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.tr \(*W- . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\}
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.. .nr rF 0 . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF Fear. Run. Save yourself. No user-serviceable parts.
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Title "X509V3_GET_EXT_BY_NID 3ossl"
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 \s-1MUST NOT\s0 be freed by the application.
\fBX509v3_get_ext_by_NID() and X509v3_get_ext_by_OBJ() look for an extension with nid or obj from extension \s-1STACK\s0 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 nonzero 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 an invalid index value, \s-1NULL\s0 is returned.
\fBX509v3_add_ext() adds extension ex to \s-1STACK\s0 *x at position loc. If \fIloc is -1, the new extension is added to the end. If *x is \s-1NULL,\s0 a new \s-1STACK\s0 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.
For X509v3_get_ext_by_NID(), X509v3_get_ext_by_OBJ(), \fBX509v3_get_ext_by_critical() and its variants, a zero index return value is not an error since extension \s-1STACK\s0 x indices start from zero. 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_delete_ext() and its variants are a bit counter-intuitive because these functions do not free the extension they delete. They return an X509_EXTENSION object which must be explicitly freed using X509_EXTENSION_free().
\fBX509v3_get_ext(), X509v3_delete_ext() and X509_delete_ext() return an \fBX509_EXTENSION structure or \s-1NULL\s0 if an error occurs.
\fBX509v3_get_ext_by_OBJ() and X509v3_get_ext_by_critical() return the extension index or -1 if an error occurs.
\fBX509v3_get_ext_by_NID() returns the extension index or negative values if an error occurs.
\fBX509v3_add_ext() returns a \s-1STACK\s0 of extensions or \s-1NULL\s0 on error.
\fBX509_add_ext() returns 1 on success and 0 on error.
Licensed under the Apache License 2.0 (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>.