Update pinned sigining key

Author: beautifulentropy

tools/fetch-and-verify-go.sh

@@ -14,47 +14,26 @@ PLATFORM="${2:-linux-amd64}"
 
 export GNUPGHOME="$(mktemp -d)"
 
-# From https://www.google.com/linuxrepositories/
+# Import Google's published Linux package signing key bundle.
+# Source: https://dl.google.com/linux/linux_signing_key.pub
 #
-# Key Details
-#   Download: https://dl.google.com/linux/linux_signing_key.pub
-#   Key ID: Google, Inc. Linux Package Signing Key <linux-packages-keymaster@google.com>
-#   Fingerprint: 4CCA 1EAF 950C EE4A B839 76DC A040 830F 7FAC 5991
-#   Google, Inc. (Linux Package Signing Authority) <linux-packages-keymaster@google.com>
-#   Fingerprint: EB4C 1BFD 4F04 2F6D DDCC EC91 7721 F63B D38B 4796
+# You may occasionally need to update the pinned key bundle below. To verify
+# "old block vs new block" is only a subkey update:
+# 1) Make an isolated keyring: `export GNUPGHOME="$(mktemp -d)"`.
+# 2) Save this embedded key block into a file named `old`
+# 3) Import the old key: `gpg --import old`
+#    Then run `gpg --show-keys --with-fingerprint old` and capture the
+#    fingerprint under `pub` as `<old-rsa-primary-fingerprint>`.
+# 4) `curl -fsSL https://dl.google.com/linux/linux_signing_key.pub -o new`,
+#    then `gpg --show-keys --with-fingerprint --with-subkey-fingerprint new`.
+#    Confirm the same `pub` fingerprint and capture the newest `sub`
+#    fingerprint.
+# 5) `gpg --import new` and expect `new subkeys: 1` (and usually
+#    `new signatures: 1`).
+# 6) `gpg --list-keys --with-subkey-fingerprint "<old-rsa-primary-fingerprint>"`
+#     and confirm the newest subkey from step 4 appears.
 gpg2 --import <<EOF
 -----BEGIN PGP PUBLIC KEY BLOCK-----
-Version: GnuPG v1.4.2.2 (GNU/Linux)
-
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-/FJG
-=Quqp
------END PGP PUBLIC KEY BLOCK-----
------BEGIN PGP PUBLIC KEY BLOCK-----
 
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+=4eJy
 -----END PGP PUBLIC KEY BLOCK-----
 EOF