@ledgerhq/coin-algorand/lib-es/logic/combine.js

Ledger Algorand Coin integration

import { decodeUnsignedTransaction, encodeMsgpack, SignedTransaction } from "algosdk";
const ED25519_SIGNATURE_LENGTH = 64;
/**
 * Combine an unsigned transaction with a signature
 * @param unsignedTx - The unsigned transaction as a hex string (msgpack encoded)
 * @param signature - The signature as a hex string
 * @returns The signed transaction as a hex string
 */
export function combine(unsignedTx, signature) {
    const txBytes = Buffer.from(unsignedTx, "hex");
    const txn = decodeUnsignedTransaction(txBytes);
    const sig = Buffer.from(signature, "hex").subarray(0, ED25519_SIGNATURE_LENGTH);
    const signedPayload = new SignedTransaction({ sig, txn });
    const msgPackEncoded = encodeMsgpack(signedPayload);
    return Buffer.from(msgPackEncoded).toString("hex");
}
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