Aligns go protoc toolset

encryption/testprotos/generate.sh

@@ -1,2 +1,28 @@
 #!/bin/bash
-protoc -I testprotos/ testprotos/testproto.proto --go_out=.
+set -e
+
+if ! which realpath > /dev/null 2>&1
+then
+  echo realpath is not installed
+  echo run: brew install coreutils
+  exit 1
+fi
+
+old_pwd=$(pwd)
+script_path=$(dirname "$(realpath "$0")")
+cd "$script_path/.."
+
+repo_root=$(git rev-parse --show-toplevel)
+# shellcheck source=/dev/null
+. "$repo_root/proto-tools.env"
+
+actual_protoc=$(protoc --version | awk '{print $2}')
+if [ "$actual_protoc" != "$PROTOC_VERSION" ]; then
+  echo "ERROR: protoc version $actual_protoc differs from pinned $PROTOC_VERSION" >&2
+  echo "Install protoc $PROTOC_VERSION from https://github.com/protocolbuffers/protobuf/releases" >&2
+  exit 1
+fi
+
+go install "google.golang.org/protobuf/cmd/protoc-gen-go@${PROTOC_GEN_GO_VERSION}"
+protoc -I testprotos/ testprotos/testproto.proto --go_out=.
+cd "$old_pwd"