5 ccpolyotk(Chachastate *cs, DigestState *ds)
7 uchar otk[ChachaBsize];
9 memset(ds, 0, sizeof(*ds));
11 chacha_setblock(cs, 0);
12 chacha_encrypt(otk, ChachaBsize, cs);
13 poly1305(nil, 0, otk, 32, nil, ds);
17 ccpolypad(uchar *buf, ulong nbuf, DigestState *ds)
19 static uchar zeros[16] = {0};
24 poly1305(buf, nbuf, nil, 0, nil, ds);
28 poly1305(zeros, 16 - npad, nil, 0, nil, ds);
32 ccpolylen(ulong n, uchar tag[16], DigestState *ds)
44 poly1305(info, 8, nil, 0, tag, ds);
48 ccpoly_encrypt(uchar *dat, ulong ndat, uchar *aad, ulong naad, uchar tag[16], Chachastate *cs)
54 poly1305(aad, naad, nil, 0, nil, &ds);
55 ccpolylen(naad, nil, &ds);
56 chacha_encrypt(dat, ndat, cs);
57 poly1305(dat, ndat, nil, 0, nil, &ds);
58 ccpolylen(ndat, tag, &ds);
60 ccpolypad(aad, naad, &ds);
61 chacha_encrypt(dat, ndat, cs);
62 ccpolypad(dat, ndat, &ds);
63 ccpolylen(naad, nil, &ds);
64 ccpolylen(ndat, tag, &ds);
69 ccpoly_decrypt(uchar *dat, ulong ndat, uchar *aad, ulong naad, uchar tag[16], Chachastate *cs)
76 poly1305(aad, naad, nil, 0, nil, &ds);
77 ccpolylen(naad, nil, &ds);
78 poly1305(dat, ndat, nil, 0, nil, &ds);
79 ccpolylen(ndat, tmp, &ds);
81 ccpolypad(aad, naad, &ds);
82 ccpolypad(dat, ndat, &ds);
83 ccpolylen(naad, nil, &ds);
84 ccpolylen(ndat, tmp, &ds);
86 if(tsmemcmp(tag, tmp, 16) != 0)
88 chacha_encrypt(dat, ndat, cs);