Gecko [ oric.aiou.edu.pk ]

Name	Size	Permission
internal	[ DIR ]	drwxr-xr-x
acompress.h	8.01 KB	-rw-r--r--
aead.h	17.58 KB	-rw-r--r--
aes.h	2.5 KB	-rw-r--r--
akcipher.h	12.91 KB	-rw-r--r--
algapi.h	11.12 KB	-rw-r--r--
arc4.h	484 B	-rw-r--r--
asym_tpm_subtype.h	521 B	-rw-r--r--
authenc.h	635 B	-rw-r--r--
b128ops.h	2.41 KB	-rw-r--r--
blake2s.h	2.37 KB	-rw-r--r--
blowfish.h	415 B	-rw-r--r--
cast5.h	590 B	-rw-r--r--
cast6.h	624 B	-rw-r--r--
cast_common.h	232 B	-rw-r--r--
cbc.h	3.29 KB	-rw-r--r--
chacha.h	2.08 KB	-rw-r--r--
cryptd.h	2 KB	-rw-r--r--
ctr.h	1.42 KB	-rw-r--r--
des.h	1.68 KB	-rw-r--r--
dh.h	2.51 KB	-rw-r--r--
drbg.h	8.99 KB	-rw-r--r--
ecdh.h	2.46 KB	-rw-r--r--
engine.h	3.9 KB	-rw-r--r--
gcm.h	867 B	-rw-r--r--
gf128mul.h	9.41 KB	-rw-r--r--
ghash.h	388 B	-rw-r--r--
hash.h	32.09 KB	-rw-r--r--
hash_info.h	972 B	-rw-r--r--
hmac.h	173 B	-rw-r--r--
if_alg.h	6.59 KB	-rw-r--r--
kpp.h	9.9 KB	-rw-r--r--
md5.h	497 B	-rw-r--r--
nhpoly1305.h	2.17 KB	-rw-r--r--
null.h	346 B	-rw-r--r--
padlock.h	438 B	-rw-r--r--
pcrypt.h	815 B	-rw-r--r--
pkcs7.h	1.15 KB	-rw-r--r--
poly1305.h	1.72 KB	-rw-r--r--
public_key.h	2.34 KB	-rw-r--r--
rng.h	6.59 KB	-rw-r--r--
scatterwalk.h	3.14 KB	-rw-r--r--
serpent.h	696 B	-rw-r--r--
sha.h	4.32 KB	-rw-r--r--
sha1_base.h	2.42 KB	-rw-r--r--
sha256_base.h	2.52 KB	-rw-r--r--
sha3.h	879 B	-rw-r--r--
sha512_base.h	3.15 KB	-rw-r--r--
skcipher.h	20.98 KB	-rw-r--r--
sm3.h	833 B	-rw-r--r--
sm3_base.h	2.51 KB	-rw-r--r--
sm4.h	754 B	-rw-r--r--
streebog.h	949 B	-rw-r--r--
twofish.h	755 B	-rw-r--r--
xts.h	1.35 KB	-rw-r--r--

Code Editor : cbc.h

/* 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 */

${this.title}

Code Editor : cbc.h