Zig 0.17.0-dev (Split by item)

This is an example of documentation generated by ZigDoc, an alternative to Zig's built-in Auto Doc feature. See also examples in other modes/formats. The project being documented here (as the example) is the Zig library itself.

XChaChaIETF

chacha20.XChaChaIETF

fn XChaChaIETF(comptime rounds_nb: usize) type

File

lib/std/crypto/chacha20.zig:610

Code

fn XChaChaIETF(comptime rounds_nb: usize) type {
    return struct {
        /// Nonce length in bytes.
        pub const nonce_length = 24;
        /// Key length in bytes.
        pub const key_length = 32;
        /// Block length in bytes.
        pub const block_length = 64;

        /// Add the output of the XChaCha20 stream cipher to `in` and stores the result into `out`.
        /// WARNING: This function doesn't provide authenticated encryption.
        /// Using the AEAD or one of the `box` versions is usually preferred.
        pub fn xor(out: []u8, in: []const u8, counter: u32, key: [key_length]u8, nonce: [nonce_length]u8) void {
            const extended = extend(key, nonce, rounds_nb);
            ChaChaIETF(rounds_nb).xor(out, in, counter, extended.key, extended.nonce);
        }

        /// Write the output of the XChaCha20 stream cipher into `out`.
        pub fn stream(out: []u8, counter: u32, key: [key_length]u8, nonce: [nonce_length]u8) void {
            const extended = extend(key, nonce, rounds_nb);
            ChaChaIETF(rounds_nb).stream(out, counter, extended.key, extended.nonce);
        }
    };
}