1 files changed, 84 insertions, 188 deletions

diff --git a/crypto/cbc.c b/crypto/cbc.c
index 61ac42e1e32b..ed3df6246765 100644
--- a/crypto/cbc.c
+++ b/crypto/cbc.c
@@ -1,130 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * CBC: Cipher Block Chaining mode
  *
- * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.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.
- *
+ * Copyright (c) 2006-2016 Herbert Xu <herbert@gondor.apana.org.au>
  */
 
-#include <crypto/algapi.h>
+#include <crypto/internal/skcipher.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/log2.h>
 #include <linux/module.h>
-#include <linux/scatterlist.h>
-#include <linux/slab.h>
-
-struct crypto_cbc_ctx {
-	struct crypto_cipher *child;
-};
-
-static int crypto_cbc_setkey(struct crypto_tfm *parent, const u8 *key,
-			     unsigned int keylen)
-{
-	struct crypto_cbc_ctx *ctx = crypto_tfm_ctx(parent);
-	struct crypto_cipher *child = ctx->child;
-	int err;
-
-	crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
-	crypto_cipher_set_flags(child, crypto_tfm_get_flags(parent) &
-				       CRYPTO_TFM_REQ_MASK);
-	err = crypto_cipher_setkey(child, key, keylen);
-	crypto_tfm_set_flags(parent, crypto_cipher_get_flags(child) &
-				     CRYPTO_TFM_RES_MASK);
-	return err;
-}
 
-static int crypto_cbc_encrypt_segment(struct blkcipher_desc *desc,
-				      struct blkcipher_walk *walk,
-				      struct crypto_cipher *tfm)
+static int crypto_cbc_encrypt_segment(struct crypto_lskcipher *tfm,
+				      const u8 *src, u8 *dst, unsigned nbytes,
+				      u8 *iv)
 {
-	void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
-		crypto_cipher_alg(tfm)->cia_encrypt;
-	int bsize = crypto_cipher_blocksize(tfm);
-	unsigned int nbytes = walk->nbytes;
-	u8 *src = walk->src.virt.addr;
-	u8 *dst = walk->dst.virt.addr;
-	u8 *iv = walk->iv;
+	unsigned int bsize = crypto_lskcipher_blocksize(tfm);
 
-	do {
+	for (; nbytes >= bsize; src += bsize, dst += bsize, nbytes -= bsize) {
 		crypto_xor(iv, src, bsize);
-		fn(crypto_cipher_tfm(tfm), dst, iv);
+		crypto_lskcipher_encrypt(tfm, iv, dst, bsize, NULL);
 		memcpy(iv, dst, bsize);
-
-		src += bsize;
-		dst += bsize;
-	} while ((nbytes -= bsize) >= bsize);
+	}
 
 	return nbytes;
 }
 
-static int crypto_cbc_encrypt_inplace(struct blkcipher_desc *desc,
-				      struct blkcipher_walk *walk,
-				      struct crypto_cipher *tfm)
+static int crypto_cbc_encrypt_inplace(struct crypto_lskcipher *tfm,
+				      u8 *src, unsigned nbytes, u8 *oiv)
 {
-	void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
-		crypto_cipher_alg(tfm)->cia_encrypt;
-	int bsize = crypto_cipher_blocksize(tfm);
-	unsigned int nbytes = walk->nbytes;
-	u8 *src = walk->src.virt.addr;
-	u8 *iv = walk->iv;
+	unsigned int bsize = crypto_lskcipher_blocksize(tfm);
+	u8 *iv = oiv;
+
+	if (nbytes < bsize)
+		goto out;
 
 	do {
 		crypto_xor(src, iv, bsize);
-		fn(crypto_cipher_tfm(tfm), src, src);
+		crypto_lskcipher_encrypt(tfm, src, src, bsize, NULL);
 		iv = src;
 
 		src += bsize;
 	} while ((nbytes -= bsize) >= bsize);
 
-	memcpy(walk->iv, iv, bsize);
+	memcpy(oiv, iv, bsize);
 
+out:
 	return nbytes;
 }
 
-static int crypto_cbc_encrypt(struct blkcipher_desc *desc,
-			      struct scatterlist *dst, struct scatterlist *src,
-			      unsigned int nbytes)
+static int crypto_cbc_encrypt(struct crypto_lskcipher *tfm, const u8 *src,
+			      u8 *dst, unsigned len, u8 *iv, u32 flags)
 {
-	struct blkcipher_walk walk;
-	struct crypto_blkcipher *tfm = desc->tfm;
-	struct crypto_cbc_ctx *ctx = crypto_blkcipher_ctx(tfm);
-	struct crypto_cipher *child = ctx->child;
-	int err;
+	struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm);
+	bool final = flags & CRYPTO_LSKCIPHER_FLAG_FINAL;
+	struct crypto_lskcipher *cipher = *ctx;
+	int rem;
 
-	blkcipher_walk_init(&walk, dst, src, nbytes);
-	err = blkcipher_walk_virt(desc, &walk);
+	if (src == dst)
+		rem = crypto_cbc_encrypt_inplace(cipher, dst, len, iv);
+	else
+		rem = crypto_cbc_encrypt_segment(cipher, src, dst, len, iv);
 
-	while ((nbytes = walk.nbytes)) {
-		if (walk.src.virt.addr == walk.dst.virt.addr)
-			nbytes = crypto_cbc_encrypt_inplace(desc, &walk, child);
-		else
-			nbytes = crypto_cbc_encrypt_segment(desc, &walk, child);
-		err = blkcipher_walk_done(desc, &walk, nbytes);
-	}
-
-	return err;
+	return rem && final ? -EINVAL : rem;
 }
 
-static int crypto_cbc_decrypt_segment(struct blkcipher_desc *desc,
-				      struct blkcipher_walk *walk,
-				      struct crypto_cipher *tfm)
+static int crypto_cbc_decrypt_segment(struct crypto_lskcipher *tfm,
+				      const u8 *src, u8 *dst, unsigned nbytes,
+				      u8 *oiv)
 {
-	void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
-		crypto_cipher_alg(tfm)->cia_decrypt;
-	int bsize = crypto_cipher_blocksize(tfm);
-	unsigned int nbytes = walk->nbytes;
-	u8 *src = walk->src.virt.addr;
-	u8 *dst = walk->dst.virt.addr;
-	u8 *iv = walk->iv;
+	unsigned int bsize = crypto_lskcipher_blocksize(tfm);
+	const u8 *iv = oiv;
+
+	if (nbytes < bsize)
+		goto out;
 
 	do {
-		fn(crypto_cipher_tfm(tfm), dst, src);
+		crypto_lskcipher_decrypt(tfm, src, dst, bsize, NULL);
 		crypto_xor(dst, iv, bsize);
 		iv = src;
 
@@ -132,145 +85,87 @@ static int crypto_cbc_decrypt_segment(struct blkcipher_desc *desc,
 		dst += bsize;
 	} while ((nbytes -= bsize) >= bsize);
 
-	memcpy(walk->iv, iv, bsize);
+	memcpy(oiv, iv, bsize);
 
+out:
 	return nbytes;
 }
 
-static int crypto_cbc_decrypt_inplace(struct blkcipher_desc *desc,
-				      struct blkcipher_walk *walk,
-				      struct crypto_cipher *tfm)
+static int crypto_cbc_decrypt_inplace(struct crypto_lskcipher *tfm,
+				      u8 *src, unsigned nbytes, u8 *iv)
 {
-	void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
-		crypto_cipher_alg(tfm)->cia_decrypt;
-	int bsize = crypto_cipher_blocksize(tfm);
-	unsigned int nbytes = walk->nbytes;
-	u8 *src = walk->src.virt.addr;
-	u8 last_iv[bsize];
+	unsigned int bsize = crypto_lskcipher_blocksize(tfm);
+	u8 last_iv[MAX_CIPHER_BLOCKSIZE];
+
+	if (nbytes < bsize)
+		goto out;
 
 	/* Start of the last block. */
 	src += nbytes - (nbytes & (bsize - 1)) - bsize;
 	memcpy(last_iv, src, bsize);
 
 	for (;;) {
-		fn(crypto_cipher_tfm(tfm), src, src);
+		crypto_lskcipher_decrypt(tfm, src, src, bsize, NULL);
 		if ((nbytes -= bsize) < bsize)
 			break;
 		crypto_xor(src, src - bsize, bsize);
 		src -= bsize;
 	}
 
-	crypto_xor(src, walk->iv, bsize);
-	memcpy(walk->iv, last_iv, bsize);
+	crypto_xor(src, iv, bsize);
+	memcpy(iv, last_iv, bsize);
 
+out:
 	return nbytes;
 }
 
-static int crypto_cbc_decrypt(struct blkcipher_desc *desc,
-			      struct scatterlist *dst, struct scatterlist *src,
-			      unsigned int nbytes)
+static int crypto_cbc_decrypt(struct crypto_lskcipher *tfm, const u8 *src,
+			      u8 *dst, unsigned len, u8 *iv, u32 flags)
 {
-	struct blkcipher_walk walk;
-	struct crypto_blkcipher *tfm = desc->tfm;
-	struct crypto_cbc_ctx *ctx = crypto_blkcipher_ctx(tfm);
-	struct crypto_cipher *child = ctx->child;
-	int err;
-
-	blkcipher_walk_init(&walk, dst, src, nbytes);
-	err = blkcipher_walk_virt(desc, &walk);
-
-	while ((nbytes = walk.nbytes)) {
-		if (walk.src.virt.addr == walk.dst.virt.addr)
-			nbytes = crypto_cbc_decrypt_inplace(desc, &walk, child);
-		else
-			nbytes = crypto_cbc_decrypt_segment(desc, &walk, child);
-		err = blkcipher_walk_done(desc, &walk, nbytes);
-	}
+	struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm);
+	bool final = flags & CRYPTO_LSKCIPHER_FLAG_FINAL;
+	struct crypto_lskcipher *cipher = *ctx;
+	int rem;
 
-	return err;
-}
-
-static int crypto_cbc_init_tfm(struct crypto_tfm *tfm)
-{
-	struct crypto_instance *inst = (void *)tfm->__crt_alg;
-	struct crypto_spawn *spawn = crypto_instance_ctx(inst);
-	struct crypto_cbc_ctx *ctx = crypto_tfm_ctx(tfm);
-	struct crypto_cipher *cipher;
-
-	cipher = crypto_spawn_cipher(spawn);
-	if (IS_ERR(cipher))
-		return PTR_ERR(cipher);
-
-	ctx->child = cipher;
-	return 0;
-}
+	if (src == dst)
+		rem = crypto_cbc_decrypt_inplace(cipher, dst, len, iv);
+	else
+		rem = crypto_cbc_decrypt_segment(cipher, src, dst, len, iv);
 
-static void crypto_cbc_exit_tfm(struct crypto_tfm *tfm)
-{
-	struct crypto_cbc_ctx *ctx = crypto_tfm_ctx(tfm);
-	crypto_free_cipher(ctx->child);
+	return rem && final ? -EINVAL : rem;
 }
 
-static struct crypto_instance *crypto_cbc_alloc(struct rtattr **tb)
+static int crypto_cbc_create(struct crypto_template *tmpl, struct rtattr **tb)
 {
-	struct crypto_instance *inst;
-	struct crypto_alg *alg;
+	struct lskcipher_instance *inst;
 	int err;
 
-	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
-	if (err)
-		return ERR_PTR(err);
-
-	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
-				  CRYPTO_ALG_TYPE_MASK);
-	if (IS_ERR(alg))
-		return ERR_CAST(alg);
-
-	inst = ERR_PTR(-EINVAL);
-	if (!is_power_of_2(alg->cra_blocksize))
-		goto out_put_alg;
-
-	inst = crypto_alloc_instance("cbc", alg);
+	inst = lskcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
-		goto out_put_alg;
-
-	inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
-	inst->alg.cra_priority = alg->cra_priority;
-	inst->alg.cra_blocksize = alg->cra_blocksize;
-	inst->alg.cra_alignmask = alg->cra_alignmask;
-	inst->alg.cra_type = &crypto_blkcipher_type;
-
-	/* We access the data as u32s when xoring. */
-	inst->alg.cra_alignmask |= __alignof__(u32) - 1;
+		return PTR_ERR(inst);
 
-	inst->alg.cra_blkcipher.ivsize = alg->cra_blocksize;
-	inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
-	inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
+	err = -EINVAL;
+	if (!is_power_of_2(inst->alg.co.base.cra_blocksize))
+		goto out_free_inst;
 
-	inst->alg.cra_ctxsize = sizeof(struct crypto_cbc_ctx);
+	if (inst->alg.co.statesize)
+		goto out_free_inst;
 
-	inst->alg.cra_init = crypto_cbc_init_tfm;
-	inst->alg.cra_exit = crypto_cbc_exit_tfm;
+	inst->alg.encrypt = crypto_cbc_encrypt;
+	inst->alg.decrypt = crypto_cbc_decrypt;
 
-	inst->alg.cra_blkcipher.setkey = crypto_cbc_setkey;
-	inst->alg.cra_blkcipher.encrypt = crypto_cbc_encrypt;
-	inst->alg.cra_blkcipher.decrypt = crypto_cbc_decrypt;
-
-out_put_alg:
-	crypto_mod_put(alg);
-	return inst;
-}
+	err = lskcipher_register_instance(tmpl, inst);
+	if (err) {
+out_free_inst:
+		inst->free(inst);
+	}
 
-static void crypto_cbc_free(struct crypto_instance *inst)
-{
-	crypto_drop_spawn(crypto_instance_ctx(inst));
-	kfree(inst);
+	return err;
 }
 
 static struct crypto_template crypto_cbc_tmpl = {
 	.name = "cbc",
-	.alloc = crypto_cbc_alloc,
-	.free = crypto_cbc_free,
+	.create = crypto_cbc_create,
 	.module = THIS_MODULE,
 };
 
@@ -288,4 +183,5 @@ module_init(crypto_cbc_module_init);
 module_exit(crypto_cbc_module_exit);
 
 MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("CBC block cipher algorithm");
+MODULE_DESCRIPTION("CBC block cipher mode of operation");
+MODULE_ALIAS_CRYPTO("cbc");