curl+openssl 踩坑笔记

curl编译：点击跳转

 踩坑一

* SSL certificate problem: unable to get local issuer certificate
* closing connection #0
curl: (60) SSL certificate problem: unable to get local issuer certificate
More details here: https://curl.se/docs/sslcerts.html

解决方法1：添加证书

https://curl.haxx.se/ca/cacert.pem //下载证书

export CURL_CA_BUNDLE=/gui/cacert.pem //设置环境变量

解决方法2：忽略 SSL 验证

./curl -k https://www.baidu.com

curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);

 踩坑二

routines:tls_process_key_exchange:wrong signature length

原因：编译的openssl库是64位，设备是32位，导致编译后的libcrypto.so不对，报签名长度出错。解决办法，编译之前加上 setarch i386。

setarch i386 ./config no-asm shared no-async --prefix=$PWD/build --cross-compile-prefix=arm-linux-

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