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Merge llvm-project main llvmorg-15-init-17485-ga3e38b4a206b
[FreeBSD/FreeBSD.git] / sys / crypto / chacha20 / chacha-sw.c
1 /* This file is in the public domain. */
2
3 #include <sys/cdefs.h>
4 __FBSDID("$FreeBSD$");
5
6 #include <crypto/chacha20/chacha.h>
7 #include <opencrypto/xform_enc.h>
8
9 static int
10 chacha20_xform_setkey(void *ctx, const uint8_t *key, int len)
11 {
12
13         if (len != CHACHA_MINKEYLEN && len != 32)
14                 return (EINVAL);
15
16         chacha_keysetup(ctx, key, len * 8);
17         return (0);
18 }
19
20 static void
21 chacha20_xform_reinit(void *ctx, const uint8_t *iv, size_t ivlen)
22 {
23         KASSERT(ivlen == CHACHA_NONCELEN + CHACHA_CTRLEN,
24             ("%s: invalid IV length", __func__));
25         chacha_ivsetup(ctx, iv + 8, iv);
26 }
27
28 static void
29 chacha20_xform_crypt(void *ctx, const uint8_t *in, uint8_t *out)
30 {
31
32         chacha_encrypt_bytes(ctx, in, out, CHACHA_BLOCKLEN);
33 }
34
35 static void
36 chacha20_xform_crypt_multi(void *ctx, const uint8_t *in, uint8_t *out,
37     size_t len)
38 {
39         KASSERT(len % CHACHA_BLOCKLEN == 0, ("%s: invalid length", __func__));
40         chacha_encrypt_bytes(ctx, in, out, len);
41 }
42
43 static void
44 chacha20_xform_crypt_last(void *ctx, const uint8_t *in, uint8_t *out,
45     size_t len)
46 {
47
48         chacha_encrypt_bytes(ctx, in, out, len);
49 }
50
51 const struct enc_xform enc_xform_chacha20 = {
52         .type = CRYPTO_CHACHA20,
53         .name = "chacha20",
54         .ctxsize = sizeof(struct chacha_ctx),
55         .blocksize = 1,
56         .native_blocksize = CHACHA_BLOCKLEN,
57         .ivsize = CHACHA_NONCELEN + CHACHA_CTRLEN,
58         .minkey = CHACHA_MINKEYLEN,
59         .maxkey = 32,
60         .setkey = chacha20_xform_setkey,
61         .reinit = chacha20_xform_reinit,
62         .encrypt = chacha20_xform_crypt,
63         .decrypt = chacha20_xform_crypt,
64         .encrypt_multi = chacha20_xform_crypt_multi,
65         .decrypt_multi = chacha20_xform_crypt_multi,
66         .encrypt_last = chacha20_xform_crypt_last,
67         .decrypt_last = chacha20_xform_crypt_last,
68 };