mysql 7.0.0

Mysql client library implemented in rust
Documentation 
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use std::num::Wrapping;

use byteorder::ReadBytesExt;
use byteorder::WriteBytesExt;
use byteorder::BigEndian as BE;

static K1: u32 = 0x5A827999u32;
static K2: u32 = 0x6ED9EBA1u32;
static K3: u32 = 0x8F1BBCDCu32;
static K4: u32 = 0xCA62C1D6u32;

#[inline]
fn circular_shift(bits: u32, Wrapping(word): Wrapping<u32>) -> u32 {
    word << (bits as usize) | word >> ((32u32 - bits) as usize)
}

#[allow(unused_must_use)]
pub fn sha1(message: &[u8]) -> Vec<u8> {
    let mut hash: [u32; 5] = [0x67452301,
                              0xEFCDAB89,
                              0x98BADCFE,
                              0x10325476,
                              0xC3D2E1F0];
    let mut msg = message.to_vec();
    let msg_bit_len = msg.len() * 8;
    let offset = (msg.len() * 8) % 512;
    if offset < 448 {
        msg.push(128u8);
        for _ in 0..(448 - (offset + 8)) / 8 {
            msg.push(0u8);
        }
    } else if offset >= 448 {
        msg.push(128u8);
        for _ in 0..(512 - (offset + 8)) / 8 + 56 {
            msg.push(0u8);
        }
    }
    msg.write_u64::<BE>(msg_bit_len as u64);

    for i in 0..(msg.len() * 8 / 512) {
        let mut w = [0u32; 80];
        let part = &msg[i * 64..(i+1) * 64];
        {
            let mut reader = &part[..];
            for j in 0usize..16 {
                w[j] = reader.read_u32::<BE>().unwrap();
            }
        }
        for j in 16usize..80 {
            let val = w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16];
            w[j] = circular_shift(1, Wrapping(val));
        }
        let mut a = Wrapping(hash[0]);
        let mut b = Wrapping(hash[1]);
        let mut c = Wrapping(hash[2]);
        let mut d = Wrapping(hash[3]);
        let mut e = Wrapping(hash[4]);
        let mut temp: Wrapping<u32>;
        for t in 0usize..20 {
            temp = Wrapping(circular_shift(5, a))
                 + (b & c | !b & d)
                 + e
                 + Wrapping(w[t])
                 + Wrapping(K1);
            e = d;
            d = c;
            c = Wrapping(circular_shift(30, b));
            b = a;
            a = temp;
        }
        for t in 20usize..40 {
            temp = Wrapping(circular_shift(5, a))
                 + (b ^ c ^ d)
                 + e
                 + Wrapping(w[t])
                 + Wrapping(K2);
            e = d;
            d = c;
            c = Wrapping(circular_shift(30, b));
            b = a;
            a = temp;
        }
        for t in 40usize..60 {
            temp = Wrapping(circular_shift(5, a))
                 + (b & c | b & d | c & d)
                 + e
                 + Wrapping(w[t])
                 + Wrapping(K3);
            e = d;
            d = c;
            c = Wrapping(circular_shift(30, b));
            b = a;
            a = temp;
        }
        for t in 60usize..80 {
            temp = Wrapping(circular_shift(5, a))
                 + (b ^ c ^ d)
                 + e
                 + Wrapping(w[t])
                 + Wrapping(K4);
            e = d;
            d = c;
            c = Wrapping(circular_shift(30, b));
            b = a;
            a = temp;
        }
        hash[0] = { let Wrapping(x) = Wrapping(hash[0]) + a; x};
        hash[1] = { let Wrapping(x) = Wrapping(hash[1]) + b; x};
        hash[2] = { let Wrapping(x) = Wrapping(hash[2]) + c; x};
        hash[3] = { let Wrapping(x) = Wrapping(hash[3]) + d; x};
        hash[4] = { let Wrapping(x) = Wrapping(hash[4]) + e; x};
    }

    let mut output = Vec::with_capacity(20);
    output.write_u32::<BE>(hash[0]);
    output.write_u32::<BE>(hash[1]);
    output.write_u32::<BE>(hash[2]);
    output.write_u32::<BE>(hash[3]);
    output.write_u32::<BE>(hash[4]);
    output
}

#[cfg(test)]
mod test {
    pub use super::sha1;

    #[test]
    fn should_compute_sha1_hash() {
        assert_eq!(sha1(&[115u8, 104u8, 97u8]),
                   vec![0xd8u8, 0xf4u8, 0x59u8, 0x03u8, 0x20u8, 0xe1u8,
                        0x34u8, 0x3au8, 0x91u8, 0x5bu8, 0x63u8, 0x94u8,
                        0x17u8, 0x06u8, 0x50u8, 0xa8u8, 0xf3u8, 0x5du8,
                        0x69u8, 0x26u8]);
        assert_eq!(sha1(&[65u8; 57]),
                   vec![0xe8u8, 0xd6u8, 0xeau8, 0x5cu8, 0x62u8, 0x7fu8,
                        0xc8u8, 0x67u8, 0x6fu8, 0xa6u8, 0x62u8, 0x67u8,
                        0x7bu8, 0x02u8, 0x86u8, 0x40u8, 0x84u8, 0x4du8,
                        0xc3u8, 0x5cu8]);
        assert_eq!(sha1(&[65u8; 56]),
                   vec![0x6bu8, 0x45u8, 0xe3u8, 0xcfu8, 0x1eu8, 0xb3u8,
                        0x32u8, 0x4bu8, 0x9fu8, 0xd4u8, 0xdfu8, 0x3bu8,
                        0x83u8, 0xd8u8, 0x9cu8, 0x4cu8, 0x2cu8, 0x4cu8,
                        0xa8u8, 0x96u8]);
        assert_eq!(sha1(&[65u8; 64]),
                   vec![0x30u8, 0xb8u8, 0x6eu8, 0x44u8, 0xe6u8, 0x00u8,
                        0x14u8, 0x03u8, 0x82u8, 0x7au8, 0x62u8, 0xc5u8,
                        0x8bu8, 0x08u8, 0x89u8, 0x3eu8, 0x77u8, 0xcfu8,
                        0x12u8, 0x1fu8]);
        assert_eq!(sha1(&[65u8; 65]),
                   vec![0x82u8, 0x6bu8, 0x7eu8, 0x7au8, 0x7au8, 0xf8u8,
                        0xa5u8, 0x29u8, 0xaeu8, 0x1cu8, 0x74u8, 0x43u8,
                        0xc2u8, 0x3bu8, 0xf1u8, 0x85u8, 0xc0u8, 0xadu8,
                        0x44u8, 0x0cu8]);
    }
}