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67 lines
3.2 KiB
Rust
67 lines
3.2 KiB
Rust
//! SHA-256 (FIPS 180-4), for verifying downloaded test corpora without
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//! depending on `sha256sum`/`shasum` being installed.
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const K: [u32; 64] = [
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74,
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0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d,
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0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e,
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0x92722c85, 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
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0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
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];
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/// Lower-case hex SHA-256 of `data`.
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pub fn hex(data: &[u8]) -> String {
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let mut h: [u32; 8] = [0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19];
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let mut msg = data.to_vec();
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let bits = (data.len() as u64).wrapping_mul(8);
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msg.push(0x80);
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while msg.len() % 64 != 56 {
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msg.push(0);
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}
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msg.extend_from_slice(&bits.to_be_bytes());
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for block in msg.as_chunks::<64>().0 {
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let mut w = [0u32; 64];
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for (i, word) in block.as_chunks::<4>().0.iter().enumerate() {
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w[i] = u32::from_be_bytes(*word);
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}
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for i in 16..64 {
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let s0 = w[i - 15].rotate_right(7) ^ w[i - 15].rotate_right(18) ^ (w[i - 15] >> 3);
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let s1 = w[i - 2].rotate_right(17) ^ w[i - 2].rotate_right(19) ^ (w[i - 2] >> 10);
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w[i] = w[i - 16].wrapping_add(s0).wrapping_add(w[i - 7]).wrapping_add(s1);
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}
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let [mut a, mut b, mut c, mut d, mut e, mut f, mut g, mut hh] = h;
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for i in 0..64 {
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let s1 = e.rotate_right(6) ^ e.rotate_right(11) ^ e.rotate_right(25);
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let ch = (e & f) ^ (!e & g);
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let t1 = hh.wrapping_add(s1).wrapping_add(ch).wrapping_add(K[i]).wrapping_add(w[i]);
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let s0 = a.rotate_right(2) ^ a.rotate_right(13) ^ a.rotate_right(22);
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let maj = (a & b) ^ (a & c) ^ (b & c);
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let t2 = s0.wrapping_add(maj);
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hh = g;
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g = f;
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f = e;
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e = d.wrapping_add(t1);
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d = c;
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c = b;
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b = a;
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a = t1.wrapping_add(t2);
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}
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for (x, v) in h.iter_mut().zip([a, b, c, d, e, f, g, hh]) {
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*x = x.wrapping_add(v);
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}
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}
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h.iter().map(|v| format!("{v:08x}")).collect()
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}
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#[cfg(test)]
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mod tests {
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#[test]
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fn known_vectors() {
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assert_eq!(super::hex(b""), "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855");
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assert_eq!(super::hex(b"abc"), "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad");
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let long = b"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq";
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assert_eq!(super::hex(long), "248d6a61d20638b8e5c026930c3e6039a33ce45964ff2167f6ecedd419db06c1");
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assert_eq!(super::hex(&[b'a'; 1000]), "41edece42d63e8d9bf515a9ba6932e1c20cbc9f5a5d134645adb5db1b9737ea3");
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}
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}
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