Got an error "Unexpected packet type: 6"

[mhonjester]

I encountered an error "Unexpected packet type: 6" when decrypting this private key, please help. I'm currently using OpenPGP v5.11.1 and I think the private key mentioned below is generated and being used with OpenPGPV4.5.2

PrivateKey:
-----BEGIN PGP PRIVATE KEY BLOCK-----
Version: BCPG v1.56

lQOBBF1CeRURCAC39oDHju9fvoQutDM4rnHjxxuqbz+/qQayG+7z8JalOwOCNFqt
P6BsT6/n+Dn+bNzOT21bL5iMfzwThqerqDcVmHt3Ff2BXkpKB8X2QyuVxhP5iBqW
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OIDig6ynkQ==
=X+rI
-----END PGP PRIVATE KEY BLOCK-----

Here's the error message

Here's my code

[twiss]

Hi 👋 This private key block contains both the private key and the public key (packet type 6 is a public-key packet, which is considered unexpected in a private key block). Perhaps we should allow this, but as a workaround, you can use readKey instead of readPrivateKey.

[mhonjester]

@twiss I tried using readKey and it still gives me the same error "Unexpected packet type: 6. Is there any config that I should add ?

Additional info: When I'm using openpgp v4.4.7(version we are using before we upgrade to 5) we are able to decrypt this, we just encountered another issue when using that version in lambda (node 18 runtime) and the only error that shows in lambda is mentioned below.

We decided to upgrade it to v5 since we don't have any idea on how to resolve the issue we encountered on lambda since the error is so vague. After upgrading to v5, we are able to resolve the error mentioned below in lambda but we encountered another issue Unexpected packet type 6

NOTE: The issue that is mentioned below (Decryption error) is encountered to a different private key and file so the given file and private key above will success when using v4.4.7.

Error decrypting message: Decryption error
at Object.nodeDecrypt (/opt/node_modules/openpgp/dist/openpgp.js:31545:13)
at Object.decrypt (/opt/node_modules/openpgp/dist/openpgp.js:31197:19)
at Object.publicKeyDecrypt (/opt/node_modules/openpgp/dist/openpgp.js:27221:43)
at PublicKeyEncryptedSessionKey.decrypt (/opt/node_modules/openpgp/dist/openpgp.js:39819:42)
at /opt/node_modules/openpgp/dist/openpgp.js:36277:29
at Array.map ()
at /opt/node_modules/openpgp/dist/openpgp.js:36269:45
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async Promise.all (index 0)
at async /opt/node_modules/openpgp/dist/openpgp.js:36254:7
at async Promise.all (index 0)
at async Message.decryptSessionKeys (/opt/node_modules/openpgp/dist/openpgp.js:36253:5)
at async Message.decrypt (/opt/node_modules/openpgp/dist/openpgp.js:36177:35)

[twiss]

Ah right, apologies. Since it contains multiple keys you need to use readKeys. Then you can simply take the first key from the returned array.

[mhonjester]

@twiss Awesome, it now works!!. Thanks a lot for your help

[packcode]

Hi @twiss I am also getting the same error Unexpected packet type: 6 while decrypting.
and changed my code to readKeys instead of readPrivateKey as you have suggested, Now getting a different error

throw new Error('No key or password specified.').
Error: Error decrypting message: No key or password specified.

Here is my code snippet

const privateKey = await openpgp.readKeys({
  armoredKeys: privateKeyArmored,
});
const { data: decryptedData } = await openpgp.decrypt({
  message: await openpgp.readMessage({ binaryMessage: encryptedData }),
  decryptionKeys: privateKey.keys[0],
  format: 'binary',
});

using "openpgp": "^5.11.1",

[twiss]

Hey 👋 Sorry for the late reply. readKeys returns an array in OpenPGP.js v5, so you just need privateKey[0] instead of privateKey.keys[0] :)