This structure is used to add an unauthenticated attribute to a signer of a signed message. This structure is passed to CryptMsgControl if the dwCtrlType parameter is set to CMSG_CTRL_ADD_SIGNER_UNAUTH_ATTR.
Size of this structure in bytes.
Index of the signer in the rgSigners array indicated in the CMSG_SIGNER_ENCODE_INFO structure that represents the signed message. The unauthenticated attribute is to be added to the signer's information.
CRYPT_DATA_BLOB structure that contains the encoded unauthenticated attribute as its pbData member.