cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cipher.c (2666B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Cryptographic API.
      4 *
      5 * Single-block cipher operations.
      6 *
      7 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
      8 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
      9 */
     10
     11#include <crypto/algapi.h>
     12#include <crypto/internal/cipher.h>
     13#include <linux/kernel.h>
     14#include <linux/crypto.h>
     15#include <linux/errno.h>
     16#include <linux/slab.h>
     17#include <linux/string.h>
     18#include "internal.h"
     19
     20static int setkey_unaligned(struct crypto_cipher *tfm, const u8 *key,
     21			    unsigned int keylen)
     22{
     23	struct cipher_alg *cia = crypto_cipher_alg(tfm);
     24	unsigned long alignmask = crypto_cipher_alignmask(tfm);
     25	int ret;
     26	u8 *buffer, *alignbuffer;
     27	unsigned long absize;
     28
     29	absize = keylen + alignmask;
     30	buffer = kmalloc(absize, GFP_ATOMIC);
     31	if (!buffer)
     32		return -ENOMEM;
     33
     34	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
     35	memcpy(alignbuffer, key, keylen);
     36	ret = cia->cia_setkey(crypto_cipher_tfm(tfm), alignbuffer, keylen);
     37	memset(alignbuffer, 0, keylen);
     38	kfree(buffer);
     39	return ret;
     40
     41}
     42
     43int crypto_cipher_setkey(struct crypto_cipher *tfm,
     44			 const u8 *key, unsigned int keylen)
     45{
     46	struct cipher_alg *cia = crypto_cipher_alg(tfm);
     47	unsigned long alignmask = crypto_cipher_alignmask(tfm);
     48
     49	if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize)
     50		return -EINVAL;
     51
     52	if ((unsigned long)key & alignmask)
     53		return setkey_unaligned(tfm, key, keylen);
     54
     55	return cia->cia_setkey(crypto_cipher_tfm(tfm), key, keylen);
     56}
     57EXPORT_SYMBOL_NS_GPL(crypto_cipher_setkey, CRYPTO_INTERNAL);
     58
     59static inline void cipher_crypt_one(struct crypto_cipher *tfm,
     60				    u8 *dst, const u8 *src, bool enc)
     61{
     62	unsigned long alignmask = crypto_cipher_alignmask(tfm);
     63	struct cipher_alg *cia = crypto_cipher_alg(tfm);
     64	void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
     65		enc ? cia->cia_encrypt : cia->cia_decrypt;
     66
     67	if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) {
     68		unsigned int bs = crypto_cipher_blocksize(tfm);
     69		u8 buffer[MAX_CIPHER_BLOCKSIZE + MAX_CIPHER_ALIGNMASK];
     70		u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
     71
     72		memcpy(tmp, src, bs);
     73		fn(crypto_cipher_tfm(tfm), tmp, tmp);
     74		memcpy(dst, tmp, bs);
     75	} else {
     76		fn(crypto_cipher_tfm(tfm), dst, src);
     77	}
     78}
     79
     80void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,
     81			       u8 *dst, const u8 *src)
     82{
     83	cipher_crypt_one(tfm, dst, src, true);
     84}
     85EXPORT_SYMBOL_NS_GPL(crypto_cipher_encrypt_one, CRYPTO_INTERNAL);
     86
     87void crypto_cipher_decrypt_one(struct crypto_cipher *tfm,
     88			       u8 *dst, const u8 *src)
     89{
     90	cipher_crypt_one(tfm, dst, src, false);
     91}
     92EXPORT_SYMBOL_NS_GPL(crypto_cipher_decrypt_one, CRYPTO_INTERNAL);