The SSH library (BSD license)
https://www.libssh2.org
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libssh2 - SSH2 library ====================== libssh2 is a library implementing the SSH2 protocol, available under the revised BSD license. Generic installation instructions are in INSTALL. Some ./configure options deserve additional comments: * --enable-crypt-none The SSH2 Transport allows for unencrypted data transmission using the "none" cipher. Because this is such a huge security hole, it is typically disabled on SSH2 implementations and is disabled in libssh2 by default as well. Enabling this option will allow for "none" as a negotiable method, however it still requires that the method be advertized by the remote end and that no more-preferable methods are available. * --enable-mac-none The SSH2 Transport also allows implementations to forego a message authentication code. While this is less of a security risk than using a "none" cipher, it is still not recommended as disabling MAC hashes removes a layer of security. Enabling this option will allow for "none" as a negotiable method, however it still requires that the method be advertized by the remote end and that no more-preferable methods are available. * --disable-gex-new The diffie-hellman-group-exchange-sha1 (dh-gex) key exchange method originally defined an exchange negotiation using packet type 30 to request a generation pair based on a single target value. Later refinement of dh-gex provided for range and target values. By default libssh2 will use the newer range method. If you experience trouble connecting to an old SSH server using dh-gex, try this option to fallback on the older more reliable method. * --with-libgcrypt * --with-libgcrypt-prefix=DIR libssh2 can use the Libgcrypt library (http://www.gnupg.org/) for cryptographic operations. Configure will attempt to locate Libgcrypt in the default location, but if you have installed it somewhere else, use the --with-libgrypt-prefix=DIR parameter. * --with-openssl=[DIR] libssh2 can use the OpenSSL library (http://www.openssl.org) for cryptographic operations. Configure will attempt to locate OpenSSL in a number of default locations: /usr/local/ssl /usr/local /usr /usr/local/openssl If your installation of OpenSSL is in another location, specify it here. * --with-libz=[DIR] If present, libssh2 will attempt to use the zlib (http://www.zlib.org) for payload compression, however zlib is not required. Configure will attempt to location a zlib installation in a number of default locations: /usr/local /usr /usr/local/libz /usr/libz /usr/local/zlib /usr/zlib If your installation of zlib is in another location, you may specify it here. * --enable-debug Will make the build use more pedantic and strict compiler options as well as enable the libssh2_trace() function (for showing debug traces).