// SPDX-License-Identifier: GPL-2.0-or-later/* * Cryptographic API. * * Single-block cipher operations. * * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au> */ #include <crypto/algapi.h>#include <crypto/internal/cipher.h>#include <linux/kernel.h>#include <linux/crypto.h>#include <linux/errno.h>#include <linux/slab.h>#include <linux/string.h>#include "internal.h" static int setkey_unaligned(struct crypto_cipher *tfm, const u8 *key,			    unsigned int keylen){	struct cipher_alg *cia = crypto_cipher_alg(tfm);	unsigned long alignmask = crypto_cipher_alignmask(tfm);	int ret;	u8 *buffer, *alignbuffer;	unsigned long absize; 	absize = keylen + alignmask;	buffer = kmalloc(absize, GFP_ATOMIC);	if (!buffer)		return -ENOMEM; 	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);	memcpy(alignbuffer, key, keylen);	ret = cia->cia_setkey(crypto_cipher_tfm(tfm), alignbuffer, keylen);	kfree_sensitive(buffer);	return ret; } int crypto_cipher_setkey(struct crypto_cipher *tfm,			 const u8 *key, unsigned int keylen){	struct cipher_alg *cia = crypto_cipher_alg(tfm);	unsigned long alignmask = crypto_cipher_alignmask(tfm); 	if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize)		return -EINVAL; 	if ((unsigned long)key & alignmask)		return setkey_unaligned(tfm, key, keylen); 	return cia->cia_setkey(crypto_cipher_tfm(tfm), key, keylen);}EXPORT_SYMBOL_NS_GPL(crypto_cipher_setkey, "CRYPTO_INTERNAL"); static inline void cipher_crypt_one(struct crypto_cipher *tfm,				    u8 *dst, const u8 *src, bool enc){	unsigned long alignmask = crypto_cipher_alignmask(tfm);	struct cipher_alg *cia = crypto_cipher_alg(tfm);	void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =		enc ? cia->cia_encrypt : cia->cia_decrypt; 	if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) {		unsigned int bs = crypto_cipher_blocksize(tfm);		u8 buffer[MAX_CIPHER_BLOCKSIZE + MAX_CIPHER_ALIGNMASK];		u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); 		memcpy(tmp, src, bs);		fn(crypto_cipher_tfm(tfm), tmp, tmp);		memcpy(dst, tmp, bs);	} else {		fn(crypto_cipher_tfm(tfm), dst, src);	}} void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,			       u8 *dst, const u8 *src){	cipher_crypt_one(tfm, dst, src, true);}EXPORT_SYMBOL_NS_GPL(crypto_cipher_encrypt_one, "CRYPTO_INTERNAL"); void crypto_cipher_decrypt_one(struct crypto_cipher *tfm,			       u8 *dst, const u8 *src){	cipher_crypt_one(tfm, dst, src, false);}EXPORT_SYMBOL_NS_GPL(crypto_cipher_decrypt_one, "CRYPTO_INTERNAL"); struct crypto_cipher *crypto_clone_cipher(struct crypto_cipher *cipher){	struct crypto_tfm *tfm = crypto_cipher_tfm(cipher);	struct crypto_alg *alg = tfm->__crt_alg;	struct crypto_cipher *ncipher;	struct crypto_tfm *ntfm; 	if (alg->cra_init)		return ERR_PTR(-ENOSYS); 	if (unlikely(!crypto_mod_get(alg)))		return ERR_PTR(-ESTALE); 	ntfm = __crypto_alloc_tfmgfp(alg, CRYPTO_ALG_TYPE_CIPHER,				     CRYPTO_ALG_TYPE_MASK, GFP_ATOMIC);	if (IS_ERR(ntfm)) {		crypto_mod_put(alg);		return ERR_CAST(ntfm);	} 	ntfm->crt_flags = tfm->crt_flags; 	ncipher = __crypto_cipher_cast(ntfm); 	return ncipher;}EXPORT_SYMBOL_GPL(crypto_clone_cipher);