summaryrefslogtreecommitdiff
path: root/include/crypto/cbc.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/crypto/cbc.h')
-rw-r--r--include/crypto/cbc.h141
1 files changed, 0 insertions, 141 deletions
diff --git a/include/crypto/cbc.h b/include/crypto/cbc.h
deleted file mode 100644
index 2b6422db42e2..000000000000
--- a/include/crypto/cbc.h
+++ /dev/null
@@ -1,141 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * CBC: Cipher Block Chaining mode
- *
- * Copyright (c) 2016 Herbert Xu <herbert@gondor.apana.org.au>
- */
-
-#ifndef _CRYPTO_CBC_H
-#define _CRYPTO_CBC_H
-
-#include <crypto/internal/skcipher.h>
-#include <linux/string.h>
-#include <linux/types.h>
-
-static inline int crypto_cbc_encrypt_segment(
- struct skcipher_walk *walk, struct crypto_skcipher *tfm,
- void (*fn)(struct crypto_skcipher *, const u8 *, u8 *))
-{
- unsigned int bsize = crypto_skcipher_blocksize(tfm);
- unsigned int nbytes = walk->nbytes;
- u8 *src = walk->src.virt.addr;
- u8 *dst = walk->dst.virt.addr;
- u8 *iv = walk->iv;
-
- do {
- crypto_xor(iv, src, bsize);
- fn(tfm, iv, dst);
- memcpy(iv, dst, bsize);
-
- src += bsize;
- dst += bsize;
- } while ((nbytes -= bsize) >= bsize);
-
- return nbytes;
-}
-
-static inline int crypto_cbc_encrypt_inplace(
- struct skcipher_walk *walk, struct crypto_skcipher *tfm,
- void (*fn)(struct crypto_skcipher *, const u8 *, u8 *))
-{
- unsigned int bsize = crypto_skcipher_blocksize(tfm);
- unsigned int nbytes = walk->nbytes;
- u8 *src = walk->src.virt.addr;
- u8 *iv = walk->iv;
-
- do {
- crypto_xor(src, iv, bsize);
- fn(tfm, src, src);
- iv = src;
-
- src += bsize;
- } while ((nbytes -= bsize) >= bsize);
-
- memcpy(walk->iv, iv, bsize);
-
- return nbytes;
-}
-
-static inline int crypto_cbc_encrypt_walk(struct skcipher_request *req,
- void (*fn)(struct crypto_skcipher *,
- const u8 *, u8 *))
-{
- struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(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)
- err = crypto_cbc_encrypt_inplace(&walk, tfm, fn);
- else
- err = crypto_cbc_encrypt_segment(&walk, tfm, fn);
- err = skcipher_walk_done(&walk, err);
- }
-
- return err;
-}
-
-static inline int crypto_cbc_decrypt_segment(
- struct skcipher_walk *walk, struct crypto_skcipher *tfm,
- void (*fn)(struct crypto_skcipher *, const u8 *, u8 *))
-{
- unsigned int bsize = crypto_skcipher_blocksize(tfm);
- unsigned int nbytes = walk->nbytes;
- u8 *src = walk->src.virt.addr;
- u8 *dst = walk->dst.virt.addr;
- u8 *iv = walk->iv;
-
- do {
- fn(tfm, src, dst);
- crypto_xor(dst, iv, bsize);
- iv = src;
-
- src += bsize;
- dst += bsize;
- } while ((nbytes -= bsize) >= bsize);
-
- memcpy(walk->iv, iv, bsize);
-
- return nbytes;
-}
-
-static inline int crypto_cbc_decrypt_inplace(
- struct skcipher_walk *walk, struct crypto_skcipher *tfm,
- void (*fn)(struct crypto_skcipher *, const u8 *, u8 *))
-{
- unsigned int bsize = crypto_skcipher_blocksize(tfm);
- unsigned int nbytes = walk->nbytes;
- u8 *src = walk->src.virt.addr;
- u8 last_iv[MAX_CIPHER_BLOCKSIZE];
-
- /* Start of the last block. */
- src += nbytes - (nbytes & (bsize - 1)) - bsize;
- memcpy(last_iv, src, bsize);
-
- for (;;) {
- fn(tfm, src, src);
- 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);
-
- return nbytes;
-}
-
-static inline int crypto_cbc_decrypt_blocks(
- struct skcipher_walk *walk, struct crypto_skcipher *tfm,
- void (*fn)(struct crypto_skcipher *, const u8 *, u8 *))
-{
- if (walk->src.virt.addr == walk->dst.virt.addr)
- return crypto_cbc_decrypt_inplace(walk, tfm, fn);
- else
- return crypto_cbc_decrypt_segment(walk, tfm, fn);
-}
-
-#endif /* _CRYPTO_CBC_H */