Difference in the decryption results of Node.js, Python and Go: Why does Node.js fail to decrypt AES-128-ECB?

Analysis of the differences and reasons for decryption results of Node.js, Python and Go AES-128-ECB

This paper analyzes the reasons why there are differences in output results when implementing the AES-128-ECB decryption algorithm using three programming languages: Node.js, Python and Go. The code goal of the three languages ​​is consistent - decrypting the same encrypted data, but the decryption result of Node.js does not match the results of Python and Go. Python and Go successfully decrypt, while Node.js decryption fails. This mainly stems from the differences in code implementation details and data processing methods.

The core of the problem lies in the error in the decryption result of the Node.js code. Python uses the cryptography library, Go uses the built-in crypto/aes package, while Node.js uses the crypto.createDecipheriv function (Note: createchipheriv mentioned in the original text is a typo, which should be createDecipheriv ).

In Node.js code, the key error lies in data processing:

 const x = ibuf.slice(8);

This code only intercepts data from the ibuf buffer starting from the 8th byte. However, the correct approach is to determine the length of data that needs to be decrypted based on the totalsize variable (representing the encrypted data size). The ibuf buffer may contain additional header information, so the correct data must be intercepted according to totalsize for decryption, rather than simply starting from the 8th byte. This causes the Node.js code to decrypt only part of the data, resulting in an error result.

In addition, the original text has clearly stated that the createDecipheriv function itself is used correctly, and the previous createchipheriv error was wrong, which will cause decryption failure. The provided supplementary sample code verifies the correct usage of crypto.createDecipheriv and crypto.createCipheriv in the Node.js environment, as well as the correct operation method of the Buffer object. In this example code, both encryption and decryption work properly, proving that Node.js' crypto library itself has no problem.

Therefore, the root of the problem lies in the error handling of data by the Node.js code, not the error of the algorithm itself or the library. If the Node.js code is able to process the data correctly and use the correct function, its decryption results will be consistent with those of Python and Go.

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