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 <linux/kernel.h> 13#include <linux/crypto.h> 14#include <linux/errno.h> 15#include <linux/slab.h> 16#include <linux/string.h> 17#include "internal.h" 18 19static int setkey_unaligned(struct crypto_cipher *tfm, const u8 *key, 20 unsigned int keylen) 21{ 22 struct cipher_alg *cia = crypto_cipher_alg(tfm); 23 unsigned long alignmask = crypto_cipher_alignmask(tfm); 24 int ret; 25 u8 *buffer, *alignbuffer; 26 unsigned long absize; 27 28 absize = keylen + alignmask; 29 buffer = kmalloc(absize, GFP_ATOMIC); 30 if (!buffer) 31 return -ENOMEM; 32 33 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); 34 memcpy(alignbuffer, key, keylen); 35 ret = cia->cia_setkey(crypto_cipher_tfm(tfm), alignbuffer, keylen); 36 kfree_sensitive(buffer); 37 return ret; 38 39} 40 41int crypto_cipher_setkey(struct crypto_cipher *tfm, 42 const u8 *key, unsigned int keylen) 43{ 44 struct cipher_alg *cia = crypto_cipher_alg(tfm); 45 unsigned long alignmask = crypto_cipher_alignmask(tfm); 46 47 if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize) 48 return -EINVAL; 49 50 if ((unsigned long)key & alignmask) 51 return setkey_unaligned(tfm, key, keylen); 52 53 return cia->cia_setkey(crypto_cipher_tfm(tfm), key, keylen); 54} 55EXPORT_SYMBOL_GPL(crypto_cipher_setkey); 56 57static inline void cipher_crypt_one(struct crypto_cipher *tfm, 58 u8 *dst, const u8 *src, bool enc) 59{ 60 unsigned long alignmask = crypto_cipher_alignmask(tfm); 61 struct cipher_alg *cia = crypto_cipher_alg(tfm); 62 void (*fn)(struct crypto_tfm *, u8 *, const u8 *) = 63 enc ? cia->cia_encrypt : cia->cia_decrypt; 64 65 if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) { 66 unsigned int bs = crypto_cipher_blocksize(tfm); 67 u8 buffer[MAX_CIPHER_BLOCKSIZE + MAX_CIPHER_ALIGNMASK]; 68 u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); 69 70 memcpy(tmp, src, bs); 71 fn(crypto_cipher_tfm(tfm), tmp, tmp); 72 memcpy(dst, tmp, bs); 73 } else { 74 fn(crypto_cipher_tfm(tfm), dst, src); 75 } 76} 77 78void crypto_cipher_encrypt_one(struct crypto_cipher *tfm, 79 u8 *dst, const u8 *src) 80{ 81 cipher_crypt_one(tfm, dst, src, true); 82} 83EXPORT_SYMBOL_GPL(crypto_cipher_encrypt_one); 84 85void crypto_cipher_decrypt_one(struct crypto_cipher *tfm, 86 u8 *dst, const u8 *src) 87{ 88 cipher_crypt_one(tfm, dst, src, false); 89} 90EXPORT_SYMBOL_GPL(crypto_cipher_decrypt_one); 91