【CA】Overview of Certificate Filetype & How to covert it with Openssl

| 分类 安全工程师  | 标签 PKI  证书  安全随笔 

Overview of Cert filetype

  • PEM This is a (Privacy-enhanced Electronic Mail) Base64 encoded DER certificate, enclosed between “—–BEGIN CERTIFICATE—–” and “—–END CERTIFICATE—–“ openssl req -newkey rsa:2048 -new -nodes -x509 -days 3650 -keyout key.pem -out cert.pem

  • CER & CRT & DER Although usually in binary DER form, Base64-encoded certificates are also common (see .pem above). ``

  • P7B & P7C PKCS#7 SignedData structure without data, just certificate(s) or CRL(s)

  • P12
    PKCS#12 files may contain certificate(s) (public) and private keys (password protected).

  • PFX PFX is the predecessor of PKCS#12. This type of file usually contains data in PKCS#12 format (e.g., with PFX files generated in IIS). openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in certificate.crt -certfile more.crt

Openssl Tutorial & Cert Convert

OpenSSL Convert PEM

  • 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

OpenSSL Convert DER

  • Convert DER to PEM openssl x509 -inform der -in certificate.cer -out certificate.pem

OpenSSL Convert P7B

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

  • Convert 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

OpenSSL Convert PFX

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


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