print digital signature infos - c++

Question

As in the title specified, I'd like to print the digital signature information out to the console. Here is the code I wrote:
bool CheckDigSig(const std::wstring& filepath)
{
bool rval = false;
DWORD dwEncoding = 0;
DWORD dwContentType = 0;
DWORD dwFormatType = 0;
HCERTSTORE hStore = NULL;
HCRYPTMSG hMsg = NULL;
// Get message handle and store handle from the signed file.
BOOL fResult = CryptQueryObject(CERT_QUERY_OBJECT_FILE,
filepath.c_str(),
CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED_EMBED,
CERT_QUERY_FORMAT_FLAG_BINARY,
0,
&dwEncoding,
&dwContentType,
&dwFormatType,
&hStore,
&hMsg,
NULL);
if (!fResult)
return false;
DWORD singer_info_size = 0;
// Get signer information size.
fResult = CryptMsgGetParam(hMsg, CMSG_SIGNER_INFO_PARAM, 0, NULL, &singer_info_size);
if (!fResult)
{
CryptMsgClose(hMsg);
CertCloseStore(hStore, 0);
return false;
}
// Allocate memory for signer information.
std::vector<byte> signer_info_data(singer_info_size);
PCMSG_SIGNER_INFO pSignerInfo = reinterpret_cast<PCMSG_SIGNER_INFO>(signer_info_data.data());
// Get Signer Information.
fResult = CryptMsgGetParam(hMsg, CMSG_SIGNER_INFO_PARAM, 0, (PVOID)pSignerInfo, &singer_info_size);
if (fResult)
{
//pSignerInfo->Issuer;
//pSignerInfo->SerialNumber;
}
CryptMsgClose(hMsg);
CertCloseStore(hStore, 0);
return rval;
}
I would like to print those two variables at the end (which is now commendted):
pSignerInfo->Issuer;
pSignerInfo->SerialNumber;
I've got no idea how could I make it readable format, like a string, byte or char array. Could you help me with it?

Answer 1

This article http://support.microsoft.com/kb/323809 has the code you need. Here's a short snippet of it:
// Get Issuer name.
if (!(CertGetNameString(pCertContext,
CERT_NAME_SIMPLE_DISPLAY_TYPE,
CERT_NAME_ISSUER_FLAG,
NULL,
szName,
dwData)))
// ...
There's more code in there, obviously, covering all the various corners of this task. Including printing the SerialNumber as well