Derive 256-bit symmetric key using PBKDF2+HMAC-SHA256 with the passphrase + salt as input.
Derive a 256-bit salt using crypto::RandBytes. Passwords must be at least 7 characters and contain at least one number and special character, though we STRONGLY RECOMMEND much longer passphrases. Used the 512bit seed to construct the HD-Wallet using BIP32. Using PBKDF2 + HMAC-SHA512 with 2048 iterations, take the seed from step 2 and the mnemonic from step 1, derive our 512bit seed. Create a salt with the string 'mnemonic'. Using crypto::RandBytes (a BoringSSL source of strong entropy) we derive a 128bit-256bit seed (currently it is configured at 128bits). Protocols Mnemonic and HD Wallet Generation Mnemonics are generated using a Brave maintained hard fork of libwally-core. Mnemonic phrases are encrypted at rest using the AEAD suite AES-256-GCM-SIV with a randomized 96-bit nonce, and an encryption key derived by a user passphrase fed into a key derivation function. The remaining cryptographic wallet functionality is provided by BorringSSL which is used in Chromium in place of OpenSSL (BorringSSL is maintained by Google).Īs in the old MetaMask extension, we adopt BIP-39 mnemonic keywords based on a high entropy seed of 256bits. HD-Wallet uses the bitcoin-core implementations of secp256k1, ripemd160, base58, and BLS12-381. 
These protocols adopt the BIP-32 (HD-Wallet) specification and maintains its own implementation of a Keyring Controller. The native implementation requires less processes to run and may even be extended to support other protocols in the future (e.g. Please note this is different than the old Brave Ethereum wallet based on a fork of MetaMask (wiki can be found here). Brave Wallet is a native Brave Browser implementation of an Ethereum (or any EVM compatible chain) and Filecoin remote client.
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