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本文链接：https://blog.youkuaiyun.com/gx_1983/article/details/47960593

本文介绍了如何在SSL库中初始化并注册可用的加密算法和校验算法，提供了典型TLS/SSL应用程序的初始化流程和注意事项。

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http://www.openssl.org/docs/manmaster/ssl/OpenSSL_add_ssl_algorithms.html

SSL_library_init

NAME

SSL_library_init, OpenSSL_add_ssl_algorithms, SSLeay_add_ssl_algorithms - initialize SSL library by registering algorithms

SYNOPSIS

 #include <openssl/ssl.h>

 int SSL_library_init(void);
 #define OpenSSL_add_ssl_algorithms()    SSL_library_init()

 #define SSLeay_add_ssl_algorithms()     SSL_library_init()  （三个函数都是一样的定义。）

DESCRIPTION

SSL_library_init() registers the available SSL/TLS ciphers and digests.

OpenSSL_add_ssl_algorithms() and SSLeay_add_ssl_algorithms() are synonyms for SSL_library_init().

NOTES

SSL_library_init() must be called before any other action takes place. SSL_library_init() is not reentrant.

WARNING

SSL_library_init() adds ciphers and digests used directly and indirectly by SSL/TLS.

EXAMPLES

A typical TLS/SSL application will start with the library initialization, and provide readable error messages.

 SSL_load_error_strings();                /* readable error messages */
 SSL_library_init();                      /* initialize library */

RETURN VALUES

SSL_library_init() always returns "1", so it is safe to discard the return value.

NOTES

OpenSSL 0.9.8o and 1.0.0a and later added SHA2 algorithms to SSL_library_init(). Applications which need to use SHA2 in earlier versions of OpenSSL should call OpenSSL_add_all_algorithms() as well.