1 files changed, 137 insertions, 0 deletions

diff --git a/crypto/crypto_null.c b/crypto/crypto_null.c
new file mode 100644
index 000000000000..f691d31fa9ee
--- /dev/null
+++ b/crypto/crypto_null.c
@@ -0,0 +1,137 @@
+/* 
+ * 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_setkey             =       null_setkey,
+        .cia_encrypt            =       null_encrypt,
+        .cia_decrypt            =       null_decrypt } }
+};
+
+MODULE_ALIAS("compress_null");
+MODULE_ALIAS("digest_null");
+MODULE_ALIAS("cipher_null");
+
+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");