linuxqtssl,【Qt】Qt中使用ssl时报错：qt.network.ssl:QSslSocket:cannotresolveSSLv2_client_method...

一、问题

在Qt中使用https&＃xff0c;运行时报错&＃xff1a;

qt.network.ssl: QSslSocket: cannot resolve SSLv2_client_method

二、原因分析

SSLv2由于某些漏洞导致的不安全原因&＃xff0c; 在某些linux发行版里的openssl库禁用掉了SSLv2

三、解决办法

重新编译openssl

1、下载openssl

git clone https://github.com/openssl/openssl.git

2、编译

./config enable-shared

make -j4

3、部署

将ssl和crypto库拷贝到Qt目录lib下&＃xff1a;

cp libssl.so* libcrypto.so* ~/Qt5.6.3/5.6.3/gcc_64/lib/ -a

4、新的错误

重新运行时&＃xff0c;报错

qt.network.ssl: QSslSocket: cannot call unresolved function *

qt.network.ssl: QSslSocket: cannot resolve CRYPTO_num_locks

qt.network.ssl: QSslSocket: cannot resolve CRYPTO_set_id_callback

qt.network.ssl: QSslSocket: cannot resolve CRYPTO_set_locking_callback

qt.network.ssl: QSslSocket: cannot resolve ERR_free_strings

qt.network.ssl: QSslSocket: cannot resolve EVP_CIPHER_CTX_cleanup

qt.network.ssl: QSslSocket: cannot resolve EVP_CIPHER_CTX_init

qt.network.ssl: QSslSocket: cannot resolve sk_new_null

qt.network.ssl: QSslSocket: cannot resolve sk_push

qt.network.ssl: QSslSocket: cannot resolve sk_free

qt.network.ssl: QSslSocket: cannot resolve sk_num

qt.network.ssl: QSslSocket: cannot resolve sk_pop_free

qt.network.ssl: QSslSocket: cannot resolve sk_value

qt.network.ssl: QSslSocket: cannot resolve SSL_library_init

qt.network.ssl: QSslSocket: cannot resolve SSL_load_error_strings

qt.network.ssl: QSslSocket: cannot resolve SSL_get_ex_new_index

qt.network.ssl: QSslSocket: cannot resolve SSLv2_client_method

qt.network.ssl: QSslSocket: cannot resolve SSLv3_client_method

qt.network.ssl: QSslSocket: cannot resolve SSLv23_client_method

qt.network.ssl: QSslSocket: cannot resolve SSLv2_server_method

qt.network.ssl: QSslSocket: cannot resolve SSLv3_server_method

qt.network.ssl: QSslSocket: cannot resolve SSLv23_server_method

qt.network.ssl: QSslSocket: cannot resolve X509_STORE_CTX_get_chain

qt.network.ssl: QSslSocket: cannot resolve OPENSSL_add_all_algorithms_noconf

qt.network.ssl: QSslSocket: cannot resolve OPENSSL_add_all_algorithms_conf

qt.network.ssl: QSslSocket: cannot resolve SSLeay

qt.network.ssl: QSslSocket: cannot resolve SSLeay_version

qt.network.ssl: QSslSocket: cannot call unresolved function CRYPTO_num_locks

qt.network.ssl: QSslSocket: cannot call unresolved function CRYPTO_set_id_callback

qt.network.ssl: QSslSocket: cannot call unresolved function CRYPTO_set_locking_callback

qt.network.ssl: QSslSocket: cannot call unresolved function SSL_library_init

qt.network.ssl: QSslSocket: cannot call unresolved function SSLv23_client_method

qt.network.ssl: QSslSocket: cannot call unresolved function sk_num

qt.network.ssl: QSslSocket: cannot call unresolved function SSLeay

qt.network.ssl: QSslSocket: cannot call unresolved function SSLeay

qt.network.ssl: QSslSocket: cannot call unresolved function SSLeay

qt.network.ssl: QSslSocket: cannot call unresolved function SSLeay

四、解决新错误

参考博客&＃xff1a;https://www.cnblogs.com/btian/p/6130560.html

Qt5.6对openssl版本的要求1.0&＃xff0c;而从git上下载的最新版本是1.1的&＃xff1b;

其它Qt的版本对openssl的要求未测试。

1、查看版本信息

git branch -r

origin/HEAD -> origin/master

origin/OpenSSL-engine-0_9_6-stable

origin/OpenSSL-fips-0_9_7-stable

origin/OpenSSL-fips-0_9_8-stable

origin/OpenSSL-fips-1_2-stable

origin/OpenSSL-fips-2_0-dev

origin/OpenSSL-fips-2_0-stable

origin/OpenSSL-fips2-0_9_7-stable

origin/OpenSSL_0_9_6-stable

origin/OpenSSL_0_9_7-stable

origin/OpenSSL_0_9_8-stable

origin/OpenSSL_0_9_8fg-stable

origin/OpenSSL_1_0_0-stable

origin/OpenSSL_1_0_1-stable

origin/OpenSSL_1_0_2-stable

origin/OpenSSL_1_1_0-stable

origin/OpenSSL_1_1_1-stable

origin/SSLeay

origin/master

origin/tls1.3-draft-18

origin/tls1.3-draft-19

2、导出1.0.2版本

git checkout -b openssl-1.0.2 origin/OpenSSL_1_0_2-stable

3、编译

./config enable-shared

make -j4

4、部署

cp libssl.so* libcrypto.so* ~/Qt5.6.3/5.6.3/gcc_64/lib/ -a

重新运行不再报错