X509_CHECK_ISSUED(3) Library Functions Manual X509_CHECK_ISSUED(3)
NAME
X509_check_issued — check whether a certificate was issued using a given CA certificate
SYNOPSIS
#include <openssl/x509v3.h>
int
X509_check_issued(X509 *issuer, X509 *subject);
DESCRIPTION
This function checks whether the certificate subject was issued using the CA certificate issuer. It does the following checks:
•
match the issuer field of subject against the subject field of issuer
•
if authorityKeyIdentifier is present in the subject certificate, compare it to the subjectKeyIdentifier of issuer
•
check the keyUsage field of issuer.
RETURN VALUES
This function returns X509_V_OK if the certificate subject is issued by issuer, or some X509_V_ERR* constant to indicate an error.
SEE ALSO
X509_check_ca(3), X509_new(3), X509_verify_cert(3)
HISTORY
X509_check_issued() first appeared in OpenSSL 0.9.6 and has been available since OpenBSD 2.9. GNU June 6, 2019 X509_CHECK_ISSUED(3)