Generate random hex token

Generate a 64-char hex random string (e.g. for API keys)

openssl rand -hex 32
tool
openssl27 commands
tags
opensslsecurity

More openssl commands

  • Full certificate inspect
    openssl x509 -in cert.pem -noout -text

    Dump all cert fields: subject, issuer, validity, extensions, SANs, key usage

  • Cert expiry check (CI gate)
    openssl x509 -in cert.pem -noout -checkend 86400 && echo OK || echo EXPIRING

    Exit 0 if cert valid >24h; perfect for monitoring/CI alerts on expiry

  • Inspect live server chain
    openssl s_client -connect <host>:443 -servername <host> -showcerts </dev/null 2>/dev/null

    Fetch full chain with SNI; -servername is mandatory for vhosts/SNI backends

  • Extract SAN list
    openssl x509 -in cert.pem -noout -ext subjectAltName

    Show only SAN entries; modern browsers ignore CN, so SAN is what matters

  • Verify cert against CA chain
    openssl verify -CAfile ca-chain.pem cert.pem

    Validate trust chain; note: -CAfile must hold intermediates+root in order

all 27 openssl commands