====== Convert certificates with OpenSSL ======
===== DER =====
<code bash| Convert a DER file (.crt .cer .der) to PEM>
openssl x509 -inform der -in certificate.cer -out certificate.pem
</code>

===== PEM =====
<code bash| Convert a PEM file to DER>
openssl x509 -outform der -in certificate.pem -out certificate.der
</code>
<code bash| Convert a PEM file to P7B>
openssl crl2pkcs7 -nocrl -certfile certificate.cer -out certificate.p7b -certfile CACert.cer
</code>
<code bash| Convert a PEM certificate file and a private key to PKCS#12 (.pfx .p12)>
openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in certificate.crt -certfile CACert.crt
</code>

===== PFX =====
<code bash| Convert a PKCS#12 file (.pfx .p12) containing a private key and certificates to PEM>
openssl pkcs12 -in keyStore.pfx -out keyStore.pem -nodes
</code>
You can add **-nocerts** to only output the private key or add -nokeys to only output the certificates.

===== P7B =====
<code bash| Convert a P7B to PEM>
openssl pkcs7 -print_certs -in certificate.p7b -out certificate.cer
</code>
<code bash| Convert a P7B to PFX>
openssl pkcs7 -print_certs -in certificate.p7b -out certificate.cer
openssl pkcs12 -export -in certificate.cer -inkey privateKey.key -out certificate.pfx -certfile CACert.cer
</code>

===== Other commands =====
<code bash| Export public key from private key>
openssl rsa -in privkey.pem -pubout > key.pub
</code>

<code bash| Remove password from private key>
openssl rsa -in [file1.key] -out [file2.key]
</code>