CRED: Wrap task credential accesses in the core kernel
[linux-2.6.git] / crypto / crypto_null.c
index 29f7747..1f7d530 100644 (file)
  * (at your option) any later version.
  *
  */
+
+#include <crypto/internal/skcipher.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/mm.h>
-#include <linux/crypto.h>
 #include <linux/string.h>
 
 #define NULL_KEY_SIZE          0
 #define NULL_BLOCK_SIZE                1
 #define NULL_DIGEST_SIZE       0
+#define NULL_IV_SIZE           0
 
 static int null_compress(struct crypto_tfm *tfm, const u8 *src,
                         unsigned int slen, u8 *dst, unsigned int *dlen)
@@ -55,6 +57,26 @@ static void null_crypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
        memcpy(dst, src, NULL_BLOCK_SIZE);
 }
 
+static int skcipher_null_crypt(struct blkcipher_desc *desc,
+                              struct scatterlist *dst,
+                              struct scatterlist *src, unsigned int nbytes)
+{
+       struct blkcipher_walk walk;
+       int err;
+
+       blkcipher_walk_init(&walk, dst, src, nbytes);
+       err = blkcipher_walk_virt(desc, &walk);
+
+       while (walk.nbytes) {
+               if (walk.src.virt.addr != walk.dst.virt.addr)
+                       memcpy(walk.dst.virt.addr, walk.src.virt.addr,
+                              walk.nbytes);
+               err = blkcipher_walk_done(desc, &walk, 0);
+       }
+
+       return err;
+}
+
 static struct crypto_alg compress_null = {
        .cra_name               =       "compress_null",
        .cra_flags              =       CRYPTO_ALG_TYPE_COMPRESS,
@@ -76,6 +98,7 @@ static struct crypto_alg digest_null = {
        .cra_list               =       LIST_HEAD_INIT(digest_null.cra_list),   
        .cra_u                  =       { .digest = {
        .dia_digestsize         =       NULL_DIGEST_SIZE,
+       .dia_setkey             =       null_setkey,
        .dia_init               =       null_init,
        .dia_update             =       null_update,
        .dia_final              =       null_final } }
@@ -96,11 +119,30 @@ static struct crypto_alg cipher_null = {
        .cia_decrypt            =       null_crypt } }
 };
 
+static struct crypto_alg skcipher_null = {
+       .cra_name               =       "ecb(cipher_null)",
+       .cra_driver_name        =       "ecb-cipher_null",
+       .cra_priority           =       100,
+       .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER,
+       .cra_blocksize          =       NULL_BLOCK_SIZE,
+       .cra_type               =       &crypto_blkcipher_type,
+       .cra_ctxsize            =       0,
+       .cra_module             =       THIS_MODULE,
+       .cra_list               =       LIST_HEAD_INIT(skcipher_null.cra_list),
+       .cra_u                  =       { .blkcipher = {
+       .min_keysize            =       NULL_KEY_SIZE,
+       .max_keysize            =       NULL_KEY_SIZE,
+       .ivsize                 =       NULL_IV_SIZE,
+       .setkey                 =       null_setkey,
+       .encrypt                =       skcipher_null_crypt,
+       .decrypt                =       skcipher_null_crypt } }
+};
+
 MODULE_ALIAS("compress_null");
 MODULE_ALIAS("digest_null");
 MODULE_ALIAS("cipher_null");
 
-static int __init init(void)
+static int __init crypto_null_mod_init(void)
 {
        int ret = 0;
        
@@ -108,32 +150,40 @@ static int __init init(void)
        if (ret < 0)
                goto out;
 
+       ret = crypto_register_alg(&skcipher_null);
+       if (ret < 0)
+               goto out_unregister_cipher;
+
        ret = crypto_register_alg(&digest_null);
-       if (ret < 0) {
-               crypto_unregister_alg(&cipher_null);
-               goto out;
-       }
+       if (ret < 0)
+               goto out_unregister_skcipher;
 
        ret = crypto_register_alg(&compress_null);
-       if (ret < 0) {
-               crypto_unregister_alg(&digest_null);
-               crypto_unregister_alg(&cipher_null);
-               goto out;
-       }
+       if (ret < 0)
+               goto out_unregister_digest;
 
 out:   
        return ret;
+
+out_unregister_digest:
+       crypto_unregister_alg(&digest_null);
+out_unregister_skcipher:
+       crypto_unregister_alg(&skcipher_null);
+out_unregister_cipher:
+       crypto_unregister_alg(&cipher_null);
+       goto out;
 }
 
-static void __exit fini(void)
+static void __exit crypto_null_mod_fini(void)
 {
        crypto_unregister_alg(&compress_null);
        crypto_unregister_alg(&digest_null);
+       crypto_unregister_alg(&skcipher_null);
        crypto_unregister_alg(&cipher_null);
 }
 
-module_init(init);
-module_exit(fini);
+module_init(crypto_null_mod_init);
+module_exit(crypto_null_mod_fini);
 
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Null Cryptographic Algorithms");