[PM-24127] Implement password-protected key envelope #335
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…ernal into km/cose-content-format
quexten
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Thomas-Avery
requested changes
Aug 8, 2025
crates/bitwarden-crypto/src/safe/password_protected_key_envelope.rs
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Co-authored-by: Thomas Avery <[email protected]>
Co-authored-by: Thomas Avery <[email protected]>
Co-authored-by: Thomas Avery <[email protected]>
…pe.rs Co-authored-by: Thomas Avery <[email protected]>
…pe.rs Co-authored-by: Thomas Avery <[email protected]>
Co-authored-by: Thomas Avery <[email protected]>
Co-authored-by: Thomas Avery <[email protected]>
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justindbaur
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Aug 12, 2025
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🎟️ Tracking
https://bitwarden.atlassian.net/browse/PM-24127
📔 Objective
The current masterkey logic is complex to understand for using teams (auth), and also prone to error. When any setting changes / gets out of sync, such as the email, or kdf, then decryption fails. The masterkey is further too widely scoped, used both in an authentication protocol, and in unlock decryption.
This PR introduces a PasswordProtectedKeyEnvelope. The goal is to protect a symmetric key with a password securely. Internally, this uses a KDF, and the KDF settings (argon2 parameters, and random salt) are stored on the serialized object.
That means that the only thing needed to unlock this structure is the correct password, everything else is stored on the object, making this process much less error prone. At the same time the interface is easier to use.
An example is provided to show usage.
A follow-up PR will add an unlock method / enrollment for PIN based on this new cryptographic API.
Note: Only argon2 is supported here. The PasswordProtectedKeyEnvelope's settings are completely decoupled from the account settings, and we don't need to provide backwards compatibility to non-recommended legacy cryptographic algorithms (pbkdf2).
⏰ Reminders before review
team
🦮 Reviewer guidelines
:+1:) or similar for great changes:memo:) or ℹ️ (:information_source:) for notes or general info:question:) for questions:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmedissue and could potentially benefit from discussion
:art:) for suggestions / improvements:x:) or:warning:) for more significant problems or concerns needing attention:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt:pick:) for minor or nitpick changes