在 npm 中使用 cbor 模組正確解析合約創建字節碼元數據雜湊

我想建立一個像 etherscan 這樣的智能合約驗證服務。在嘗試對etherscan進行一些驗證測試時，我了解到部署的合約區塊鏈字節碼與驗證字節碼不同，不同的部分是cbor編碼的元數據雜湊。

solidity(single file)當我們選擇或solidity(multi-part files)選項時，似乎 etherscan 僅使用執行時字節碼進行驗證。所以我想區分執行時字節碼和元數據雜湊進行驗證。但是元數據雜湊模式因solidity編譯器版本而異。IE; 有些以 開頭0xa264，有些以 開頭，有些以0xa265開頭0xa165我聽說要正確解析元數據雜湊，需要使用 cbor 解碼庫，我認為它是cbornpm 中的模組。

問題是解碼編碼數據存在限制。

我能夠使用以下程式碼解碼小於 16KB 的數據。

const cbor = require("cbor");

const bytecode =
 "a265627a7a72315820fff71e99591635249f5accf8c30eb5471092d1f9968bdd68eafc0de58687dc8e64736f6c63430005100032";

console.log(cbor.decodeAllSync(bytecode));

並得到了這樣的結果。

[
 {
   bzzr1: <Buffer ff f7 1e 99 59 16 35 24 9f 5a cc f8 c3 0e b5 47 10 92 d1 f9 96 8b dd 68 ea fc 0d e5 86 87 dc 8e>,
   solc: <Buffer 00 05 10>
 },
 0,
 -19
]

但是當我試圖解碼整個字節碼時，上面的程式碼不起作用。

這是我嘗試過的編碼數據。

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該編碼數據大小為 23KB。

總結一下，

1. 我可以像這樣區分執行時字節碼和元數據雜湊嗎？
2. 如果正確，如何區分執行時字節碼和元數據雜湊，如果不正確，如何獲取所有 Solidity 版本的執行時字節碼？

字節碼作為一個整體不是 CBOR 編碼的。只有最後代表元數據雜湊的部分是並且您似乎正確解碼它。至於為什麼它可以以 開頭0xa264，0xa265或者其他什麼，請參閱我之前對“如何在不同的 Solidity 版本上驗證智能合約”的回答。

我可以像這樣區分執行時字節碼和元數據雜湊嗎

好吧，這是您必須採用的方法才能驗證某些契約（具有扁平源或由早期版本的編譯器生成的契約），但最好是您可以驗證整個字節碼，包括元數據雜湊。要將其複製到該級別，您應該要求使用者送出用於建構契約的標準 JSON 輸入或源+完整元數據（其雜湊附加到字節碼的 JSON 數據）。忽略元數據的驗證沒有那麼嚴格，並且很樂意接受以多種方式修改的源 - 重命名契約或變數，更改優化的部分，更改註釋，許可資訊等。請參閱契約元數據 > 原始碼驗證的使用。

如果正確，如何區分執行時字節碼和元數據雜湊，如果不正確，如何獲取所有 Solidity 版本的執行時字節碼？

我不確定“執行時字節碼”是否實際上是指執行時字節碼，而不是創建字節碼或只是創建程式碼，這是您從編譯器獲得的。我假設您的意思是後者，因為實際的執行時程式碼是動態生成的，在一般情況下，您必須執行創建程式碼才能獲得它。

如果您的意思是創建程式碼，那麼除了 CBOR 編碼的元數據之外的所有內容都會在最後進行雜湊處理。如果我們談論的是您從事務數據（而不是編譯器輸出）獲得的字節碼，那麼在 CBOR 數據之後還會附加建構子參數。

引用自：https://ethereum.stackexchange.com/questions/111909