path: root/security/integrity/evm/evm.h
diff options
authorDmitry Kasatkin <>2011-09-01 14:41:40 +0300
committerDmitry Kasatkin <>2011-11-09 16:51:14 +0200
commit15647eb3985ef30dfd657038924dc85c03026733 (patch)
tree5d4629ef3b687ff56a446f42a8ee5aa35ec9322b /security/integrity/evm/evm.h
parent8607c501478432b23654739c7321bc7456053cb6 (diff)
evm: digital signature verification support
This patch adds support for digital signature verification to EVM. With this feature file metadata can be protected using digital signature instead of an HMAC. When building an image, which has to be flashed to different devices, an HMAC cannot be used to sign file metadata, because the HMAC key should be different on every device. Signed-off-by: Dmitry Kasatkin <> Acked-by: Mimi Zohar <>
Diffstat (limited to 'security/integrity/evm/evm.h')
1 files changed, 12 insertions, 0 deletions
diff --git a/security/integrity/evm/evm.h b/security/integrity/evm/evm.h
index d320f5197437..c885247ebcf7 100644
--- a/security/integrity/evm/evm.h
+++ b/security/integrity/evm/evm.h
@@ -12,14 +12,21 @@
* File: evm.h
+#ifndef __INTEGRITY_EVM_H
+#define __INTEGRITY_EVM_H
#include <linux/xattr.h>
#include <linux/security.h>
#include "../integrity.h"
extern int evm_initialized;
extern char *evm_hmac;
+extern char *evm_hash;
extern struct crypto_shash *hmac_tfm;
+extern struct crypto_shash *hash_tfm;
/* List of EVM protected security xattrs */
extern char *evm_config_xattrnames[];
@@ -32,7 +39,12 @@ extern int evm_update_evmxattr(struct dentry *dentry,
extern int evm_calc_hmac(struct dentry *dentry, const char *req_xattr_name,
const char *req_xattr_value,
size_t req_xattr_value_len, char *digest);
+extern int evm_calc_hash(struct dentry *dentry, const char *req_xattr_name,
+ const char *req_xattr_value,
+ size_t req_xattr_value_len, char *digest);
extern int evm_init_hmac(struct inode *inode, const struct xattr *xattr,
char *hmac_val);
extern int evm_init_secfs(void);
extern void evm_cleanup_secfs(void);