1#ifndef _CRYPTO_GCM_H
 2#define _CRYPTO_GCM_H
 3
 4#include <linux/errno.h>
 5
 6#define GCM_AES_IV_SIZE 12
 7#define GCM_RFC4106_IV_SIZE 8
 8#define GCM_RFC4543_IV_SIZE 8
 9
10/*
11 * validate authentication tag for GCM
12 */
13static inline int crypto_gcm_check_authsize(unsigned int authsize)
14{
15	switch (authsize) {
16	case 4:
17	case 8:
18	case 12:
19	case 13:
20	case 14:
21	case 15:
22	case 16:
23		break;
24	default:
25		return -EINVAL;
26	}
27
28	return 0;
29}
30
31/*
32 * validate authentication tag for RFC4106
33 */
34static inline int crypto_rfc4106_check_authsize(unsigned int authsize)
35{
36	switch (authsize) {
37	case 8:
38	case 12:
39	case 16:
40		break;
41	default:
42		return -EINVAL;
43	}
44
45	return 0;
46}
47
48/*
49 * validate assoclen for RFC4106/RFC4543
50 */
51static inline int crypto_ipsec_check_assoclen(unsigned int assoclen)
52{
53	switch (assoclen) {
54	case 16:
55	case 20:
56		break;
57	default:
58		return -EINVAL;
59	}
60
61	return 0;
62}
63#endif