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_verify_cert(3)

HISTORY
X509_check_issued() first appeared in OpenSSL 0.9.6 and has been available since OpenBSD 2.9.