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(mozilla-projects-nss-cert-findcertbyissuerandsn)=
# CERT_FindCertByIssuerAndSN
:::{container}
Find a certificate in the database with the given issuer and serial number.
:::
## [Syntax](#syntax)
:::{container}
```{code}
#include <cert.h>
CERTCertificate *CERT_FindCertByIssuerAndSN (
CERTCertDBHandle *handle,
CERTIssuerAndSN *issuerAndSN );
```
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## [Parameters](#parameters)
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```{eval-rst}
+-----------------+-------------------------------------------------------------------------------+
| ``handle`` | *in* pointer to a `CERTCertDBHandle </en-US/NSS/CERTCertDBHandle>`__ |
| | representing the certificate database to look in |
+-----------------+-------------------------------------------------------------------------------+
| ``issuerAndSN`` | *in* pointer to a `CERTIssuerAndSN </en-US/NSS/CERTIssuerAndSN>`__ that must |
| | be properly formed to contain the issuer name and the serial number (see |
| | [Example]) |
+-----------------+-------------------------------------------------------------------------------+
```
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## [Description](#description)
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This function creates a certificate key using the `issuerAndSN` and it then uses the key to
find the matching certificate in the database.
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## [Returns](#returns)
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A pointer to a [CERTCertificate](/en-US/NSS/CERTCertificate) representing the certificate in
the database that matched the issuer and serial number, or `NULL` if none was found. The
certificate is a shallow copy, use
[CERT_DestroyCertificate](/en-US/NSS/CERT_DestroyCertificate) to decrement the reference count
on the certificate instance.
:::
## [Example](#example)
:::{container}
```{code}
CERTIssuerAndSN issuerSN;
issuerSN.derIssuer.data = caName->data;
issuerSN.derIssuer.len = caName->len;
issuerSN.serialNumber.data = authorityKeyID->authCertSerialNumber.data;
issuerSN.serialNumber.len = authorityKeyID->authCertSerialNumber.len;
issuerCert = CERT_FindCertByIssuerAndSN(cert->dbhandle, &issuerSN);
if ( issuerCert == NULL ) {
PORT_SetError (SEC_ERROR_UNKNOWN_ISSUER);
}
```
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## [See Also](#see_also)
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Occurrences of
`` `CERT_FindCertByIssuerAndSN `` \<<http://lxr.mozilla.org/security/ident?i=CERT_FindCertByIssuerAndSN>>\`\_\_
:::