Are AUR packages signed? How do I check the signature if they are?

Hi,
Are AUR packages signed? How do I check the signature if they are?
Thank you!

andreicristianpetcu wrote:Thank you for your answers! Some Aur packages basically wget some tar.gz and uncompress it and I wanted to know if there is a way to test if this is the same archive that I wanted to install.
Archives downloaded by PKGBUILDs are never the same as the archive you want to install. Are you referring to PKGBUILDs which just repackage .deb or .rpm archives? As mentioned, there's checksums (typically of zero benefit to security), and sometimes GPG signatures provided by upstream. But, this is only a part of the process. The attack surface is wider than just the source tarball and the PKGBUILD. Consider that you don't even need a PKGBUILD to create a package which pacman understands.
andreicristianpetcu wrote:I told him that this cannot be done on most packages on most GNU/Linux distros.
No, it absolutely can. All operating systems are prone to attack by social engineering and can fall victim to lax system administration. The "Linux doesn't get virii" mantra is a falsehood propagated by people relying on statistics rather than actual operating system features and security practices.
andreicristianpetcu wrote:Since I am a Arch user I wanted to find out if there is a way (except for reading the pkgbuild) from which I can check the validity of the package.
Given an arbitrary archive foo-1-1-x86_64.pkg.tar.xz, there is absolutely no way to determine what PKGBUILD was used to build it. This is a key reason why signing binary packages in the repositories is important!
andreicristianpetcu wrote:From what I know the files from the other repos are signed (correct me if I'm wrong).
Right, in order to assert provenance of a package. If the signature for a package is valid, you can assume that you have a copy of the package which a developer or TU built.

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