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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-26952] Cache SCRAM-SHA-1 ClientKey</title>
                <link>https://jira.mongodb.org/browse/SERVER-26952</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;SCRAM-SHA-1, by design, consumes a great deal of CPU resources while performing authentication. This can be a problem while populating connection pools, where many clients are authenticating at once. Fortunately, most of the expensive computations of SCRAM can be reused across multiple authentication requests. RFC5802 &lt;a href=&quot;https://tools.ietf.org/html/rfc5802#section-5.1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;makes provisions for this&lt;/a&gt;:&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;Note  that a client implementation MAY cache ClientKey&amp;amp;ServerKey (or just SaltedPassword) for later reauthentication to the same service, as it is likely that the server is going to advertise the same salt value upon reauthentication.  This might be useful for mobile clients where CPU usage is a concern.&lt;/p&gt;&lt;/blockquote&gt;</description>
                <environment></environment>
        <key id="330481">SERVER-26952</key>
            <summary>Cache SCRAM-SHA-1 ClientKey</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="spencer.jackson@mongodb.com">Spencer Jackson</assignee>
                                    <reporter username="spencer.jackson@mongodb.com">Spencer Jackson</reporter>
                        <labels>
                            <label>bkp</label>
                    </labels>
                <created>Tue, 8 Nov 2016 17:22:18 +0000</created>
                <updated>Tue, 17 Oct 2017 13:29:38 +0000</updated>
                            <resolved>Thu, 2 Feb 2017 23:19:48 +0000</resolved>
                                                    <fixVersion>3.2.16</fixVersion>
                    <fixVersion>3.4.4</fixVersion>
                    <fixVersion>3.5.3</fixVersion>
                                    <component>Internal Client</component>
                                        <votes>0</votes>
                                    <watches>15</watches>
                                                                                                                <comments>
                            <comment id="1619433" author="xgen-internal-githook" created="Tue, 11 Jul 2017 23:02:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;spencerjackson&apos;, u&apos;name&apos;: u&apos;Spencer Jackson&apos;, u&apos;email&apos;: u&apos;spencer.jackson@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26952&quot; title=&quot;Cache SCRAM-SHA-1 ClientKey&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26952&quot;&gt;&lt;del&gt;SERVER-26952&lt;/del&gt;&lt;/a&gt;: Cache SCRAM-SHA-1 ClientKey&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 47da0b53f9cd27aeec1d2822780784866269a47d)&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/16e83332ed20e4054324a1a7714506e74eed5180&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/16e83332ed20e4054324a1a7714506e74eed5180&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1543593" author="xgen-internal-githook" created="Fri, 7 Apr 2017 14:37:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;spencerjackson&apos;, u&apos;name&apos;: u&apos;Spencer Jackson&apos;, u&apos;email&apos;: u&apos;spencer.jackson@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26952&quot; title=&quot;Cache SCRAM-SHA-1 ClientKey&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26952&quot;&gt;&lt;del&gt;SERVER-26952&lt;/del&gt;&lt;/a&gt;: Cache SCRAM-SHA-1 ClientKey&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 47da0b53f9cd27aeec1d2822780784866269a47d)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c53363894310c144aefd06ce323d348735789601&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c53363894310c144aefd06ce323d348735789601&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1491360" author="xgen-internal-githook" created="Thu, 2 Feb 2017 23:13:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;spencerjackson&apos;, u&apos;name&apos;: u&apos;Spencer Jackson&apos;, u&apos;email&apos;: u&apos;spencer.jackson@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26952&quot; title=&quot;Cache SCRAM-SHA-1 ClientKey&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26952&quot;&gt;&lt;del&gt;SERVER-26952&lt;/del&gt;&lt;/a&gt;: Cache SCRAM-SHA-1 ClientKey&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/47da0b53f9cd27aeec1d2822780784866269a47d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/47da0b53f9cd27aeec1d2822780784866269a47d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1453557" author="david.golden" created="Fri, 9 Dec 2016 02:40:09 +0000"  >&lt;p&gt;N.B. SaltedPassword and thus ClientKey and ServerKey are a function of &lt;b&gt;both&lt;/b&gt; salt and iteration count, so the cache would be invalid if either change (which is fortunately also unlikely in the timeframe of multiple server connections in a pool).&lt;/p&gt;</comment>
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