryptMemFree(unmanagedContext);
}
}
}
public void AddTimestamp(byte[] timeStampCms)
{
IntPtr unmanagedTimestamp = IntPtr.Zero;
IntPtr unmanagedBlob = IntPtr.Zero;
IntPtr unmanagedAttr = IntPtr.Zero;
IntPtr unmanagedEncoded = IntPtr.Zero;
IntPtr unmanagedAddAttr = IntPtr.Zero;
try
{
// Wrap the timestamp in a CRYPT_INTEGER_BLOB and copy that to unmanaged memory
unmanagedTimestamp = Marshal.AllocHGlobal(timeStampCms.Length);
Marshal.Copy(timeStampCms, 0, unmanagedTimestamp, timeStampCms.Length);
var blob = new CRYPT_INTEGER_BLOB_INTPTR()
{
cbData = (uint)timeStampCms.Length,
pbData = unmanagedTimestamp
};
unmanagedBlob = Marshal.AllocHGlobal(Marshal.SizeOf(blob));
Marshal.StructureToPtr(blob, unmanagedBlob, fDeleteOld: false);
// Wrap it in a CRYPT_ATTRIBUTE and copy that too!
var attr = new CRYPT_ATTRIBUTE()
{
pszObjId = Constants.SignatureTimeStampTokenAttributeOid.Value,
cValue = 1,
rgValue = unmanagedBlob
};
unmanagedAttr = Marshal.AllocHGlobal(Marshal.SizeOf(attr));
Marshal.StructureToPtr(attr, unmanagedAttr, fDeleteOld: false);
// Now encode the object using ye olde double-call-to-find-out-the-length mechanism :)
uint encodedLength = 0;
if (!NativeMethods.CryptEncodeObjectEx(
dwCertEncodingType: NativeMethods.X509_ASN_ENCODING | NativeMethods.PKCS_7_ASN_ENCODING,
lpszStructType: new IntPtr(NativeMethods.PKCS_ATTRIBUTE),
pvStructInfo: unmanagedAttr,
dwFlags: 0,
pEncodePara: IntPtr.Zero,
pvEncoded: IntPtr.Zero,
pcbEncoded: ref encodedLength))
{
var err = Marshal.GetLastWin32Error();
if (err != NativeMethods.ERROR_MORE_DATA)
{
Marshal.ThrowExceptionForHR(NativeMethods.GetHRForWin32Error(err));
}
}
unmanagedEncoded = Marshal.AllocHGlobal((int)encodedLength);
if (!NativeMethods.CryptEncodeObjectEx(
dwCertEncodingType: NativeMethods.X509_ASN_ENCODING | NativeMethods.PKCS_7_ASN_ENCODING,
lpszStructType: new IntPtr(NativeMethods.PKCS_ATTRIBUTE),
pvStructInfo: unmanagedAttr,
dwFlags: 0,
pEncodePara: IntPtr.Zero,
pvEncoded: unmanagedEncoded,
pcbEncoded: ref encodedLength))
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
// Create the structure used to add the attribute
var addAttr = new CMSG_CTRL_ADD_SIGNER_UNAUTH_ATTR_PARA()
{
dwSignerIndex = 0,
BLOB = new CRYPT_INTEGER_BLOB_INTPTR()
{
cbData = encodedLength,
pbData = unmanagedEncoded
}
};
addAttr.cbSize = (uint)Marshal.SizeOf(addAttr);
unmanagedAddAttr = Marshal.AllocHGlobal(Marshal.SizeOf(addAttr));
Marshal.StructureToPtr(addAttr, unmanagedAddAttr, fDeleteOld: false);
// Now store the timestamp in the message... FINALLY
if (!NativeMethods.CryptMsgControl(
_handle,
dwFlags: 0,
dwCtrlType: CMSG_CONTROL_TYPE.CMSG_CTRL_ADD_SIGNER_UNAUTH_ATTR,
pvCtrlPara: unmanagedAddAttr))
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
}
finally
{
NativeUtils.SafeFree(unmanagedTimestamp);
NativeUtils.SafeFree(unmanagedBlob);
NativeUtils.SafeFree(unmanagedAttr);
NativeUtils.SafeFree(unmanagedEncoded);
NativeUtils.SafeFree(unmanagedAddAttr);
}
}
