How to Decrypt AES in ECB Mode with Go?

Decrypting AES in ECB Mode with Go

Question:

You're encountering issues while implementing AES ECB mode encryption in Go. Specifically, you're unsure how to switch the encryption mode in the crypto/aes package, and your code currently isn't providing correct results.

Answer:

Understanding ECB Mode:

Electronic Codebook (ECB) is a straightforward encryption mode where each data block is encrypted independently using the AES algorithm. The data is divided into fixed-size blocks (typically 16 bytes for AES), and each block is encrypted with the same encryption key.

Implementing ECB Mode Decryption in Go:

To decrypt AES data in ECB mode using Go's crypto/aes package, you can employ the following code:

<code class="go">package main

import (
    "crypto/aes"
)

func DecryptAes128Ecb(data, key []byte) []byte {
    cipher, _ := aes.NewCipher([]byte(key))
    decrypted := make([]byte, len(data))

    // Define the block size
    size := 16

    // Iterate over the data and decrypt each block
    for bs, be := 0, size; bs < len(data); bs, be = bs+size, be+size {
        cipher.Decrypt(decrypted[bs:be], data[bs:be])
    }

    return decrypted
}</code>

Note on ECB Mode Security:

While ECB mode is straightforward to implement, it's crucial to note that it is generally considered insecure. This is because repeated plaintext blocks will always encrypt to the same ciphertext blocks, making patterns in the data easily detectable. For this reason, ECB mode is typically not recommended for practical use.

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