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polyPackT1

Pack polynomial with coefficients < 1024 (T1) into bytes. Packs 10 bits per coefficient: 4 coefficients into 5 bytes. Assumes coefficients are normalized.

ml_dsa.polyPackT1

fn polyPackT1(p: Poly, buf: []u8) void

File

lib/std/crypto/ml_dsa.zig:1039

Code

fn polyPackT1(p: Poly, buf: []u8) void {
    var j: usize = 0;
    var i: usize = 0;
    while (i < buf.len) : (i += 5) {
        buf[i] = @truncate(p.cs[j]);
        buf[i + 1] = @truncate((p.cs[j] >> 8) | (p.cs[j + 1] << 2));
        buf[i + 2] = @truncate((p.cs[j + 1] >> 6) | (p.cs[j + 2] << 4));
        buf[i + 3] = @truncate((p.cs[j + 2] >> 4) | (p.cs[j + 3] << 6));
        buf[i + 4] = @truncate(p.cs[j + 3] >> 2);
        j += 4;
    }
}