pub fn crc32(data: &[u8]) -> u32 {
let mut crc: u32 = 0xFFFFFFFF;
for &byte in data {
let mut b = byte as u32;
for _ in 0..8 {
if (crc ^ b) & 1 == 1 {
crc = (crc >> 1) ^ 0xEDB88320;
} else {
crc >>= 1;
}
b >>= 1;
}
}
!crc
}
pub fn adler32(data: &[u8]) -> u32 {
const MOD: u32 = 65521;
let mut a: u32 = 1;
let mut b: u32 = 0;
for &byte in data {
a = (a + byte as u32) % MOD;
b = (b + a) % MOD;
}
(b << 16) | a
}
pub fn sha1(data: &[u8]) -> [u8; 20] {
fn rot_left(x: u32, n: u32) -> u32 {
(x << n) | (x >> (32 - n))
}
let mut h = [
0x67452301u32,
0xEFCDAB89,
0x98BADCFE,
0x10325476,
0xC3D2E1F0,
];
let mut msg = data.to_vec();
let bit_len = (data.len() as u64) * 8;
msg.push(0x80);
while (msg.len() % 64) != 56 {
msg.push(0);
}
msg.extend_from_slice(&bit_len.to_be_bytes());
for chunk in msg.chunks_exact(64) {
let mut w = [0u32; 80];
for i in 0..16 {
w[i] = u32::from_be_bytes([
chunk[i * 4],
chunk[i * 4 + 1],
chunk[i * 4 + 2],
chunk[i * 4 + 3],
]);
}
for i in 16..80 {
w[i] = rot_left(w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16], 1);
}
let (mut a, mut b, mut c, mut d, mut e) = (h[0], h[1], h[2], h[3], h[4]);
for i in 0..80 {
let (f, k) = match i {
0..=19 => ((b & c) | (!b & d), 0x5A827999),
20..=39 => (b ^ c ^ d, 0x6ED9EBA1),
40..=59 => ((b & c) | (b & d) | (c & d), 0x8F1BBCDC),
_ => (b ^ c ^ d, 0xCA62C1D6),
};
let temp = rot_left(a, 5)
.wrapping_add(f)
.wrapping_add(e)
.wrapping_add(k)
.wrapping_add(w[i]);
e = d;
d = c;
c = rot_left(b, 30);
b = a;
a = temp;
}
h[0] = h[0].wrapping_add(a);
h[1] = h[1].wrapping_add(b);
h[2] = h[2].wrapping_add(c);
h[3] = h[3].wrapping_add(d);
h[4] = h[4].wrapping_add(e);
}
let mut out = [0u8; 20];
for (i, &v) in h.iter().enumerate() {
out[i * 4..(i + 1) * 4].copy_from_slice(&v.to_be_bytes());
}
out
}
pub fn sha256(data: &[u8]) -> [u8; 32] {
const K: [u32; 64] = [
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
];
fn rot_right(x: u32, n: u32) -> u32 {
(x >> n) | (x << (32 - n))
}
let mut h = [
0x6a09e667u32,
0xbb67ae85,
0x3c6ef372,
0xa54ff53a,
0x510e527f,
0x9b05688c,
0x1f83d9ab,
0x5be0cd19,
];
let mut msg = data.to_vec();
let bit_len = (data.len() as u64) * 8;
msg.push(0x80);
while (msg.len() % 64) != 56 {
msg.push(0);
}
msg.extend_from_slice(&bit_len.to_be_bytes());
for chunk in msg.chunks_exact(64) {
let mut w = [0u32; 64];
for i in 0..16 {
w[i] = u32::from_be_bytes([
chunk[i * 4],
chunk[i * 4 + 1],
chunk[i * 4 + 2],
chunk[i * 4 + 3],
]);
}
for i in 16..64 {
let s0 = rot_right(w[i - 15], 7) ^ rot_right(w[i - 15], 18) ^ (w[i - 15] >> 3);
let s1 = rot_right(w[i - 2], 17) ^ rot_right(w[i - 2], 19) ^ (w[i - 2] >> 10);
w[i] = w[i - 16]
.wrapping_add(s0)
.wrapping_add(w[i - 7])
.wrapping_add(s1);
}
let (mut a, mut b, mut c, mut d, mut e, mut f, mut g, mut h_var) =
(h[0], h[1], h[2], h[3], h[4], h[5], h[6], h[7]);
for i in 0..64 {
let s1 = rot_right(e, 6) ^ rot_right(e, 11) ^ rot_right(e, 25);
let ch = (e & f) ^ (!e & g);
let temp1 = h_var
.wrapping_add(s1)
.wrapping_add(ch)
.wrapping_add(K[i])
.wrapping_add(w[i]);
let s0 = rot_right(a, 2) ^ rot_right(a, 13) ^ rot_right(a, 22);
let maj = (a & b) ^ (a & c) ^ (b & c);
let temp2 = s0.wrapping_add(maj);
h_var = g;
g = f;
f = e;
e = d.wrapping_add(temp1);
d = c;
c = b;
b = a;
a = temp1.wrapping_add(temp2);
}
h[0] = h[0].wrapping_add(a);
h[1] = h[1].wrapping_add(b);
h[2] = h[2].wrapping_add(c);
h[3] = h[3].wrapping_add(d);
h[4] = h[4].wrapping_add(e);
h[5] = h[5].wrapping_add(f);
h[6] = h[6].wrapping_add(g);
h[7] = h[7].wrapping_add(h_var);
}
let mut out = [0u8; 32];
for (i, &v) in h.iter().enumerate() {
out[i * 4..(i + 1) * 4].copy_from_slice(&v.to_be_bytes());
}
out
}
pub fn hmac_sha256(key: &[u8], data: &[u8]) -> [u8; 32] {
const BLOCK_SIZE: usize = 64;
let mut key_block = [0u8; BLOCK_SIZE];
if key.len() > BLOCK_SIZE {
key_block[..32].copy_from_slice(&sha256(key));
} else {
key_block[..key.len()].copy_from_slice(key);
}
let mut ipad = [0x36u8; BLOCK_SIZE];
let mut opad = [0x5cu8; BLOCK_SIZE];
for i in 0..BLOCK_SIZE {
ipad[i] ^= key_block[i];
opad[i] ^= key_block[i];
}
let mut inner = ipad.to_vec();
inner.extend_from_slice(data);
let inner_hash = sha256(&inner);
let mut outer = opad.to_vec();
outer.extend_from_slice(&inner_hash);
sha256(&outer)
}
pub fn pbkdf2_hmac_sha256(
password: &[u8],
salt: &[u8],
iterations: u32,
output_len: usize,
) -> Vec<u8> {
let mut result = Vec::with_capacity(output_len);
let mut block_num = 1u32;
while result.len() < output_len {
let mut salt_block = salt.to_vec();
salt_block.extend_from_slice(&block_num.to_be_bytes());
let mut u = hmac_sha256(password, &salt_block);
let mut f = u;
for _ in 1..iterations {
u = hmac_sha256(password, &u);
for i in 0..32 {
f[i] ^= u[i];
}
}
result.extend_from_slice(&f);
block_num += 1;
}
result.truncate(output_len);
result
}