自签名的证书比较适合于加密接口请求的访问，如果是web端https连接的话，最好是用公证机构提供的证书。
另外，自2017年1月1日起，苹果会强制ios应用使用https方式连接
生成自签名证书
脚本具体代码如下(有部分修改)：根据需求也可以自行修改脚本代码，比如有效时长等等
#!/bin/sh
# create self-signed server certificate:
read -p "Enter your domain [www.example.com]: " DOMAIN
echo "Create server key..."
openssl genrsa -des3 -out $DOMAIN.key 1024
echo "Create server certificate signing request..."
SUBJECT="/C=US/ST=Mars/L=iTranswarp/O=iTranswarp/OU=iTranswarp/CN=$DOMAIN"
openssl req -new -subj $SUBJECT -key $DOMAIN.key -out $DOMAIN.csr
echo "Remove password..."
mv $DOMAIN.key $DOMAIN.origin.key
openssl rsa -in $DOMAIN.origin.key -out $DOMAIN.key
echo "Sign SSL certificate..."
openssl x509 -req -days 3650 -in $DOMAIN.csr -signkey $DOMAIN.key -out $DOMAIN.crt
echo "TODO:"
echo "Copy $DOMAIN.crt to /etc/nginx/ssl/$DOMAIN.crt"
echo "Copy $DOMAIN.key to /etc/nginx/ssl/$DOMAIN.key"
echo "Add configuration in nginx:"
echo "server {"
echo " listen 443 ssl"
echo " ..."
echo " ssl on;"
echo " ssl_certificate /etc/nginx/ssl/$DOMAIN.crt;"
echo " ssl_certificate_key /etc/nginx/ssl/$DOMAIN.key;"
echo " ssl_protocols TLSv1 TLSv1.1 TLSv1.2"
echo " ssl_ciphers HIGH:!aNULL:!MD5"
echo "}"生成证书操作
$ sh ./gencert.sh
# 根据提示输入域名以及四次口令，注意这四次口令输入的都是一样的且同时包含字母和数字
nginx 配置
执行上面的脚本后，会在脚本所在目录生成证书
# 复制证书至/etc/nginx/ssl目录
cp www.test.com.crt /etc/nginx/ssl/www.test.com.crt
cp www.test.com.key /etc/nginx/ssl/www.test.com.key
# 修改nginx的server配置
server {
#监听80端口，强制转到443端口，进行https访问
listen 80;
server_name test.cn;
rewrite ^(.*)$ https://$host$1 permanent;
}
server {
listen 443 ssl;
#强制使用https访问
add_header Strict-Transport-Security "max-age=31536000; includeSubDomains;preload" always;
...# 此处省略其它配置内容
ssl on;
ssl_certificate /etc/nginx/ssl/www.test.com.crt; #证书格式有多种，常见的有pem、cer等
ssl_certificate_key /etc/nginx/ssl/www.test.com.key;
ssl_session_timeout 5m;
ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE:ECDH:AES:HIGH:!NULL:!aNULL:!MD5:!ADH:!RC4;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
}
# 重启nginx
service nginx restart最后一定要去阿里云的安全组开放443端口，操作和开放80端口方法是一样的。?
