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Derivation Path errors are detected.

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This commit is contained in:
Ian Coleman
2016-08-15 16:03:01 +10:00
parent 38523d36dc
commit 30c9e79de3
2 changed files with 66 additions and 2 deletions
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34
bip39-standalone.html
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@@ -14838,7 +14838,39 @@ var Mnemonic = function(language) {
}
function findDerivationPathErrors(path) {
// TODO
// TODO is not perfect but is better than nothing
// Inspired by
// https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki#test-vectors
// and
// https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki#extended-keys
var maxDepth = 255; // TODO verify this!!
var maxIndexValue = Math.pow(2, 31); // TODO verify this!!
if (path[0] != "m") {
return "First character must be 'm'";
}
if (path.length > 1) {
if (path[1] != "/") {
return "Separator must be '/'";
}
var indexes = path.split("/");
if (indexes.length > maxDepth) {
return "Derivation depth is " + indexes.length + ", must be less than " + maxDepth;
}
for (var depth = 1; depth<indexes.length; depth++) {
var index = indexes[depth];
var invalidChars = index.replace(/^[0-9]+'?$/g, "")
if (invalidChars.length > 0) {
return "Invalid characters " + invalidChars + " found at depth " + depth;
}
var indexValue = parseInt(index.replace("'", ""));
if (isNaN(depth)) {
return "Invalid number at depth " + depth;
}
if (indexValue > maxIndexValue) {
return "Value of " + indexValue + " at depth " + depth + " must be less than " + maxIndexValue;
}
}
}
return false;
}