crypto: cipher - remove crt_u.cipher (struct cipher_tfm)
Of the three fields in crt_u.cipher (struct cipher_tfm), ->cit_setkey() is pointless because it always points to setkey() in crypto/cipher.c. ->cit_decrypt_one() and ->cit_encrypt_one() are slightly less pointless, since if the algorithm doesn't have an alignmask, they are set directly to ->cia_encrypt() and ->cia_decrypt(). However, this "optimization" isn't worthwhile because: - The "cipher" algorithm type is the only algorithm still using crt_u, so it's bloating every struct crypto_tfm for every algorithm type. - If the algorithm has an alignmask, this "optimization" actually makes things slower, as it causes 2 indirect calls per block rather than 1. - It adds extra code complexity. - Some templates already call ->cia_encrypt()/->cia_decrypt() directly instead of going through ->cit_encrypt_one()/->cit_decrypt_one(). - The "cipher" algorithm type never gives optimal performance anyway. For that, a higher-level type such as skcipher needs to be used. Therefore, just remove the extra indirection, and make crypto_cipher_setkey(), crypto_cipher_encrypt_one(), and crypto_cipher_decrypt_one() be direct calls into crypto/cipher.c. Also remove the unused function crypto_cipher_cast(). Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers
Herbert Xu
parent
c441a909c6
commit
e8cfed5e4e
13
crypto/api.c
13
crypto/api.c
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@ -295,20 +295,7 @@ static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
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if (type_obj)
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return type_obj->init(tfm, type, mask);
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switch (crypto_tfm_alg_type(tfm)) {
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case CRYPTO_ALG_TYPE_CIPHER:
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return crypto_init_cipher_ops(tfm);
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case CRYPTO_ALG_TYPE_COMPRESS:
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return 0;
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default:
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break;
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}
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BUG();
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return -EINVAL;
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}
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static void crypto_exit_ops(struct crypto_tfm *tfm)
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@ -2,7 +2,7 @@
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/*
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* Cryptographic API.
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*
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* Cipher operations.
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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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@ -16,11 +16,11 @@
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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_tfm *tfm, const u8 *key,
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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 = &tfm->__crt_alg->cra_cipher;
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unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
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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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@ -32,83 +32,63 @@ static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key,
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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(tfm, alignbuffer, 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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static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
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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 = &tfm->__crt_alg->cra_cipher;
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unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
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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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tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
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crypto_cipher_clear_flags(tfm, CRYPTO_TFM_RES_MASK);
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if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize) {
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tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
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crypto_cipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
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return -EINVAL;
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}
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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(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_GPL(crypto_cipher_setkey);
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static void cipher_crypt_unaligned(void (*fn)(struct crypto_tfm *, u8 *,
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const u8 *),
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struct crypto_tfm *tfm,
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u8 *dst, const u8 *src)
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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_tfm_alg_alignmask(tfm);
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unsigned int size = crypto_tfm_alg_blocksize(tfm);
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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, size);
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fn(tfm, tmp, tmp);
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memcpy(dst, tmp, size);
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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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static void cipher_encrypt_unaligned(struct crypto_tfm *tfm,
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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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unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
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struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher;
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if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) {
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cipher_crypt_unaligned(cipher->cia_encrypt, tfm, dst, src);
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return;
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cipher_crypt_one(tfm, dst, src, true);
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}
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EXPORT_SYMBOL_GPL(crypto_cipher_encrypt_one);
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cipher->cia_encrypt(tfm, dst, src);
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}
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static void cipher_decrypt_unaligned(struct crypto_tfm *tfm,
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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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unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
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struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher;
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if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) {
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cipher_crypt_unaligned(cipher->cia_decrypt, tfm, dst, src);
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return;
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}
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cipher->cia_decrypt(tfm, dst, src);
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}
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int crypto_init_cipher_ops(struct crypto_tfm *tfm)
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{
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struct cipher_tfm *ops = &tfm->crt_cipher;
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struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher;
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ops->cit_setkey = setkey;
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ops->cit_encrypt_one = crypto_tfm_alg_alignmask(tfm) ?
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cipher_encrypt_unaligned : cipher->cia_encrypt;
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ops->cit_decrypt_one = crypto_tfm_alg_alignmask(tfm) ?
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cipher_decrypt_unaligned : cipher->cia_decrypt;
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return 0;
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cipher_crypt_one(tfm, dst, src, false);
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}
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EXPORT_SYMBOL_GPL(crypto_cipher_decrypt_one);
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@ -58,8 +58,6 @@ static inline unsigned int crypto_compress_ctxsize(struct crypto_alg *alg)
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struct crypto_alg *crypto_mod_get(struct crypto_alg *alg);
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struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask);
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int crypto_init_cipher_ops(struct crypto_tfm *tfm);
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struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask);
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void crypto_larval_kill(struct crypto_alg *alg);
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void crypto_alg_tested(const char *name, int err);
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@ -599,23 +599,10 @@ int crypto_has_alg(const char *name, u32 type, u32 mask);
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* crypto_free_*(), as well as the various helpers below.
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*/
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struct cipher_tfm {
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int (*cit_setkey)(struct crypto_tfm *tfm,
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const u8 *key, unsigned int keylen);
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void (*cit_encrypt_one)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
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void (*cit_decrypt_one)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
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};
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#define crt_cipher crt_u.cipher
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struct crypto_tfm {
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u32 crt_flags;
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union {
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struct cipher_tfm cipher;
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} crt_u;
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void (*exit)(struct crypto_tfm *tfm);
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struct crypto_alg *__crt_alg;
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@ -752,12 +739,6 @@ static inline struct crypto_cipher *__crypto_cipher_cast(struct crypto_tfm *tfm)
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return (struct crypto_cipher *)tfm;
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}
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static inline struct crypto_cipher *crypto_cipher_cast(struct crypto_tfm *tfm)
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{
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BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
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return __crypto_cipher_cast(tfm);
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}
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/**
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* crypto_alloc_cipher() - allocate single block cipher handle
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* @alg_name: is the cra_name / name or cra_driver_name / driver name of the
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@ -815,11 +796,6 @@ static inline int crypto_has_cipher(const char *alg_name, u32 type, u32 mask)
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return crypto_has_alg(alg_name, type, mask);
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}
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static inline struct cipher_tfm *crypto_cipher_crt(struct crypto_cipher *tfm)
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{
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return &crypto_cipher_tfm(tfm)->crt_cipher;
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}
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/**
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* crypto_cipher_blocksize() - obtain block size for cipher
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* @tfm: cipher handle
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@ -873,12 +849,8 @@ static inline void crypto_cipher_clear_flags(struct crypto_cipher *tfm,
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*
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* Return: 0 if the setting of the key was successful; < 0 if an error occurred
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*/
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static inline 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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return crypto_cipher_crt(tfm)->cit_setkey(crypto_cipher_tfm(tfm),
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key, keylen);
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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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* crypto_cipher_encrypt_one() - encrypt one block of plaintext
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@ -889,12 +861,8 @@ static inline int crypto_cipher_setkey(struct crypto_cipher *tfm,
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* Invoke the encryption operation of one block. The caller must ensure that
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* the plaintext and ciphertext buffers are at least one block in size.
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*/
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static inline 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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crypto_cipher_crt(tfm)->cit_encrypt_one(crypto_cipher_tfm(tfm),
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dst, src);
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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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* crypto_cipher_decrypt_one() - decrypt one block of ciphertext
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@ -905,12 +873,8 @@ static inline void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,
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* Invoke the decryption operation of one block. The caller must ensure that
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* the plaintext and ciphertext buffers are at least one block in size.
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*/
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static inline 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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crypto_cipher_crt(tfm)->cit_decrypt_one(crypto_cipher_tfm(tfm),
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dst, src);
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}
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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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static inline struct crypto_comp *__crypto_comp_cast(struct crypto_tfm *tfm)
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{
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