Zig 0.17.0-dev (Split by item)

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generateTable

soft.generateTable

fn generateTable(invert: bool) [4][256]u32

File

lib/std/crypto/aes/soft.zig:772

Code

fn generateTable(invert: bool) [4][256]u32 {
    @setEvalBranchQuota(50000);

    var table: [4][256]u32 = undefined;

    for (generateSbox(invert), 0..) |value, index| {
        table[0][index] = math.shl(u32, mul(value, if (invert) 0xb else 0x3), 24);
        table[0][index] |= math.shl(u32, mul(value, if (invert) 0xd else 0x1), 16);
        table[0][index] |= math.shl(u32, mul(value, if (invert) 0x9 else 0x1), 8);
        table[0][index] |= mul(value, if (invert) 0xe else 0x2);

        table[1][index] = math.rotl(u32, table[0][index], 8);
        table[2][index] = math.rotl(u32, table[0][index], 16);
        table[3][index] = math.rotl(u32, table[0][index], 24);
    }

    return table;
}