2.4.22

 crypto

diff -urN linux-2.4.21/crypto/crypto_null.c linux-2.4.22/crypto/crypto_null.c
--- linux-2.4.21/crypto/crypto_null.c   1969-12-31 16:00:00.000000000 -0800
+++ linux-2.4.22/crypto/crypto_null.c   2003-08-25 04:44:40.000000000 -0700
@@ -0,0 +1,134 @@
+/* 
+ * Cryptographic API.
+ *
+ * Null algorithms, aka Much Ado About Nothing.
+ *
+ * These are needed for IPsec, and may be useful in general for
+ * testing & debugging.
+ * 
+ * The null cipher is compliant with RFC2410.
+ *
+ * Copyright (c) 2002 James Morris <jmorris@intercode.com.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 Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <asm/scatterlist.h>
+#include <linux/crypto.h>
+
+#define NULL_KEY_SIZE      0
+#define NULL_BLOCK_SIZE      1
+#define NULL_DIGEST_SIZE   0
+
+static int null_compress(void *ctx, const u8 *src, unsigned int slen,
+                         u8 *dst, unsigned int *dlen)
+{ return 0; }
+
+static int null_decompress(void *ctx, const u8 *src, unsigned int slen,
+                           u8 *dst, unsigned int *dlen)
+{ return 0; }
+
+static void null_init(void *ctx)
+{ }
+
+static void null_update(void *ctx, const u8 *data, unsigned int len)
+{ }
+
+static void null_final(void *ctx, u8 *out)
+{ }
+
+static int null_setkey(void *ctx, const u8 *key,
+                       unsigned int keylen, u32 *flags)
+{ return 0; }
+
+static void null_encrypt(void *ctx, u8 *dst, const u8 *src)
+{ }
+
+static void null_decrypt(void *ctx, u8 *dst, const u8 *src)
+{ }
+
+static struct crypto_alg compress_null = {
+   .cra_name      =   "compress_null",
+   .cra_flags      =   CRYPTO_ALG_TYPE_COMPRESS,
+   .cra_blocksize      =   NULL_BLOCK_SIZE,
+   .cra_ctxsize      =   0,
+   .cra_module      =   THIS_MODULE,
+   .cra_list      =       LIST_HEAD_INIT(compress_null.cra_list),
+   .cra_u         =   { .compress = {
+   .coa_compress       =   null_compress,
+   .coa_decompress      =   null_decompress } }
+};
+
+static struct crypto_alg digest_null = {
+   .cra_name      =   "digest_null",
+   .cra_flags      =   CRYPTO_ALG_TYPE_DIGEST,
+   .cra_blocksize      =   NULL_BLOCK_SIZE,
+   .cra_ctxsize      =   0,
+   .cra_module      =   THIS_MODULE,
+   .cra_list      =       LIST_HEAD_INIT(digest_null.cra_list),   
+   .cra_u         =   { .digest = {
+   .dia_digestsize      =   NULL_DIGEST_SIZE,
+   .dia_init         =   null_init,
+   .dia_update       =   null_update,
+   .dia_final        =   null_final } }
+};
+
+static struct crypto_alg cipher_null = {
+   .cra_name      =   "cipher_null",
+   .cra_flags      =   CRYPTO_ALG_TYPE_CIPHER,
+   .cra_blocksize      =   NULL_BLOCK_SIZE,
+   .cra_ctxsize      =   0,
+   .cra_module      =   THIS_MODULE,
+   .cra_list      =   LIST_HEAD_INIT(cipher_null.cra_list),
+   .cra_u         =   { .cipher = {
+   .cia_min_keysize   =   NULL_KEY_SIZE,
+   .cia_max_keysize   =   NULL_KEY_SIZE,
+   .cia_ivsize      =   0,
+   .cia_setkey      =    null_setkey,
+   .cia_encrypt      =   null_encrypt,
+   .cia_decrypt      =   null_decrypt } }
+};
+
+static int __init init(void)
+{
+   int ret = 0;
+   
+   ret = crypto_register_alg(&cipher_null);
+   if (ret < 0)
+      goto out;
+
+   ret = crypto_register_alg(&digest_null);
+   if (ret < 0) {
+      crypto_unregister_alg(&cipher_null);
+      goto out;
+   }
+
+   ret = crypto_register_alg(&compress_null);
+   if (ret < 0) {
+      crypto_unregister_alg(&digest_null);
+      crypto_unregister_alg(&cipher_null);
+      goto out;
+   }
+
+out:   
+   return ret;
+}
+
+static void __exit fini(void)
+{
+   crypto_unregister_alg(&compress_null);
+   crypto_unregister_alg(&digest_null);
+   crypto_unregister_alg(&cipher_null);
+}
+
+module_init(init);
+module_exit(fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Null Cryptographic Algorithms");