From 65526f638efc6435b9658d45a3ddd07e6fdbbb7d Mon Sep 17 00:00:00 2001 From: Iuliana Prodan Date: Wed, 31 Jul 2019 16:05:54 +0300 Subject: crypto: gcm - helper functions for assoclen/authsize check Added inline helper functions to check authsize and assoclen for gcm, rfc4106 and rfc4543. These are used in the generic implementation of gcm, rfc4106 and rfc4543. Signed-off-by: Iuliana Prodan Signed-off-by: Herbert Xu --- include/crypto/gcm.h | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) (limited to 'include') diff --git a/include/crypto/gcm.h b/include/crypto/gcm.h index c50e057ea17e..9d7eff04f224 100644 --- a/include/crypto/gcm.h +++ b/include/crypto/gcm.h @@ -1,8 +1,63 @@ #ifndef _CRYPTO_GCM_H #define _CRYPTO_GCM_H +#include + #define GCM_AES_IV_SIZE 12 #define GCM_RFC4106_IV_SIZE 8 #define GCM_RFC4543_IV_SIZE 8 +/* + * validate authentication tag for GCM + */ +static inline int crypto_gcm_check_authsize(unsigned int authsize) +{ + switch (authsize) { + case 4: + case 8: + case 12: + case 13: + case 14: + case 15: + case 16: + break; + default: + return -EINVAL; + } + + return 0; +} + +/* + * validate authentication tag for RFC4106 + */ +static inline int crypto_rfc4106_check_authsize(unsigned int authsize) +{ + switch (authsize) { + case 8: + case 12: + case 16: + break; + default: + return -EINVAL; + } + + return 0; +} + +/* + * validate assoclen for RFC4106/RFC4543 + */ +static inline int crypto_ipsec_check_assoclen(unsigned int assoclen) +{ + switch (assoclen) { + case 16: + case 20: + break; + default: + return -EINVAL; + } + + return 0; +} #endif -- cgit v1.2.3-59-g8ed1b