eliashezron / aes_activity

👋 Hi, I'm Elias, Elias Hezron

👀 An Ethereum Core Developer Intern

I am passionate about blockchain based solutions

• 🚀 currently building oneramp a crypto on and offramping solution for subSaharan Africa.
• 🤖 Ex Intern at Nethermind, Was focused on core ethereum development
• 👀 looking to work with companies using the blockchain to impact the world
• 🔭 Looking also to contribute more to opensource.
• 🌱 I’m currently perfecting my solidity, Writing it in low level assembly.
• 👯 I’m looking to collaborate on EVM blockchain projects.
• 💬 Ask me about solidity
• ⚡ Fun fact: I love debugging
• 📫 How to reach me: [email protected]

Connect with me:

Languages and Tools:

---

⚡ GitHub Stats

 

aes_activity's Issues

Implement XOR first block with plaintext of the next block before it is encrypted

@kavehtehrani
Checking this implementation, your previous_ciphertext_block ungoes a double encryption in the first round. Also do not see where we XOR the previous block with the block bytes.

fn cbc_encrypt(plain_text: Vec<u8>, key: [u8; BLOCK_SIZE]) -> Vec<u8> {
    // Remember to generate a random initialization vector for the first block.
    let padded_text = pad(plain_text);
    let blocks = group(padded_text);
    let mut rng = rand::thread_rng();
    let mut iv: [u8; BLOCK_SIZE] = [0; BLOCK_SIZE];
    rng.fill(&mut iv);
    // encrypt the iv with the key
    let mut previous_ciphertext_block = aes_encrypt(iv, &key);

    let mut encrypted_blocks: Vec<[u8; BLOCK_SIZE]> = Vec::new();
    for block in blocks.iter() {
        previous_ciphertext_block = aes_encrypt(*block, &previous_ciphertext_block);
        encrypted_blocks.push(previous_ciphertext_block);
    }
    let mut ciphertext = un_group(encrypted_blocks);
    // Prepend the IV to the ciphertext
    ciphertext.splice(0..0, iv.iter().cloned());

    ciphertext
}