Convertendo entre formatos de pkcs

Convert P7B to PEM
openssl pkcs7 -inform DER -outform PEM -in certname.p7b -out certname.pem -print_certs

Convert PEM to DER
openssl x509 -outform der -in certificate.pem -out certificate.der

Convert PEM to P7B
openssl crl2pkcs7 -nocrl -certfile certificate.cer -out certificate.p7b -certfile CACert.cer

Convert PEM to PFX
openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in certificate.crt -certfile CACert.crt

Convert DER to PEM or CRT to PEM
openssl x509 -inform der -in certificate.cer -out certificate.pem
openssl x509 -inform der -in certificadoACRaiz.crt -out certificate.pem

Convert P7B to PFX
openssl pkcs7 -print_certs -in certificate.p7b -out certificate.cer

OpenSSL Convert PFX
openssl pkcs12 -export -in certificate.cer -inkey privateKey.key -out certificate.pfx -certfile CACert.cer

Convert PFX to PEM
openssl pkcs12 -in certificate.pfx -out certificate.cer -nodes