4 files changed, 60 insertions, 9 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;
                 }
diff --git a/crypto/internal.h b/crypto/internal.h
index 37aa652ce5ce..959e602909a6 100644
--- a/crypto/internal.h
+++ b/crypto/internal.h
@@ -2,6 +2,7 @@
  * Cryptographic API.
  *
  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
+ * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
@@ -16,10 +17,15 @@
 #include <linux/highmem.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>
+#include <linux/list.h>
 #include <linux/kernel.h>
+#include <linux/rwsem.h>
 #include <linux/slab.h>
 #include <asm/kmap_types.h>
 
+extern struct list_head crypto_alg_list;
+extern struct rw_semaphore crypto_alg_sem;
+
 extern enum km_type crypto_km_types[];
 
 static inline enum km_type crypto_kmap_type(int out)
diff --git a/crypto/proc.c b/crypto/proc.c
index 630ba91c08f1..c0a5dd7ce2cc 100644
--- a/crypto/proc.c
+++ b/crypto/proc.c
@@ -4,6 +4,7 @@
  * Procfs information.
  *
  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
+ * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
@@ -18,9 +19,6 @@
 #include <linux/seq_file.h>
 #include "internal.h"
 
-extern struct list_head crypto_alg_list;
-extern struct rw_semaphore crypto_alg_sem;
-
 static void *c_start(struct seq_file *m, loff_t *pos)
 {
         struct list_head *v;
@@ -53,7 +51,9 @@ static int c_show(struct seq_file *m, void *p)
         struct crypto_alg *alg = (struct crypto_alg *)p;
         
         seq_printf(m, "name         : %s\n", alg->cra_name);
+        seq_printf(m, "driver       : %s\n", alg->cra_driver_name);
         seq_printf(m, "module       : %s\n", module_name(alg->cra_module));
+        seq_printf(m, "priority     : %d\n", alg->cra_priority);
         
         switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
         case CRYPTO_ALG_TYPE_CIPHER:
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 3c89df6e7768..d88bf8aa8b47 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -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.
@@ -126,7 +127,11 @@ struct crypto_alg {
         unsigned int cra_blocksize;
         unsigned int cra_ctxsize;
         unsigned int cra_alignmask;
+
+        int cra_priority;
+
         const char cra_name[CRYPTO_MAX_ALG_NAME];
+        const char cra_driver_name[CRYPTO_MAX_ALG_NAME];
 
         union {
                 struct cipher_alg cipher;