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Primary Newsgroup: mozilla.dev.tech.crypto
Alternate Newsgroup: mozilla.dev.tech.crypto

Network Security Services (NSS) is a set of libraries designed to supportcross-platform development of security-enabled client and server applications. Applicationsbuilt with NSS can supportSSLv2 and v3, TLS,PKCS#5, PKCS #7,PKCS#11, PKCS #12, S/MIME,X.509v3 certificates, and other security standards. For detailed informationon standards supported, see Overview of NSS.

NSS is available under the Mozilla Public License, the GNU General PublicLicense, and the GNU Lesser General Public License. For information ondownloading NSS releases as tar files, see Download PKI Source.

To participate in ongoing technical discussions related to NSS, tunein to the newsgroup using one of the above links.

In this document

Project Information

NSS 3.11.4 has been released. We are working on NSS 3.12.

Nss

17 November 2006: NSS 3.11.4 Release

NSS 3.11.4 is the version that we submitted to NIST for FIPS 140-2 validation.The CVS tag is NSS_3_11_4_RTM. NSS 3.11.4 may be used with NSPR 4.6.4 (CVS tagNSPR_4_6_4_RTM) or later.

NSS 3.11.4 is a patch release for NSS 3.11. For the list of the bugs thathave been fixed in NSS 3.11.4, seeNSS 3.11.4 Release Notes.

19 May 2005: NSS 3.10 Release

NSS 3.10 was completed on 27 April 2005. The CVS tag is NSS_3_10_RTM. It isthe first release in which the DBM library (mozilla/dbm andmozilla/security/dbm) became part of the NSS source tree. NSS 3.10 may beused with NSPR 4.5.1 (CVS tag NSPR_4_5_1_RTM) or later. We will post therelease notes here soon.

19 May 2005: NSS 3.9.5 Release

NSS 3.9.5 is the latest patch release for NSS 3.9. The CVS tag isNSS_3_9_5_RTM.

8 January 2004: NSS 3.9 Release

The new features and enhancements in NSS 3.9 include GeneralizedTimesupport, RFC 3280 compliant name constraints, and the ability to listduplicate certificate instances in multiple tokens. NSS 3.9 passesall the NISCCSSL/TLSand S/MIMEtests (1.6 million test cases of invalid input data) without crashesor memory leaks. We recommend that all NSS customers upgrade to NSS3.9 in the next release of your product. For details, seeNSS 3.9 Release Notes.

20 June 2003: NSS 3.7.7 Release

NSS 3.7.7 is a patch release for NSS 3.7. For the list of the bugs thathave been fixed in NSS 3.7.7, see NSS 3.7.7 Release Notes.

21 May 2003: NSS 3.7.5 Release

NSS 3.7.5 is a patch release for NSS 3.7. For the list of the bugs thathave been fixed in NSS 3.7.5, seeNSS 3.7.5 Release Notes.

10 April 2003: NSS 3.8 Release

The new features and enhancements in NSS 3.8 include the SHA-256, SHA-384,and SHA-512 algorithms, enhanced smartcard support, and the elliptic curvecryptography code (not compiled by default) contributed by Sun Labs. Fordetails, see NSS 3.8 Release Notes.

20 March 2003: NSS 3.7.3 Release

NSS 3.7.3 is a patch release for NSS 3.7. For the list of the bugs thathave been fixed in NSS 3.7.3, see NSS 3.7.3 Release Notes.

10 March 2003: NSS 3.7.2 Release

NSS 3.7.2 is a patch release for NSS 3.7. For the list of the bugs thathave been fixed in NSS 3.7.2, seeNSS 3.7.2 Release Notes.

4 March 2003: NSS 3.4.3 Release

NSS 3.4.3 is a patch release for NSS 3.4. For the list of the bugs thathave been fixed in NSS 3.4.3, seeNSS 3.4.3 Release Notes.

27 Febrary 2003: Security Vulnerability: Vaudenay Timing Attack on CBC mode blockciphers

Recently a timing-based attack on SSL/TLS implementations of CBC mode blockcipher suites was disclosed. At present the implementation of SSL and TLS in NSS issusceptible to this method. The flaw is exploited on the recipient ofsensitive data, which is normally servers. Servers are vulnerable tothe attack only if they implement all of the following:

  • TLS (supported by NSS 2.8 and later);
  • cipher suites that use block ciphers;
  • application protocols that are likely to receive sensitive data (forexample, passwords) at exactly the same offset in many messages froma client.

We have implemented a countermeasure and will release NSS patch releasessoon. Until updated NSS libraries are available, we recommend the followingaction:

  • Netscape/mozilla browser users do not need to take any action. Theycould choose to disable TLS or disable CBC mode block ciphersuitesas a precaution against vulnerable servers.
  • Administrators of servers that are based on NSS 2.8 or later and thatenable TLS need to take action. They could disable TLS or disable CBCmode block cipher suites.

For more information, please see our article on this security flaw.

29 January 2003: NSS 3.7.1 Release

NSS 3.7.1 is a patch release for NSS 3.7. For the list of the bugs thathave been fixed in NSS 3.7.1, seeNSS 3.7.1 Release Notes.

20 December 2002: NSS 3.7 Release

The new features and enhancements in NSS 3.7 include a new version of theNSS certificate database that supports large CRLs and multiple emailaddresses for the subject of a certificate. For details, seeNSS 3.7 Release Notes.

4 December 2002: NSS 3.6.1 Release

NSS 3.6.1 is a patch release for NSS 3.6. For the list of the bugs thathave been fixed in NSS 3.6.1, seeNSS 3.6.1 Release Notes.

18 October 2002: NSS 3.6 Release

The new features and enhancements in NSS 3.6 include new certificate handlingand SSL functions, better certificate path construction, significantlyimproved CRL performance and memory usage, better SSL client authenticationperformance, and PKCS #11 session logging. For details, seeNSS 3.6 Release Notes.

July 2002: NSS 3.5 Release

NSS 3.5 is an interim release created for Mozilla 1.0.1 and Netscape 7.We recommend that other NSS clients upgrade to NSS 3.6.

10 June 2002: NSS 3.4.2 Release

NSS 3.4.2 is a patch release for NSS 3.4. For the list of the bugs thathave been fixed in NSS 3.4.2, seeNSS 3.4.2 Release Notes.

6 May 2002: NSS 3.4.1 Release

NSS 3.4.1 is a patch release for NSS 3.4. For the list of the bugs thathave been fixed in NSS 3.4.1, seeNSS 3.4.1 Release Notes.

6 May 2002: NSS 3.4 Release

NSS 3.4 contains a partial implementation of the core NSS 4.0 (code name Stan)functions and supports the new TLS AES ciphersuites. For details, seeNSS 3.4 Release Notes.

12 December 2001: NSS 3.3.2 Release

NSS 3.3.2 is a patch release for NSS 3.3. For the list of the bugsthat have been fixed in NSS 3.3.2, see NSS3.3.2 Release Notes.

9 November 2001: NSS 3.3.1 Release

NSS 3.3.1 is a patch release for NSS 3.3. For the list of the bugsthat have been fixed in NSS 3.3.1, see NSS3.3.1 Release Notes.

Nss

26 July 2001: NSS 3.3 Release

NSS 3.3 enables JSS (3.1 or newer) to use NSS shared libraries and implementsfive new DHE cipher suites for SSL/TLS on the client side. For details,see NSS 3.3 Release Notes.

Source code for a Java interface to NSS is available in the MozillaCVS tree. For details, see Network Security Servicesfor Java.

NSS 3.3 source is available via CVS and maybe viewed in HMTL (via the LXR tool) at http://lxr.mozilla.org/mozilla/source/security/nss/.

6 April 2001: NSS 3.2.1 Release

NSS 3.2.1 provides improved SSL performance and fixes bugs in pk12utiland some certificate query operations. For details, see NSS3.2.1 Release Notes.

NSS 3.2.1 also facilitates simplified build instructions. For details,see Build Instructions for NSS 3.2.1 Release.For background information on the build system and proposals for futurechanges, see The NSS Build System: Historyand Future Directions.

2 March 2001: NSS 3.2 Release

NSS 3.2 provided support for shared libraries for the first time. For details,see NSS 3.2 Release Notes.

Applications that use only the NSS 3.2Public Functions exported by the NSS 3.2 DLLs are guaranteed to workwith future versions of the shared libraries.

S/MIME Toolkit Module

See S/MIME Toolkit for information about NSS librariesdesigned to support cross-platform development of S/MIME applications.Originally created to support S/MIME in Communicator 4.x and Personal SecurityManager (PSM), these libraries form the basis of a new S/MIME Toolkit forcross-platform development of S/MIME applications.

SSL/TLS Module

See SSL/TLS for information about NSS libraries designedto support cross-platform development of SSL- and TLS-enabled applications.These libraries form the basis of the SSL module.

Documentation

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Background information:

  • Overview of NSS. Provides a brief summary ofNSS and its capabilities.
  • NSS FAQ. Answers basic questions about NSS.
  • Introduction to Public-Key Cryptography. Explains the basic concepts of public-keycryptography that underlie NSS.
  • Introduction to SSL. Introduces the SSL protocol, including information about cryptographicciphers supported by SSL and the steps involved in the SSL handshake.

History:

  • History of NSS. A brief history of NSS.
  • NSS Project Plans. Links to project plans forNSS 3.0 and later releases.
  • NSS Release Notes. Links to release notesfor NSS 3.0 and later releases.
  • NSS Contributors lists major contributorsto the NSS project.

NSS APIs:

  • Introduction to Network Security Services. Providesan overview of the NSS 3.2 libraries and what you need to know to use them.
  • NSS Public Functionssummarizes the APIs exported by the NSS shared libraries. These APIs areguaranteed to work with future versions of NSS shared libraries.
  • SSL Reference. API used to invoke SSL operations.
  • NSS API Guidelines. Explains how thelibraries and code are organized, and guidelines for developing code (namingconventions, error handling, thread safety, etc.)
  • NSS Technical Notes. Links to NSS technical notes,which provide latest information about new NSS features and supplementarydocumentation for advanced topics in programming with NSS.

Tools, testing, and other technical details:

  • Build Instructions for NSS (see NSS release notesfor links). Describe how to check out and build NSS releases.
  • NSS Tools. Tools for developing, debugging, and managingapplications that use NSS.
  • NSS 3.2 Test Suite. Describes how to runthe standard NSS tests.
  • NSS Performance Reports. Links toperformance reports for NSS 3.2 and later releases.
  • Encryption Technologies Available in NSS 3.11lists the cryptographic algorithms used by NSS 3.11.
  • NSS 3.1 Loadable Root Certificates. Describesthe new scheme for loading root CA certificates.
  • cert7.db. General format of the cert7.db database.
  • Content Version Numbers in the Certificate Database.Information about content version numbers in cert7.db.

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PKCS #11 information for implementors of cryptographic modules:

CA certificates pre-loaded into NSS

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NSS is built on top of Netscape Portable Runtime (NSPR); developers usingNSS must call some NSPR functions. For information on NSPR, see the following:

  • Netscape Portable Runtime. NSPR project page.
  • NSPR Reference. NSPR API documentation.

Mozilla CVS Information

The CVS tags for various NSS releases can be found in theNSS release notes.

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NSS source code is in the mozilla/security/coreconf/ andmozilla/security/nss/ directories.