How to decode a aes-128-ecb where the key has random length?

user_9774071 0
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I'm trying to decode a code using nodejs and crypto. I tried to decode it using this website to get the result that I want. But I think I'm buffering the key the wrong way. How can I decode where the key is vague?

const decipher = crypto.createDecipheriv("aes-128-ecb", Buffer.from('4d52c7125cdd4e55868e190e0ec1c846', 'hex'), null);
const decryptedSecret = decipher.update('8E874DE6CE510690F8E2866FF5C8EA18A6B7CEF9DD4048C4EF6C7FFE678C6FD3', 'hex', 'hex') + decipher.final("hex");
console.log("final: ", decryptedSecret);

My expected result per the website is VeHo8t9C1DNxLsaU. I also tried to reverse encode it but still didnt get any result wanted.

node.js aes
1 Answers

The algorithm is AES-256-ECB with PKCS7 padding, the key 4d52...c846 is to be UTF-8 encoded, as output encoding UTF-8 is to be applied:

const decipher = crypto.createDecipheriv('aes-256-ecb', Buffer.from('4d52c7125cdd4e55868e190e0ec1c846', 'utf8'), null);
const decryptedSecret = decipher.update('8E874DE6CE510690F8E2866FF5C8EA18A6B7CEF9DD4048C4EF6C7FFE678C6FD3', 'hex', 'utf8') + decipher.final('utf8');
console.log("final: ", decryptedSecret); // final:  VeHo8t9C1DNxLsaU
user_90140970
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