Openssl

The OpenSSL software - a robust, commercial-grade, full-featured toolkit for general-purpose cryptography and secure communication.

ubuntu 20.04 自带 openssl，但无相应的 .h 及 .so .a

openssl
OpenSSL> version
OpenSSL 1.1.1f  31 Mar 2020

可通过安装 libssl-dev 解决

apt install libssl-dev
需要高版本的 openssl 报如下错误
error while loading shared libraries: libcrypto.so.3

# 删除，可选操作
apt remove openssl libssl-dev
# 以下目录及文件需手工删除
/bin/openssl
/bin/c_rehash
/lib/ssl
/usr/lib/ssl

安装 openssl 3

apt install build-essential checkinstall zlib1g-dev -y

wget https://www.openssl.org/source/openssl-3.0.8.tar.gz

./config --prefix=/usr/local/openssl --openssldir=/usr/local/openssl shared zlib
make -j4
make install_sw

# /etc/ld.so.conf
# add /usr/local/openssl/lib64
# ldconfig

# 配置路径
export PATH=/usr/local/openssl/bin:$PATH
export LD_LIBRARY_PATH=/usr/local/openssl/lib64:$LD_LIBRARY_PATH

openssl version -a

zlib or zlib-dynamic

./config ... shared zlib
./config ... shared zlib-dynamic

设置 openssl 编译时使用哪个方式(静态库、动态库)来获取 zlib 依赖。