commonware-cryptography 2026.10.0

Generate keys, sign arbitrary messages, and deterministically verify signatures.
Documentation 
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use cfg_if::cfg_if;

cfg_if! {
    if #[cfg(any(
        feature = "std",
        all(
            target_feature = "sha",
            target_feature = "avx2",
            target_feature = "ssse3",
            target_feature = "sse4.1",
        ),
    ))] {
        mod pair;
        pub(super) use pair::{hash_pair_64, hash_pair_72};
    }
}

cfg_if! {
    if #[cfg(any(
        feature = "std",
        all(
            target_feature = "avx512f",
            target_feature = "avx512bw",
            target_feature = "avx512vl",
        ),
    ))] {
        mod x16;
        pub(super) use x16::hash_x16_equal;
    }
}

/// Wrapper that aligns constant tables for aligned vector loads.
#[repr(align(16))]
struct Align16<T>(T);

/// The SHA-256 round constants (FIPS 180-4, section 4.2.2).
static K: Align16<[u32; 64]> = Align16([
    0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
    0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
    0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
    0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
    0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
    0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
    0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
    0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
]);