OpenSSL

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Encrypt a File

openssl aes-256-cbc -a -salt -in daten.txt -out secrets.enc

Decrypt the File

openssl aes-256-cbc -d -a -in secrets.enc -out output.txt

Password Generator

openssl rand -base64 18

Check Certificate

openssl s_client -connect example.com:443

# with SNI
openssl s_client -servername example.com -connect example.com:443

# check files
openssl req -text -noout -verify -in CSR.csr
openssl rsa -in privateKey.key -check
openssl x509 -in certificate.crt -text -noout