OpenSSL-Version : 1.0.2k

DESCRIPTION

   OpenSSL is a cryptography toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) network protocols and related cryptography standards required by them.

   The openssl program is a command line tool for using the various cryptography functions of OpenSSL's crypto library from the shell.  It can be used for

    o  Creation and management of private keys, public keys and parameters
    o  Public key cryptographic operations
    o  Creation of X.509 certificates, CSRs and CRLs
    o  Calculation of Message Digests
    o  Encryption and Decryption with Ciphers
    o  SSL/TLS Client and Server Tests
    o  Handling of S/MIME signed or encrypted mail
    o  Time Stamp requests, generation and verification

OpenSSL介绍

OpenSSL是一个加密工具包，实现了安全套接字层(SSL v2/ v3)和传输层安全(TLS v1)网络协议以及它们所要求的相关密码学标准。

openssl程序是一个命令行工具，用于从shell中使用openssl的crypto库的各种密码学功能。它可以被用来做

OpenSSL是一个安全工具集，同时也提供了开源程序库。它支持ssl(Secure Sockets Layer, v2/v3)，TLS(Transport Layer Secure, v1)。这套工具集的应用范围非常之广，包括：

创建和管理私钥、公钥。
公钥加密操作。
创建X.509证书（Certificate），证书请求（CSR），证书撤销（CRL）。
计算消息摘要（MD5, SHA-1等）。
使用密码加解密（Encryption/Decryption with Ciphers）。
SSL/TLS 客户端/服务器测试。
处理S/MIME签名以及加密邮件。
# openssl --help
openssl:Error: '--help' is an invalid command.

Standard commands
asn1parse         ca                ciphers           cms               
crl               crl2pkcs7         dgst              dh                
dhparam           dsa               dsaparam          ec                
ecparam           enc               engine            errstr            
gendh             gendsa            genpkey           genrsa            
nseq              ocsp              passwd            pkcs12            
pkcs7             pkcs8             pkey              pkeyparam         
pkeyutl           prime             rand              req               
rsa               rsautl            s_client          s_server          
s_time            sess_id           smime             speed             
spkac             ts                verify            version           
x509              

Message Digest commands (see the `dgst' command for more details)
md2               md4               md5               rmd160            
sha               sha1              

Cipher commands (see the `enc' command for more details)
aes-128-cbc       aes-128-ecb       aes-192-cbc       aes-192-ecb       
aes-256-cbc       aes-256-ecb       base64            bf                
bf-cbc            bf-cfb            bf-ecb            bf-ofb            
camellia-128-cbc  camellia-128-ecb  camellia-192-cbc  camellia-192-ecb  
camellia-256-cbc  camellia-256-ecb  cast              cast-cbc          
cast5-cbc         cast5-cfb         cast5-ecb         cast5-ofb         
des               des-cbc           des-cfb           des-ecb           
des-ede           des-ede-cbc       des-ede-cfb       des-ede-ofb       
des-ede3          des-ede3-cbc      des-ede3-cfb      des-ede3-ofb      
des-ofb           des3              desx              idea              
idea-cbc          idea-cfb          idea-ecb          idea-ofb          
rc2               rc2-40-cbc        rc2-64-cbc        rc2-cbc           
rc2-cfb           rc2-ecb           rc2-ofb           rc4               
rc4-40            rc5               rc5-cbc           rc5-cfb           
rc5-ecb           rc5-ofb           seed              seed-cbc          
seed-cfb          seed-ecb          seed-ofb          zlib

SYNOPSIS

openssl command [ command_opts ] [ command_args ]
openssl [ list-standard-commands | list-message-digest-commands | list-cipher-commands ]

openssl list-standard-commands(标准命令)