initial_commit

1 files changed, 207 insertions, 0 deletions

diff --git a/crypto/crypto_null.c b/crypto/crypto_null.c
new file mode 100644
index 00000000..07a8a96d
--- /dev/null
+++ b/crypto/crypto_null.c
@@ -0,0 +1,207 @@
+/*
+ * 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 <crypto/internal/hash.h>
+#include <crypto/internal/skcipher.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mm.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)
+{
+	if (slen > *dlen)
+		return -EINVAL;
+	memcpy(dst, src, slen);
+	*dlen = slen;
+	return 0;
+}
+
+static int null_init(struct shash_desc *desc)
+{
+	return 0;
+}
+
+static int null_update(struct shash_desc *desc, const u8 *data,
+		       unsigned int len)
+{
+	return 0;
+}
+
+static int null_final(struct shash_desc *desc, u8 *out)
+{
+	return 0;
+}
+
+static int null_digest(struct shash_desc *desc, const u8 *data,
+		       unsigned int len, u8 *out)
+{
+	return 0;
+}
+
+static int null_hash_setkey(struct crypto_shash *tfm, const u8 *key,
+			    unsigned int keylen)
+{ return 0; }
+
+static int null_setkey(struct crypto_tfm *tfm, const u8 *key,
+		       unsigned int keylen)
+{ return 0; }
+
+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,
+	.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_compress } }
+};
+
+static struct shash_alg digest_null = {
+	.digestsize		=	NULL_DIGEST_SIZE,
+	.setkey   		=	null_hash_setkey,
+	.init   		=	null_init,
+	.update 		=	null_update,
+	.finup 			=	null_digest,
+	.digest 		=	null_digest,
+	.final  		=	null_final,
+	.base			=	{
+		.cra_name		=	"digest_null",
+		.cra_flags		=	CRYPTO_ALG_TYPE_SHASH,
+		.cra_blocksize		=	NULL_BLOCK_SIZE,
+		.cra_module		=	THIS_MODULE,
+	}
+};
+
+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_crypt,
+	.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 crypto_null_mod_init(void)
+{
+	int ret = 0;
+
+	ret = crypto_register_alg(&cipher_null);
+	if (ret < 0)
+		goto out;
+
+	ret = crypto_register_alg(&skcipher_null);
+	if (ret < 0)
+		goto out_unregister_cipher;
+
+	ret = crypto_register_shash(&digest_null);
+	if (ret < 0)
+		goto out_unregister_skcipher;
+
+	ret = crypto_register_alg(&compress_null);
+	if (ret < 0)
+		goto out_unregister_digest;
+
+out:
+	return ret;
+
+out_unregister_digest:
+	crypto_unregister_shash(&digest_null);
+out_unregister_skcipher:
+	crypto_unregister_alg(&skcipher_null);
+out_unregister_cipher:
+	crypto_unregister_alg(&cipher_null);
+	goto out;
+}
+
+static void __exit crypto_null_mod_fini(void)
+{
+	crypto_unregister_alg(&compress_null);
+	crypto_unregister_shash(&digest_null);
+	crypto_unregister_alg(&skcipher_null);
+	crypto_unregister_alg(&cipher_null);
+}
+
+module_init(crypto_null_mod_init);
+module_exit(crypto_null_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Null Cryptographic Algorithms");