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recover keys.

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This commit is contained in:
Christopher Jeffrey 2016-02-18 02:22:06 -08:00
parent e68bab4ab3
commit a6b1e8bdb0
1 changed files with 49 additions and 15 deletions
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64
lib/bcoin/script.js
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@ -1740,6 +1740,23 @@ script.getOuputMN = function getOuputMN(s) {
return { m: 1, n: 1 };
};
script.recoverKey = function recoverKey(sig, msg) {
var key;
try {
key = bcoin.ecdsa.recoverPubKey(msg, sig.slice(0, -1), 0);
} catch (e) {
return;
}
return bcoin.ecdsa.keyPair({ pub: key }).getPublic(true, 'array');
};
script.guessKey = function guessKey(sig, prev, tx, i) {
var msg = tx.signatureHash(i, prev, sig[sig.length - 1]);
return script.recoverKey(sig, msg);
};
script.isPubkey = function isPubkey(s, key) {
var res;
@ -1894,7 +1911,7 @@ script.getInputType = function getInputType(s, prev) {
|| null;
};
script.isPubkeyInput = function isPubkeyInput(s, key, tx, i) {
script.isPubkeyInput = function isPubkeyInput(s, key, tx, index) {
if (s.length !== 1)
return false;
@ -1906,11 +1923,17 @@ script.isPubkeyInput = function isPubkeyInput(s, key, tx, i) {
// This will only work if the script verifies.
if (key) {
assert(tx);
assert(i != null);
if (!script.verify(s, [key, 'checksig'], tx, i))
assert(index != null);
if (!script.verify(s, [key, 'checksig'], tx, index))
return false;
}
// if (key) {
// var recovered;
// recovered = script.guessKey(s[0], [key, 'checksig'], tx, index);
// return utils.isEqual(key, recovered || []);
// }
return true;
};
@ -1932,8 +1955,8 @@ script.isPubkeyhashInput = function isPubkeyhashInput(s, key) {
return true;
};
script.isMultisigInput = function isMultisigInput(s, keys, tx, i) {
var i, o;
script.isMultisigInput = function isMultisigInput(s, keys, tx, index) {
var i, prev;
// We need to rule out scripthash because
// it may look like multisig. This is
@ -1959,20 +1982,31 @@ script.isMultisigInput = function isMultisigInput(s, keys, tx, i) {
if (keys) {
assert(keys.length >= 2);
assert(tx);
assert(i != null);
o = script.createMultisig(keys, s.length - 1, keys.length);
if (!script.verify(s, o, tx, i))
assert(index != null);
prev = script.createMultisig(keys, s.length - 1, keys.length);
if (!script.verify(s, prev, tx, index))
return false;
}
// We also also try to recover the keys from the signatures.
// var recovered = [];
// for (i = 1; i < s.length; i++) {
// var sig = s[i];
// var prev = script.createMultisig(keys, s.length - 1, keys.length);
// var msg = tx.signatureHash(i, prev, s[s.length - 1]);
// var key = bcoin.ecdsa.recoverPubKey(msg, sig.slice(0, -1), 0).toArray();
// recovered.push(key);
// if (keys) {
// var prev, recovered, j, total;
// recovered = [];
// total = 0;
// for (i = 1; i < s.length; i++) {
// prev = script.createMultisig(keys, s.length - 1, keys.length);
// recovered.push(script.guessKey(s[i], prev, tx, index) || []);
// }
// for (i = 0; i < recovered.length; i++) {
// for (j = 0; j < keys.length; j++) {
// if (utils.isEqual(recovered[i], keys[j])) {
// total++;
// break;
// }
// }
// }
// if (total !== s.length - 1)
// return false;
// }
return true;