const AES_RCON: [u8; 10] = [0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1B, 0x36];
const BASE64_ALPHABET: &[u8; 64] =
b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
#[rustfmt::skip]
const AES_S_BOX: [u8; 256] = [
0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16,
];
fn encode_base64(bytes: &[u8]) -> String {
let mut result = String::new();
let mut index = 0usize;
while index + 3 <= bytes.len() {
let value = ((u32::from(bytes[index])) << 16)
| ((u32::from(bytes[index + 1])) << 8)
| u32::from(bytes[index + 2]);
result.push(BASE64_ALPHABET[((value >> 18) & 63) as usize] as char);
result.push(BASE64_ALPHABET[((value >> 12) & 63) as usize] as char);
result.push(BASE64_ALPHABET[((value >> 6) & 63) as usize] as char);
result.push(BASE64_ALPHABET[(value & 63) as usize] as char);
index += 3;
}
match bytes.len() - index {
1 => {
let value = u32::from(bytes[index]);
result.push(BASE64_ALPHABET[(value >> 2) as usize] as char);
result.push(BASE64_ALPHABET[((value << 4) & 63) as usize] as char);
result.push('=');
result.push('=');
}
2 => {
let value = ((u32::from(bytes[index])) << 8) | u32::from(bytes[index + 1]);
result.push(BASE64_ALPHABET[(value >> 10) as usize] as char);
result.push(BASE64_ALPHABET[((value >> 4) & 63) as usize] as char);
result.push(BASE64_ALPHABET[((value << 2) & 63) as usize] as char);
result.push('=');
}
_ => {}
}
result
}
fn pkcs7_pad(value: &[u8], block_size: usize) -> Vec<u8> {
let padding = block_size - (value.len() % block_size);
let mut result = value.to_vec();
result.extend(std::iter::repeat_n(padding as u8, padding));
result
}
fn rot_word(word: [u8; 4]) -> [u8; 4] {
[word[1], word[2], word[3], word[0]]
}
fn sub_word(word: [u8; 4]) -> [u8; 4] {
[
AES_S_BOX[word[0] as usize],
AES_S_BOX[word[1] as usize],
AES_S_BOX[word[2] as usize],
AES_S_BOX[word[3] as usize],
]
}
fn expand_aes128_key(key: &[u8; 16]) -> [u8; 176] {
let mut expanded = [0u8; 176];
expanded[..16].copy_from_slice(key);
let mut bytes_generated = 16usize;
let mut rcon_index = 0usize;
while bytes_generated < expanded.len() {
let mut temp = [
expanded[bytes_generated - 4],
expanded[bytes_generated - 3],
expanded[bytes_generated - 2],
expanded[bytes_generated - 1],
];
if bytes_generated.is_multiple_of(16) {
temp = sub_word(rot_word(temp));
temp[0] ^= AES_RCON[rcon_index];
rcon_index += 1;
}
for byte in temp {
expanded[bytes_generated] = expanded[bytes_generated - 16] ^ byte;
bytes_generated += 1;
}
}
expanded
}
fn add_round_key(state: &mut [u8; 16], round_key: &[u8]) {
for index in 0..16 {
state[index] ^= round_key[index];
}
}
fn sub_bytes(state: &mut [u8; 16]) {
for byte in state.iter_mut() {
*byte = AES_S_BOX[*byte as usize];
}
}
fn shift_rows(state: &mut [u8; 16]) {
let original = *state;
state[0] = original[0];
state[4] = original[4];
state[8] = original[8];
state[12] = original[12];
state[1] = original[5];
state[5] = original[9];
state[9] = original[13];
state[13] = original[1];
state[2] = original[10];
state[6] = original[14];
state[10] = original[2];
state[14] = original[6];
state[3] = original[15];
state[7] = original[3];
state[11] = original[7];
state[15] = original[11];
}
fn xtime(value: u8) -> u8 {
if value & 0x80 != 0 {
(value << 1) ^ 0x1b
} else {
value << 1
}
}
fn mix_single_column(column: &mut [u8; 4]) {
let original = *column;
let xor_all = original[0] ^ original[1] ^ original[2] ^ original[3];
column[0] ^= xor_all ^ xtime(original[0] ^ original[1]);
column[1] ^= xor_all ^ xtime(original[1] ^ original[2]);
column[2] ^= xor_all ^ xtime(original[2] ^ original[3]);
column[3] ^= xor_all ^ xtime(original[3] ^ original[0]);
}
fn mix_columns(state: &mut [u8; 16]) {
for column_index in 0..4 {
let start = column_index * 4;
let mut column = [
state[start],
state[start + 1],
state[start + 2],
state[start + 3],
];
mix_single_column(&mut column);
state[start..start + 4].copy_from_slice(&column);
}
}
fn aes128_encrypt_block(block: &[u8; 16], expanded_key: &[u8; 176]) -> [u8; 16] {
let mut state = *block;
add_round_key(&mut state, &expanded_key[..16]);
for round in 1..10 {
sub_bytes(&mut state);
shift_rows(&mut state);
mix_columns(&mut state);
add_round_key(&mut state, &expanded_key[round * 16..(round + 1) * 16]);
}
sub_bytes(&mut state);
shift_rows(&mut state);
add_round_key(&mut state, &expanded_key[160..176]);
state
}
fn aes128_cbc_encrypt_pkcs7(plaintext: &[u8], key: &[u8; 16], iv: &[u8; 16]) -> Vec<u8> {
let expanded_key = expand_aes128_key(key);
let padded = pkcs7_pad(plaintext, 16);
let mut previous = *iv;
let mut result = Vec::with_capacity(padded.len());
for chunk in padded.chunks_exact(16) {
let mut block = [0u8; 16];
for index in 0..16 {
block[index] = chunk[index] ^ previous[index];
}
let encrypted = aes128_encrypt_block(&block, &expanded_key);
result.extend_from_slice(&encrypted);
previous = encrypted;
}
result
}
pub(super) fn encrypt_kuaishou_anonymous_kww_seed(seed: &str, key: &[u8; 16]) -> String {
let encrypted = aes128_cbc_encrypt_pkcs7(seed.as_bytes(), key, key);
encode_base64(&encrypted)
}