Setup Your Own Certificate Authority (CA) on Linux and Use
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XCA is an x509 certificate generation tool, handling RSA, DSA and EC keys, certificate signing requests (PKCS#10) and CRLs. It supports a broad range of import and export formats. OpenSSL - Community Help Wiki Feb 06, 2019
OpenSSL will allow you to look at it if it is installed on your system. openssl x509 -in cerfile.cer -noout -text The format of the .CER file might require that you specify a different encoding format to be explicitly called out. openssl x509 -inform pem -in cerfile.cer -noout -text or. openssl x509 -inform der -in cerfile.cer …
XCA is an x509 certificate generation tool, handling RSA, DSA and EC keys, certificate signing requests (PKCS#10) and CRLs. It supports a broad range of import and export formats. OpenSSL - Community Help Wiki Feb 06, 2019 Manually Generate a Certificate Signing Request (CSR