Openssl rsa命令

一、简介

Rsa命令用于处理RSA密钥、格式转换和打印信息

二、语法

openssl rsa [-inform PEM|NET|DER] [-outform PEM|NET|DER] [-in filename] [-passin arg] [-out filename] [-passout arg] [-sgckey] [-text] [-noout] [-modulus] [-check] [-pubin] [-pubout] [-engine id] [-des] [-des3] [-idea]

选项

 -inform arg     input format - one of DER NET PEM
 -outform arg    output format - one of DER NET PEM
 -in arg         input file
 -sgckey         Use IIS SGC key format
 -passin arg     input file pass phrase source
 -out arg        output file
 -passout arg    output file pass phrase source
 -des            encrypt PEM output with cbc des
 -des3           encrypt PEM output with ede cbc des using  bit key
 -idea           encrypt PEM output with cbc idea
 -seed           encrypt PEM output with cbc seed
 -aes128, -aes192, -aes256
                 encrypt PEM output with cbc aes
 -camellia128, -camellia192, -camellia256
                 encrypt PEM output with cbc camellia
 -text           print the key in text
 -noout          don't print key out
 -modulus        print the RSA key modulus
 -check          verify key consistency
 -pubin          expect a public key in input file
 -pubout         output a public key
 -engine e       use engine e, possibly a hardware device.

 -RSAPublicKey_out 

三、实例

1、pem转换为der

openssl rsa -in prikey.pem -outform der -out prikey.der

2、从私钥提取公钥

openssl rsa -in prikey.pem -out pubkey.pem -pubout

3、查看公钥信息

openssl rsa -pubin -in pubkey.pem -text

4、查看私钥信息

openssl rsa -in prikey.pem -passin pass:"" -text

5、从证书中提取私钥

openssl rsa -in server.pem -out serverprikey.pem

参考：http://blog.csdn.net/as3luyuan123/article/details/16811945