openssl

加密算法：
    对称加密算法：
       DES、IDEA、RC2、RC4、AES、Skipjack ......
    非对称加密算法：
       RSA、DSA、DiffieHellman、PKCS、PGP ......

单向的HASH算法属于报文摘要算法，虽然有些也出自OpenSSL库。
   

命令操作：
    1、生成普通私钥：

[weigw@TEST src]$ openssl genrsa -out privatekey.key 1024

Generating RSA private key, 1024 bit long modulus ....++++++ .......++++++ e is 65537 (0x10001)

    2、生成带加密口令的密钥：

[weigw@TEST src]$ openssl genrsa -des3 -out privatekey.key 1024

Generating RSA private key, 1024 bit long modulus ............++++++ .....................++++++ e is 65537 (0x10001) Enter pass phrase for privatekey.key: Verifying - Enter pass phrase for privatekey.key:

   
    在生成带加密口令的密钥时需要自己去输入密码。对于为密钥加密现在提供了一下几种算法：

-des encrypt the generated key with DES in cbc mode

-des3 encrypt the generated key with DES in ede cbc mode (168 bit key)

-aes128, -aes192, -aes256 encrypt PEM output with cbc aes

    去除密钥的口令：

[weigw@TEST src]$ openssl rsa -in privatekey.key -out

privatekey.key Enter pass phrase for privatekey.key: writing RSA key

    通过生成的私钥去生成证书：

[weigw@TEST src]$ openssl req -new -x509 -key privatekey.key -out cacert.crt -days 1095

You are about to be asked to enter information that will be incorporated into your certificate request.

What you are about to enter is what is called a Distinguished Name or a DN. There are quite a few fields but you can leave some blank For some fields there will be a default value, If you enter '.', the field will be left blank.

-----

Country Name (2 letter code) [GB]:CN

State or Province Name (full name) [Berkshire]:beijing

Locality Name (eg, city) [Newbury]:beijing

Organization Name (eg, company) [My Company Ltd]:wondersoft

Organizational Unit Name (eg, section) []:develop

Common Name (eg, your name or your server's hostname) []:WeiGW

Email Address []:[e-mail]

    在生成证书的时候需要按照提示输入一些个人信息。

    通过私钥生成公钥：

[weigw@TEST src]$ openssl rsa -in privatekey.key -pubout -out pubkey.key writing RSA key

   格式转换：（证书、私钥、公钥）（PEM <----->DER）

[weigw@TEST src]$ openssl x509 -in cacert.crt -inform PEM -out cacert.der -outform DER

[weigw@TEST src]$

[weigw@TEST src]$ openssl rsa -in privatekey.key -inform PEM -out privatekey.der -outform DER

writing RSA key

[weigw@TEST src]$ openssl rsa -pubin -in pubkey.key -inform PEM -pubout -out pubkey.der -outform DER

writing RSA key

    从DER格式转换成PEM格式一样，就是把inform的格式改成DERoutform的格式改成PEM即可。


下面是一个服务器和客户端认证的证书、私钥生成方法：（server.crt、client.crt、ca.crt）

第一步： 生成私钥

[weigw@TEST bin]$ openssl genrsa -out server.key 1024

Generating RSA private key, 1024 bit long modulus .++++++ ..........................++++++ e is 65537 (0x10001)

[weigw@TEST bin]$ openssl genrsa -out client.key 1024

Generating RSA private key, 1024 bit long modulus ...++++++ ....................................................++++++ e is 65537 (0x10001)

[weigw@TEST bin]$ openssl genrsa -out ca.key 1024

Generating RSA private key, 1024 bit long modulus .............................................................++++++ .........++++++ e is 65537 (0x10001)

[weigw@TEST bin]$

第二步： 证书请求

[weigw@TEST bin]$ openssl req -new -key server.key -out server.csr -days 1095

[weigw@TEST bin]$ openssl req -new -key client.key -out client.csr -days 1095

[weigw@TEST bin]$ openssl req -new -x509 -key ca.key -out ca.crt -days 1095

第三步： 申请证书（为请求文件签名）

[weigw@TEST bin]$ openssl ca -in server.csr -out server.crt -cert ca.crt -keyfile ca.key

[weigw@TEST bin]$ openssl ca -in client.csr -out client.crt -cert ca.crt -keyfile ca.key

如果在这步出现错误信息：

[weigw@TEST bin]$ openssl ca -in client.csr -out client.crt -cert ca.crt -keyfile ca.key

Using configuration from /usr/share/ssl/openssl.cnf I am unable to access the ./demoCA/newcerts directory ./demoCA/newcerts: No such file or directory

[weigw@TEST bin]$

自己手动创建一个CA目录结构：
[weigw@TEST bin]$ mkdir ./demoCA
[weigw@TEST bin]$ mkdir demoCA/newcerts
创建个空文件：
[weigw@TEST bin]$ vi demoCA/index.txt
向文件中写入01：
[weigw@TEST bin]$ vi demoCA/serial

合并证书文件（crt）和私钥文件（key）：

[weigw@TEST bin]$ cat client.crt client.key > client.pem [weigw@TEST bin]$ cat server.crt server.key > server.pem

合并成pfx证书：

[weigw@TEST bin]$ openssl pkcs12 -export -clcerts -in client.crt -inkey client.key -out client.p12

Enter Export Password:

Verifying - Enter Export Password:

[weigw@TEST bin]$openssl pkcs12 -export -clcerts -in server.crt -inkey server.key -out server.p12
Enter Export Password:
Verifying - Enter Export Password:

文本化证书：

[weigw@TEST bin]$ openssl pkcs12 -in client.p12 -out client.txt Enter Import Password:

MAC verified OK

Enter PEM pass phrase: Verifying - Enter PEM pass phrase:

[weigw@TEST bin]$openssl pkcs12 -in server.p12 -out server.txt

Enter Import Password:

MAC verified OK

Enter PEM pass phrase: Verifying - Enter PEM pass phrase:

屏幕模式显式：（证书、私钥、公钥）

[weigw@TEST bin]$ openssl x509 -in client.crt -noout -text -modulus

[weigw@TEST bin]$ openssl rsa -in server.key -noout -text -modulus

[weigw@TEST bin]$ openssl rsa -in server.pub -noout -text -modulus

得到DH：

[weigw@TEST bin]$ openssl dhparam -out dh1024.pem 1024

 

来源：http://blog.chinaunix.net/u/16340/showart_2102147.html