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use crypto::md5::Md5;
use crypto::digest::Digest;
use super::{Result, HashSetup, IntoHashSetup, consteq};
use error::Error;
use random;
use parse::{self, HashIterator};
use enc_dec::{md5_sha2_hash64_encode, bcrypt_hash64_decode};
use std::cmp::min;
pub const MAX_SALT_LEN: usize = 8;
const MD5_MAGIC: &'static str = "$1$";
const MD5_TRANSPOSE: &'static [u8] = b"\x0c\x06\x00\x0d\x07\x01\x0e\x08\x02\x0f\x09\x03\x05\x0a\x04\x0b";
fn do_md5_crypt(pass: &[u8], salt: &str) -> Result<String> {
let mut dummy_buf = [0u8; 6];
bcrypt_hash64_decode(salt, &mut dummy_buf)?;
let mut dgst_b = Md5::new();
let mut hash_b = [0u8; 16];
dgst_b.input(pass);
dgst_b.input(salt.as_bytes());
dgst_b.input(pass);
dgst_b.result(&mut hash_b);
let mut dgst_a = Md5::new();
let mut hash_a = [0u8; 16];
dgst_a.input(pass);
dgst_a.input(MD5_MAGIC.as_bytes());
dgst_a.input(salt.as_bytes());
let mut plen = pass.len();
while plen > 0 {
dgst_a.input(&hash_b[..min(plen, 16)]);
if plen < 16 {
break;
}
plen -= 16;
}
plen = pass.len();
while plen > 0 {
match plen & 1 {
0 => dgst_a.input(&pass[..1]),
1 => dgst_a.input(&[0u8]),
_ => unreachable!()
}
plen >>= 1;
}
dgst_a.result(&mut hash_a);
for r in 0..1000 {
dgst_a.reset();
if r % 2 == 1 {
dgst_a.input(pass);
} else {
dgst_a.input(&hash_a);
}
if r % 3 > 0 {
dgst_a.input(salt.as_bytes());
}
if r % 7 > 0 {
dgst_a.input(pass);
}
if r % 2 == 0 {
dgst_a.input(pass);
} else {
dgst_a.input(&hash_a);
}
dgst_a.result(&mut hash_a);
}
for (i, &ti) in MD5_TRANSPOSE.iter().enumerate() {
hash_b[i] = hash_a[ti as usize];
}
Ok(format!("{}{}${}", MD5_MAGIC, salt, md5_sha2_hash64_encode(&hash_b)))
}
#[deprecated(since="0.2.0", note="don't use this algorithm for new passwords")]
pub fn hash<B: AsRef<[u8]>>(pass: B) -> Result<String> {
let saltstr = random::gen_salt_str(MAX_SALT_LEN)?;
do_md5_crypt(pass.as_ref(), &saltstr)
}
const MAGIC_LEN: usize = 3;
fn parse_md5_hash(hash: &str) -> Result<HashSetup> {
let mut hs = parse::HashSlice::new(hash);
if hs.take(MAGIC_LEN).unwrap_or("X") != MD5_MAGIC {
return Err(Error::InvalidHashString);
}
let salt = if let Some(salt) = hs.take_until(b'$') {
salt
} else {
return Err(Error::InvalidHashString);
};
Ok(HashSetup { salt: Some(salt), rounds: None })
}
#[deprecated(since="0.2.0", note="don't use this algorithm for new passwords")]
pub fn hash_with<'a, IHS, B>(param: IHS, pass: B) -> Result<String>
where IHS: IntoHashSetup<'a>, B: AsRef<[u8]>
{
let hs = IHS::into_hash_setup(param, parse_md5_hash)?;
if let Some(salt) = hs.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);
};
do_md5_crypt(pass.as_ref(), salt)
} else {
let salt = random::gen_salt_str(MAX_SALT_LEN)?;
do_md5_crypt(pass.as_ref(), &salt)
}
}
pub fn verify<B: AsRef<[u8]>>(pass: B, hash: &str) -> bool {
#[allow(deprecated)]
consteq(hash, hash_with(hash, pass))
}
#[cfg(test)]
mod tests {
use ::HashSetup;
#[test]
#[allow(deprecated)]
fn custom() {
assert_eq!(super::hash_with("$1$5pZSV9va$azfrPr6af3Fc7dLblQXVa0", "password").unwrap(),
"$1$5pZSV9va$azfrPr6af3Fc7dLblQXVa0");
assert_eq!(super::hash_with(HashSetup { salt: Some("5pZSV9va"), rounds: None }, "password").unwrap(),
"$1$5pZSV9va$azfrPr6af3Fc7dLblQXVa0");
}
}