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Usage of UTF-8 NFKD

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slush0 2014-02-07 21:01:10 +01:00
parent 6a3bb51e3f
commit 041f51c2ff
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@ -78,7 +78,8 @@ c) sorted wordlists
(i.e. implementation can use binary search instead of linear search) (i.e. implementation can use binary search instead of linear search)
- this also allows trie (prefix tree) to be used, e.g. for better compression - this also allows trie (prefix tree) to be used, e.g. for better compression
The wordlist can contain native characters, but they have to be encoded using UTF-8. The wordlist can contain native characters, but they have to be encoded in UTF-8
using Normalization Form Compatibility Decomposition (NFKD).
==From mnemonic to seed== ==From mnemonic to seed==
@ -86,8 +87,8 @@ A user may decide to protect their mnemonic by passphrase. If a passphrase is no
present, an empty string "" is used instead. present, an empty string "" is used instead.
To create a binary seed from the mnemonic, we use PBKDF2 function with a mnemonic To create a binary seed from the mnemonic, we use PBKDF2 function with a mnemonic
sentence (in UTF-8) used as a password and string "mnemonic" + passphrase (again sentence (in UTF-8 NFKD) used as a password and string "mnemonic" + passphrase (again
in UTF-8) used as a salt. Iteration count is set to 2048 and HMAC-SHA512 is used as in UTF-8 NFKD) used as a salt. Iteration count is set to 2048 and HMAC-SHA512 is used as
a pseudo-random function. Desired length of the derived key is 512 bits (= 64 bytes). a pseudo-random function. Desired length of the derived key is 512 bits (= 64 bytes).
This seed can be later used to generate deterministic wallets using BIP-0032 or This seed can be later used to generate deterministic wallets using BIP-0032 or