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use openssl;
use std::collections::HashSet;
use primitives::fixed_xor;
pub fn decrypt_aes_128_ecb (bytes: &[u8], key: &[u8]) -> Vec<u8> {
return openssl::crypto::symm::decrypt(
openssl::crypto::symm::Type::AES_128_ECB,
key,
vec![],
bytes
)
}
pub fn decrypt_aes_128_cbc (bytes: &[u8], key: &[u8], iv: &[u8]) -> Vec<u8> {
let mut prev = iv.clone();
let mut plaintext = vec![];
for block in bytes.chunks(16) {
// XXX not sure what's going on here - decrypt_aes_128_ecb doesn't
// decrypt the last block?
let double_block: Vec<u8> = block
.iter()
.chain(block.iter()).map(|x| *x)
.collect();
let plaintext_block = fixed_xor(
&decrypt_aes_128_ecb(&double_block[..], key)[..],
prev
);
for &c in &plaintext_block[..16] {
plaintext.push(c);
}
prev = block.clone();
}
let padding = plaintext[plaintext.len() - 1];
let new_len = plaintext.len() - padding as usize;
plaintext.truncate(new_len);
return plaintext;
}
pub fn find_aes_128_ecb_encrypted_string (inputs: &[Vec<u8>]) -> Vec<u8> {
let mut max_dups = 0;
let mut found = vec![];
for input in inputs {
let mut set = HashSet::new();
let mut dups = 0;
for block in input.chunks(16) {
if !set.insert(block) {
dups += 1;
}
}
if dups > max_dups {
max_dups = dups;
found = input.clone();
}
}
return found;
}
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