xref: /freebsd/sys/crypto/chacha20/chacha-sw.c (revision cfd6422a5217410fbd66f7a7a8a64d9d85e61229)
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)
22 {
23 
24 	chacha_ivsetup(ctx, iv + 8, iv);
25 }
26 
27 static void
28 chacha20_xform_crypt(void *ctx, const uint8_t *in, uint8_t *out)
29 {
30 
31 	chacha_encrypt_bytes(ctx, in, out, CHACHA_BLOCKLEN);
32 }
33 
34 static void
35 chacha20_xform_crypt_last(void *ctx, const uint8_t *in, uint8_t *out,
36     size_t len)
37 {
38 
39 	chacha_encrypt_bytes(ctx, in, out, len);
40 }
41 
42 struct enc_xform enc_xform_chacha20 = {
43 	.type = CRYPTO_CHACHA20,
44 	.name = "chacha20",
45 	.ctxsize = sizeof(struct chacha_ctx),
46 	.blocksize = 1,
47 	.native_blocksize = CHACHA_BLOCKLEN,
48 	.ivsize = CHACHA_NONCELEN + CHACHA_CTRLEN,
49 	.minkey = CHACHA_MINKEYLEN,
50 	.maxkey = 32,
51 	.encrypt = chacha20_xform_crypt,
52 	.decrypt = chacha20_xform_crypt,
53 	.setkey = chacha20_xform_setkey,
54 	.reinit = chacha20_xform_reinit,
55 	.encrypt_last = chacha20_xform_crypt_last,
56 	.decrypt_last = chacha20_xform_crypt_last,
57 };
58