Fix decryption support for non-standard, legacy AEAD-encrypted messages and keys that used experimentalGCM from OpenPGP.js v5
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twiss
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Nov 21, 2024
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… deprecated `experimentalGCM` should not be used anymore, as a different a different algorithm ID was standardized for GCM, and using the experimental value could give interoperability issues with e.g. SEIPDv2 and AEAD-encrypted keys.
…s that used `experimentalGCM` This adds back support for decrypting password-protected messages which were encrypted in OpenPGP.js v5 with custom config settings `config.aeadProtect = true` together with `config.preferredAEADAlgorithm = openpgp.enums.aead.experimentalGCM`. Public-key-encrypted messages are affected if they were encrypted using the same config, while also providing `encryptionKeys` that declared `experimentalGCM` in their AEAD prefs. Such keys could be generated in OpenPGP.js v5 by setting the aforementioned config values.
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twiss
approved these changes
Nov 22, 2024
The `enums.aead.gcm` ID standardized by RFC9580 should be used instead.
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This change affects only keys or messages generated using features marked as "experimental" in OpenPGP.js v5.
Messages and keys encrypted with OpenPGP.js v6 are not affected since there was a bug that prevented using the
experimentalGCMalgo; the bug is also fixed in this MR, to e.g. allow decrypting existing entities.See commits for details.