Конвертация сертификатов в разные форматы

Certificates 
Converting PEM encoded certificate to DER
openssl x509 -outform der -in certificate.pem -out certificate.der
 
Converting DER encoded certificate to PEM
openssl x509 -inform der -in certificate.cer -out certificate.pem
 
Converting PEM encoded certificates to PKCS7 (P7B)
openssl crl2pkcs7 -nocrl -certfile certificate.cer -out certificate.p7b -certfile CACert.cer
 
Converting PKCS #7 (P7B) to PEM encoded certificates
openssl pkcs7 -print_certs -in certificate.p7b -out certificate.cer
 
Certificates and Keys
Converting PEM encoded Certificate and private key to PKCS #12 / PFX
openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in certificate.crt -certfile CACert.crt
 
Converting PKCS #7 (P7B) and private key to PKCS #12 / 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
 
Converting PKCS #12 / PFX to PKCS #7 (P7B) and private key
openssl pkcs12 -in certificate.pfx -out certificate.cer -nodes

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