xref: /OK3568_Linux_fs/kernel/include/crypto/gcm.h (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun #ifndef _CRYPTO_GCM_H
2*4882a593Smuzhiyun #define _CRYPTO_GCM_H
3*4882a593Smuzhiyun 
4*4882a593Smuzhiyun #include <linux/errno.h>
5*4882a593Smuzhiyun 
6*4882a593Smuzhiyun #define GCM_AES_IV_SIZE 12
7*4882a593Smuzhiyun #define GCM_RFC4106_IV_SIZE 8
8*4882a593Smuzhiyun #define GCM_RFC4543_IV_SIZE 8
9*4882a593Smuzhiyun 
10*4882a593Smuzhiyun /*
11*4882a593Smuzhiyun  * validate authentication tag for GCM
12*4882a593Smuzhiyun  */
crypto_gcm_check_authsize(unsigned int authsize)13*4882a593Smuzhiyun static inline int crypto_gcm_check_authsize(unsigned int authsize)
14*4882a593Smuzhiyun {
15*4882a593Smuzhiyun 	switch (authsize) {
16*4882a593Smuzhiyun 	case 4:
17*4882a593Smuzhiyun 	case 8:
18*4882a593Smuzhiyun 	case 12:
19*4882a593Smuzhiyun 	case 13:
20*4882a593Smuzhiyun 	case 14:
21*4882a593Smuzhiyun 	case 15:
22*4882a593Smuzhiyun 	case 16:
23*4882a593Smuzhiyun 		break;
24*4882a593Smuzhiyun 	default:
25*4882a593Smuzhiyun 		return -EINVAL;
26*4882a593Smuzhiyun 	}
27*4882a593Smuzhiyun 
28*4882a593Smuzhiyun 	return 0;
29*4882a593Smuzhiyun }
30*4882a593Smuzhiyun 
31*4882a593Smuzhiyun /*
32*4882a593Smuzhiyun  * validate authentication tag for RFC4106
33*4882a593Smuzhiyun  */
crypto_rfc4106_check_authsize(unsigned int authsize)34*4882a593Smuzhiyun static inline int crypto_rfc4106_check_authsize(unsigned int authsize)
35*4882a593Smuzhiyun {
36*4882a593Smuzhiyun 	switch (authsize) {
37*4882a593Smuzhiyun 	case 8:
38*4882a593Smuzhiyun 	case 12:
39*4882a593Smuzhiyun 	case 16:
40*4882a593Smuzhiyun 		break;
41*4882a593Smuzhiyun 	default:
42*4882a593Smuzhiyun 		return -EINVAL;
43*4882a593Smuzhiyun 	}
44*4882a593Smuzhiyun 
45*4882a593Smuzhiyun 	return 0;
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun 
48*4882a593Smuzhiyun /*
49*4882a593Smuzhiyun  * validate assoclen for RFC4106/RFC4543
50*4882a593Smuzhiyun  */
crypto_ipsec_check_assoclen(unsigned int assoclen)51*4882a593Smuzhiyun static inline int crypto_ipsec_check_assoclen(unsigned int assoclen)
52*4882a593Smuzhiyun {
53*4882a593Smuzhiyun 	switch (assoclen) {
54*4882a593Smuzhiyun 	case 16:
55*4882a593Smuzhiyun 	case 20:
56*4882a593Smuzhiyun 		break;
57*4882a593Smuzhiyun 	default:
58*4882a593Smuzhiyun 		return -EINVAL;
59*4882a593Smuzhiyun 	}
60*4882a593Smuzhiyun 
61*4882a593Smuzhiyun 	return 0;
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun #endif
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