This function will return the data embedded in the signature of
the PKCS7 structure. If no data are available then
GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will be returned.
The returned data must be de-allocated using gnutls_free().
Note, that this function returns the exact same data that are
authenticated. If the GNUTLS_PKCS7_EDATA_GET_RAW flag is
provided, the returned data will be including the wrapping
tag/value as they are encoded in the structure.
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