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官方排版太差，自己整理了下

https://openhome.alipay.com/platform/document.htm#webApp-intro-safe-RSA
Linux用户（以Ubuntu为例）

$ openssl 进入OpenSSL程序

OpenSSL> genrsa -out rsa_private_key.pem 1024
生成私钥

OpenSSL> rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem
生成公钥

OpenSSL> exit

#### 1. OpenSSL https://www.openssl.org/

是一个开源项目，目的是
implementing the Transport Layer Security (TLS)
and Secure Sockets Layer (SSL) protocols
as well as a full-strength general purpose cryptography library.

#### 2. genrsa --- generate an RSA private key --- 生成 RSA 私钥

https://www.openssl.org/docs/manmaster/apps/genrsa.html

-out 是输出文件名
1024 是 numbits
the size of the private key to generate in bits. This must be the last option specified. The default is 512.

#### 3. rsa --- RSA key processing tool --- RSA key 处理工具

https://www.openssl.org/docs/manmaster/apps/rsa.html

-in 是输入文件名
-out 是输出文件名
-pubout

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