"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> OpenSSL alink="#0000FF"> cellspacing="0"> FreeBSD 使用手册 accesskey="P">Prev Chapter 10. 安全 accesskey="N">Next 10.9. OpenSSL As of FreeBSD 4.0, the OpenSSL toolkit is a part of the base system. href="http://www.openssl.org/" target="_top">OpenSSL provides a general-purpose cryptography library, as well as the Secure Sockets Layer v2/v3 (SSLv2/SSLv3) and Transport Layer Security v1 (TLSv1) network security protocols. However, one of the algorithms (specifically IDEA) included in OpenSSL is protected by patents in the USA and elsewhere, and is not available for unrestricted use. IDEA is included in the OpenSSL sources in FreeBSD, but it is not built by default. If you wish to use it, and you comply with the license terms, enable the class="MAKEVAR">MAKE_IDEA switch in /etc/make.conf and rebuild your sources using make world. Today, the RSA algorithm is free for use in USA and other countries. In the past it was protected by a patent. 10.9.1. Source Code Installations OpenSSL is part of the src-crypto and class="LITERAL">src-secure CVSup collections. See the href="mirrors.html">Obtaining FreeBSD section for more information about obtaining and updating FreeBSD source code. cellspacing="0"> accesskey="P">Prev accesskey="H">Home accesskey="N">Next Firewalls accesskey="U">Up VPN over IPsec
