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author | Herbert Xu <herbert@gondor.apana.org.au> | 2020-09-01 14:49:11 +0300 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2020-09-11 07:39:16 +0300 |
commit | 5f254dd440fbad0c00632f9ac7645f07d8df9229 (patch) | |
tree | 6b87c8d527dfe2015d1eeeda94db86c9e44a2fea /include/crypto | |
parent | 00b99ad2bac256e3e4f10214c77fce6603afca26 (diff) | |
download | linux-5f254dd440fbad0c00632f9ac7645f07d8df9229.tar.xz |
crypto: cbc - Remove cbc.h
Now that crypto/cbc.h is only used by the generic cbc template,
we can merge it back into the CBC code.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/crypto')
-rw-r--r-- | include/crypto/cbc.h | 141 |
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 */ |