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
- Convert certificate and private key in PEM format to PFX format.
Openssl pkcs12 -export -out certificate.pfx -inkey privkey.pem -in cert.pem
2. Convert certificate in CRT, DER or CER format to PEM format.
openssl x509 -in cert.crt -out cert.pem -outform PEM
3. Convert private key in KEY format to PEM format.
openssl rsa -in private.key -out private.pem -outform PEM
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