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Title "X509V3_GET_EXT_BY_NID 3"
way too many mistakes in technical documents.
\fBX509v3_get_ext() retrieves extension loc from x. The index loc can take any value from 0 to X509_get_ext_count(x) - 1. The returned extension is an internal pointer which must not be freed up by the application.
\fBX509v3_get_ext_by_NID() and X509v3_get_ext_by_OBJ() look for an extension with nid or obj from extension stack x. The search starts from the extension after lastpos or from the beginning if <lastpos> is -1. If the extension is found its index is returned otherwise -1 is returned.
\fBX509v3_get_ext_by_critical() is similar to X509v3_get_ext_by_NID() except it looks for an extension of criticality crit. A zero value for crit looks for a non-critical extension a non-zero value looks for a critical extension.
\fBX509v3_delete_ext() deletes the extension with index loc from x. The deleted extension is returned and must be freed by the caller. If loc is in invalid index value \s-1NULL\s0 is returned.
\fBX509v3_add_ext() adds extension ex to stack *x at position loc. If \fBloc is -1 the new extension is added to the end. If *x is \s-1NULL\s0 a new stack will be allocated. The passed extension ex is duplicated internally so it must be freed after use.
\fBX509_get_ext_count(), X509_get_ext(), X509_get_ext_by_NID(), \fBX509_get_ext_by_OBJ(), X509_get_ext_by_critical(), X509_delete_ext() and X509_add_ext() operate on the extensions of certificate x they are otherwise identical to the X509v3 functions.
\fBX509_CRL_get_ext_count(), X509_CRL_get_ext(), X509_CRL_get_ext_by_NID(), \fBX509_CRL_get_ext_by_OBJ(), X509_CRL_get_ext_by_critical(), \fBX509_CRL_delete_ext() and X509_CRL_add_ext() operate on the extensions of \s-1CRL\s0 x they are otherwise identical to the X509v3 functions.
\fBX509_REVOKED_get_ext_count(), X509_REVOKED_get_ext(), \fBX509_REVOKED_get_ext_by_NID(), X509_REVOKED_get_ext_by_OBJ(), \fBX509_REVOKED_get_ext_by_critical(), X509_REVOKED_delete_ext() and \fBX509_REVOKED_add_ext() operate on the extensions of \s-1CRL\s0 entry x they are otherwise identical to the X509v3 functions.
Extension indices start from zero, so a zero index return value is not an error. These search functions start from the extension after the lastpos parameter so it should initially be set to -1, if it is set to zero the initial extension will not be checked.
\fBX509v3_get_ext(), X509v3_delete_ext() and X509_delete_ext() return an \fBX509_EXTENSION pointer or \s-1NULL\s0 if an error occurs.
\fBX509v3_get_ext_by_NID() X509v3_get_ext_by_OBJ() and \fBX509v3_get_ext_by_critical() return the an extension index or -1 if an error occurs.
\fBX509v3_add_ext() returns a stack of extensions or \s-1NULL\s0 on error.
\fBX509_add_ext() returns 1 on success and 0 on error.
Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.