OpenSSL 是一个加解密和SSL/TLS 的工具箱，给我们提供了程序开发的库函数以及命令行工具。

命令语法

openssl cmd -help | [-option | -option arg] ... [arg] ...

命令一览
| asn1parse | OpenSSL application commands |
| ca | OpenSSL application commands |
| CA.pl | friendlier interface for OpenSSL certificate programs |
| ciphers | OpenSSL application commands |
| cms | OpenSSL application commands |
| c_rehash | Create symbolic links to files named by the hash values |
| crl2pkcs7 | OpenSSL application commands |
| crl | OpenSSL application commands |
| dgst | OpenSSL application commands |
| dhparam | OpenSSL application commands |
| dsa | OpenSSL application commands |
| dsaparam | OpenSSL application commands |
| ec | OpenSSL application commands |
| ecparam | OpenSSL application commands |
| enc | OpenSSL application commands |
| engine | OpenSSL application commands |
| errstr | OpenSSL application commands |
| gendsa | OpenSSL application commands |
| genpkey | OpenSSL application commands |
| genrsa | OpenSSL application commands |
| info | OpenSSL application commands |
| kdf | OpenSSL application commands |
| mac | OpenSSL application commands |
| nseq | OpenSSL application commands |
| ocsp | OpenSSL application commands |
| openssl-asn1parse | ASN.1 parsing command |
| openssl-ca | sample minimal CA application |
| openssl-ciphers | SSL cipher display and cipher list command |
| openssl-cmp | client for the Certificate Management Protocol (CMP, RFC 4210) |
| openssl-cms | CMS command |
| openssl-crl2pkcs7 | Create a PKCS#7 structure from a CRL and certificates |
| openssl-crl | CRL command |
| openssl-dgst | perform digest operations |
| openssl-dhparam | DH parameter manipulation and generation |
| openssl-dsa | DSA key processing |
| openssl-dsaparam | DSA parameter manipulation and generation |
| openssl-ec | EC key processing |
| openssl-ecparam | EC parameter manipulation and generation |
| openssl-enc | symmetric cipher routines |
| openssl-engine | load and query engines |
| openssl-errstr | lookup error codes |
| openssl-fipsinstall | perform FIPS configuration installation |
| openssl-gendsa | generate a DSA private key from a set of parameters |
| openssl-genpkey | generate a private key |
| openssl-genrsa | generate an RSA private key |
| openssl | OpenSSL command line program |
| openssl-info | print OpenSSL built-in information |
| openssl-kdf | perform Key Derivation Function operations |
| openssl-list | list algorithms and features |
| openssl-mac | perform Message Authentication Code operations |
| openssl-nseq | create or examine a Netscape certificate sequence |
| openssl-ocsp | Online Certificate Status Protocol command |
| openssl-passwd | compute password hashes |
| openssl-pkcs12 | PKCS#12 file command |
| openssl-pkcs7 | PKCS#7 command |
| openssl-pkcs8 | PKCS#8 format private key conversion command |
| openssl-pkey | public or private key processing command |
| openssl-pkeyparam | public key algorithm parameter processing command |
| openssl-pkeyutl | public key algorithm command |
| openssl-prime | compute prime numbers |
| openssl-provider | load and query providers |
| openssl-rand | generate pseudo-random bytes |
| openssl-rehash | Create symbolic links to files named by the hash values |
| openssl-req | PKCS#10 certificate request and certificate generating command |
| openssl-rsa | RSA key processing command |
| openssl-rsautl | RSA command |
| openssl-s_client | SSL/TLS client program |
| openssl-sess_id | SSL/TLS session handling command |
| openssl-smime | S/MIME command |
| openssl-speed | test library performance |
| openssl-spkac | SPKAC printing and generating command |
| openssl-srp | maintain SRP password file |
| openssl-s_server | SSL/TLS server program |
| openssl-s_time | SSL/TLS performance timing program |
| openssl-storeutl | STORE command |
| openssl-ts | Time Stamping Authority command |
| openssl-verify | certificate verification command |
| openssl-version | print OpenSSL version information |
| openssl-x509 | Certificate display and signing command |
| passwd | OpenSSL application commands |
| pkcs12 | OpenSSL application commands |
| pkcs7 | OpenSSL application commands |
| pkcs8 | OpenSSL application commands |
| pkey | OpenSSL application commands |
| pkeyparam | OpenSSL application commands |
| pkeyutl | OpenSSL application commands |
| prime | OpenSSL application commands |
| rand | OpenSSL application commands |
| rehash | OpenSSL application commands |
| req | OpenSSL application commands |
| rsa | OpenSSL application commands |
| rsautl | OpenSSL application commands |
| s_client | OpenSSL application commands |
| sess_id | OpenSSL application commands |
| smime | OpenSSL application commands |
| speed | OpenSSL application commands |
| spkac | OpenSSL application commands |
| srp | OpenSSL application commands |
| s_server | OpenSSL application commands |
| s_time | OpenSSL application commands |
| storeutl | OpenSSL application commands |
| tsget | Time Stamping HTTP/HTTPS client |
| ts | OpenSSL application commands |
| verify | OpenSSL application commands |
| version | OpenSSL application commands |
| x509 | OpenSSL application commands |