1 files changed, 46 insertions, 6 deletions

diff --git a/crypto/api.c b/crypto/api.c
index 40ae42e9b6a6..2715afdf678c 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -3,6 +3,7 @@
  *
  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  * Copyright (c) 2002 David S. Miller (davem@redhat.com)
+ * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
  *
  * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
  * and Nettle, by Niels Möller.
@@ -18,9 +19,11 @@
 #include <linux/init.h>
 #include <linux/crypto.h>
 #include <linux/errno.h>
+#include <linux/kernel.h>
 #include <linux/kmod.h>
 #include <linux/rwsem.h>
 #include <linux/slab.h>
+#include <linux/string.h>
 #include "internal.h"
 
 LIST_HEAD(crypto_alg_list);
@@ -39,6 +42,7 @@ static inline void crypto_alg_put(struct crypto_alg *alg)
 static struct crypto_alg *crypto_alg_lookup(const char *name)
 {
         struct crypto_alg *q, *alg = NULL;
+        int best = -1;
 
         if (!name)
                 return NULL;
@@ -46,11 +50,23 @@ static struct crypto_alg *crypto_alg_lookup(const char *name)
         down_read(&crypto_alg_sem);
         
         list_for_each_entry(q, &crypto_alg_list, cra_list) {
-                if (!(strcmp(q->cra_name, name))) {
-                        if (crypto_alg_get(q))
-                                alg = q;
+                int exact, fuzzy;
+
+                exact = !strcmp(q->cra_driver_name, name);
+                fuzzy = !strcmp(q->cra_name, name);
+                if (!exact && !(fuzzy && q->cra_priority > best))
+                        continue;
+
+                if (unlikely(!crypto_alg_get(q)))
+                        continue;
+
+                best = q->cra_priority;
+                if (alg)
+                        crypto_alg_put(alg);
+                alg = q;
+
+                if (exact)
                         break;
-                }
         }
         
         up_read(&crypto_alg_sem);
@@ -207,9 +223,26 @@ void crypto_free_tfm(struct crypto_tfm *tfm)
         kfree(tfm);
 }
 
+static inline int crypto_set_driver_name(struct crypto_alg *alg)
+{
+        static const char suffix[] = "-generic";
+        char *driver_name = (char *)alg->cra_driver_name;
+        int len;
+
+        if (*driver_name)
+                return 0;
+
+        len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
+        if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
+                return -ENAMETOOLONG;
+
+        memcpy(driver_name + len, suffix, sizeof(suffix));
+        return 0;
+}
+
 int crypto_register_alg(struct crypto_alg *alg)
 {
-        int ret = 0;
+        int ret;
         struct crypto_alg *q;
 
         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
@@ -220,11 +253,18 @@ int crypto_register_alg(struct crypto_alg *alg)
 
         if (alg->cra_blocksize > PAGE_SIZE)
                 return -EINVAL;
+
+        if (alg->cra_priority < 0)
+                return -EINVAL;
         
+        ret = crypto_set_driver_name(alg);
+        if (unlikely(ret))
+                return ret;
+
         down_write(&crypto_alg_sem);
         
         list_for_each_entry(q, &crypto_alg_list, cra_list) {
-                if (!(strcmp(q->cra_name, alg->cra_name))) {
+                if (!strcmp(q->cra_driver_name, alg->cra_driver_name)) {
                         ret = -EEXIST;
                         goto out;
                 }