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- /*
- * Cryptographic API.
- *
- * Cipher operations.
- *
- * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
- * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- */
- #include <linux/kernel.h>
- #include <linux/crypto.h>
- #include <linux/errno.h>
- #include <linux/scatterlist.h>
- #include <linux/string.h>
- #include "internal.h"
- static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
- {
- struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher;
-
- tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
- if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize) {
- tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
- return -EINVAL;
- } else
- return cia->cia_setkey(tfm, key, keylen);
- }
- static void cipher_crypt_unaligned(void (*fn)(struct crypto_tfm *, u8 *,
- const u8 *),
- struct crypto_tfm *tfm,
- u8 *dst, const u8 *src)
- {
- unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
- unsigned int size = crypto_tfm_alg_blocksize(tfm);
- u8 buffer[size + alignmask];
- u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
- memcpy(tmp, src, size);
- fn(tfm, tmp, tmp);
- memcpy(dst, tmp, size);
- }
- static void cipher_encrypt_unaligned(struct crypto_tfm *tfm,
- u8 *dst, const u8 *src)
- {
- unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
- struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher;
- if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) {
- cipher_crypt_unaligned(cipher->cia_encrypt, tfm, dst, src);
- return;
- }
- cipher->cia_encrypt(tfm, dst, src);
- }
- static void cipher_decrypt_unaligned(struct crypto_tfm *tfm,
- u8 *dst, const u8 *src)
- {
- unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
- struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher;
- if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) {
- cipher_crypt_unaligned(cipher->cia_decrypt, tfm, dst, src);
- return;
- }
- cipher->cia_decrypt(tfm, dst, src);
- }
- int crypto_init_cipher_ops(struct crypto_tfm *tfm)
- {
- struct cipher_tfm *ops = &tfm->crt_cipher;
- struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher;
- ops->cit_setkey = setkey;
- ops->cit_encrypt_one = crypto_tfm_alg_alignmask(tfm) ?
- cipher_encrypt_unaligned : cipher->cia_encrypt;
- ops->cit_decrypt_one = crypto_tfm_alg_alignmask(tfm) ?
- cipher_decrypt_unaligned : cipher->cia_decrypt;
- return 0;
- }
- void crypto_exit_cipher_ops(struct crypto_tfm *tfm)
- {
- }
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