exiftool-rs 0.5.0

Read, write, and edit metadata in 93 file formats — a pure Rust reimplementation of ExifTool 13.53 with 100% tag name parity (194/194 test files)
Documentation 
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//! Minimal MD5 implementation (RFC 1321) for CurrentIPTCDigest.

pub fn md5(data: &[u8]) -> [u8; 16] {
    let mut state: [u32; 4] = [0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476];
    let orig_len = data.len() as u64 * 8;

    // Pad message
    let mut msg = data.to_vec();
    msg.push(0x80);
    while msg.len() % 64 != 56 {
        msg.push(0);
    }
    msg.extend_from_slice(&orig_len.to_le_bytes());

    // Process 64-byte blocks
    for chunk in msg.chunks_exact(64) {
        let mut m = [0u32; 16];
        for i in 0..16 {
            m[i] = u32::from_le_bytes([
                chunk[i * 4],
                chunk[i * 4 + 1],
                chunk[i * 4 + 2],
                chunk[i * 4 + 3],
            ]);
        }
        let (mut a, mut b, mut c, mut d) = (state[0], state[1], state[2], state[3]);

        for i in 0..64u32 {
            let (f, g) = match i {
                0..=15 => ((b & c) | (!b & d), i as usize),
                16..=31 => ((d & b) | (!d & c), (5 * i + 1) as usize % 16),
                32..=47 => (b ^ c ^ d, (3 * i + 5) as usize % 16),
                _ => (c ^ (b | !d), (7 * i) as usize % 16),
            };
            let temp = d;
            d = c;
            c = b;
            b = b.wrapping_add(
                (a.wrapping_add(f)
                    .wrapping_add(K[i as usize])
                    .wrapping_add(m[g]))
                .rotate_left(S[i as usize]),
            );
            a = temp;
        }
        state[0] = state[0].wrapping_add(a);
        state[1] = state[1].wrapping_add(b);
        state[2] = state[2].wrapping_add(c);
        state[3] = state[3].wrapping_add(d);
    }

    let mut digest = [0u8; 16];
    for (i, &s) in state.iter().enumerate() {
        digest[i * 4..i * 4 + 4].copy_from_slice(&s.to_le_bytes());
    }
    digest
}

pub fn md5_hex(data: &[u8]) -> String {
    md5(data).iter().map(|b| format!("{:02x}", b)).collect()
}

static S: [u32; 64] = [
    7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9,
    14, 20, 5, 9, 14, 20, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 6, 10, 15,
    21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21,
];

static K: [u32; 64] = [
    0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
    0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
    0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
    0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
    0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
    0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
    0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
    0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391,
];