@@ -72,7 +72,7 @@ go.etcd.io/bbolt                                    232d8fc87f50244f9c808f474575

 # get graph and distribution packages

 github.com/docker/distribution                      0d3efadf0154c2b8a4e7b6621fff9809655cc580

 github.com/vbatts/tar-split                         620714a4c508c880ac1bdda9c8370a2b19af1a55 # v0.11.1

-github.com/opencontainers/go-digest                 279bed98673dd5bef374d3b6e4b09e2af76183bf # v1.0.0-rc1

+github.com/opencontainers/go-digest                 ea51bea511f75cfa3ef6098cc253c5c3609b037a # v1.0.0

 # get go-zfs packages

 github.com/mistifyio/go-zfs                         f784269be439d704d3dfa1906f45dd848fed2beb

new file mode 100644

@@ -0,0 +1,192 @@

+

+                                 Apache License

+                           Version 2.0, January 2004

+                        https://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,

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+      copyright license to reproduce, prepare Derivative Works of,

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+      Work and such Derivative Works in Source or Object form.

+

+   3. Grant of Patent License. Subject to the terms and conditions of

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+      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

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+

+      (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,

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+          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

+

+   Copyright 2019, 2020 OCI Contributors

+   Copyright 2016 Docker, Inc.

+

+   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

+

+       https://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.

deleted file mode 100644

@@ -1,191 +0,0 @@

-

-                                 Apache License

-                           Version 2.0, January 2004

-                        https://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

-

-   Copyright 2016 Docker, Inc.

-

-   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

-

-       https://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.

@@ -8,20 +8,16 @@ Please see the [godoc](https://godoc.org/github.com/opencontainers/go-digest) fo

 # What is a digest?

-A digest is just a hash.

+A digest is just a [hash](https://en.wikipedia.org/wiki/Hash_function).

-The most common use case for a digest is to create a content

-identifier for use in [Content Addressable Storage](https://en.wikipedia.org/wiki/Content-addressable_storage)

-systems:

+The most common use case for a digest is to create a content identifier for use in [Content Addressable Storage](https://en.wikipedia.org/wiki/Content-addressable_storage) systems:

 ```go

 id := digest.FromBytes([]byte("my content"))

 ```

-In the example above, the id can be used to uniquely identify 

-the byte slice "my content". This allows two disparate applications

-to agree on a verifiable identifier without having to trust one

-another.

+In the example above, the id can be used to uniquely identify the byte slice "my content".

+This allows two disparate applications to agree on a verifiable identifier without having to trust one another.

 An identifying digest can be verified, as follows:

@@ -31,8 +27,7 @@ if id != digest.FromBytes([]byte("my content")) {

 }

 ```

-A `Verifier` type can be used to handle cases where an `io.Reader`

-makes more sense:

+A `Verifier` type can be used to handle cases where an `io.Reader` makes more sense:

 ```go

 rd := getContent()

@@ -44,33 +39,28 @@ if !verifier.Verified() {

 }

 ```

-Using [Merkle DAGs](https://en.wikipedia.org/wiki/Merkle_tree), this

-can power a rich, safe, content distribution system.

+Using [Merkle DAGs](https://en.wikipedia.org/wiki/Merkle_tree), this can power a rich, safe, content distribution system.

 # Usage

-While the [godoc](https://godoc.org/github.com/opencontainers/go-digest) is

-considered the best resource, a few important items need to be called 

-out when using this package.

+While the [godoc](https://godoc.org/github.com/opencontainers/go-digest) is considered the best resource, a few important items need to be called out when using this package.

-1. Make sure to import the hash implementations into your application

-    or the package will panic. You should have something like the 

-    following in the main (or other entrypoint) of your application:

+1. Make sure to import the hash implementations into your application or the package will panic.

+    You should have something like the following in the main (or other entrypoint) of your application:

     ```go

     import (

         _ "crypto/sha256"

-   	    _ "crypto/sha512"

+        _ "crypto/sha512"

     )

     ```

     This may seem inconvenient but it allows you replace the hash 

     implementations with others, such as https://github.com/stevvooe/resumable.

-2. Even though `digest.Digest` may be assemable as a string, _always_ 

-    verify your input with `digest.Parse` or use `Digest.Validate`

-    when accepting untrusted input. While there are measures to 

-    avoid common problems, this will ensure you have valid digests

-    in the rest of your application.

+2. Even though `digest.Digest` may be assemblable as a string, _always_ verify your input with `digest.Parse` or use `Digest.Validate` when accepting untrusted input.

+    While there are measures to avoid common problems, this will ensure you have valid digests in the rest of your application.

+

+3. While alternative encodings of hash values (digests) are possible (for example, base64), this package deals exclusively with hex-encoded digests.

 # Stability

@@ -80,25 +70,27 @@ As always, before using a package export, read the [godoc](https://godoc.org/git

 # Contributing

-This package is considered fairly complete. It has been in production

-in thousands (millions?) of deployments and is fairly battle-hardened.

-New additions will be met with skepticism. If you think there is a 

-missing feature, please file a bug clearly describing the problem and 

-the alternatives you tried before submitting a PR.

+This package is considered fairly complete.

+It has been in production in thousands (millions?) of deployments and is fairly battle-hardened.

+New additions will be met with skepticism.

+If you think there is a missing feature, please file a bug clearly describing the problem and the alternatives you tried before submitting a PR.

-# Reporting security issues

+## Code of Conduct

-Please DO NOT file a public issue, instead send your report privately to

-security@opencontainers.org.

+Participation in the OpenContainers community is governed by [OpenContainer's Code of Conduct][code-of-conduct].

-The maintainers take security seriously. If you discover a security issue,

-please bring it to their attention right away!

+## Security

-If you are reporting a security issue, do not create an issue or file a pull

-request on GitHub. Instead, disclose the issue responsibly by sending an email

-to security@opencontainers.org (which is inhabited only by the maintainers of

-the various OCI projects).

+If you find an issue, please follow the [security][security] protocol to report it.

 # Copyright and license

-Copyright © 2016 Docker, Inc. All rights reserved, except as follows. Code is released under the [Apache 2.0 license](LICENSE.code). This `README.md` file and the [`CONTRIBUTING.md`](CONTRIBUTING.md) file are licensed under the Creative Commons Attribution 4.0 International License under the terms and conditions set forth in the file [`LICENSE.docs`](LICENSE.docs). You may obtain a duplicate copy of the same license, titled CC BY-SA 4.0, at http://creativecommons.org/licenses/by-sa/4.0/.

+Copyright © 2019, 2020 OCI Contributors

+Copyright © 2016 Docker, Inc.

+All rights reserved, except as follows.

+Code is released under the [Apache 2.0 license](LICENSE).

+This `README.md` file and the [`CONTRIBUTING.md`](CONTRIBUTING.md) file are licensed under the Creative Commons Attribution 4.0 International License under the terms and conditions set forth in the file [`LICENSE.docs`](LICENSE.docs).

+You may obtain a duplicate copy of the same license, titled CC BY-SA 4.0, at http://creativecommons.org/licenses/by-sa/4.0/.

+

+[security]: https://github.com/opencontainers/org/blob/master/security

+[code-of-conduct]: https://github.com/opencontainers/org/blob/master/CODE_OF_CONDUCT.md

@@ -1,3 +1,4 @@

+// Copyright 2019, 2020 OCI Contributors

 // Copyright 2017 Docker, Inc.

 //

 // Licensed under the Apache License, Version 2.0 (the "License");

@@ -1,3 +1,4 @@

+// Copyright 2019, 2020 OCI Contributors

 // Copyright 2017 Docker, Inc.

 //

 // Licensed under the Apache License, Version 2.0 (the "License");

@@ -1,3 +1,4 @@

+// Copyright 2019, 2020 OCI Contributors

 // Copyright 2017 Docker, Inc.

 //

 // Licensed under the Apache License, Version 2.0 (the "License");

@@ -1,3 +1,4 @@

+// Copyright 2019, 2020 OCI Contributors

 // Copyright 2017 Docker, Inc.

 //

 // Licensed under the Apache License, Version 2.0 (the "License");

@@ -29,8 +30,13 @@

 //

 // 	sha256:7173b809ca12ec5dee4506cd86be934c4596dd234ee82c0662eac04a8c2c71dc

 //

-// In this case, the string "sha256" is the algorithm and the hex bytes are

-// the "digest".

+// The "algorithm" portion defines both the hashing algorithm used to calculate

+// the digest and the encoding of the resulting digest, which defaults to "hex"

+// if not otherwise specified. Currently, all supported algorithms have their

+// digests encoded in hex strings.

+//

+// In the example above, the string "sha256" is the algorithm and the hex bytes

+// are the "digest".

 //

 // Because the Digest type is simply a string, once a valid Digest is

 // obtained, comparisons are cheap, quick and simple to express with the

new file mode 100644

@@ -0,0 +1,3 @@

+module github.com/opencontainers/go-digest

+

+go 1.13

@@ -1,3 +1,4 @@

+// Copyright 2019, 2020 OCI Contributors

 // Copyright 2017 Docker, Inc.

 //

 // Licensed under the Apache License, Version 2.0 (the "License");