@ledgerhq/hw-app-btc/lib-es/signMessage.js

Ledger Hardware Wallet Bitcoin Application API

import bippath from "bip32-path";
import { MAX_SCRIPT_BLOCK } from "./constants";
export async function signMessage(transport, { path, messageHex, }) {
    const paths = bippath.fromString(path).toPathArray();
    const message = Buffer.from(messageHex, "hex");
    let offset = 0;
    while (offset !== message.length) {
        const maxChunkSize = offset === 0 ? MAX_SCRIPT_BLOCK - 1 - paths.length * 4 - 4 : MAX_SCRIPT_BLOCK;
        const chunkSize = offset + maxChunkSize > message.length ? message.length - offset : maxChunkSize;
        const buffer = Buffer.alloc(offset === 0 ? 1 + paths.length * 4 + 2 + chunkSize : chunkSize);
        if (offset === 0) {
            buffer[0] = paths.length;
            paths.forEach((element, index) => {
                buffer.writeUInt32BE(element, 1 + 4 * index);
            });
            buffer.writeUInt16BE(message.length, 1 + 4 * paths.length);
            message.copy(buffer, 1 + 4 * paths.length + 2, offset, offset + chunkSize);
        }
        else {
            message.copy(buffer, 0, offset, offset + chunkSize);
        }
        await transport.send(0xe0, 0x4e, 0x00, offset === 0 ? 0x01 : 0x80, buffer);
        offset += chunkSize;
    }
    const res = await transport.send(0xe0, 0x4e, 0x80, 0x00, Buffer.from([0x00]));
    const v = res[0] - 0x30;
    let r = res.slice(4, 4 + res[3]);
    if (r[0] === 0) {
        r = r.slice(1);
    }
    r = r.toString("hex");
    offset = 4 + res[3] + 2;
    let s = res.slice(offset, offset + res[offset - 1]);
    if (s[0] === 0) {
        s = s.slice(1);
    }
    s = s.toString("hex");
    return {
        v,
        r,
        s,
    };
}
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