0eb76ba29d
The cipher routines in the crypto API are mostly intended for templates implementing skcipher modes generically in software, and shouldn't be used outside of the crypto subsystem. So move the prototypes and all related definitions to a new header file under include/crypto/internal. Also, let's use the new module namespace feature to move the symbol exports into a new namespace CRYPTO_INTERNAL. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Cryptographic API.
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*
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* Single-block cipher operations.
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*
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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* Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
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*/
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#include <crypto/algapi.h>
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#include <crypto/internal/cipher.h>
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#include <linux/kernel.h>
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#include <linux/crypto.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include "internal.h"
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static int setkey_unaligned(struct crypto_cipher *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct cipher_alg *cia = crypto_cipher_alg(tfm);
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unsigned long alignmask = crypto_cipher_alignmask(tfm);
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int ret;
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u8 *buffer, *alignbuffer;
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unsigned long absize;
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absize = keylen + alignmask;
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buffer = kmalloc(absize, GFP_ATOMIC);
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if (!buffer)
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return -ENOMEM;
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alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
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memcpy(alignbuffer, key, keylen);
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ret = cia->cia_setkey(crypto_cipher_tfm(tfm), alignbuffer, keylen);
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memset(alignbuffer, 0, keylen);
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kfree(buffer);
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return ret;
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}
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int crypto_cipher_setkey(struct crypto_cipher *tfm,
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const u8 *key, unsigned int keylen)
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{
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struct cipher_alg *cia = crypto_cipher_alg(tfm);
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unsigned long alignmask = crypto_cipher_alignmask(tfm);
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if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize)
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return -EINVAL;
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if ((unsigned long)key & alignmask)
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return setkey_unaligned(tfm, key, keylen);
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return cia->cia_setkey(crypto_cipher_tfm(tfm), key, keylen);
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}
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EXPORT_SYMBOL_NS_GPL(crypto_cipher_setkey, CRYPTO_INTERNAL);
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static inline void cipher_crypt_one(struct crypto_cipher *tfm,
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u8 *dst, const u8 *src, bool enc)
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{
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unsigned long alignmask = crypto_cipher_alignmask(tfm);
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struct cipher_alg *cia = crypto_cipher_alg(tfm);
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void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
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enc ? cia->cia_encrypt : cia->cia_decrypt;
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if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) {
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unsigned int bs = crypto_cipher_blocksize(tfm);
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u8 buffer[MAX_CIPHER_BLOCKSIZE + MAX_CIPHER_ALIGNMASK];
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u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
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memcpy(tmp, src, bs);
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fn(crypto_cipher_tfm(tfm), tmp, tmp);
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memcpy(dst, tmp, bs);
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} else {
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fn(crypto_cipher_tfm(tfm), dst, src);
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}
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}
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void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,
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u8 *dst, const u8 *src)
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{
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cipher_crypt_one(tfm, dst, src, true);
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}
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EXPORT_SYMBOL_NS_GPL(crypto_cipher_encrypt_one, CRYPTO_INTERNAL);
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void crypto_cipher_decrypt_one(struct crypto_cipher *tfm,
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u8 *dst, const u8 *src)
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{
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cipher_crypt_one(tfm, dst, src, false);
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}
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EXPORT_SYMBOL_NS_GPL(crypto_cipher_decrypt_one, CRYPTO_INTERNAL);
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