Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 225 insertions, 0 deletions

diff --git a/crypto/crypto_null.c b/crypto/crypto_null.c
new file mode 100644
index 000000000..5b84b0f7c
--- /dev/null
+++ b/crypto/crypto_null.c
@@ -0,0 +1,225 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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>
+ */
+
+#include <crypto/null.h>
+#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>
+
+static DEFINE_MUTEX(crypto_default_null_skcipher_lock);
+static struct crypto_sync_skcipher *crypto_default_null_skcipher;
+static int crypto_default_null_skcipher_refcnt;
+
+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_skcipher_setkey(struct crypto_skcipher *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 null_skcipher_crypt(struct skcipher_request *req)
+{
+	struct skcipher_walk walk;
+	int err;
+
+	err = skcipher_walk_virt(&walk, req, false);
+
+	while (walk.nbytes) {
+		if (walk.src.virt.addr != walk.dst.virt.addr)
+			memcpy(walk.dst.virt.addr, walk.src.virt.addr,
+			       walk.nbytes);
+		err = skcipher_walk_done(&walk, 0);
+	}
+
+	return err;
+}
+
+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_driver_name	=	"digest_null-generic",
+		.cra_blocksize		=	NULL_BLOCK_SIZE,
+		.cra_module		=	THIS_MODULE,
+	}
+};
+
+static struct skcipher_alg skcipher_null = {
+	.base.cra_name		=	"ecb(cipher_null)",
+	.base.cra_driver_name	=	"ecb-cipher_null",
+	.base.cra_priority	=	100,
+	.base.cra_blocksize	=	NULL_BLOCK_SIZE,
+	.base.cra_ctxsize	=	0,
+	.base.cra_module	=	THIS_MODULE,
+	.min_keysize		=	NULL_KEY_SIZE,
+	.max_keysize		=	NULL_KEY_SIZE,
+	.ivsize			=	NULL_IV_SIZE,
+	.setkey			=	null_skcipher_setkey,
+	.encrypt		=	null_skcipher_crypt,
+	.decrypt		=	null_skcipher_crypt,
+};
+
+static struct crypto_alg null_algs[] = { {
+	.cra_name		=	"cipher_null",
+	.cra_driver_name	=	"cipher_null-generic",
+	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,
+	.cra_blocksize		=	NULL_BLOCK_SIZE,
+	.cra_ctxsize		=	0,
+	.cra_module		=	THIS_MODULE,
+	.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 } }
+}, {
+	.cra_name		=	"compress_null",
+	.cra_driver_name	=	"compress_null-generic",
+	.cra_flags		=	CRYPTO_ALG_TYPE_COMPRESS,
+	.cra_blocksize		=	NULL_BLOCK_SIZE,
+	.cra_ctxsize		=	0,
+	.cra_module		=	THIS_MODULE,
+	.cra_u			=	{ .compress = {
+	.coa_compress		=	null_compress,
+	.coa_decompress		=	null_compress } }
+} };
+
+MODULE_ALIAS_CRYPTO("compress_null");
+MODULE_ALIAS_CRYPTO("digest_null");
+MODULE_ALIAS_CRYPTO("cipher_null");
+
+struct crypto_sync_skcipher *crypto_get_default_null_skcipher(void)
+{
+	struct crypto_sync_skcipher *tfm;
+
+	mutex_lock(&crypto_default_null_skcipher_lock);
+	tfm = crypto_default_null_skcipher;
+
+	if (!tfm) {
+		tfm = crypto_alloc_sync_skcipher("ecb(cipher_null)", 0, 0);
+		if (IS_ERR(tfm))
+			goto unlock;
+
+		crypto_default_null_skcipher = tfm;
+	}
+
+	crypto_default_null_skcipher_refcnt++;
+
+unlock:
+	mutex_unlock(&crypto_default_null_skcipher_lock);
+
+	return tfm;
+}
+EXPORT_SYMBOL_GPL(crypto_get_default_null_skcipher);
+
+void crypto_put_default_null_skcipher(void)
+{
+	mutex_lock(&crypto_default_null_skcipher_lock);
+	if (!--crypto_default_null_skcipher_refcnt) {
+		crypto_free_sync_skcipher(crypto_default_null_skcipher);
+		crypto_default_null_skcipher = NULL;
+	}
+	mutex_unlock(&crypto_default_null_skcipher_lock);
+}
+EXPORT_SYMBOL_GPL(crypto_put_default_null_skcipher);
+
+static int __init crypto_null_mod_init(void)
+{
+	int ret = 0;
+
+	ret = crypto_register_algs(null_algs, ARRAY_SIZE(null_algs));
+	if (ret < 0)
+		goto out;
+
+	ret = crypto_register_shash(&digest_null);
+	if (ret < 0)
+		goto out_unregister_algs;
+
+	ret = crypto_register_skcipher(&skcipher_null);
+	if (ret < 0)
+		goto out_unregister_shash;
+
+	return 0;
+
+out_unregister_shash:
+	crypto_unregister_shash(&digest_null);
+out_unregister_algs:
+	crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs));
+out:
+	return ret;
+}
+
+static void __exit crypto_null_mod_fini(void)
+{
+	crypto_unregister_algs(null_algs, ARRAY_SIZE(null_algs));
+	crypto_unregister_shash(&digest_null);
+	crypto_unregister_skcipher(&skcipher_null);
+}
+
+subsys_initcall(crypto_null_mod_init);
+module_exit(crypto_null_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Null Cryptographic Algorithms");