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use std::cmp::min;
use crypto::digest::Digest;
use enc_dec::{md5_sha2_hash64_encode, bcrypt_hash64_decode};
use super::{Result, HashSetup};
use error::Error;
use parse::{self, HashIterator};
use random;
pub const MIN_ROUNDS: u32 = 1000;
pub const MAX_ROUNDS: u32 = 999999999;
pub const DEFAULT_ROUNDS: u32 = 5000;
pub const MAX_SALT_LEN: usize = 16;
pub fn sha2_crypt<D: Digest>(pass: &[u8], salt: &str, rounds: Option<u32>,
new_digest: fn() -> D, trn_table: &[u8],
magic: &str) -> Result<String> {
let mut dummy_buf = [0u8; 12];
bcrypt_hash64_decode(salt, &mut dummy_buf)?;
let mut dgst_b = new_digest();
let dsize = dgst_b.output_bytes();
dgst_b.input(pass);
dgst_b.input_str(salt);
dgst_b.input(pass);
let mut hash_b = [0u8; 64];
dgst_b.result(&mut hash_b);
let mut dgst_a = new_digest();
dgst_a.input(pass);
dgst_a.input_str(salt);
let plen = pass.len();
let mut p = plen;
while p > 0 {
dgst_a.input(&hash_b[..min(p, dsize)]);
if p < dsize {
break;
}
p -= dsize;
}
p = plen;
while p > 0 {
match p & 1 {
0 => dgst_a.input(pass),
1 => dgst_a.input(&hash_b[..dsize]),
_ => unreachable!()
}
p >>= 1;
}
let mut hash_a = [0u8; 64];
dgst_a.result(&mut hash_a);
dgst_b.reset();
for _ in 0..plen {
dgst_b.input(pass);
}
dgst_b.result(&mut hash_b);
let mut seq_p = Vec::<u8>::with_capacity(((plen + dsize - 1) / dsize) * dsize);
p = plen;
while p > 0 {
seq_p.extend(&hash_b[..min(p, dsize)]);
if p < dsize {
break;
}
p -= dsize;
}
dgst_b.reset();
for _ in 0..MAX_SALT_LEN+(hash_a[0] as usize) {
dgst_b.input_str(salt);
}
dgst_b.result(&mut hash_b);
let mut seq_s = Vec::<u8>::with_capacity(MAX_SALT_LEN);
seq_s.extend(&hash_b[..salt.len()]);
for r in 0..rounds.unwrap_or(DEFAULT_ROUNDS) {
dgst_a.reset();
if r % 2 == 1 {
dgst_a.input(&seq_p[..]);
} else {
dgst_a.input(&hash_a[..dsize]);
}
if r % 3 > 0 {
dgst_a.input(&seq_s[..]);
}
if r % 7 > 0 {
dgst_a.input(&seq_p[..]);
}
if r % 2 == 1 {
dgst_a.input(&hash_a[..dsize]);
} else {
dgst_a.input(&seq_p[..]);
}
dgst_a.result(&mut hash_a);
}
for (i, &ti) in trn_table.iter().enumerate() {
hash_b[i] = hash_a[ti as usize];
}
match rounds {
Some(rounds) => Ok(format!("{}rounds={}${}${}", magic, rounds, salt,
md5_sha2_hash64_encode(&hash_b[..dsize]))),
None => Ok(format!("{}{}${}", magic, salt,
md5_sha2_hash64_encode(&hash_b[..dsize])))
}
}
const MAGIC_LEN: usize = 3;
pub fn parse_sha2_hash<'a>(hash: &'a str, magic: &str) -> Result<HashSetup<'a>> {
let mut hs = parse::HashSlice::new(hash);
if hs.take(MAGIC_LEN).unwrap_or("X") != magic {
return Err(Error::InvalidHashString);
}
let maybe_rounds = if let Some(elem) = hs.take_until(b'$') {
elem
} else {
return Err(Error::InvalidHashString);
};
let rounds = if maybe_rounds.starts_with("rounds=") {
let mut rhs = parse::HashSlice::new(maybe_rounds);
rhs.take_until(b'=');
Some(rhs.take_until(b'$').unwrap().parse::<u32>().map_err(|_e| Error::InvalidRounds)?)
} else { None };
let salt = if rounds.is_none() {
maybe_rounds
} else if let Some(salt) = hs.take_until(b'$') {
salt
} else {
return Err(Error::InvalidHashString);
};
Ok(HashSetup { salt: Some(salt), rounds: rounds })
}
pub fn sha2_hash_with(param: HashSetup, pass: &[u8], hf: fn(&[u8], &str, Option<u32>) -> Result<String>) -> Result<String> {
let rounds = if let Some(r) = param.rounds {
if r < MIN_ROUNDS {
Some(MIN_ROUNDS)
} else if r > MAX_ROUNDS {
Some(MAX_ROUNDS)
} else {
Some(r)
}
} else { None };
if let Some(salt) = param.salt {
let salt = if salt.len() <= MAX_SALT_LEN {
salt
} else if let Some(truncated_salt) = parse::HashSlice::new(salt).take(MAX_SALT_LEN) {
truncated_salt
} else {
return Err(Error::InvalidHashString);
};
hf(pass, salt, rounds)
} else {
let salt = random::gen_salt_str(MAX_SALT_LEN)?;
hf(pass, &salt, rounds)
}
}