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135 lines
4.6 KiB
Markdown
135 lines
4.6 KiB
Markdown
<!--
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Title: How to verify PGP digital signatures using GnuPG on macOS
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Description: Learn how to verify PGP digital signatures using GnuPG on macOS.
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Author: Sun Knudsen <https://github.com/sunknudsen>
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Contributors: Sun Knudsen <https://github.com/sunknudsen>
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Reviewers:
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Publication date: 2021-03-24T12:40:31.074Z
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Listed: true
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-->
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# How to verify PGP digital signatures using GnuPG on macOS
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[](https://www.youtube.com/watch?v=WnNfunEJdQY "How to verify PGP digital signatures using GnuPG on macOS")
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## Requirements
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- Computer running macOS Catalina or Big Sur
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## Caveats
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- When copy/pasting commands that start with `$`, strip out `$` as this character is not part of the command
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## Setup guide
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### Step 1: install [Homebrew](https://brew.sh/)
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```console
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$ /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
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$ uname -m | grep arm64 && echo 'export PATH=$PATH:/opt/homebrew/bin' >> ~/.zshrc && source ~/.zshrc
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```
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### Step 2: disable Homebrew analytics
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```shell
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brew analytics off
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```
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### Step 3: install [GnuPG](https://gnupg.org/)
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```shell
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brew install gnupg
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```
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👍
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---
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## Usage guide
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### Import signer’s public key using key server…
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Replace `0xC1323A377DE14C8B` with signer’s public key ID.
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```console
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$ gpg --keyserver hkps://keys.openpgp.org --recv-keys 0xC1323A377DE14C8B
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gpg: key 0xC1323A377DE14C8B: public key "Sun Knudsen <hello@sunknudsen.com>" imported
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gpg: Total number processed: 1
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gpg: imported: 1
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```
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imported: 1
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👍
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### …or using public key URL
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Replace `https://sunknudsen.com/sunknudsen.asc` with signer’s public key URL.
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```console
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$ curl https://sunknudsen.com/sunknudsen.asc | gpg --import
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% Total % Received % Xferd Average Speed Time Time Time Current
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Dload Upload Total Spent Left Speed
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100 6896 100 6896 0 0 11589 0 --:--:-- --:--:-- --:--:-- 11570
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gpg: key 0xC1323A377DE14C8B: public key "Sun Knudsen <hello@sunknudsen.com>" imported
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gpg: Total number processed: 1
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gpg: imported: 1
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```
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imported: 1
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👍
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### Verify signer’s public key using fingerprint
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Replace `hello@sunknudsen.com` with signer’s email and use published fingerprints or web of trust to verify signer’s fingerprint (see [example](../how-to-encrypt-sign-and-decrypt-messages-using-gnupg-on-macos#verify-suns-pgp-public-key-using-its-fingerprint)).
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```console
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$ gpg --fingerprint hello@sunknudsen.com
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gpg: checking the trustdb
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gpg: marginals needed: 3 completes needed: 1 trust model: pgp
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gpg: depth: 0 valid: 1 signed: 0 trust: 0-, 0q, 0n, 0m, 0f, 1u
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pub rsa4096 2019-10-17 [C]
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C4FB DDC1 6A26 2672 920D 0A0F C132 3A37 7DE1 4C8B
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uid [ unknown] Sun Knudsen <hello@sunknudsen.com>
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sub rsa4096 2019-10-17 [E] [expires: 2021-10-25]
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sub rsa4096 2019-10-17 [A] [expires: 2021-10-25]
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sub rsa4096 2019-10-17 [S] [expires: 2021-10-25]
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```
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### Verify [signed message](https://sunknudsen.com/static/media/cms/donate/donate-bitcoin.asc)
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```console
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$ gpg --verify donate-bitcoin.asc
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gpg: Signature made Sun 7 Mar 14:58:01 2021 EST
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gpg: using RSA key A98CCD122243655B26FAFB611FA767862BBD1305
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gpg: Good signature from "Sun Knudsen <hello@sunknudsen.com>" [unknown]
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gpg: WARNING: This key is not certified with a trusted signature!
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gpg: There is no indication that the signature belongs to the owner.
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Primary key fingerprint: C4FB DDC1 6A26 2672 920D 0A0F C132 3A37 7DE1 4C8B
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Subkey fingerprint: A98C CD12 2243 655B 26FA FB61 1FA7 6786 2BBD 1305
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```
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Good signature
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👍
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### Verify signed [file](https://sunknudsen.com/static/media/privacy-guides/how-to-clean-uninstall-macos-apps-using-appcleaner-open-source-alternative/app-cleaner.sh) using [detached signature](https://sunknudsen.com/static/media/privacy-guides/how-to-clean-uninstall-macos-apps-using-appcleaner-open-source-alternative/app-cleaner.sh.sig)
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```console
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$ gpg --verify app-cleaner.sh.sig
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gpg: assuming signed data in 'app-cleaner.sh'
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gpg: Signature made Wed 17 Mar 09:57:42 2021 EDT
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gpg: using RSA key A98CCD122243655B26FAFB611FA767862BBD1305
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gpg: Good signature from "Sun Knudsen <hello@sunknudsen.com>" [unknown]
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gpg: WARNING: This key is not certified with a trusted signature!
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gpg: There is no indication that the signature belongs to the owner.
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Primary key fingerprint: C4FB DDC1 6A26 2672 920D 0A0F C132 3A37 7DE1 4C8B
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Subkey fingerprint: A98C CD12 2243 655B 26FA FB61 1FA7 6786 2BBD 1305
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```
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Good signature
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👍
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