diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
index 485b541..c580443 100644
--- a/.github/pull_request_template.md
+++ b/.github/pull_request_template.md
@@ -1,8 +1,5 @@
 Notes:
-* Pull requests cannot be accepted until:
--  The submitter has [accepted the online agreement here with a click through](https://developer.mbed.org/contributor_agreement/) 
-   or for companies or those that do not wish to create an mbed account, a slightly different agreement can be found [here](https://www.mbed.com/en/about-mbed/contributor-license-agreements/)
-- The PR follows the [mbed TLS coding standards](https://tls.mbed.org/kb/development/mbedtls-coding-standards)
+* Pull requests cannot be accepted until the PR follows the [contributing guidelines](../CONTRIBUTING.md). In particular, each commit must have at least one `Signed-off-by:` line from the committer to certify that the contribution is made under the terms of the [Developer Certificate of Origin](../dco.txt).
 * This is just a template, so feel free to use/remove the unnecessary things
 ## Description
 A few sentences describing the overall goals of the pull request's commits.
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 18851db..c1ae452 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -5,11 +5,6 @@
  - As with any open source project, contributions will be reviewed by the project team and community and may need some modifications to be accepted.
  - The contribution should not break API or ABI, unless there is a real justification for that. If there is an API change, the contribution, if accepted, will be merged only when there will be a major release.
 
-Contributor License Agreement (CLA)
------------------------------------
-- All contributions, whether large or small, require a Contributor's License Agreement (CLA) to be accepted. This is because source code can possibly fall under copyright law and we need your consent to share in the ownership of the copyright.
-- To accept the Contributor’s License Agreement (CLA), individual contributors can do this by creating an Mbed account and [accepting the online agreement here with a click through](https://developer.mbed.org/contributor_agreement/). Alternatively, for contributions from corporations, or those that do not wish to create an Mbed account, a slightly different agreement can be found [here](https://www.mbed.com/en/about-mbed/contributor-license-agreements/). This agreement should be signed and returned to Arm as described in the instructions given.
-
 Coding Standards
 ----------------
 - We would ask that contributions conform to [our coding standards](https://tls.mbed.org/kb/development/mbedtls-coding-standards), and that contributions are fully tested before submission, as mentioned in the [Tests](#tests) and [Continuous Integration](#continuous-integration-tests) sections.
@@ -24,7 +19,8 @@
 1. Write a test which shows that the bug was fixed or that the feature works as expected.
 1. Send a pull request (PR) and work with us until it gets merged and published. Contributions may need some modifications, so a few rounds of review and fixing may be necessary. We will include your name in the ChangeLog :)
 1. For quick merging, the contribution should be short, and concentrated on a single feature or topic. The larger the contribution is, the longer it would take to review it and merge it.
-1. Mbed TLS is released under the Apache license, and as such, all the added files should include the Apache license header.
+1. All new files should include the [Apache-2.0](https://spdx.org/licenses/Apache-2.0.html) standard license header where possible.
+1. Ensure that each commit has at least one `Signed-off-by:` line from the committer. If anyone else contributes to the commit, they should also add their own `Signed-off-by:` line. By adding this line, contributor(s) certify that the contribution is made under the terms of the [Developer Certificate of Origin](dco.txt). The contribution licensing is described in the [License section of the README](README.md#License).
 
 API/ABI Compatibility
 ---------------------
@@ -46,18 +42,14 @@
 
 When backporting to these branches please observe the following rules:
 
- 1. Any change to the library which changes the API or ABI cannot be backported.
-
- 2. All bug fixes that correct a defect that is also present in an LTS branch must be backported to that LTS branch. If a bug fix introduces a change to the API such as a new function, the fix should be reworked to avoid the API change. API changes without very strong justification are unlikely to be accepted.
-
- 3. If a contribution is a new feature or enhancement, no backporting is required. Exceptions to this may be additional test cases or quality improvements such as changes to build or test scripts.
+1. Any change to the library which changes the API or ABI cannot be backported.
+1. All bug fixes that correct a defect that is also present in an LTS branch must be backported to that LTS branch. If a bug fix introduces a change to the API such as a new function, the fix should be reworked to avoid the API change. API changes without very strong justification are unlikely to be accepted.
+1. If a contribution is a new feature or enhancement, no backporting is required. Exceptions to this may be additional test cases or quality improvements such as changes to build or test scripts.
 
 It would be highly appreciated if contributions are backported to LTS branches in addition to the [development branch](https://github.com/ARMmbed/mbedtls/tree/development) by contributors.
 
 Currently maintained LTS branches are:
-
 1. [mbedtls-2.7](https://github.com/ARMmbed/mbedtls/tree/mbedtls-2.7)
-
 1. [mbedtls-2.16](https://github.com/ARMmbed/mbedtls/tree/mbedtls-2.16)
 
 
@@ -84,12 +76,7 @@
 Mbed TLS is well documented, but if you think documentation is needed, speak out!
 
 1. All interfaces should be documented through Doxygen. New APIs should introduce Doxygen documentation.
-
-2. Complex parts in the code should include comments.
-
-3. If needed, a Readme file is advised.
-
-4. If a [Knowledge Base (KB)](https://tls.mbed.org/kb) article should be added, write this as a comment in the PR description.
-
-5. A [ChangeLog](https://github.com/ARMmbed/mbedtls/blob/development/ChangeLog) entry should be added for this contribution.
-
+1. Complex parts in the code should include comments.
+1. If needed, a Readme file is advised.
+1. If a [Knowledge Base (KB)](https://tls.mbed.org/kb) article should be added, write this as a comment in the PR description.
+1. A [ChangeLog](https://github.com/ARMmbed/mbedtls/blob/development/ChangeLog) entry should be added for this contribution.
diff --git a/LICENSE b/LICENSE
index 546a8e6..d645695 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,2 +1,202 @@
-Unless specifically indicated otherwise in a file, files are licensed
-under the Apache 2.0 license, as can be found in: apache-2.0.txt
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/README.md b/README.md
index 16ba188..f8bb346 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 README for Mbed TLS
 ===================
 
+Mbed TLS is a C library that implements cryptographic primitives, X.509 certificate manipulation and the SSL/TLS and DTLS protocols. Its small code footprint makes it suitable for embedded systems.
+
 Configuration
 -------------
 
@@ -191,21 +193,12 @@
 -   [What external dependencies does Mbed TLS rely on?](https://tls.mbed.org/kb/development/what-external-dependencies-does-mbedtls-rely-on)
 -   [How do I configure Mbed TLS](https://tls.mbed.org/kb/compiling-and-building/how-do-i-configure-mbedtls)
 
+License
+-------
+
+Unless specifically indicated otherwise in a file, Mbed TLS files are provided under the [Apache-2.0](https://spdx.org/licenses/Apache-2.0.html) license. See the [LICENSE](LICENSE) file for the full text of this license. Contributors must accept that their contributions are made under both the Apache-2.0 AND [GPL-2.0-or-later](https://spdx.org/licenses/GPL-2.0-or-later.html) licenses. This enables LTS (Long Term Support) branches of the software to be provided under either the Apache-2.0 OR GPL-2.0-or-later licenses.
+
 Contributing
 ------------
 
-We gratefully accept bug reports and contributions from the community. There are some requirements we need to fulfill in order to be able to integrate contributions:
-
--   All contributions, whether large or small require a Contributor's License Agreement (CLA) to be accepted. This is because source code can possibly fall under copyright law and we need your consent to share in the ownership of the copyright.
--   We would ask that contributions conform to [our coding standards](https://tls.mbed.org/kb/development/mbedtls-coding-standards), and that contributions should be fully tested before submission.
--   As with any open source project, contributions will be reviewed by the project team and community and may need some modifications to be accepted.
-
-To accept the Contributor’s Licence Agreement (CLA), individual contributors can do this by creating an Mbed account and [accepting the online agreement here with a click through](https://os.mbed.com/contributor_agreement/). Alternatively, for contributions from corporations, or those that do not wish to create an Mbed account, a slightly different agreement can be found [here](https://www.mbed.com/en/about-mbed/contributor-license-agreements/). This agreement should be signed and returned to Arm as described in the instructions given.
-
-### Making a Contribution
-
-1.  [Check for open issues](https://github.com/ARMmbed/mbedtls/issues) or [start a discussion](https://forums.mbed.com/c/mbed-tls) around a feature idea or a bug.
-2.  Fork the [Mbed TLS repository on GitHub](https://github.com/ARMmbed/mbedtls) to start making your changes. As a general rule, you should use the "development" branch as a basis.
-3.  Write a test which shows that the bug was fixed or that the feature works as expected.
-4.  Send a pull request and bug us until it gets merged and published. Contributions may need some modifications, so work with us to get your change accepted. We will include your name in the ChangeLog :)
-
+We gratefully accept bug reports and contributions from the community. Please see the [contributing guidelines](CONTRIBUTING.md) for details on how to do this.
diff --git a/apache-2.0.txt b/apache-2.0.txt
deleted file mode 100644
index d645695..0000000
--- a/apache-2.0.txt
+++ /dev/null
@@ -1,202 +0,0 @@
-
-                                 Apache License
-                           Version 2.0, January 2004
-                        http://www.apache.org/licenses/
-
-   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
-
-   1. Definitions.
-
-      "License" shall mean the terms and conditions for use, reproduction,
-      and distribution as defined by Sections 1 through 9 of this document.
-
-      "Licensor" shall mean the copyright owner or entity authorized by
-      the copyright owner that is granting the License.
-
-      "Legal Entity" shall mean the union of the acting entity and all
-      other entities that control, are controlled by, or are under common
-      control with that entity. For the purposes of this definition,
-      "control" means (i) the power, direct or indirect, to cause the
-      direction or management of such entity, whether by contract or
-      otherwise, or (ii) ownership of fifty percent (50%) or more of the
-      outstanding shares, or (iii) beneficial ownership of such entity.
-
-      "You" (or "Your") shall mean an individual or Legal Entity
-      exercising permissions granted by this License.
-
-      "Source" form shall mean the preferred form for making modifications,
-      including but not limited to software source code, documentation
-      source, and configuration files.
-
-      "Object" form shall mean any form resulting from mechanical
-      transformation or translation of a Source form, including but
-      not limited to compiled object code, generated documentation,
-      and conversions to other media types.
-
-      "Work" shall mean the work of authorship, whether in Source or
-      Object form, made available under the License, as indicated by a
-      copyright notice that is included in or attached to the work
-      (an example is provided in the Appendix below).
-
-      "Derivative Works" shall mean any work, whether in Source or Object
-      form, that is based on (or derived from) the Work and for which the
-      editorial revisions, annotations, elaborations, or other modifications
-      represent, as a whole, an original work of authorship. For the purposes
-      of this License, Derivative Works shall not include works that remain
-      separable from, or merely link (or bind by name) to the interfaces of,
-      the Work and Derivative Works thereof.
-
-      "Contribution" shall mean any work of authorship, including
-      the original version of the Work and any modifications or additions
-      to that Work or Derivative Works thereof, that is intentionally
-      submitted to Licensor for inclusion in the Work by the copyright owner
-      or by an individual or Legal Entity authorized to submit on behalf of
-      the copyright owner. For the purposes of this definition, "submitted"
-      means any form of electronic, verbal, or written communication sent
-      to the Licensor or its representatives, including but not limited to
-      communication on electronic mailing lists, source code control systems,
-      and issue tracking systems that are managed by, or on behalf of, the
-      Licensor for the purpose of discussing and improving the Work, but
-      excluding communication that is conspicuously marked or otherwise
-      designated in writing by the copyright owner as "Not a Contribution."
-
-      "Contributor" shall mean Licensor and any individual or Legal Entity
-      on behalf of whom a Contribution has been received by Licensor and
-      subsequently incorporated within the Work.
-
-   2. Grant of Copyright License. Subject to the terms and conditions of
-      this License, each Contributor hereby grants to You a perpetual,
-      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
-      copyright license to reproduce, prepare Derivative Works of,
-      publicly display, publicly perform, sublicense, and distribute the
-      Work and such Derivative Works in Source or Object form.
-
-   3. Grant of Patent License. Subject to the terms and conditions of
-      this License, each Contributor hereby grants to You a perpetual,
-      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
-      (except as stated in this section) patent license to make, have made,
-      use, offer to sell, sell, import, and otherwise transfer the Work,
-      where such license applies only to those patent claims licensable
-      by such Contributor that are necessarily infringed by their
-      Contribution(s) alone or by combination of their Contribution(s)
-      with the Work to which such Contribution(s) was submitted. If You
-      institute patent litigation against any entity (including a
-      cross-claim or counterclaim in a lawsuit) alleging that the Work
-      or a Contribution incorporated within the Work constitutes direct
-      or contributory patent infringement, then any patent licenses
-      granted to You under this License for that Work shall terminate
-      as of the date such litigation is filed.
-
-   4. Redistribution. You may reproduce and distribute copies of the
-      Work or Derivative Works thereof in any medium, with or without
-      modifications, and in Source or Object form, provided that You
-      meet the following conditions:
-
-      (a) You must give any other recipients of the Work or
-          Derivative Works a copy of this License; and
-
-      (b) You must cause any modified files to carry prominent notices
-          stating that You changed the files; and
-
-      (c) You must retain, in the Source form of any Derivative Works
-          that You distribute, all copyright, patent, trademark, and
-          attribution notices from the Source form of the Work,
-          excluding those notices that do not pertain to any part of
-          the Derivative Works; and
-
-      (d) If the Work includes a "NOTICE" text file as part of its
-          distribution, then any Derivative Works that You distribute must
-          include a readable copy of the attribution notices contained
-          within such NOTICE file, excluding those notices that do not
-          pertain to any part of the Derivative Works, in at least one
-          of the following places: within a NOTICE text file distributed
-          as part of the Derivative Works; within the Source form or
-          documentation, if provided along with the Derivative Works; or,
-          within a display generated by the Derivative Works, if and
-          wherever such third-party notices normally appear. The contents
-          of the NOTICE file are for informational purposes only and
-          do not modify the License. You may add Your own attribution
-          notices within Derivative Works that You distribute, alongside
-          or as an addendum to the NOTICE text from the Work, provided
-          that such additional attribution notices cannot be construed
-          as modifying the License.
-
-      You may add Your own copyright statement to Your modifications and
-      may provide additional or different license terms and conditions
-      for use, reproduction, or distribution of Your modifications, or
-      for any such Derivative Works as a whole, provided Your use,
-      reproduction, and distribution of the Work otherwise complies with
-      the conditions stated in this License.
-
-   5. Submission of Contributions. Unless You explicitly state otherwise,
-      any Contribution intentionally submitted for inclusion in the Work
-      by You to the Licensor shall be under the terms and conditions of
-      this License, without any additional terms or conditions.
-      Notwithstanding the above, nothing herein shall supersede or modify
-      the terms of any separate license agreement you may have executed
-      with Licensor regarding such Contributions.
-
-   6. Trademarks. This License does not grant permission to use the trade
-      names, trademarks, service marks, or product names of the Licensor,
-      except as required for reasonable and customary use in describing the
-      origin of the Work and reproducing the content of the NOTICE file.
-
-   7. Disclaimer of Warranty. Unless required by applicable law or
-      agreed to in writing, Licensor provides the Work (and each
-      Contributor provides its Contributions) on an "AS IS" BASIS,
-      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
-      implied, including, without limitation, any warranties or conditions
-      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
-      PARTICULAR PURPOSE. You are solely responsible for determining the
-      appropriateness of using or redistributing the Work and assume any
-      risks associated with Your exercise of permissions under this License.
-
-   8. Limitation of Liability. In no event and under no legal theory,
-      whether in tort (including negligence), contract, or otherwise,
-      unless required by applicable law (such as deliberate and grossly
-      negligent acts) or agreed to in writing, shall any Contributor be
-      liable to You for damages, including any direct, indirect, special,
-      incidental, or consequential damages of any character arising as a
-      result of this License or out of the use or inability to use the
-      Work (including but not limited to damages for loss of goodwill,
-      work stoppage, computer failure or malfunction, or any and all
-      other commercial damages or losses), even if such Contributor
-      has been advised of the possibility of such damages.
-
-   9. Accepting Warranty or Additional Liability. While redistributing
-      the Work or Derivative Works thereof, You may choose to offer,
-      and charge a fee for, acceptance of support, warranty, indemnity,
-      or other liability obligations and/or rights consistent with this
-      License. However, in accepting such obligations, You may act only
-      on Your own behalf and on Your sole responsibility, not on behalf
-      of any other Contributor, and only if You agree to indemnify,
-      defend, and hold each Contributor harmless for any liability
-      incurred by, or claims asserted against, such Contributor by reason
-      of your accepting any such warranty or additional liability.
-
-   END OF TERMS AND CONDITIONS
-
-   APPENDIX: How to apply the Apache License to your work.
-
-      To apply the Apache License to your work, attach the following
-      boilerplate notice, with the fields enclosed by brackets "[]"
-      replaced with your own identifying information. (Don't include
-      the brackets!)  The text should be enclosed in the appropriate
-      comment syntax for the file format. We also recommend that a
-      file or class name and description of purpose be included on the
-      same "printed page" as the copyright notice for easier
-      identification within third-party archives.
-
-   Copyright [yyyy] [name of copyright owner]
-
-   Licensed under the Apache License, Version 2.0 (the "License");
-   you may not use this file except in compliance with the License.
-   You may obtain a copy of the License at
-
-       http://www.apache.org/licenses/LICENSE-2.0
-
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
diff --git a/dco.txt b/dco.txt
new file mode 100644
index 0000000..8201f99
--- /dev/null
+++ b/dco.txt
@@ -0,0 +1,37 @@
+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+1 Letterman Drive
+Suite D4700
+San Francisco, CA, 94129
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+
+Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the best
+    of my knowledge, is covered under an appropriate open source
+    license and I have the right under that license to submit that
+    work with modifications, whether created in whole or in part
+    by me, under the same open source license (unless I am
+    permitted to submit under a different license), as indicated
+    in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including all
+    personal information I submit with it, including my sign-off) is
+    maintained indefinitely and may be redistributed consistent with
+    this project or the open source license(s) involved.
diff --git a/programs/fuzz/fuzz_privkey.c b/programs/fuzz/fuzz_privkey.c
index 178d17b..6c968fd 100644
--- a/programs/fuzz/fuzz_privkey.c
+++ b/programs/fuzz/fuzz_privkey.c
@@ -44,20 +44,26 @@
         else
 #endif
 #if defined(MBEDTLS_ECP_C)
-        if( mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_ECKEY )
+        if( mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_ECKEY ||
+            mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_ECKEY_DH )
         {
-            mbedtls_ecp_keypair *ecp;
+            mbedtls_ecp_keypair *ecp = mbedtls_pk_ec( pk );
+            mbedtls_ecp_group_id grp_id = ecp->grp.id;
+            const mbedtls_ecp_curve_info *curve_info =
+                mbedtls_ecp_curve_info_from_grp_id( grp_id );
 
-            ecp = mbedtls_pk_ec( pk );
-            if (ecp) {
-                ret = 0;
-            }
+            /* If the curve is not supported, the key should not have been
+             * accepted. */
+            if( curve_info == NULL )
+                abort( );
         }
         else
 #endif
-            {
-                ret = 0;
-            }
+        {
+            /* The key is valid but is not of a supported type.
+             * This should not happen. */
+            abort( );
+        }
     }
     mbedtls_pk_free( &pk );
 #else
diff --git a/programs/fuzz/fuzz_pubkey.c b/programs/fuzz/fuzz_pubkey.c
index 38eacfb..9e80350 100644
--- a/programs/fuzz/fuzz_pubkey.c
+++ b/programs/fuzz/fuzz_pubkey.c
@@ -21,7 +21,10 @@
             mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
 
             rsa = mbedtls_pk_rsa( pk );
-            if ( mbedtls_rsa_export( rsa, &N, &P, &Q, &D, &E ) != 0 ) {
+            if ( mbedtls_rsa_export( rsa, &N, NULL, NULL, NULL, &E ) != 0 ) {
+                abort();
+            }
+            if ( mbedtls_rsa_export( rsa, &N, &P, &Q, &D, &E ) != MBEDTLS_ERR_RSA_BAD_INPUT_DATA ) {
                 abort();
             }
             if ( mbedtls_rsa_export_crt( rsa, &DP, &DQ, &QP ) != MBEDTLS_ERR_RSA_BAD_INPUT_DATA ) {
@@ -36,20 +39,30 @@
         else
 #endif
 #if defined(MBEDTLS_ECP_C)
-        if( mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_ECKEY )
+        if( mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_ECKEY ||
+            mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_ECKEY_DH )
         {
-            mbedtls_ecp_keypair *ecp;
+            mbedtls_ecp_keypair *ecp = mbedtls_pk_ec( pk );
+            mbedtls_ecp_group_id grp_id = ecp->grp.id;
+            const mbedtls_ecp_curve_info *curve_info =
+                mbedtls_ecp_curve_info_from_grp_id( grp_id );
 
-            ecp = mbedtls_pk_ec( pk );
-            //dummy use of value
-            if (ecp) {
-                ret = 0;
-            }
+            /* If the curve is not supported, the key should not have been
+             * accepted. */
+            if( curve_info == NULL )
+                abort( );
+
+            /* It's a public key, so the private value should not have
+             * been changed from its initialization to 0. */
+            if( mbedtls_mpi_cmp_int( &ecp->d, 0 ) != 0 )
+                abort( );
         }
         else
 #endif
         {
-            ret = 0;
+            /* The key is valid but is not of a supported type.
+             * This should not happen. */
+            abort( );
         }
     }
     mbedtls_pk_free( &pk );
diff --git a/programs/ssl/ssl_client2.c b/programs/ssl/ssl_client2.c
index c188900..ab72f15 100644
--- a/programs/ssl/ssl_client2.c
+++ b/programs/ssl/ssl_client2.c
@@ -145,6 +145,7 @@
 #define DFL_REPRODUCIBLE        0
 #define DFL_NSS_KEYLOG          0
 #define DFL_NSS_KEYLOG_FILE     NULL
+#define DFL_SKIP_CLOSE_NOTIFY   0
 
 #define GET_REQUEST "GET %s HTTP/1.0\r\nExtra-header: "
 #define GET_REQUEST_END "\r\n\r\n"
@@ -389,6 +390,7 @@
     "                        options: 1 (level-triggered, implies nbio=1),\n" \
     "    read_timeout=%%d     default: 0 ms (no timeout)\n"        \
     "    max_resend=%%d       default: 0 (no resend on timeout)\n" \
+    "    skip_close_notify=%%d default: 0 (send close_notify)\n" \
     "\n"                                                    \
     USAGE_DTLS                                              \
     USAGE_CID                                               \
@@ -517,6 +519,7 @@
     const char *cid_val_renego; /* the CID to use for incoming messages
                                  * after renegotiation                      */
     int reproducible;           /* make communication reproducible          */
+    int skip_close_notify;      /* skip sending the close_notify alert      */
 } opt;
 
 int query_config( const char *config );
@@ -1311,6 +1314,7 @@
     opt.reproducible        = DFL_REPRODUCIBLE;
     opt.nss_keylog          = DFL_NSS_KEYLOG;
     opt.nss_keylog_file     = DFL_NSS_KEYLOG_FILE;
+    opt.skip_close_notify   = DFL_SKIP_CLOSE_NOTIFY;
 
     for( i = 1; i < argc; i++ )
     {
@@ -1723,6 +1727,12 @@
         {
             opt.nss_keylog_file = q;
         }
+        else if( strcmp( p, "skip_close_notify" ) == 0 )
+        {
+            opt.skip_close_notify = atoi( q );
+            if( opt.skip_close_notify < 0 || opt.skip_close_notify > 1 )
+                goto usage;
+        }
         else
             goto usage;
     }
@@ -3160,10 +3170,25 @@
     mbedtls_printf( "  . Closing the connection..." );
     fflush( stdout );
 
-    /* No error checking, the connection might be closed already */
-    do ret = mbedtls_ssl_close_notify( &ssl );
-    while( ret == MBEDTLS_ERR_SSL_WANT_WRITE );
-    ret = 0;
+    /*
+     * Most of the time sending a close_notify before closing is the right
+     * thing to do. However, when the server already knows how many messages
+     * are expected and closes the connection by itself, this alert becomes
+     * redundant. Sometimes with DTLS this redundancy becomes a problem by
+     * leading to a race condition where the server might close the connection
+     * before seeing the alert, and since UDP is connection-less when the
+     * alert arrives it will be seen as a new connection, which will fail as
+     * the alert is clearly not a valid ClientHello. This may cause spurious
+     * failures in tests that use DTLS and resumption with ssl_server2 in
+     * ssl-opt.sh, avoided by enabling skip_close_notify client-side.
+     */
+    if( opt.skip_close_notify == 0 )
+    {
+        /* No error checking, the connection might be closed already */
+        do ret = mbedtls_ssl_close_notify( &ssl );
+        while( ret == MBEDTLS_ERR_SSL_WANT_WRITE );
+        ret = 0;
+    }
 
     mbedtls_printf( " done\n" );
 
diff --git a/scripts/output_env.sh b/scripts/output_env.sh
index c809d46..0e06794 100755
--- a/scripts/output_env.sh
+++ b/scripts/output_env.sh
@@ -23,11 +23,15 @@
     shift
     ARGS="$1"
     shift
-    FAIL_MSG="$1"
+    VARIANT="$1"
     shift
 
-    if ! `type "$BIN" > /dev/null 2>&1`; then
-        echo "* $FAIL_MSG"
+    if [ -n "$VARIANT" ]; then
+        VARIANT=" ($VARIANT)"
+    fi
+
+    if ! type "$BIN" > /dev/null 2>&1; then
+        echo " * ${BIN##*/}$VARIANT: Not found."
         return 0
     fi
 
@@ -41,81 +45,118 @@
         VERSION_STR=`echo "$VERSION_STR" | $FILTER`
     done
 
-    echo "* ${BIN##*/}: $BIN: $VERSION_STR"
+    if [ -z "$VERSION_STR" ]; then
+        VERSION_STR="Version could not be determined."
+    fi
+
+    echo " * ${BIN##*/}$VARIANT: ${BIN} : ${VERSION_STR} "
 }
 
+echo "** Platform:"
+echo
+
+if [ `uname -s` = "Linux" ]; then
+    echo "Linux variant"
+    lsb_release -d -c
+else
+    echo "Unknown Unix variant"
+fi
+
+echo
+
 print_version "uname" "-a" ""
+
+echo
+echo
+echo "** Tool Versions:"
 echo
 
 if [ "${RUN_ARMCC:-1}" -ne 0 ]; then
     : "${ARMC5_CC:=armcc}"
-    print_version "$ARMC5_CC" "--vsn" "armcc not found!" "head -n 2"
+    print_version "$ARMC5_CC" "--vsn" "" "head -n 2"
     echo
 
     : "${ARMC6_CC:=armclang}"
-    print_version "$ARMC6_CC" "--vsn" "armclang not found!" "head -n 2"
+    print_version "$ARMC6_CC" "--vsn" "" "head -n 2"
     echo
 fi
 
-print_version "arm-none-eabi-gcc" "--version" "gcc-arm not found!" "head -n 1"
+print_version "arm-none-eabi-gcc" "--version" "" "head -n 1"
 echo
 
-print_version "gcc" "--version" "gcc not found!" "head -n 1"
+print_version "gcc" "--version" "" "head -n 1"
 echo
 
-print_version "clang" "--version" "clang not found" "head -n 2"
+print_version "clang" "--version" "" "head -n 2"
 echo
 
-print_version "ldd" "--version"                     \
-    "No ldd present: can't determine libc version!" \
-    "head -n 1"
+print_version "ldd" "--version" "" "head -n 1"
 echo
 
-print_version "valgrind" "--version" "valgrind not found!"
+print_version "valgrind" "--version" ""
+echo
+
+print_version "gdb" "--version" "" "head -n 1"
+echo
+
+print_version "perl" "--version" "" "head -n 2" "grep ."
+echo
+
+print_version "python" "--version" "" "head -n 1"
+echo
+
+print_version "pylint3" "--version" "" "sed /^.*config/d" "grep pylint"
 echo
 
 : ${OPENSSL:=openssl}
-print_version "$OPENSSL" "version" "openssl not found!"
+print_version "$OPENSSL" "version" "default"
 echo
 
 if [ -n "${OPENSSL_LEGACY+set}" ]; then
-    print_version "$OPENSSL_LEGACY" "version" "openssl legacy version not found!"
-    echo
+    print_version "$OPENSSL_LEGACY" "version" "legacy"
+else
+    echo " * openssl (legacy): Not configured."
 fi
+echo
 
 if [ -n "${OPENSSL_NEXT+set}" ]; then
-    print_version "$OPENSSL_NEXT" "version" "openssl next version not found!"
-    echo
+    print_version "$OPENSSL_NEXT" "version" "next"
+else
+    echo " * openssl (next): Not configured."
 fi
+echo
 
 : ${GNUTLS_CLI:=gnutls-cli}
-print_version "$GNUTLS_CLI" "--version" "gnuTLS client not found!" "head -n 1"
+print_version "$GNUTLS_CLI" "--version" "default" "head -n 1"
 echo
 
 : ${GNUTLS_SERV:=gnutls-serv}
-print_version "$GNUTLS_SERV" "--version" "gnuTLS server not found!" "head -n 1"
+print_version "$GNUTLS_SERV" "--version" "default" "head -n 1"
 echo
 
 if [ -n "${GNUTLS_LEGACY_CLI+set}" ]; then
-    print_version "$GNUTLS_LEGACY_CLI" "--version" \
-        "gnuTLS client legacy version not found!"  \
-        "head -n 1"
-    echo
+    print_version "$GNUTLS_LEGACY_CLI" "--version" "legacy" "head -n 1"
+else
+     echo " * gnutls-cli (legacy): Not configured."
 fi
+echo
 
 if [ -n "${GNUTLS_LEGACY_SERV+set}" ]; then
-    print_version "$GNUTLS_LEGACY_SERV" "--version" \
-        "gnuTLS server legacy version not found!"   \
-        "head -n 1"
-    echo
-fi
-
-if `hash dpkg > /dev/null 2>&1`; then
-    echo "* asan:"
-    dpkg -s libasan2 2> /dev/null | grep -i version
-    dpkg -s libasan1 2> /dev/null | grep -i version
-    dpkg -s libasan0 2> /dev/null | grep -i version
+    print_version "$GNUTLS_LEGACY_SERV" "--version" "legacy" "head -n 1"
 else
-    echo "* No dpkg present: can't determine asan version!"
+    echo " * gnutls-serv (legacy): Not configured."
+fi
+echo
+
+echo " * Installed asan versions:"
+if type dpkg-query >/dev/null 2>/dev/null; then
+    if ! dpkg-query -f '${Status} ${Package}: ${Version}\n' -W 'libasan*' |
+         awk '$3 == "installed" && $4 !~ /-/ {print $4, $5}' |
+         grep .
+    then
+        echo "   No asan versions installed."
+    fi
+else
+    echo "  Unable to determine the asan version without dpkg."
 fi
 echo
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 9246eae..bc66fcb 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -1254,8 +1254,8 @@
 
 component_test_malloc_0_null () {
     msg "build: malloc(0) returns NULL (ASan+UBSan build)"
-    scripts/config.pl full
-    scripts/config.pl unset MBEDTLS_MEMORY_BUFFER_ALLOC_C
+    scripts/config.py full
+    scripts/config.py unset MBEDTLS_MEMORY_BUFFER_ALLOC_C
     make CC=gcc CFLAGS="'-DMBEDTLS_CONFIG_FILE=\"$PWD/tests/configs/config-wrapper-malloc-0-null.h\"' -O -Werror -Wall -Wextra -fsanitize=address,undefined" LDFLAGS='-fsanitize=address,undefined'
 
     msg "test: malloc(0) returns NULL (ASan+UBSan build)"
@@ -1304,12 +1304,12 @@
 }
 
 component_test_clang_opt () {
-    scripts/config.pl full
+    scripts/config.py full
     test_build_opt 'full config' clang -O0 -Os -O2
 }
 
 component_test_gcc_opt () {
-    scripts/config.pl full
+    scripts/config.py full
     test_build_opt 'full config' gcc -O0 -Os -O2
 }
 
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index cc6bc13..32f218d 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -2626,7 +2626,7 @@
 
 run_test    "Session resume using tickets, DTLS: basic" \
             "$P_SRV debug_level=3 dtls=1 tickets=1" \
-            "$P_CLI debug_level=3 dtls=1 tickets=1 reconnect=1" \
+            "$P_CLI debug_level=3 dtls=1 tickets=1 reconnect=1 skip_close_notify=1" \
             0 \
             -c "client hello, adding session ticket extension" \
             -s "found session ticket extension" \
@@ -2640,7 +2640,7 @@
 
 run_test    "Session resume using tickets, DTLS: cache disabled" \
             "$P_SRV debug_level=3 dtls=1 tickets=1 cache_max=0" \
-            "$P_CLI debug_level=3 dtls=1 tickets=1 reconnect=1" \
+            "$P_CLI debug_level=3 dtls=1 tickets=1 reconnect=1 skip_close_notify=1" \
             0 \
             -c "client hello, adding session ticket extension" \
             -s "found session ticket extension" \
@@ -2654,7 +2654,7 @@
 
 run_test    "Session resume using tickets, DTLS: timeout" \
             "$P_SRV debug_level=3 dtls=1 tickets=1 cache_max=0 ticket_timeout=1" \
-            "$P_CLI debug_level=3 dtls=1 tickets=1 reconnect=1 reco_delay=2" \
+            "$P_CLI debug_level=3 dtls=1 tickets=1 reconnect=1 skip_close_notify=1 reco_delay=2" \
             0 \
             -c "client hello, adding session ticket extension" \
             -s "found session ticket extension" \
@@ -2668,7 +2668,7 @@
 
 run_test    "Session resume using tickets, DTLS: session copy" \
             "$P_SRV debug_level=3 dtls=1 tickets=1 cache_max=0" \
-            "$P_CLI debug_level=3 dtls=1 tickets=1 reconnect=1 reco_mode=0" \
+            "$P_CLI debug_level=3 dtls=1 tickets=1 reconnect=1 skip_close_notify=1 reco_mode=0" \
             0 \
             -c "client hello, adding session ticket extension" \
             -s "found session ticket extension" \
@@ -2809,7 +2809,7 @@
 
 run_test    "Session resume using cache, DTLS: tickets enabled on client" \
             "$P_SRV dtls=1 debug_level=3 tickets=0" \
-            "$P_CLI dtls=1 debug_level=3 tickets=1 reconnect=1" \
+            "$P_CLI dtls=1 debug_level=3 tickets=1 reconnect=1 skip_close_notify=1" \
             0 \
             -c "client hello, adding session ticket extension" \
             -s "found session ticket extension" \
@@ -2823,7 +2823,7 @@
 
 run_test    "Session resume using cache, DTLS: tickets enabled on server" \
             "$P_SRV dtls=1 debug_level=3 tickets=1" \
-            "$P_CLI dtls=1 debug_level=3 tickets=0 reconnect=1" \
+            "$P_CLI dtls=1 debug_level=3 tickets=0 reconnect=1 skip_close_notify=1" \
             0 \
             -C "client hello, adding session ticket extension" \
             -S "found session ticket extension" \
@@ -2837,7 +2837,7 @@
 
 run_test    "Session resume using cache, DTLS: cache_max=0" \
             "$P_SRV dtls=1 debug_level=3 tickets=0 cache_max=0" \
-            "$P_CLI dtls=1 debug_level=3 tickets=0 reconnect=1" \
+            "$P_CLI dtls=1 debug_level=3 tickets=0 reconnect=1 skip_close_notify=1" \
             0 \
             -S "session successfully restored from cache" \
             -S "session successfully restored from ticket" \
@@ -2846,7 +2846,7 @@
 
 run_test    "Session resume using cache, DTLS: cache_max=1" \
             "$P_SRV dtls=1 debug_level=3 tickets=0 cache_max=1" \
-            "$P_CLI dtls=1 debug_level=3 tickets=0 reconnect=1" \
+            "$P_CLI dtls=1 debug_level=3 tickets=0 reconnect=1 skip_close_notify=1" \
             0 \
             -s "session successfully restored from cache" \
             -S "session successfully restored from ticket" \
@@ -2855,7 +2855,7 @@
 
 run_test    "Session resume using cache, DTLS: timeout > delay" \
             "$P_SRV dtls=1 debug_level=3 tickets=0" \
-            "$P_CLI dtls=1 debug_level=3 tickets=0 reconnect=1 reco_delay=0" \
+            "$P_CLI dtls=1 debug_level=3 tickets=0 reconnect=1 skip_close_notify=1 reco_delay=0" \
             0 \
             -s "session successfully restored from cache" \
             -S "session successfully restored from ticket" \
@@ -2864,7 +2864,7 @@
 
 run_test    "Session resume using cache, DTLS: timeout < delay" \
             "$P_SRV dtls=1 debug_level=3 tickets=0 cache_timeout=1" \
-            "$P_CLI dtls=1 debug_level=3 tickets=0 reconnect=1 reco_delay=2" \
+            "$P_CLI dtls=1 debug_level=3 tickets=0 reconnect=1 skip_close_notify=1 reco_delay=2" \
             0 \
             -S "session successfully restored from cache" \
             -S "session successfully restored from ticket" \
@@ -2873,7 +2873,7 @@
 
 run_test    "Session resume using cache, DTLS: no timeout" \
             "$P_SRV dtls=1 debug_level=3 tickets=0 cache_timeout=0" \
-            "$P_CLI dtls=1 debug_level=3 tickets=0 reconnect=1 reco_delay=2" \
+            "$P_CLI dtls=1 debug_level=3 tickets=0 reconnect=1 skip_close_notify=1 reco_delay=2" \
             0 \
             -s "session successfully restored from cache" \
             -S "session successfully restored from ticket" \
@@ -2882,7 +2882,7 @@
 
 run_test    "Session resume using cache, DTLS: session copy" \
             "$P_SRV dtls=1 debug_level=3 tickets=0" \
-            "$P_CLI dtls=1 debug_level=3 tickets=0 reconnect=1 reco_mode=0" \
+            "$P_CLI dtls=1 debug_level=3 tickets=0 reconnect=1 skip_close_notify=1 reco_mode=0" \
             0 \
             -s "session successfully restored from cache" \
             -S "session successfully restored from ticket" \
@@ -4634,19 +4634,19 @@
 
 run_test    "Event-driven I/O, DTLS: ticket + client auth + resume" \
             "$P_SRV dtls=1 event=1 tickets=1 auth_mode=required" \
-            "$P_CLI dtls=1 event=1 tickets=1 reconnect=1" \
+            "$P_CLI dtls=1 event=1 tickets=1 reconnect=1 skip_close_notify=1" \
             0 \
             -c "Read from server: .* bytes read"
 
 run_test    "Event-driven I/O, DTLS: ticket + resume" \
             "$P_SRV dtls=1 event=1 tickets=1 auth_mode=none" \
-            "$P_CLI dtls=1 event=1 tickets=1 reconnect=1" \
+            "$P_CLI dtls=1 event=1 tickets=1 reconnect=1 skip_close_notify=1" \
             0 \
             -c "Read from server: .* bytes read"
 
 run_test    "Event-driven I/O, DTLS: session-id resume" \
             "$P_SRV dtls=1 event=1 tickets=0 auth_mode=none" \
-            "$P_CLI dtls=1 event=1 tickets=0 reconnect=1" \
+            "$P_CLI dtls=1 event=1 tickets=0 reconnect=1 skip_close_notify=1" \
             0 \
             -c "Read from server: .* bytes read"
 
@@ -4658,7 +4658,7 @@
 run_test    "Event-driven I/O, DTLS: session-id resume, UDP packing" \
             -p "$P_PXY pack=50" \
             "$P_SRV dtls=1 event=1 tickets=0 auth_mode=required" \
-            "$P_CLI dtls=1 event=1 tickets=0 reconnect=1" \
+            "$P_CLI dtls=1 event=1 tickets=0 reconnect=1 skip_close_notify=1" \
             0 \
             -c "Read from server: .* bytes read"
 
@@ -7898,7 +7898,7 @@
              key_file=data_files/server8.key \
              hs_timeout=10000-60000 \
              force_ciphersuite=TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256 \
-             mtu=1450 reconnect=1 reco_delay=1" \
+             mtu=1450 reconnect=1 skip_close_notify=1 reco_delay=1" \
             0 \
             -S "autoreduction" \
             -s "found fragmented DTLS handshake message" \
@@ -8747,7 +8747,7 @@
             "$P_SRV dtls=1 dgram_packing=0 hs_timeout=500-10000 tickets=0 auth_mode=none \
              psk=abc123 debug_level=3" \
             "$P_CLI dtls=1 dgram_packing=0 hs_timeout=500-10000 tickets=0 psk=abc123 \
-             debug_level=3 reconnect=1 read_timeout=1000 max_resend=10 \
+             debug_level=3 reconnect=1 skip_close_notify=1 read_timeout=1000 max_resend=10 \
              force_ciphersuite=TLS-PSK-WITH-AES-128-CCM-8" \
             0 \
             -s "a session has been resumed" \
@@ -8761,7 +8761,7 @@
             "$P_SRV dtls=1 dgram_packing=0 hs_timeout=500-10000 tickets=0 auth_mode=none \
              psk=abc123 debug_level=3 nbio=2" \
             "$P_CLI dtls=1 dgram_packing=0 hs_timeout=500-10000 tickets=0 psk=abc123 \
-             debug_level=3 reconnect=1 read_timeout=1000 max_resend=10 \
+             debug_level=3 reconnect=1 skip_close_notify=1 read_timeout=1000 max_resend=10 \
              force_ciphersuite=TLS-PSK-WITH-AES-128-CCM-8 nbio=2" \
             0 \
             -s "a session has been resumed" \
diff --git a/tests/suites/test_suite_ssl.function b/tests/suites/test_suite_ssl.function
index 9b61a50..5df4b47 100644
--- a/tests/suites/test_suite_ssl.function
+++ b/tests/suites/test_suite_ssl.function
@@ -554,6 +554,13 @@
     mbedtls_mock_socket* socket;
 } mbedtls_test_message_socket_context;
 
+void mbedtls_message_socket_init( mbedtls_test_message_socket_context *ctx )
+{
+    ctx->queue_input = NULL;
+    ctx->queue_output = NULL;
+    ctx->socket = NULL;
+}
+
 /*
  * Setup a given mesasge socket context including initialization of
  * input/output queues to a chosen capacity of messages. Also set the
@@ -1654,6 +1661,8 @@
 
     mbedtls_test_message_queue server_queue, client_queue;
     mbedtls_test_message_socket_context server_context, client_context;
+    mbedtls_message_socket_init( &server_context );
+    mbedtls_message_socket_init( &client_context );
 
     /* Client side */
     if( options->dtls != 0 )
@@ -2459,7 +2468,7 @@
     TEST_ASSERT( mbedtls_test_message_queue_pop_info( NULL, 1 )
                  == MBEDTLS_TEST_ERROR_ARG_NULL );
 
-    mbedtls_test_message_queue_setup( &queue, 3 );
+    TEST_ASSERT( mbedtls_test_message_queue_setup( &queue, 3 ) == 0 );
     TEST_ASSERT( queue.capacity == 3 );
     TEST_ASSERT( queue.num == 0 );
 
@@ -2473,7 +2482,7 @@
 {
     mbedtls_test_message_queue queue;
 
-    mbedtls_test_message_queue_setup( &queue, 3 );
+    TEST_ASSERT( mbedtls_test_message_queue_setup( &queue, 3 ) == 0 );
 
     /* Sanity test - 3 pushes and 3 pops with sufficient space */
     TEST_ASSERT( mbedtls_test_message_queue_push_info( &queue, 1 ) == 1 );
@@ -2500,7 +2509,7 @@
 {
     mbedtls_test_message_queue queue;
 
-    mbedtls_test_message_queue_setup( &queue, 3 );
+    TEST_ASSERT( mbedtls_test_message_queue_setup( &queue, 3 ) == 0 );
 
     /* 4 pushes (last one with an error), 4 pops (last one with an error) */
     TEST_ASSERT( mbedtls_test_message_queue_push_info( &queue, 1 ) == 1 );
@@ -2526,7 +2535,7 @@
 {
     mbedtls_test_message_queue queue;
 
-    mbedtls_test_message_queue_setup( &queue, 3 );
+    TEST_ASSERT( mbedtls_test_message_queue_setup( &queue, 3 ) == 0 );
 
     /* Interleaved test - [2 pushes, 1 pop] twice, and then two pops
      * (to wrap around the buffer) */
@@ -2562,7 +2571,7 @@
     size_t message_len = 10;
     size_t buffer_len = 5;
 
-    mbedtls_test_message_queue_setup( &queue, 1 );
+    TEST_ASSERT( mbedtls_test_message_queue_setup( &queue, 1 ) == 0 );
 
     /* Popping without a sufficient buffer */
     TEST_ASSERT( mbedtls_test_message_queue_push_info( &queue, message_len )
@@ -2582,6 +2591,8 @@
     mbedtls_mock_socket client, server;
     mbedtls_test_message_queue server_queue, client_queue;
     mbedtls_test_message_socket_context server_context, client_context;
+    mbedtls_message_socket_init( &server_context );
+    mbedtls_message_socket_init( &client_context );
 
     /* Send with a NULL context */
     TEST_ASSERT( mbedtls_mock_tcp_send_msg( NULL, message, MSGLEN )
@@ -2627,6 +2638,8 @@
     unsigned i;
     mbedtls_test_message_queue server_queue, client_queue;
     mbedtls_test_message_socket_context server_context, client_context;
+    mbedtls_message_socket_init( &server_context );
+    mbedtls_message_socket_init( &client_context );
 
     TEST_ASSERT( mbedtls_message_socket_setup( &server_queue, &client_queue, 1,
                                                &server,
@@ -2680,6 +2693,8 @@
     unsigned i;
     mbedtls_test_message_queue server_queue, client_queue;
     mbedtls_test_message_socket_context server_context, client_context;
+    mbedtls_message_socket_init( &server_context );
+    mbedtls_message_socket_init( &client_context );
 
     TEST_ASSERT( mbedtls_message_socket_setup( &server_queue, &client_queue, 2,
                                                &server,
@@ -2736,6 +2751,8 @@
     unsigned i;
     mbedtls_test_message_queue server_queue, client_queue;
     mbedtls_test_message_socket_context server_context, client_context;
+    mbedtls_message_socket_init( &server_context );
+    mbedtls_message_socket_init( &client_context );
 
     TEST_ASSERT( mbedtls_message_socket_setup( &server_queue, &client_queue, 2,
                                                &server,
@@ -2783,6 +2800,8 @@
     unsigned i;
     mbedtls_test_message_queue server_queue, client_queue;
     mbedtls_test_message_socket_context server_context, client_context;
+    mbedtls_message_socket_init( &server_context );
+    mbedtls_message_socket_init( &client_context );
 
     TEST_ASSERT( mbedtls_message_socket_setup( &server_queue, &client_queue, 2,
                                                &server,
@@ -2840,6 +2859,8 @@
     unsigned i;
     mbedtls_test_message_queue server_queue, client_queue;
     mbedtls_test_message_socket_context server_context, client_context;
+    mbedtls_message_socket_init( &server_context );
+    mbedtls_message_socket_init( &client_context );
 
     TEST_ASSERT( mbedtls_message_socket_setup( &server_queue, &client_queue, 1,
                                                &server,
@@ -2892,6 +2913,8 @@
     unsigned i;
     mbedtls_test_message_queue server_queue, client_queue;
     mbedtls_test_message_socket_context server_context, client_context;
+    mbedtls_message_socket_init( &server_context );
+    mbedtls_message_socket_init( &client_context );
 
     TEST_ASSERT( mbedtls_message_socket_setup( &server_queue, &client_queue, 3,
                                                &server,
@@ -2950,6 +2973,8 @@
     unsigned i;
     mbedtls_test_message_queue server_queue, client_queue;
     mbedtls_test_message_socket_context server_context, client_context;
+    mbedtls_message_socket_init( &server_context );
+    mbedtls_message_socket_init( &client_context );
 
     TEST_ASSERT( mbedtls_message_socket_setup( &server_queue, &client_queue, 3,
                                                &server,