Openssl req --help

openssl req --help
Usage: req [options]

General options:
 -help                 Display this summary
 -engine val           Use engine, possibly a hardware device
 -keygen_engine val    Specify engine to be used for key generation operations
 -in infile            X.509 request input file (default stdin)
 -inform PEM|DER       Input format - DER or PEM
 -verify               Verify self-signature on the request

Certificate options:
 -new                  New request
 -config infile        Request template file
 -section val          Config section to use (default "req")
 -utf8                 Input characters are UTF8 (default ASCII)
 -nameopt val          Certificate subject/issuer name printing options
 -reqopt val           Various request text options
 -text                 Text form of request
 -x509                 Output an X.509 certificate structure instead of a cert request
 -CA infile            Issuer cert to use for signing a cert, implies -x509
 -CAkey val            Issuer private key to use with -CA; default is -CA arg
                       (Required by some CA's)
 -subj val             Set or modify subject of request or cert
 -subject              Print the subject of the output request or cert
 -multivalue-rdn       Deprecated; multi-valued RDNs support is always on.
 -days +int            Number of days cert is valid for
 -set_serial val       Serial number to use
 -copy_extensions val  copy extensions from request when using -x509
 -addext val           Additional cert extension key=value pair (may be given more than once)
 -extensions val       Cert extension section (override value in config file)
 -reqexts val          Request extension section (override value in config file)
 -precert              Add a poison extension to the generated cert (implies -new)

Keys and Signing options:
 -key val              Key for signing, and to include unless -in given
 -keyform format       Key file format (ENGINE, other values ignored)
 -pubkey               Output public key
 -keyout outfile       File to write private key to
 -passin val           Private key and certificate password source
 -passout val          Output file pass phrase source
 -newkey val           Generate new key with [<alg>:]<nbits> or <alg>[:<file>] or param:<file>
 -pkeyopt val          Public key options as opt:value
 -sigopt val           Signature parameter in n:v form
 -vfyopt val           Verification parameter in n:v form
 -*                    Any supported digest

Output options:
 -out outfile          Output file
 -outform PEM|DER      Output format - DER or PEM
 -batch                Do not ask anything during request generation
 -verbose              Verbose output
 -noenc                Don't encrypt private keys
 -nodes                Don't encrypt private keys; deprecated
 -noout                Do not output REQ
 -newhdr               Output "NEW" in the header lines
 -modulus              RSA modulus

Random state options:
 -rand val             Load the given file(s) into the random number generator
 -writerand outfile    Write random data to the specified file

Provider options:
 -provider-path val    Provider load path (must be before 'provider' argument if required)
 -provider val         Provider to load (can be specified multiple times)
 -propquery val        Property query used when fetching algorithms

See also

• CSR: openssl req [ -x509 ]
• openssl rsa, openssl genrsa