[PATCH v1 3/4] keys, trusted: select the hash algorithm

[Jarkko Sakkinen]

Added 'hash=' option for selecting the hash algorithm for add_key()
syscall.

Signed-off-by: Jarkko Sakkinen <jarkko.sakki...@linux.intel.com>
---
 security/keys/trusted.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/security/keys/trusted.c b/security/keys/trusted.c
index d3633cf..7a87bcd 100644
--- a/security/keys/trusted.c
+++ b/security/keys/trusted.c
@@ -11,6 +11,7 @@
  * See Documentation/security/keys-trusted-encrypted.txt
  */
 
+#include <crypto/hash_info.h>
 #include <linux/uaccess.h>
 #include <linux/module.h>
 #include <linux/init.h>
@@ -710,7 +711,8 @@ enum {
        Opt_err = -1,
        Opt_new, Opt_load, Opt_update,
        Opt_keyhandle, Opt_keyauth, Opt_blobauth,
-       Opt_pcrinfo, Opt_pcrlock, Opt_migratable
+       Opt_pcrinfo, Opt_pcrlock, Opt_migratable,
+       Opt_hash,
 };
 
 static const match_table_t key_tokens = {
@@ -723,6 +725,7 @@ static const match_table_t key_tokens = {
        {Opt_pcrinfo, "pcrinfo=%s"},
        {Opt_pcrlock, "pcrlock=%s"},
        {Opt_migratable, "migratable=%s"},
+       {Opt_hash, "hash=%s"},
        {Opt_err, NULL}
 };
 
@@ -736,6 +739,7 @@ static int getoptions(char *c, struct trusted_key_payload 
*pay,
        int res;
        unsigned long handle;
        unsigned long lock;
+       int i;
 
        while ((p = strsep(&c, " \t"))) {
                if (*p == '\0' || *p == ' ' || *p == '\t')
@@ -787,6 +791,20 @@ static int getoptions(char *c, struct trusted_key_payload 
*pay,
                                return -EINVAL;
                        opt->pcrlock = lock;
                        break;
+               case Opt_hash:
+                       for (i = 0; i < HASH_ALGO__LAST; i++) {
+                               if (!strcmp(args[0].from, hash_algo_name[i])) {
+                                       opt->hash = i;
+                                       break;
+                               }
+                       }
+                       res = tpm_is_tpm2(TPM_ANY_NUM);
+                       if (res < 0)
+                               return res;
+                       if (i == HASH_ALGO__LAST ||
+                           (!res && i != HASH_ALGO_SHA1))
+                               return -EINVAL;
+                       break;
                default:
                        return -EINVAL;
                }
-- 
2.5.0

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