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check entropyBytes for ENT constraints, for readability

This commit is contained in:
Daniel Cousens 2017-05-12 13:03:39 +10:00
parent e908612959
commit c1e80936ac
1 changed files with 2 additions and 3 deletions
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5
index.js
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@ -68,9 +68,6 @@ function mnemonicToEntropy (mnemonic, wordlist) {
return lpad(index.toString(2), '0', 11)
}).join('')
if (bits.length < 128) throw new Error(INVALID_MNEMONIC)
if (bits.length > 264) throw new Error(INVALID_MNEMONIC)
// split the binary string into ENT/CS
var dividerIndex = Math.floor(bits.length / 33) * 32
var entropyBits = bits.slice(0, dividerIndex)
@ -78,6 +75,8 @@ function mnemonicToEntropy (mnemonic, wordlist) {
// calculate the checksum and compare
var entropyBytes = entropyBits.match(/(.{1,8})/g).map(binaryToByte)
if (entropyBytes.length < 16) throw new Error(INVALID_ENTROPY)
if (entropyBytes.length > 32) throw new Error(INVALID_ENTROPY)
if (entropyBytes.length % 4 !== 0) throw new Error(INVALID_ENTROPY)
var entropy = new Buffer(entropyBytes)