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<title>i5/OS Global Secure Toolkit (GSKit) APIs</title>
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<h2>i5/OS Global Secure Toolkit (GSKit) APIs</h2>
<p>i5/OS<SUP>(TM)</SUP> GSkit APIs, when used in addition to the existing i5/OS Sockets
APIs, provide the functions required for applications to establish secure
communications. An application using GSKit
for secure communications
basically is a client/server application written using sockets.</p>
<p>The Global Secure Toolkit (GSKit) APIs are:</p>
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<ul>
<li><A HREF="gsk_attribute_get_buffer.htm">gsk_attribute_get_buffer()</A> (Get character information about a secure session or an SSL environment) is used to obtain specific character string information about a secure session or an SSL environment.</li>
<li><A HREF="gsk_attribute_get_cert_info.htm">gsk_attribute_get_cert_info()</A> (Get information about a local or partner certificate) is used to obtain specific information about either the server or client certificate for a secure session or an SSL environment.</li>
<li><A HREF="gsk_attribute_get_enum.htm">gsk_attribute_get_enum()</A> (Get enumerated information for a secure session or an SSL environment) is used to obtain values for specific enumerated data for a secure session or an SSL environment.</li>
<li><A HREF="gsk_attribute_get_numeric_value.htm">gsk_attribute_get_numeric_value()</A> (Get numeric information about a secure session or an SSL environment) is used to obtain specific numeric information about a secure session or an SSL environment.</li>
<li><A HREF="gsk_attribute_set_buffer.htm">gsk_attribute_set_buffer()</A> (Set character information for a secure session or an SSL environment) is used to set a specified buffer attribute to a value inside the specified secure session or SSL environment.</li>
<li><A HREF="gsk_attribute_set_callback.htm">gsk_attribute_set_callback()</A> (Set callback pointers to routines in the user application) is used to set callback callback pointers to routines in the user application.</li>
<li><A HREF="gsk_attribute_set_enum.htm">gsk_attribute_set_enum()</A> (Set enumerated information for a secure session or an SSL environment) is used to set a specified enumerated type attribute to an enumerated value in the secure session or SSL environment.</li>
<li><A HREF="gsk_attribute_set_numeric_value.htm">gsk_attribute_set_numeric_value()</A> (Set numeric information for a secure session or an SSL environment) is used to set specific numeric information for a secure session or an SSL environment.</li>
<li><A HREF="gsk_environment_close.htm">gsk_environment_close()</A> (Close an SSL environment) is used to close the SSL environment and release all storage associated with the environment.</li>
<li><A HREF="gsk_environment_init.htm">gsk_environment_init()</A> (Initialize an SSL environment) is used to initialize the SSL environment after any required attributes are set.</li>
<li><A HREF="gsk_environment_open.htm">gsk_environment_open()</A> (Get a handle for an SSL environment) is used to get storage for the SSL environment.</li>
<li><A HREF="gsk_secure_soc_close.htm">gsk_secure_soc_close()</A> (Close a secure session) is used to close a secure session and free all the associated resources for that secure session.</li>
<li><A HREF="gsk_secure_soc_init.htm">gsk_secure_soc_init()</A> (Negotiate a secure session) is used to negotiate a secure session, using the attributes set for the SSL environment and the secure session.</li>
<li><A HREF="gsk_secure_soc_misc.htm">gsk_secure_soc_misc()</A> (Perform miscellaneous functions for a secure session) is used to perform miscellaneous functions for a secure session.</li>
<li><A HREF="gsk_secure_soc_open.htm">gsk_secure_soc_open()</A> (Get a handle for a secure session) is used to get storage for a secure session, set default values for attributes, and return a handle that must be saved and used on secure session-related function calls.</li>
<li><A HREF="gsk_secure_soc_read.htm">gsk_secure_soc_read()</A> (Receive data on a secure session) is used by a program to receive data from a secure session.</li>
<li><A HREF="gskstartinit.htm">gsk_secure_soc_startInit()</A> (Start asynchronous operation to negotiate a secure session) initiates an asynchronous negotiation of a secure session, using the attributes set for the SSL environment and the secure session.</li>
<li><A HREF="gskstartrecv.htm">gsk_secure_soc_startRecv()</A> (Start asynchronous receive operation on a secure session) is used to initiate an asynchronous receive operation on a secure session.</li>
<li><A HREF="gskstartsend.htm">gsk_secure_soc_startSend()</A> (Start asynchronous send operation on a secure session) is used to initiate an asynchronous send operation on a secure session.</li>
<li><A HREF="gsk_secure_soc_write.htm">gsk_secure_soc_write()</A> (Send data on a secure session) is used by a program to write data on a secure session.</li>
<li><A HREF="gsk_strerror.htm">gsk_strerror()</A> (Retrieve GSKit runtime error message) is used to retrieve an error message and associated text string that describes a return value that was returned from calling a GSKit API.</li>
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<p><strong>Note:</strong> These functions use header (include) files from the
library QSYSINC, which is optionally installable. Make sure QSYSINC is
installed on your system before using any of the functions. See <a href=
"unix13.htm">Header Files for UNIX-Type Functions</a> for the file and member
name of each header file.</p>
<p>See the following examples in the Socket programming topic for more information:</p>
<ul>
<li><a href="../rzab6/xgskserver.htm">Example: GSKit secure server
with asynchronous data receive</a></li>
<li><a href="../rzab6/xgskasynch.htm">Example: GSKit secure server
with asynchronous handshake</a></li>
<li><a href="../rzab6/xgskclient.htm">Example: Establish a secure
client with GSKit APIs</a></li>
</ul>
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