Add X509_get0_authority_key_id() function

  This function makes it easier to retrieve a reference to the
  authority key identifier (akid->keyid) inside a certificate.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5271)

1 files changed, 6 insertions, 0 deletions

diff --git a/doc/man3/X509_get_extension_flags.pod b/doc/man3/X509_get_extension_flags.pod
index 9aec918f24..fc4ebbb31d 100644
--- a/doc/man3/X509_get_extension_flags.pod
+++ b/doc/man3/X509_get_extension_flags.pod
@@ -3,6 +3,7 @@
 =head1 NAME
 
 X509_get0_subject_key_id,
+X509_get0_authority_key_id,
 X509_get_pathlen,
 X509_get_extension_flags,
 X509_get_key_usage,
@@ -20,6 +21,7 @@ X509_get_proxy_pathlen - retrieve certificate extension data
  uint32_t X509_get_key_usage(X509 *x);
  uint32_t X509_get_extended_key_usage(X509 *x);
  const ASN1_OCTET_STRING *X509_get0_subject_key_id(X509 *x);
+ const ASN1_OCTET_STRING *X509_get0_authority_key_id(X509 *x);
  void X509_set_proxy_flag(X509 *x);
  void X509_set_proxy_pathlen(int l);
  long X509_get_proxy_pathlen(X509 *x);
@@ -109,6 +111,10 @@ X509_get0_subject_key_id() returns an internal pointer to the subject key
 identifier of B<x> as an B<ASN1_OCTET_STRING> or B<NULL> if the extension
 is not present or cannot be parsed.
 
+X509_get0_authority_key_id() returns an internal pointer to the authority key
+identifier of B<x> as an B<ASN1_OCTET_STRING> or B<NULL> if the extension
+is not present or cannot be parsed.
+
 X509_set_proxy_flag() marks the certificate with the B<EXFLAG_PROXY> flag.
 This is for the users who need to mark non-RFC3820 proxy certificates as
 such, as OpenSSL only detects RFC3820 compliant ones.