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Diffstat (limited to 'crypto/asymmetric_keys/asymmetric_type.c')
-rw-r--r--crypto/asymmetric_keys/asymmetric_type.c51
1 files changed, 32 insertions, 19 deletions
diff --git a/crypto/asymmetric_keys/asymmetric_type.c b/crypto/asymmetric_keys/asymmetric_type.c
index 21960a4e74e8..eb8cd46961a5 100644
--- a/crypto/asymmetric_keys/asymmetric_type.c
+++ b/crypto/asymmetric_keys/asymmetric_type.c
@@ -23,6 +23,35 @@ static LIST_HEAD(asymmetric_key_parsers);
static DECLARE_RWSEM(asymmetric_key_parsers_sem);
/*
+ * Match asymmetric key id with partial match
+ * @id: key id to match in a form "id:<id>"
+ */
+int asymmetric_keyid_match(const char *kid, const char *id)
+{
+ size_t idlen, kidlen;
+
+ if (!kid || !id)
+ return 0;
+
+ /* make it possible to use id as in the request: "id:<id>" */
+ if (strncmp(id, "id:", 3) == 0)
+ id += 3;
+
+ /* Anything after here requires a partial match on the ID string */
+ idlen = strlen(id);
+ kidlen = strlen(kid);
+ if (idlen > kidlen)
+ return 0;
+
+ kid += kidlen - idlen;
+ if (strcasecmp(id, kid) != 0)
+ return 0;
+
+ return 1;
+}
+EXPORT_SYMBOL_GPL(asymmetric_keyid_match);
+
+/*
* Match asymmetric keys on (part of) their name
* We have some shorthand methods for matching keys. We allow:
*
@@ -34,9 +63,8 @@ static int asymmetric_key_match(const struct key *key, const void *description)
{
const struct asymmetric_key_subtype *subtype = asymmetric_key_subtype(key);
const char *spec = description;
- const char *id, *kid;
+ const char *id;
ptrdiff_t speclen;
- size_t idlen, kidlen;
if (!subtype || !spec || !*spec)
return 0;
@@ -55,23 +83,8 @@ static int asymmetric_key_match(const struct key *key, const void *description)
speclen = id - spec;
id++;
- /* Anything after here requires a partial match on the ID string */
- kid = asymmetric_key_id(key);
- if (!kid)
- return 0;
-
- idlen = strlen(id);
- kidlen = strlen(kid);
- if (idlen > kidlen)
- return 0;
-
- kid += kidlen - idlen;
- if (strcasecmp(id, kid) != 0)
- return 0;
-
- if (speclen == 2 &&
- memcmp(spec, "id", 2) == 0)
- return 1;
+ if (speclen == 2 && memcmp(spec, "id", 2) == 0)
+ return asymmetric_keyid_match(asymmetric_key_id(key), id);
if (speclen == subtype->name_len &&
memcmp(spec, subtype->name, speclen) == 0)