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x/crypto/openpgp: ReadArmoredKeyRing: unsupported feature: unknown critical signature subpacket type 6 #20686

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dolmen opened this issue Jun 15, 2017 · 8 comments
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FrozenDueToAge help wanted NeedsFix The path to resolution is known, but the work has not been done.
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@dolmen
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dolmen commented Jun 15, 2017

What version of Go are you using (go version)?

go1.8.3
golang.org/x/crypto latest (commit 850760c June 13th, 2017)

What operating system and processor architecture are you using (go env)?

linux/amd64

What did you do?

Parse a public key using golang.org/x/crypto/openpgp
Full test code including the failing key (well known key working with GPG):

package main

import (
	"log"
	"strings"

	"golang.org/x/crypto/openpgp"
)

const keytext = `
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: SKS 1.1.5
Comment: Hostname: pgp.mit.edu

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=SbNu
-----END PGP PUBLIC KEY BLOCK-----
`

func main() {
	_, err := openpgp.ReadArmoredKeyRing(strings.NewReader(keytext))
	if err != nil {
		log.Fatalf("%T %s", err, err)
	}
	log.Print("OK.")
}

What did you expect to see?

2017/06/15 12:07:57 OK.

What did you see instead?

2017/06/15 12:07:57 errors.UnsupportedError openpgp: unsupported feature: unknown critical signature subpacket type 6
exit status 1

It looks like keybase has worked on this issue and may have a partial fix or maybe just a workaround. See keybase/go-crypto#17

@dolmen dolmen changed the title openpgp: unsupported feature: unknown critical signature subpacket type 6 openpgp.ReadArmoredKeyRing: unsupported feature: unknown critical signature subpacket type 6 Jun 15, 2017
@bradfitz bradfitz changed the title openpgp.ReadArmoredKeyRing: unsupported feature: unknown critical signature subpacket type 6 x/crypto/openpgp: ReadArmoredKeyRing: unsupported feature: unknown critical signature subpacket type 6 Jun 15, 2017
@gopherbot gopherbot added this to the Unreleased milestone Jun 15, 2017
@bradfitz bradfitz added help wanted NeedsFix The path to resolution is known, but the work has not been done. labels Jun 15, 2017
dolmen added a commit to dolmen-go/CPAN that referenced this issue Jun 16, 2017
Unfortunately this doesn't work because the openpgp doesn't fully
implement parsing of this keyring.
See golang/go#20686
dolmen added a commit to dolmen-go/CPAN that referenced this issue Jun 16, 2017
openpgp.ReadEntity is inlined and adapted to bypass the unsupported
packets.
@SCKelemen
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@SCKelemen

@bradfitz
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bradfitz commented Jul 7, 2017

@SCKelemen, what do you mean by writing your name on a bunch of bugs like this?

@SCKelemen
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@bradfitz I want to watch the issue, so it comes up in my notifications involving me. If these issues aren't being worked on, I can try and take them on in my 20% time.

@bradfitz
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bradfitz commented Jul 7, 2017

Can't you just hit the Subscribe button in the right sidebar?

@SCKelemen
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I'm already subscribed, just overwhelmed by all of the notifications. I'll take some time and unfollow all the other issues

@cespare
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cespare commented Jul 7, 2017

@SCKelemen I suggest finding some other way of writing down the issues you intend to look at later. For example, personally, I keep them organized in a few folders with my other bookmarks.

Writing comments on issues updates a lot of people so it's not a good way to keep track of things for yourself.

@bradfitz
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bradfitz commented Jul 7, 2017

I asked why you're dropping your name in places, and you said "to watch the issue". I then asked why you don't subscribe to it, and you said you get too many notifications. I'm confused.

@FiloSottile
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Per the accepted #44226 proposal and due to lack of maintenance, the golang.org/x/crypto/openpgp package is now frozen and deprecated. No new changes will be accepted except for security fixes. The package will not be removed.

If this is a security issue, please email security@golang.org and we will assess it and provide a fix.

If you're looking for alternatives, consider the crypto/ed25519 package for simple signatures, golang.org/x/mod/sumdb/note for inline signatures, or filippo.io/age for encryption. You can read a summary of OpenPGP issues and alternatives here.

If you are required to interoperate with OpenPGP systems and need a maintained package, we suggest considering one of multiple community forks of golang.org/x/crypto/openpgp. We don't endorse any specific one.

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