X509_NAME_add_entry_by_txt, X509_NAME_add_entry_by_OBJ, X509_NAME_add_entry_by_NID, X509_NAME_add_entry, X509_NAME_delete_entry - X509_NAME modification functions
int X509_NAME_add_entry_by_txt(X509_NAME *name, const char *field, int type, const unsigned char *bytes, int len, int loc, int set);
int X509_NAME_add_entry_by_OBJ(X509_NAME *name, ASN1_OBJECT *obj, int type, unsigned char *bytes, int len, int loc, int set);
int X509_NAME_add_entry_by_NID(X509_NAME *name, int nid, int type, unsigned char *bytes, int len, int loc, int set);
int X509_NAME_add_entry(X509_NAME *name,X509_NAME_ENTRY *ne, int loc, int set);
X509_NAME_ENTRY *X509_NAME_delete_entry(X509_NAME *name, int loc);
The type of field is determined by type which can either be a definition of the type of bytes (such as MBSTRING_ASC) or a standard ASN1 type (such as V_ASN1_IA5STRING). The new entry is added to a position determined by loc and set.
The use of string types such as MBSTRING_ASC or MBSTRING_UTF8
is strongly recommended for the type parameter. This allows the internal code to correctly determine the type of
the field and to apply length checks according to the relevant standards.
This is done using
If instead an ASN1 type is used no checks are performed and the supplied data in bytes is used directly.
The loc and set parameters determine where a new entry should be added. For almost all applications loc can be set to -1 and set to 0. This adds a new entry to the end of name as a single valued RelativeDistinguishedName (RDN).
loc actually determines the index where the new entry is inserted: if it is -1 it is appended.
set determines how the new type is added. If it is zero a new RDN is created.
If set is -1 or 1 it is added to the previous or next RDN structure respectively. This will then be a multivalued RDN: since multivalues RDNs are very seldom used set is almost always set to zero.
Create an X509_NAME structure:
``C=UK, O=Disorganized Organization, CN=Joe Bloggs''
X509_NAME *nm; nm = X509_NAME_new(); if (nm == NULL) /* Some error */ if (!X509_NAME_add_entry_by_txt(nm, MBSTRING_ASC, "C", "UK", -1, -1, 0)) /* Error */ if (!X509_NAME_add_entry_by_txt(nm, MBSTRING_ASC, "O", "Disorganized Organization", -1, -1, 0)) /* Error */ if (!X509_NAME_add_entry_by_txt(nm, MBSTRING_ASC, "CN", "Joe Bloggs", -1, -1, 0)) /* Error */
type can still be set to V_ASN1_APP_CHOOSE to use a different algorithm to determine field types. Since this form does not understand multicharacter types, performs no length checks and can result in invalid field types its use is strongly discouraged.