X509_check_issued - checks if certificate is apparently issued by another
int X509_check_issued(X509 *issuer, X509 *subject);
X509_check_issued() checks if certificate subject was apparently
issued using (CA) certificate issuer. This function takes into account
not only matching of the issuer field of subject with the subject field
of issuer, but also compares all sub-fields of the
authorityKeyIdentifier extension of subject, as far as present,
with the respective subjectKeyIdentifier, serial number, and issuer
fields of issuer, as far as present. It also checks if the
keyUsage field (if present) of issuer allows certificate
signing. It does not check the certificate signature.
Function return X509_V_OK if certificate subject is issued by
issuer or some X509_V_ERR* constant to indicate an error.
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