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authorEric Biggers <ebiggers@google.com>2019-12-02 13:42:30 -0800
committerHerbert Xu <herbert@gondor.apana.org.au>2019-12-11 16:37:01 +0800
commite8cfed5e4e2b5929371955f476a52a4c3398ead3 (patch)
treef93f5572c6de017f5fafd6f6c7ee6c3f0fda8761
parentc441a909c68618ff64aa70394d0b270b0665a229 (diff)
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>
-rw-r--r--crypto/api.c15
-rw-r--r--crypto/cipher.c92
-rw-r--r--crypto/internal.h2
-rw-r--r--include/linux/crypto.h48
4 files changed, 43 insertions, 114 deletions
diff --git a/crypto/api.c b/crypto/api.c
index 268129979bc2..ef96142ceca7 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -295,20 +295,7 @@ static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
if (type_obj)
return type_obj->init(tfm, type, mask);
-
- switch (crypto_tfm_alg_type(tfm)) {
- case CRYPTO_ALG_TYPE_CIPHER:
- return crypto_init_cipher_ops(tfm);
-
- case CRYPTO_ALG_TYPE_COMPRESS:
- return 0;
-
- default:
- break;
- }
-
- BUG();
- return -EINVAL;
+ return 0;
}
static void crypto_exit_ops(struct crypto_tfm *tfm)
diff --git a/crypto/cipher.c b/crypto/cipher.c
index 108427026e7c..aadd51cb7250 100644
--- a/crypto/cipher.c
+++ b/crypto/cipher.c
@@ -2,7 +2,7 @@
/*
* Cryptographic API.
*
- * Cipher operations.
+ * Single-block cipher operations.
*
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
* Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
@@ -16,11 +16,11 @@
#include <linux/string.h>
#include "internal.h"
-static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key,
+static int setkey_unaligned(struct crypto_cipher *tfm, const u8 *key,
unsigned int keylen)
{
- struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher;
- unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
+ struct cipher_alg *cia = crypto_cipher_alg(tfm);
+ unsigned long alignmask = crypto_cipher_alignmask(tfm);
int ret;
u8 *buffer, *alignbuffer;
unsigned long absize;
@@ -32,83 +32,63 @@ static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key,
alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
memcpy(alignbuffer, key, keylen);
- ret = cia->cia_setkey(tfm, alignbuffer, keylen);
+ ret = cia->cia_setkey(crypto_cipher_tfm(tfm), alignbuffer, keylen);
memset(alignbuffer, 0, keylen);
kfree(buffer);
return ret;
}
-static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
+int crypto_cipher_setkey(struct crypto_cipher *tfm,
+ const u8 *key, unsigned int keylen)
{
- struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher;
- unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
+ struct cipher_alg *cia = crypto_cipher_alg(tfm);
+ unsigned long alignmask = crypto_cipher_alignmask(tfm);
- tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
+ crypto_cipher_clear_flags(tfm, CRYPTO_TFM_RES_MASK);
if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize) {
- tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
+ crypto_cipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
if ((unsigned long)key & alignmask)
return setkey_unaligned(tfm, key, keylen);
- return cia->cia_setkey(tfm, key, keylen);
+ return cia->cia_setkey(crypto_cipher_tfm(tfm), key, keylen);
}
+EXPORT_SYMBOL_GPL(crypto_cipher_setkey);
-static void cipher_crypt_unaligned(void (*fn)(struct crypto_tfm *, u8 *,
- const u8 *),
- struct crypto_tfm *tfm,
- u8 *dst, const u8 *src)
+static inline void cipher_crypt_one(struct crypto_cipher *tfm,
+ u8 *dst, const u8 *src, bool enc)
{
- unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
- unsigned int size = crypto_tfm_alg_blocksize(tfm);
- u8 buffer[MAX_CIPHER_BLOCKSIZE + MAX_CIPHER_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;
+ 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)) {
- cipher_crypt_unaligned(cipher->cia_encrypt, tfm, dst, src);
- return;
+ 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);
}
-
- cipher->cia_encrypt(tfm, dst, src);
}
-static void cipher_decrypt_unaligned(struct crypto_tfm *tfm,
- u8 *dst, const u8 *src)
+void crypto_cipher_encrypt_one(struct crypto_cipher *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);
+ cipher_crypt_one(tfm, dst, src, true);
}
+EXPORT_SYMBOL_GPL(crypto_cipher_encrypt_one);
-int crypto_init_cipher_ops(struct crypto_tfm *tfm)
+void crypto_cipher_decrypt_one(struct crypto_cipher *tfm,
+ u8 *dst, const u8 *src)
{
- 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;
+ cipher_crypt_one(tfm, dst, src, false);
}
+EXPORT_SYMBOL_GPL(crypto_cipher_decrypt_one);
diff --git a/crypto/internal.h b/crypto/internal.h
index a58a2af4b669..ff06a3bd1ca1 100644
--- a/crypto/internal.h
+++ b/crypto/internal.h
@@ -58,8 +58,6 @@ static inline unsigned int crypto_compress_ctxsize(struct crypto_alg *alg)
struct crypto_alg *crypto_mod_get(struct crypto_alg *alg);
struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask);
-int crypto_init_cipher_ops(struct crypto_tfm *tfm);
-
struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask);
void crypto_larval_kill(struct crypto_alg *alg);
void crypto_alg_tested(const char *name, int err);
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 8f708564b98b..c23f1eed7970 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -599,23 +599,10 @@ int crypto_has_alg(const char *name, u32 type, u32 mask);
* crypto_free_*(), as well as the various helpers below.
*/
-struct cipher_tfm {
- int (*cit_setkey)(struct crypto_tfm *tfm,
- const u8 *key, unsigned int keylen);
- void (*cit_encrypt_one)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
- void (*cit_decrypt_one)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
-};
-
-#define crt_cipher crt_u.cipher
-
struct crypto_tfm {
u32 crt_flags;
- union {
- struct cipher_tfm cipher;
- } crt_u;
-
void (*exit)(struct crypto_tfm *tfm);
struct crypto_alg *__crt_alg;
@@ -752,12 +739,6 @@ static inline struct crypto_cipher *__crypto_cipher_cast(struct crypto_tfm *tfm)
return (struct crypto_cipher *)tfm;
}
-static inline struct crypto_cipher *crypto_cipher_cast(struct crypto_tfm *tfm)
-{
- BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
- return __crypto_cipher_cast(tfm);
-}
-
/**
* crypto_alloc_cipher() - allocate single block cipher handle
* @alg_name: is the cra_name / name or cra_driver_name / driver name of the
@@ -815,11 +796,6 @@ static inline int crypto_has_cipher(const char *alg_name, u32 type, u32 mask)
return crypto_has_alg(alg_name, type, mask);
}
-static inline struct cipher_tfm *crypto_cipher_crt(struct crypto_cipher *tfm)
-{
- return &crypto_cipher_tfm(tfm)->crt_cipher;
-}
-
/**
* crypto_cipher_blocksize() - obtain block size for cipher
* @tfm: cipher handle
@@ -873,12 +849,8 @@ static inline void crypto_cipher_clear_flags(struct crypto_cipher *tfm,
*
* Return: 0 if the setting of the key was successful; < 0 if an error occurred
*/
-static inline int crypto_cipher_setkey(struct crypto_cipher *tfm,
- const u8 *key, unsigned int keylen)
-{
- return crypto_cipher_crt(tfm)->cit_setkey(crypto_cipher_tfm(tfm),
- key, keylen);
-}
+int crypto_cipher_setkey(struct crypto_cipher *tfm,
+ const u8 *key, unsigned int keylen);
/**
* crypto_cipher_encrypt_one() - encrypt one block of plaintext
@@ -889,12 +861,8 @@ static inline int crypto_cipher_setkey(struct crypto_cipher *tfm,
* Invoke the encryption operation of one block. The caller must ensure that
* the plaintext and ciphertext buffers are at least one block in size.
*/
-static inline void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,
- u8 *dst, const u8 *src)
-{
- crypto_cipher_crt(tfm)->cit_encrypt_one(crypto_cipher_tfm(tfm),
- dst, src);
-}
+void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,
+ u8 *dst, const u8 *src);
/**
* crypto_cipher_decrypt_one() - decrypt one block of ciphertext
@@ -905,12 +873,8 @@ static inline void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,
* Invoke the decryption operation of one block. The caller must ensure that
* the plaintext and ciphertext buffers are at least one block in size.
*/
-static inline void crypto_cipher_decrypt_one(struct crypto_cipher *tfm,
- u8 *dst, const u8 *src)
-{
- crypto_cipher_crt(tfm)->cit_decrypt_one(crypto_cipher_tfm(tfm),
- dst, src);
-}
+void crypto_cipher_decrypt_one(struct crypto_cipher *tfm,
+ u8 *dst, const u8 *src);
static inline struct crypto_comp *__crypto_comp_cast(struct crypto_tfm *tfm)
{