2.4.22

 crypto

diff -urN linux-2.4.21/crypto/api.c linux-2.4.22/crypto/api.c
--- linux-2.4.21/crypto/api.c   1969-12-31 16:00:00.000000000 -0800
+++ linux-2.4.22/crypto/api.c   2003-08-25 04:44:40.000000000 -0700
@@ -0,0 +1,227 @@
+/*
+ * Scatterlist Cryptographic API.
+ *
+ * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
+ * Copyright (c) 2002 David S. Miller (davem@redhat.com)
+ *
+ * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
+ * and Nettle, by Niels Möller.
+ *
+ * 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
+ * Software Foundation; either version 2 of the License, or (at your option) 
+ * any later version.
+ *
+ */
+#include <linux/init.h>
+#include <linux/crypto.h>
+#include <linux/errno.h>
+#include <linux/rwsem.h>
+#include <linux/slab.h>
+#include "internal.h"
+
+LIST_HEAD(crypto_alg_list);
+DECLARE_RWSEM(crypto_alg_sem);
+
+static inline int crypto_alg_get(struct crypto_alg *alg)
+{
+   return try_inc_mod_count(alg->cra_module);
+}
+
+static inline void crypto_alg_put(struct crypto_alg *alg)
+{
+   if (alg->cra_module)
+      __MOD_DEC_USE_COUNT(alg->cra_module);
+}
+
+struct crypto_alg *crypto_alg_lookup(const char *name)
+{
+   struct crypto_alg *q, *alg = NULL;
+   
+   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;
+         break;
+      }
+   }
+   
+   up_read(&crypto_alg_sem);
+   return alg;
+}
+
+static int crypto_init_flags(struct crypto_tfm *tfm, u32 flags)
+{
+   tfm->crt_flags = 0;
+   
+   switch (crypto_tfm_alg_type(tfm)) {
+   case CRYPTO_ALG_TYPE_CIPHER:
+      return crypto_init_cipher_flags(tfm, flags);
+      
+   case CRYPTO_ALG_TYPE_DIGEST:
+      return crypto_init_digest_flags(tfm, flags);
+      
+   case CRYPTO_ALG_TYPE_COMPRESS:
+      return crypto_init_compress_flags(tfm, flags);
+   
+   default:
+      break;
+   }
+   
+   BUG();
+   return -EINVAL;
+}
+
+static int crypto_init_ops(struct crypto_tfm *tfm)
+{
+   switch (crypto_tfm_alg_type(tfm)) {
+   case CRYPTO_ALG_TYPE_CIPHER:
+      return crypto_init_cipher_ops(tfm);
+      
+   case CRYPTO_ALG_TYPE_DIGEST:
+      return crypto_init_digest_ops(tfm);
+      
+   case CRYPTO_ALG_TYPE_COMPRESS:
+      return crypto_init_compress_ops(tfm);
+   
+   default:
+      break;
+   }
+   
+   BUG();
+   return -EINVAL;
+}
+
+static void crypto_exit_ops(struct crypto_tfm *tfm)
+{
+   switch (crypto_tfm_alg_type(tfm)) {
+   case CRYPTO_ALG_TYPE_CIPHER:
+      crypto_exit_cipher_ops(tfm);
+      break;
+      
+   case CRYPTO_ALG_TYPE_DIGEST:
+      crypto_exit_digest_ops(tfm);
+      break;
+      
+   case CRYPTO_ALG_TYPE_COMPRESS:
+      crypto_exit_compress_ops(tfm);
+      break;
+   
+   default:
+      BUG();
+      
+   }
+}
+
+struct crypto_tfm *crypto_alloc_tfm(const char *name, u32 flags)
+{
+   struct crypto_tfm *tfm = NULL;
+   struct crypto_alg *alg;
+
+   alg = crypto_alg_mod_lookup(name);
+   if (alg == NULL)
+      goto out;
+   
+   tfm = kmalloc(sizeof(*tfm) + alg->cra_ctxsize, GFP_KERNEL);
+   if (tfm == NULL)
+      goto out_put;
+
+   memset(tfm, 0, sizeof(*tfm) + alg->cra_ctxsize);
+   
+   tfm->__crt_alg = alg;
+   
+   if (crypto_init_flags(tfm, flags))
+      goto out_free_tfm;
+      
+   if (crypto_init_ops(tfm)) {
+      crypto_exit_ops(tfm);
+      goto out_free_tfm;
+   }
+
+   goto out;
+
+out_free_tfm:
+   kfree(tfm);
+   tfm = NULL;
+out_put:
+   crypto_alg_put(alg);
+out:
+   return tfm;
+}
+
+void crypto_free_tfm(struct crypto_tfm *tfm)
+{
+   crypto_exit_ops(tfm);
+   crypto_alg_put(tfm->__crt_alg);
+   kfree(tfm);
+}
+
+int crypto_register_alg(struct crypto_alg *alg)
+{
+   int ret = 0;
+   struct crypto_alg *q;
+   
+   down_write(&crypto_alg_sem);
+   
+   list_for_each_entry(q, &crypto_alg_list, cra_list) {
+      if (!(strcmp(q->cra_name, alg->cra_name))) {
+         ret = -EEXIST;
+         goto out;
+      }
+   }
+   
+   list_add_tail(&alg->cra_list, &crypto_alg_list);
+out:   
+   up_write(&crypto_alg_sem);
+   return ret;
+}
+
+int crypto_unregister_alg(struct crypto_alg *alg)
+{
+   int ret = -ENOENT;
+   struct crypto_alg *q;
+   
+   BUG_ON(!alg->cra_module);
+   
+   down_write(&crypto_alg_sem);
+   list_for_each_entry(q, &crypto_alg_list, cra_list) {
+      if (alg == q) {
+         list_del(&alg->cra_list);
+         ret = 0;
+         goto out;
+      }
+   }
+out:   
+   up_write(&crypto_alg_sem);
+   return ret;
+}
+
+int crypto_alg_available(const char *name, u32 flags)
+{
+   int ret = 0;
+   struct crypto_alg *alg = crypto_alg_mod_lookup(name);
+   
+   if (alg) {
+      crypto_alg_put(alg);
+      ret = 1;
+   }
+   
+   return ret;
+}
+
+static int __init init_crypto(void)
+{
+   printk(KERN_INFO "Initializing Cryptographic API\n");
+   crypto_init_proc();
+   return 0;
+}
+
+__initcall(init_crypto);
+
+EXPORT_SYMBOL_GPL(crypto_register_alg);
+EXPORT_SYMBOL_GPL(crypto_unregister_alg);
+EXPORT_SYMBOL_GPL(crypto_alloc_tfm);
+EXPORT_SYMBOL_GPL(crypto_free_tfm);
+EXPORT_SYMBOL_GPL(crypto_alg_available);