linux系统生成公私钥对方法：
openssl genrsa -out rsa_private_key.pem 1024
openssl pkcs8 -topk8 -inform pem -in rsa_private_key.pem -outform pem -nocrypt -out private_key.pem
openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem
第一条命令生成原始 rsa私钥文件 rsa_private_key.pem，第二条命令将原始 rsa私钥转换为 pkcs8格式，第三条生成rsa公钥 rsa_public_key.pem
下面是代码：
公钥加密私钥解密
$source='abcde'; $pkeyid=file_get_contents(dir_base.'/rsa_key/rsa_public_key.pem', 'r'); $res = openssl_get_publickey($pkeyid); openssl_public_encrypt($source,$crypttext,$res); echo $crypttext; $pkeyid=file_get_contents(dir_base.'/rsa_key/rsa_private_key.pem', 'r'); $res2 = openssl_get_privatekey($pkeyid); if(openssl_private_decrypt($crypttext,$data,$res2)){ echo $data; }else{ echo false; }
私钥加密公钥解密
$source='abcde'; $pkeyid=file_get_contents(dir_base.'/rsa_key/rsa_private_key.pem', 'r'); $res = openssl_get_privatekey($pkeyid); openssl_private_encrypt($source,$crypttext,$res); echo $crypttext; $pkeyid=file_get_contents(dir_base.'/rsa_key/rsa_public_key.pem', 'r'); $res2 = openssl_get_publickey($pkeyid); if(openssl_public_decrypt($crypttext,$data,$res2)){ echo $data; }else{ echo false; }