openssl命令行：RSA的用法-- 终极版

1、生成密钥
openssl genrsa -out test2048_priv.pem 2048
openssl rsa -pubout -in test2048_priv.pem -out test2048_pub.pem

openssl genrsa -out test3072_priv.pem 3072
openssl rsa -pubout -in test3072_priv.pem -out test3072_pub.pem

openssl genrsa -out test4096_priv.pem 4096
openssl rsa -pubout -in test4096_priv.pem -out test4096_pub.pem

2、查看密钥
openssl rsa -in test2048_priv.pem -text -out
openssl rsa -in test3072_priv.pem -text -out
openssl rsa -in test4096_priv.pem -text -out

3、基于 PKCS1v1.5 Pending的 签名、验签、加密、解密

(1) 签名和验签

• openssl dgst -sign test2048_priv.pem -sha256 -out sign.txt in.txt
• openssl dgst -verify test2048_pub.pem -sha256 -signature sign.txt in.txt

（2）加密