Return an ASN.1 octet string from a PKCS#7 structure.
Declared in <openssl/pkcs7.h>
<openssl/pkcs7.h>
ASN1_OCTET_STRING* PKCS7_get_octet_string(PKCS7* p7);
Pointer to an internal ASN1_OCTET_STRING, or NULL if the structure cannot be parsed. The returned pointer must not be freed by the caller.