@ledgerhq/hw-app-btc
Version:
Ledger Hardware Wallet Bitcoin Application API
75 lines • 3.63 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.getDerivationAccessors = getDerivationAccessors;
exports.checkElementBip32Derivation = checkElementBip32Derivation;
exports.extractAccountPath = extractAccountPath;
exports.checkBip32Derivation = checkBip32Derivation;
exports.checkOutputBip32Derivation = checkOutputBip32Derivation;
const psbtv2_1 = require("@ledgerhq/psbtv2");
/**
* Returns accessors for BIP32 derivation operations based on element type.
*/
function getDerivationAccessors(psbt, type) {
if (type === "input") {
return {
getKeyDatas: (i, kt) => psbt.getInputKeyDatas(i, kt),
getBip32Derivation: (i, pk) => psbt.getInputBip32Derivation(i, pk),
getTapBip32Derivation: (i, pk) => psbt.getInputTapBip32Derivation(i, pk),
setBip32Derivation: (i, pk, fp, p) => psbt.setInputBip32Derivation(i, pk, fp, p),
setTapBip32Derivation: (i, pk, h, fp, p) => psbt.setInputTapBip32Derivation(i, pk, h, fp, p),
bip32KeyType: psbtv2_1.psbtIn.BIP32_DERIVATION,
tapBip32KeyType: psbtv2_1.psbtIn.TAP_BIP32_DERIVATION,
};
}
return {
getKeyDatas: (i, kt) => psbt.getOutputKeyDatas(i, kt),
getBip32Derivation: (i, pk) => psbt.getOutputBip32Derivation(i, pk),
getTapBip32Derivation: (i, pk) => psbt.getOutputTapBip32Derivation(i, pk),
setBip32Derivation: (i, pk, fp, p) => psbt.setOutputBip32Derivation(i, pk, fp, p),
setTapBip32Derivation: (i, pk, h, fp, p) => psbt.setOutputTapBip32Derivation(i, pk, h, fp, p),
bip32KeyType: psbtv2_1.psbtOut.BIP_32_DERIVATION,
tapBip32KeyType: psbtv2_1.psbtOut.TAP_BIP32_DERIVATION,
};
}
/**
* Generic method to check BIP32 derivation for either an input or output.
*/
function checkElementBip32Derivation(accessors, elementIndex, masterFp) {
const keyDatas = accessors.getKeyDatas(elementIndex, accessors.bip32KeyType);
for (const pubkey of keyDatas) {
const derivationInfo = accessors.getBip32Derivation(elementIndex, pubkey);
if (derivationInfo?.masterFingerprint.equals(masterFp)) {
return extractAccountPath(derivationInfo.path);
}
}
const tapKeyDatas = accessors.getKeyDatas(elementIndex, accessors.tapBip32KeyType);
for (const pubkey of tapKeyDatas) {
const derivationInfo = accessors.getTapBip32Derivation(elementIndex, pubkey);
if (derivationInfo?.masterFingerprint.equals(masterFp)) {
return extractAccountPath(derivationInfo.path);
}
}
return { belongsToSigner: false, accountPath: [] };
}
/**
* Returns belongsToSigner: true because this function is only called after
* a master fingerprint match against the connected signer (hardware wallet).
* This is unrelated to the BIP44 "internal chain" (change = 1) concept.
*/
function extractAccountPath(fullPath) {
const accountPath = fullPath.length >= 2 ? fullPath.slice(0, -2) : [];
return { belongsToSigner: true, accountPath };
}
function checkBip32Derivation(psbt, inputIndex, masterFp) {
const accessors = getDerivationAccessors(psbt, "input");
return checkElementBip32Derivation(accessors, inputIndex, masterFp);
}
/**
* Checks if an output has a valid BIP32 derivation with the correct master fingerprint.
*/
function checkOutputBip32Derivation(psbt, outputIndex, masterFp) {
const accessors = getDerivationAccessors(psbt, "output");
const result = checkElementBip32Derivation(accessors, outputIndex, masterFp);
return result.belongsToSigner;
}
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