How to Correctly Decrypt AES ECB Encryption in Go?

AES ECB Encryption in Go

In Go, AES encryption in ECB mode can be achieved using the crypto/aes package. ECB mode is a simple encryption mode where each block of plaintext is encrypted independently, resulting in repeated plaintext blocks producing identical encrypted blocks.

Deciphering ECB Encryption

The provided Go code attempts to decrypt AES ECB-encrypted data. However, there are several issues:

• In the Decrypt function, PKCS5Pad should be applied before decrypting the data.
• The AESECB function correctly interprets the ECB decryption process but contains an error in specifying the block size.

Correct ECB Decryption in Go

The following Go code provides a corrected ECB decryption function:

<code class="go">import (
    "crypto/aes"
    "fmt"
)

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

    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>

Security Considerations

It's important to note that ECB mode is insecure and should not be used in modern cryptographic applications. ECB mode reveals patterns in plaintext data, making it susceptible to attack. Alternative modes such as CBC or OFB are more secure and should be considered instead.

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