Функции API  (API function)
  
Имя (Name)
gnutls_pkcs7_verify_direct - API function
Синопсис (Synopsis)
#include <gnutls/pkcs7.h>
       int gnutls_pkcs7_verify_direct(gnutls_pkcs7_t pkcs7,
       gnutls_x509_crt_t signer, unsigned idx, const gnutls_datum_t *
       data, unsigned flags);
Аргументы (Arguments)
gnutls_pkcs7_t pkcs7
                   should contain a gnutls_pkcs7_t type
       gnutls_x509_crt_t signer
                   the certificate believed to have signed the structure
       unsigned idx
                   the index of the signature info to check
       const gnutls_datum_t * data
                   The data to be verified or NULL
       unsigned flags
                   Zero or an OR list of gnutls_certificate_verify_flags
Описание (Description)
This function will verify the provided data against the signature
       present in the SignedData of the PKCS 7 structure. If the data
       provided are NULL then the data in the encapsulatedContent field
       will be used instead.
       Note that, unlike gnutls_pkcs7_verify() this function does not
       verify the key purpose of the signer. It is expected for the
       caller to verify the intended purpose of the signer -e.g., via
       gnutls_x509_crt_get_key_purpose_oid(), or
       gnutls_x509_crt_check_key_purpose().
       Note also, that since GnuTLS 3.5.6 this function introduces
       checks in the end certificate ( signer ), including time checks
       and key usage checks.
Возвращаемое значение (Return value)
On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a
       negative error value. A verification error results to a
       GNUTLS_E_PK_SIG_VERIFY_FAILED and the lack of encapsulated data
       to verify to a GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE.
Сообщение об ошибках (Reporting bugs)
Report bugs to <bugs@gnutls.org>.
       Home page: https://www.gnutls.org
Смотри также (See also)
The full documentation for gnutls is maintained as a Texinfo
       manual.  If the /usr/share/doc/gnutls/ directory does not contain
       the HTML form visit
       https://www.gnutls.org/manual/