[build] Sign SHA files and release public key

Closes #6344
Authored by: Grub4K

.github/workflows/build.yml

@@ -30,6 +30,9 @@ on:
       meta_files:
         default: true
         type: boolean
+    secrets:
+      GPG_SIGNING_KEY:
+        required: false
 
   workflow_dispatch:
     inputs:
@@ -330,6 +333,16 @@ jobs:
           lock 2022.08.18.36 .+ Python 3.6
           EOF
 
+      - name: Sign checksum files
+        env:
+          GPG_SIGNING_KEY: ${{ secrets.GPG_SIGNING_KEY }}
+        if: env.GPG_SIGNING_KEY != ''
+        run: |
+          gpg --batch --import <<< "${{ secrets.GPG_SIGNING_KEY }}"
+          for signfile in ./SHA*SUMS; do
+            gpg --batch --detach-sign "$signfile"
+          done
+
       - name: Upload artifacts
         uses: actions/upload-artifact@v3
         with:

.github/workflows/release-nightly.yml

@@ -35,6 +35,8 @@ jobs:
     permissions:
       contents: read
       packages: write # For package cache
+    secrets:
+      GPG_SIGNING_KEY: ${{ secrets.GPG_SIGNING_KEY }}
 
   publish:
     needs: [prepare, build]

.github/workflows/release.yml

@@ -114,6 +114,8 @@ jobs:
     permissions:
       contents: read
       packages: write # For package cache
+    secrets:
+      GPG_SIGNING_KEY: ${{ secrets.GPG_SIGNING_KEY }}
 
   publish:
     needs: [prepare, build]

README.md

@@ -235,9 +235,18 @@ #### Misc
 :---|:---
 [yt-dlp.tar.gz](https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp.tar.gz)|Source tarball
 [SHA2-512SUMS](https://github.com/yt-dlp/yt-dlp/releases/latest/download/SHA2-512SUMS)|GNU-style SHA512 sums
+[SHA2-512SUMS.sig](https://github.com/yt-dlp/yt-dlp/releases/latest/download/SHA2-512SUMS.sig)|GPG signature file for SHA512 sums
 [SHA2-256SUMS](https://github.com/yt-dlp/yt-dlp/releases/latest/download/SHA2-256SUMS)|GNU-style SHA256 sums
-<!-- MANPAGE: END EXCLUDED SECTION -->
+[SHA2-256SUMS.sig](https://github.com/yt-dlp/yt-dlp/releases/latest/download/SHA2-256SUMS.sig)|GPG signature file for SHA256 sums
 
+The public key that can be used to verify the GPG signatures is [available here](https://github.com/yt-dlp/yt-dlp/blob/master/public.key)
+Example usage:
+```
+curl -L https://github.com/yt-dlp/yt-dlp/raw/master/public.key | gpg --import
+gpg --verify SHA2-256SUMS.sig SHA2-256SUMS
+gpg --verify SHA2-512SUMS.sig SHA2-512SUMS
+```
+<!-- MANPAGE: END EXCLUDED SECTION -->
 
 **Note**: The manpages, shell completion files etc. are available in the [source tarball](https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp.tar.gz)
 

public.key

@@ -0,0 +1,29 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
+mQINBGP78C4BEAD0rF9zjGPAt0thlt5C1ebzccAVX7Nb1v+eqQjk+WEZdTETVCg3
+WAM5ngArlHdm/fZqzUgO+pAYrB60GKeg7ffUDf+S0XFKEZdeRLYeAaqqKhSibVal
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+Yo1saY0YWiZWHtzVoZu1kOzjnS5Fjq/yBHJLImDH7pNxHm7s/PnaurpmQFtDFruk
+t+2lhDnpKUmGr/I/3IHqH/X+9nPoS4uiqQ5HpblB8BK+4WfpaiEg75LnvuOPfZIP
+KYyXa/0A7QojMwgOrD88ozT+VCkKkkJ+ijXZ7gHNjmcBaUdKK7fDIEOYI63Lyc6Q
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+U9eqtnxmiV1WQ8nXuI9JgJQRvh5PTkny5LtxqzcmqvWO9TjHBbrs14BPEO9fcXxK
+L/CFBbzXDSvvAgArdqqlMoncQ/yicTlfL6qzJ8EKFiqW14QMTdAn6SuuZTodXCTi
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+jQQsPBqpHHiTBEJzMLl+rfd9Fg4N+QNzpFkTDW3EPerLuvJniSBBwZthqxeAtw4M
+UiAXh6JvCc2hJkKCoygRfM281MeolvmsGNyQm+axlB0vyldiPP6BnaRgZlx+l6MU
+cPqgHblb7RW5j9lfr6OYL7SceBIHNv0CFrt1OnkGo/tVMwcs8LH3Ae4a7UJlIceL
+V54aRxSsZU7w4iX+PB79BWkEsQzwKrUuJVOeL4UDwWajp75OFaUqbS/slDDVXvK5
+OIeuth3mA/adjdvgjPxhRQjA3l69rRWIJDrqBSHldmRsnX6cvXTDy8wSXZgy51lP
+m4IVLHnCy9m4SaGGoAsfTZS0cC9FgjUIyTyrq9M67wOMpUxnuB0aRZgJE1DsI23E
+qdvcSNVlO+39xM/KPWUEh6b83wMn88QeW+DCVGWACQq5N3YdPnAJa50617fGbY6I
+gXIoRHXkDqe23PZ/jURYCv0sjVtjPoVC+bg=
+=bJkn
+-----END PGP PUBLIC KEY BLOCK-----