openssl crl -in root.crl -text -noout openssl verify -crl_check -CAfile root.crt -CRLfile root.crl server.crt openssl rand -base64 32 9. Conclusion OpenSSL on Windows 11 is not merely a port of a Linux utility; it is an essential cryptographic Swiss Army knife that fills gaps left by native Windows tools. Through careful selection of installation method – whether precompiled binaries for simplicity, WSL for Linux compatibility, or Git Bash for lightweight use – professionals can integrate OpenSSL seamlessly into their Windows workflows. Mastery of key generation, CSR creation, certificate conversion, and TLS testing empowers administrators to secure internal services, debug production issues, and automate certificate lifecycle management.
openssl genpkey -algorithm RSA -out private.key -pkeyopt rsa_keygen_bits:2048 Alternative legacy: openssl genrsa -out private.key 2048 openssl for windows 11
Import-Certificate -FilePath "C:\path\to\root.cer" -CertStoreLocation "Cert:\LocalMachine\Root" PowerShell can call OpenSSL directly. Example function to generate a self-signed cert for IIS testing: openssl crl -in root
openssl s_client -connect cloudflare.com:443 -tls1_3 Run in Command Prompt, PowerShell, or Windows Terminal
[ req ] default_bits = 2048 default_keyfile = privkey.pem distinguished_name = req_distinguished_name string_mask = utf8only [ req_distinguished_name ] countryName = Country Name (2 letter code) countryName_default = US stateOrProvinceName = State or Province Name stateOrProvinceName_default = California localityName = Locality Name 0.organizationName = Organization Name organizationalUnitName = Organizational Unit Name commonName = Common Name (FQDN) commonName_default = localhost emailAddress = Email Address All commands below assume OpenSSL is in PATH and openssl.cnf is correctly configured. Run in Command Prompt, PowerShell, or Windows Terminal. 4.1 Key and Certificate Generation 4.1.1 Generate an RSA Private Key (2048-bit)
openssl req -x509 -new -nodes -key private.key -sha256 -days 365 -out certificate.crt Or a single command without separate key file: