Function encrypt [src]

c: ciphertext: output buffer should be of size m.len tag: authentication tag: output MAC m: message ad: Associated Data npub: public nonce k: private key

Prototype

 pub fn encrypt(c: []u8, tag: *[tag_length]u8, m: []const u8, ad: []const u8, npub: [nonce_length]u8, k: [key_length]u8) void

Parameters

c: []u8tag: *[tag_length]u8m: []const u8ad: []const u8npub: [nonce_length]u8k: [key_length]u8

Source

  pub fn encrypt(c: []u8, tag: *[tag_length]u8, m: []const u8, ad: []const u8, npub: [nonce_length]u8, k: [key_length]u8) void {
    debug.assert(c.len == m.len);
    const extended = extend(rounds, k, npub);
    var block0 = [_]u8{0} ** 64;
    const mlen0 = @min(32, m.len);
    @memcpy(block0[32..][0..mlen0], m[0..mlen0]);
    Salsa20.xor(block0[0..], block0[0..], 0, extended.key, extended.nonce);
    @memcpy(c[0..mlen0], block0[32..][0..mlen0]);
    Salsa20.xor(c[mlen0..], m[mlen0..], 1, extended.key, extended.nonce);
    var mac = Poly1305.init(block0[0..32]);
    mac.update(ad);
    mac.update(c);
    mac.final(tag);
}  