安装openssl工具
找到一个指定的目录并下载openssl
wget http://www.openssl.org/source/openssl-1.0.2f.tar.gz
tar -xzf openssl-1.0.2f.tar.gz
cd openssl-1.0.2f
./config --prefix=/usr/local/openssl/
make
make install
检查openssl是否安装成功
openssl version
已经装好openssl环境了；
1.pkcs8私钥 转pkcs1 私钥
openssl rsa -in demo_pkcs8.pem -out demo_pkcs1.pem
2.PKCS1 私钥转换为 PKCS8 私钥
openssl pkcs8 -topk8 -inform PEM -in demo_private.pem -outform pem -nocrypt -out demo_pkcs8.pem
3.从 pkcs1 私钥中生成 pkcs8 公钥
openssl rsa -in demo_private.pem -pubout -out demo_public.pem
4.从 pkcs8 私钥中生成 pkcs8 公钥
openssl rsa -in demo_pkcs8.pem -pubout -out demo_public_pkcs8.pem
5.kcs8 公钥转 pkcs1公钥
openssl rsa -pubin -in demo_public.pem -RSAPublicKey_out
6.pkcs1公钥转换为pkcs8公钥
openssl rsa -RSAPublicKey_in -in pub_pkcs1.pem -pubout
