How to convert SSL certificate format using OpenSSL(For Omada SDN Controller)
The most common SSL certificates are defined by X.509. The digital certificates have different formats. Here’s a brief overview of several common formats of SSL certificates:
PEM: private key or certificate
CER: only certificate
DER: only certificate
CRT: only certificate
PFX: private key and certificate
P12: private key and certificate
JKS: private key and certificate
KEY: public key or private key
Omada Controller v5.0.30 or below supports SSL certificate in PFX and JKS format, which contains private key and certificate in one file. If the SSL certificate providers provides us with certificates in other formats, we can use OpenSSL(https://www.openssl.org/) to convert private key and certificate to PEM format at first, and then convert PEM certificate to PFX certificate.
Omada Controller v5.1 already supports PEM certificate, so we don’t need to convert PEM certificate to PFX/JKS certificate.
Following are the commands to convert certificate and private key to PFX format in OpenSSL.
1. Convert certificate and private key in PEM format to PFX format.
Openssl pkcs12 -export -out certificate.pfx -inkey privkey.pem -in cert.pem
Note: Export Password is the “Keystore Password” in Omada Controller.
privkey.pem is the private key in PEM format.
cert.pem is the certificate in PEM format.
certificate.pfx is the SSL certificate in PFX format.
2. Convert certificate in CRT, DER or CER format to PEM format.
openssl x509 -in cert.crt -out cert.pem -outform PEM
cert.crt is the certificate in CRT format. We also can replace it with certificate in DER or CER format.
cert.pem is the certificate in PEM format.
3. Convert private key in KEY format to PEM format.
openssl rsa -in private.key -out private.pem -outform PEM
Note: pass phrase is the password of private key.
private.key is the private key in KEY format.
Private.pem is the private key in PEM format.
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