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1 /* This file is in the public domain. */
2
3 #include <sys/cdefs.h>
4 #include <crypto/chacha20/chacha.h>
5 #include <opencrypto/xform_enc.h>
6
7 static int
8 chacha20_xform_setkey(void *ctx, const uint8_t *key, int len)
9 {
10
11         if (len != CHACHA_MINKEYLEN && len != 32)
12                 return (EINVAL);
13
14         chacha_keysetup(ctx, key, len * 8);
15         return (0);
16 }
17
18 static void
19 chacha20_xform_reinit(void *ctx, const uint8_t *iv, size_t ivlen)
20 {
21         KASSERT(ivlen == CHACHA_NONCELEN + CHACHA_CTRLEN,
22             ("%s: invalid IV length", __func__));
23         chacha_ivsetup(ctx, iv + 8, iv);
24 }
25
26 static void
27 chacha20_xform_crypt(void *ctx, const uint8_t *in, uint8_t *out)
28 {
29
30         chacha_encrypt_bytes(ctx, in, out, CHACHA_BLOCKLEN);
31 }
32
33 static void
34 chacha20_xform_crypt_multi(void *ctx, const uint8_t *in, uint8_t *out,
35     size_t len)
36 {
37         KASSERT(len % CHACHA_BLOCKLEN == 0, ("%s: invalid length", __func__));
38         chacha_encrypt_bytes(ctx, in, out, len);
39 }
40
41 static void
42 chacha20_xform_crypt_last(void *ctx, const uint8_t *in, uint8_t *out,
43     size_t len)
44 {
45
46         chacha_encrypt_bytes(ctx, in, out, len);
47 }
48
49 const struct enc_xform enc_xform_chacha20 = {
50         .type = CRYPTO_CHACHA20,
51         .name = "chacha20",
52         .ctxsize = sizeof(struct chacha_ctx),
53         .blocksize = 1,
54         .native_blocksize = CHACHA_BLOCKLEN,
55         .ivsize = CHACHA_NONCELEN + CHACHA_CTRLEN,
56         .minkey = CHACHA_MINKEYLEN,
57         .maxkey = 32,
58         .setkey = chacha20_xform_setkey,
59         .reinit = chacha20_xform_reinit,
60         .encrypt = chacha20_xform_crypt,
61         .decrypt = chacha20_xform_crypt,
62         .encrypt_multi = chacha20_xform_crypt_multi,
63         .decrypt_multi = chacha20_xform_crypt_multi,
64         .encrypt_last = chacha20_xform_crypt_last,
65         .decrypt_last = chacha20_xform_crypt_last,
66 };