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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/@bitgo/utxo-core/dist/src/testutil

Просмотр файла: trimMessagePrefix.js

"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
exports.trimMessagePrefix = trimMessagePrefix;
const utxolib = __importStar(require("@bitgo/utxo-lib"));
/** We receive a proof in the form:
 * 0x18Bitcoin Signed Message:\n<varint_length><ENTROPY><ADDRESS><UUID>
 * and when verifying our message we want to exclude the 0x18Bitcoin Signed Message:\n<varint_length>
 * of the proof so that we are left with the entropy address and uuid as our message.
 * This is what we are going to be verifying.
 *
 * @param proof
 * @returns
 */
function trimMessagePrefix(proof) {
    const prefix = '\u0018Bitcoin Signed Message:\n';
    if (proof.toString().startsWith(prefix)) {
        proof = proof.slice(Buffer.from(prefix).length);
        utxolib.bufferutils.varuint.decode(proof, 0);
        // Determines how many bytes were consumed during our last varuint.decode(Buffer, offset)
        // So if varuint.decode(0xfd) then varuint.decode.bytes = 3
        // varuint.decode(0xfe) then varuint.decode.bytes = 5, etc.
        const varintBytesLength = utxolib.bufferutils.varuint.decode.bytes;
        proof.slice(varintBytesLength);
    }
    return proof;
}
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