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salsa8core

scrypt.salsa8core

fn salsa8core(b: *align(16) [16]u32) void

File

lib/std/crypto/scrypt.zig:44

Code

fn salsa8core(b: *align(16) [16]u32) void {
    const arx_steps = comptime [_]QuarterRound{
        Rp(4, 0, 12, 7),   Rp(8, 4, 0, 9),    Rp(12, 8, 4, 13),   Rp(0, 12, 8, 18),
        Rp(9, 5, 1, 7),    Rp(13, 9, 5, 9),   Rp(1, 13, 9, 13),   Rp(5, 1, 13, 18),
        Rp(14, 10, 6, 7),  Rp(2, 14, 10, 9),  Rp(6, 2, 14, 13),   Rp(10, 6, 2, 18),
        Rp(3, 15, 11, 7),  Rp(7, 3, 15, 9),   Rp(11, 7, 3, 13),   Rp(15, 11, 7, 18),
        Rp(1, 0, 3, 7),    Rp(2, 1, 0, 9),    Rp(3, 2, 1, 13),    Rp(0, 3, 2, 18),
        Rp(6, 5, 4, 7),    Rp(7, 6, 5, 9),    Rp(4, 7, 6, 13),    Rp(5, 4, 7, 18),
        Rp(11, 10, 9, 7),  Rp(8, 11, 10, 9),  Rp(9, 8, 11, 13),   Rp(10, 9, 8, 18),
        Rp(12, 15, 14, 7), Rp(13, 12, 15, 9), Rp(14, 13, 12, 13), Rp(15, 14, 13, 18),
    };
    var x = b.*;
    var j: usize = 0;
    while (j < 8) : (j += 2) {
        inline for (arx_steps) |r| {
            x[r.a] ^= math.rotl(u32, x[r.b] +% x[r.c], r.d);
        }
    }
    j = 0;
    while (j < 16) : (j += 1) {
        b[j] +%= x[j];
    }
}