Zig 0.17.0-dev (Split by item)

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extend

chacha20.extend

fn extend(key: [32]u8, nonce: [24]u8, comptime rounds_nb: usize) struct

File

lib/std/crypto/chacha20.zig:522

Code

fn extend(key: [32]u8, nonce: [24]u8, comptime rounds_nb: usize) struct { key: [32]u8, nonce: [12]u8 } {
    var subnonce: [12]u8 = undefined;
    @memset(subnonce[0..4], 0);
    subnonce[4..].* = nonce[16..24].*;
    return .{
        .key = ChaChaImpl(rounds_nb).hchacha20(nonce[0..16].*, key),
        .nonce = subnonce,
    };
}