Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 195 insertions, 0 deletions

diff --git a/crypto/pcbc.c b/crypto/pcbc.c
new file mode 100644
index 0000000000..7030f59e46
--- /dev/null
+++ b/crypto/pcbc.c
@@ -0,0 +1,195 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * PCBC: Propagating Cipher Block Chaining mode
+ *
+ * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * Derived from cbc.c
+ * - Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
+ */
+
+#include <crypto/algapi.h>
+#include <crypto/internal/cipher.h>
+#include <crypto/internal/skcipher.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+static int crypto_pcbc_encrypt_segment(struct skcipher_request *req,
+				       struct skcipher_walk *walk,
+				       struct crypto_cipher *tfm)
+{
+	int bsize = crypto_cipher_blocksize(tfm);
+	unsigned int nbytes = walk->nbytes;
+	u8 *src = walk->src.virt.addr;
+	u8 *dst = walk->dst.virt.addr;
+	u8 * const iv = walk->iv;
+
+	do {
+		crypto_xor(iv, src, bsize);
+		crypto_cipher_encrypt_one(tfm, dst, iv);
+		crypto_xor_cpy(iv, dst, src, bsize);
+
+		src += bsize;
+		dst += bsize;
+	} while ((nbytes -= bsize) >= bsize);
+
+	return nbytes;
+}
+
+static int crypto_pcbc_encrypt_inplace(struct skcipher_request *req,
+				       struct skcipher_walk *walk,
+				       struct crypto_cipher *tfm)
+{
+	int bsize = crypto_cipher_blocksize(tfm);
+	unsigned int nbytes = walk->nbytes;
+	u8 *src = walk->src.virt.addr;
+	u8 * const iv = walk->iv;
+	u8 tmpbuf[MAX_CIPHER_BLOCKSIZE];
+
+	do {
+		memcpy(tmpbuf, src, bsize);
+		crypto_xor(iv, src, bsize);
+		crypto_cipher_encrypt_one(tfm, src, iv);
+		crypto_xor_cpy(iv, tmpbuf, src, bsize);
+
+		src += bsize;
+	} while ((nbytes -= bsize) >= bsize);
+
+	return nbytes;
+}
+
+static int crypto_pcbc_encrypt(struct skcipher_request *req)
+{
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+	struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
+	struct skcipher_walk walk;
+	unsigned int nbytes;
+	int err;
+
+	err = skcipher_walk_virt(&walk, req, false);
+
+	while ((nbytes = walk.nbytes)) {
+		if (walk.src.virt.addr == walk.dst.virt.addr)
+			nbytes = crypto_pcbc_encrypt_inplace(req, &walk,
+							     cipher);
+		else
+			nbytes = crypto_pcbc_encrypt_segment(req, &walk,
+							     cipher);
+		err = skcipher_walk_done(&walk, nbytes);
+	}
+
+	return err;
+}
+
+static int crypto_pcbc_decrypt_segment(struct skcipher_request *req,
+				       struct skcipher_walk *walk,
+				       struct crypto_cipher *tfm)
+{
+	int bsize = crypto_cipher_blocksize(tfm);
+	unsigned int nbytes = walk->nbytes;
+	u8 *src = walk->src.virt.addr;
+	u8 *dst = walk->dst.virt.addr;
+	u8 * const iv = walk->iv;
+
+	do {
+		crypto_cipher_decrypt_one(tfm, dst, src);
+		crypto_xor(dst, iv, bsize);
+		crypto_xor_cpy(iv, dst, src, bsize);
+
+		src += bsize;
+		dst += bsize;
+	} while ((nbytes -= bsize) >= bsize);
+
+	return nbytes;
+}
+
+static int crypto_pcbc_decrypt_inplace(struct skcipher_request *req,
+				       struct skcipher_walk *walk,
+				       struct crypto_cipher *tfm)
+{
+	int bsize = crypto_cipher_blocksize(tfm);
+	unsigned int nbytes = walk->nbytes;
+	u8 *src = walk->src.virt.addr;
+	u8 * const iv = walk->iv;
+	u8 tmpbuf[MAX_CIPHER_BLOCKSIZE] __aligned(__alignof__(u32));
+
+	do {
+		memcpy(tmpbuf, src, bsize);
+		crypto_cipher_decrypt_one(tfm, src, src);
+		crypto_xor(src, iv, bsize);
+		crypto_xor_cpy(iv, src, tmpbuf, bsize);
+
+		src += bsize;
+	} while ((nbytes -= bsize) >= bsize);
+
+	return nbytes;
+}
+
+static int crypto_pcbc_decrypt(struct skcipher_request *req)
+{
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+	struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);
+	struct skcipher_walk walk;
+	unsigned int nbytes;
+	int err;
+
+	err = skcipher_walk_virt(&walk, req, false);
+
+	while ((nbytes = walk.nbytes)) {
+		if (walk.src.virt.addr == walk.dst.virt.addr)
+			nbytes = crypto_pcbc_decrypt_inplace(req, &walk,
+							     cipher);
+		else
+			nbytes = crypto_pcbc_decrypt_segment(req, &walk,
+							     cipher);
+		err = skcipher_walk_done(&walk, nbytes);
+	}
+
+	return err;
+}
+
+static int crypto_pcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
+{
+	struct skcipher_instance *inst;
+	int err;
+
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
+	if (IS_ERR(inst))
+		return PTR_ERR(inst);
+
+	inst->alg.encrypt = crypto_pcbc_encrypt;
+	inst->alg.decrypt = crypto_pcbc_decrypt;
+
+	err = skcipher_register_instance(tmpl, inst);
+	if (err)
+		inst->free(inst);
+
+	return err;
+}
+
+static struct crypto_template crypto_pcbc_tmpl = {
+	.name = "pcbc",
+	.create = crypto_pcbc_create,
+	.module = THIS_MODULE,
+};
+
+static int __init crypto_pcbc_module_init(void)
+{
+	return crypto_register_template(&crypto_pcbc_tmpl);
+}
+
+static void __exit crypto_pcbc_module_exit(void)
+{
+	crypto_unregister_template(&crypto_pcbc_tmpl);
+}
+
+subsys_initcall(crypto_pcbc_module_init);
+module_exit(crypto_pcbc_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("PCBC block cipher mode of operation");
+MODULE_ALIAS_CRYPTO("pcbc");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);