CryptGetMessageSignerCount (Compact 2013)

3/28/2014

This function returns the number of signers of a signed message.

Syntax

LONG WINAPI CryptGetMessageSignerCount(
     __in  DWORD dwMsgEncodingType,
      __in  const BYTE* pbSignedBlob,
      __in  DWORD cbSignedBlob
);

Parameters

• dwMsgEncodingType
  [in] Encoding type that is used. It is always acceptable to specify both the certificate and message encoding types by combining them with a bitwise OR operation as shown in the following example:

  X509_ASN_ENCODING | PKCS_7_ASN_ENCODING

  Currently defined encoding types are:

  • X509_ASN_ENCODING
  • PKCS_7_ASN_ENCODING

• pbSignedBlob
  [in] Pointer to a buffer containing the signed message.

• cbSignedBlob
  [in] Size, in bytes, of the signed message.

Return Value

Returns the number of signers of a signed message if the function succeeds, 0 (zero) when there are no signers, and -1 (minus one) for an error. To retrieve extended error information, call GetLastError.

The following error code is most commonly returned by the GetLastError function.

If the function fails, GetLastError may return an Abstract Syntax Notation One (ASN.1) encoding/decoding error. For information about these errors, see ASN.1 Encoding/Decoding Return Values.

Requirements

See Also

Reference

Certificates Functions