[PATCH 1/2] Support for VIA PadLock crypto engine
From: Michal Ludvig
Date: Tue May 11 2004 - 12:20:44 EST
On Mon, 10 May 2004, James Morris wrote:
> We really need a proper framework for this (i.e. per-arch hardware and asm
> support), not just hacks to the software AES module.
OK, I did it cleaner now :-)
First of all I splitted PadLock completely out of crypto/aes.c. Now it
lives in crypto/devices/padlock*.[ch] and can be configured in the
submenu "Crypto options"->"Hardware crypto devices". The compiled
module is called padlock.ko.
I added a new field into "struct crypto_alg" called "cra_preference".
This is set to CRYPTO_PREF_HARDWARE(=1) in the PadLock driver,
normally is equal to CRYPTO_PREF_SOFTWARE(=0). This field is used in
crypto/api.c:crypto_alg_lookup() where the alg entry with the highest
preference is returned. I.e. if both aes.ko and padlock.ko are loaded
(or compiled in), the AES from PadLock is used.
This way you can add new hardware drivers to crypto/devices/, all
of them can support many algorithms (not only ciphers, but also
digests and compression).
It is also possible to autoload padlock.ko whenever AES algo is
requested by adding "alias aes padlock" into /etc/modprobe.conf.
Do you like it better? :-)
BTW Attached is the modified generic patch, in the next mail will
follow the padlock-specific patch.
Michal Ludvig
diff -X exclude.txt -rupN linux-2.6.5.patched/crypto/api.c linux-2.6.5/crypto/api.c
--- linux-2.6.5.patched/crypto/api.c 2004-04-29 10:33:05.000000000 +0200
+++ linux-2.6.5/crypto/api.c 2004-05-11 14:42:55.000000000 +0200
@@ -43,14 +43,16 @@ struct crypto_alg *crypto_alg_lookup(con
down_read(&crypto_alg_sem);
list_for_each_entry(q, &crypto_alg_list, cra_list) {
- if (!(strcmp(q->cra_name, name))) {
- if (crypto_alg_get(q))
- alg = q;
- break;
- }
+ if (!(strcmp(q->cra_name, name))
+ && (!alg || alg->cra_preference < q->cra_preference))
+ alg = q;
}
+ if (! crypto_alg_get(alg))
+ alg = NULL;
+
up_read(&crypto_alg_sem);
+
return alg;
}
@@ -163,20 +165,11 @@ void crypto_free_tfm(struct crypto_tfm *
int crypto_register_alg(struct crypto_alg *alg)
{
int ret = 0;
- struct crypto_alg *q;
down_write(&crypto_alg_sem);
-
- list_for_each_entry(q, &crypto_alg_list, cra_list) {
- if (!(strcmp(q->cra_name, alg->cra_name))) {
- ret = -EEXIST;
- goto out;
- }
- }
-
list_add_tail(&alg->cra_list, &crypto_alg_list);
-out:
up_write(&crypto_alg_sem);
+
return ret;
}
@@ -213,6 +206,19 @@ int crypto_alg_available(const char *nam
return ret;
}
+void *crypto_aligned_kmalloc(size_t size, int mode, size_t alignment, void **index)
+{
+ char *ptr;
+
+ ptr = kmalloc(size + alignment, mode);
+ *index = ptr;
+ if (alignment > 1 && ((long)ptr & (alignment - 1))) {
+ ptr += alignment - ((long)ptr & (alignment - 1));
+ }
+
+ return ptr;
+}
+
static int __init init_crypto(void)
{
printk(KERN_INFO "Initializing Cryptographic API\n");
@@ -227,3 +233,4 @@ EXPORT_SYMBOL_GPL(crypto_unregister_alg)
EXPORT_SYMBOL_GPL(crypto_alloc_tfm);
EXPORT_SYMBOL_GPL(crypto_free_tfm);
EXPORT_SYMBOL_GPL(crypto_alg_available);
+EXPORT_SYMBOL_GPL(crypto_aligned_kmalloc);
diff -X exclude.txt -rupN linux-2.6.5.patched/crypto/cipher.c linux-2.6.5/crypto/cipher.c
--- linux-2.6.5.patched/crypto/cipher.c 2004-04-29 10:33:05.000000000 +0200
+++ linux-2.6.5/crypto/cipher.c 2004-05-10 15:21:56.000000000 +0200
@@ -20,7 +20,31 @@
#include "internal.h"
#include "scatterwalk.h"
+#define CRA_CIPHER(tfm) (tfm)->__crt_alg->cra_cipher
+
+#define DEF_TFM_FUNCTION(name,mode,encdec,iv) \
+static int name(struct crypto_tfm *tfm, \
+ struct scatterlist *dst, \
+ struct scatterlist *src, \
+ unsigned int nbytes) \
+{ \
+ return crypt(tfm, dst, src, nbytes, \
+ mode, encdec, iv); \
+}
+
+#define DEF_TFM_FUNCTION_IV(name,mode,encdec,iv) \
+static int name(struct crypto_tfm *tfm, \
+ struct scatterlist *dst, \
+ struct scatterlist *src, \
+ unsigned int nbytes, u8 *iv) \
+{ \
+ return crypt(tfm, dst, src, nbytes, \
+ mode, encdec, iv); \
+}
+
typedef void (cryptfn_t)(void *, u8 *, const u8 *);
+typedef void (cryptblkfn_t)(void *, u8 *, const u8 *, const u8 *,
+ size_t, int, int);
typedef void (procfn_t)(struct crypto_tfm *, u8 *,
u8*, cryptfn_t, int enc, void *, int);
@@ -38,6 +62,36 @@ static inline void xor_128(u8 *a, const
((u32 *)a)[3] ^= ((u32 *)b)[3];
}
+static void cbc_process(struct crypto_tfm *tfm, u8 *dst, u8 *src,
+ cryptfn_t *fn, int enc, void *info, int in_place)
+{
+ u8 *iv = info;
+
+ /* Null encryption */
+ if (!iv)
+ return;
+
+ if (enc) {
+ tfm->crt_u.cipher.cit_xor_block(iv, src);
+ (*fn)(crypto_tfm_ctx(tfm), dst, iv);
+ memcpy(iv, dst, crypto_tfm_alg_blocksize(tfm));
+ } else {
+ u8 stack[in_place ? crypto_tfm_alg_blocksize(tfm) : 0];
+ u8 *buf = in_place ? stack : dst;
+
+ (*fn)(crypto_tfm_ctx(tfm), buf, src);
+ tfm->crt_u.cipher.cit_xor_block(buf, iv);
+ memcpy(iv, src, crypto_tfm_alg_blocksize(tfm));
+ if (buf != dst)
+ memcpy(dst, buf, crypto_tfm_alg_blocksize(tfm));
+ }
+}
+
+static void ecb_process(struct crypto_tfm *tfm, u8 *dst, u8 *src,
+ cryptfn_t fn, int enc, void *info, int in_place)
+{
+ (*fn)(crypto_tfm_ctx(tfm), dst, src);
+}
/*
* Generic encrypt/decrypt wrapper for ciphers, handles operations across
@@ -47,20 +101,92 @@ static inline void xor_128(u8 *a, const
static int crypt(struct crypto_tfm *tfm,
struct scatterlist *dst,
struct scatterlist *src,
- unsigned int nbytes, cryptfn_t crfn,
- procfn_t prfn, int enc, void *info)
+ unsigned int nbytes,
+ int mode, int enc, void *info)
{
+ cryptfn_t *cryptofn = NULL;
+ procfn_t *processfn = NULL;
+ cryptblkfn_t *cryptomultiblockfn = NULL;
+
struct scatter_walk walk_in, walk_out;
- const unsigned int bsize = crypto_tfm_alg_blocksize(tfm);
- u8 tmp_src[nbytes > src->length ? bsize : 0];
- u8 tmp_dst[nbytes > dst->length ? bsize : 0];
+ size_t max_nbytes = crypto_tfm_alg_max_nbytes(tfm);
+ size_t bsize = crypto_tfm_alg_blocksize(tfm);
+ int req_align = crypto_tfm_alg_req_align(tfm);
+ int ret = 0;
+ void *index_src = NULL, *index_dst = NULL;
+ u8 *iv = info;
+ u8 *tmp_src, *tmp_dst;
if (!nbytes)
- return 0;
+ return ret;
if (nbytes % bsize) {
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
+ }
+
+ switch (mode) {
+ case CRYPTO_TFM_MODE_ECB:
+ if (CRA_CIPHER(tfm).cia_ecb)
+ cryptomultiblockfn = CRA_CIPHER(tfm).cia_ecb;
+ else {
+ cryptofn = (enc == CRYPTO_DIR_ENCRYPT) ? CRA_CIPHER(tfm).cia_encrypt : CRA_CIPHER(tfm).cia_decrypt;
+ processfn = ecb_process;
+ }
+ break;
+
+ case CRYPTO_TFM_MODE_CBC:
+ if (CRA_CIPHER(tfm).cia_cbc)
+ cryptomultiblockfn = CRA_CIPHER(tfm).cia_cbc;
+ else {
+ cryptofn = (enc == CRYPTO_DIR_ENCRYPT) ? CRA_CIPHER(tfm).cia_encrypt : CRA_CIPHER(tfm).cia_decrypt;
+ processfn = cbc_process;
+ }
+ break;
+
+ /* Until we have the appropriate {ofb,cfb,ctr}_process() functions,
+ the following cases will return -ENOSYS if there is no HW support
+ for the mode. */
+ case CRYPTO_TFM_MODE_OFB:
+ if (CRA_CIPHER(tfm).cia_ofb)
+ cryptomultiblockfn = CRA_CIPHER(tfm).cia_ofb;
+ else
+ return -ENOSYS;
+ break;
+
+ case CRYPTO_TFM_MODE_CFB:
+ if (CRA_CIPHER(tfm).cia_cfb)
+ cryptomultiblockfn = CRA_CIPHER(tfm).cia_cfb;
+ else
+ return -ENOSYS;
+ break;
+
+ case CRYPTO_TFM_MODE_CTR:
+ if (CRA_CIPHER(tfm).cia_ctr)
+ cryptomultiblockfn = CRA_CIPHER(tfm).cia_ctr;
+ else
+ return -ENOSYS;
+ break;
+
+ default:
+ BUG();
+ }
+
+ if (cryptomultiblockfn)
+ bsize = (max_nbytes > nbytes) ? nbytes : max_nbytes;
+
+ /* Some hardware crypto engines may require a specific
+ alignment of the buffers. We will align the buffers
+ already here to avoid their reallocating later. */
+ tmp_src = crypto_aligned_kmalloc(bsize, GFP_KERNEL,
+ req_align, &index_src);
+ tmp_dst = crypto_aligned_kmalloc(bsize, GFP_KERNEL,
+ req_align, &index_dst);
+
+ if (!index_src || !index_dst) {
+ ret = -ENOMEM;
+ goto out;
}
scatterwalk_start(&walk_in, src);
@@ -71,16 +197,23 @@ static int crypt(struct crypto_tfm *tfm,
scatterwalk_map(&walk_in, 0);
scatterwalk_map(&walk_out, 1);
+
src_p = scatterwalk_whichbuf(&walk_in, bsize, tmp_src);
dst_p = scatterwalk_whichbuf(&walk_out, bsize, tmp_dst);
- nbytes -= bsize;
-
scatterwalk_copychunks(src_p, &walk_in, bsize, 0);
- prfn(tfm, dst_p, src_p, crfn, enc, info,
- scatterwalk_samebuf(&walk_in, &walk_out,
- src_p, dst_p));
+ nbytes -= bsize;
+
+ if (cryptomultiblockfn)
+ (*cryptomultiblockfn)(crypto_tfm_ctx(tfm),
+ dst_p, src_p, iv, bsize, enc,
+ scatterwalk_samebuf(&walk_in, &walk_out,
+ src_p, dst_p));
+ else
+ (*processfn)(tfm, dst_p, src_p, cryptofn, enc, info,
+ scatterwalk_samebuf(&walk_in, &walk_out,
+ src_p, dst_p));
scatterwalk_done(&walk_in, 0, nbytes);
@@ -88,46 +221,23 @@ static int crypt(struct crypto_tfm *tfm,
scatterwalk_done(&walk_out, 1, nbytes);
if (!nbytes)
- return 0;
+ goto out;
crypto_yield(tfm);
}
-}
-static void cbc_process(struct crypto_tfm *tfm, u8 *dst, u8 *src,
- cryptfn_t fn, int enc, void *info, int in_place)
-{
- u8 *iv = info;
-
- /* Null encryption */
- if (!iv)
- return;
-
- if (enc) {
- tfm->crt_u.cipher.cit_xor_block(iv, src);
- fn(crypto_tfm_ctx(tfm), dst, iv);
- memcpy(iv, dst, crypto_tfm_alg_blocksize(tfm));
- } else {
- u8 stack[in_place ? crypto_tfm_alg_blocksize(tfm) : 0];
- u8 *buf = in_place ? stack : dst;
+out:
+ if (index_src)
+ kfree(index_src);
+ if (index_dst)
+ kfree(index_dst);
- fn(crypto_tfm_ctx(tfm), buf, src);
- tfm->crt_u.cipher.cit_xor_block(buf, iv);
- memcpy(iv, src, crypto_tfm_alg_blocksize(tfm));
- if (buf != dst)
- memcpy(dst, buf, crypto_tfm_alg_blocksize(tfm));
- }
-}
-
-static void ecb_process(struct crypto_tfm *tfm, u8 *dst, u8 *src,
- cryptfn_t fn, int enc, void *info, int in_place)
-{
- fn(crypto_tfm_ctx(tfm), dst, src);
+ return ret;
}
static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
{
- struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher;
+ struct cipher_alg *cia = &CRA_CIPHER(tfm);
if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize) {
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
@@ -137,80 +247,28 @@ static int setkey(struct crypto_tfm *tfm
&tfm->crt_flags);
}
-static int ecb_encrypt(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src, unsigned int nbytes)
-{
- return crypt(tfm, dst, src, nbytes,
- tfm->__crt_alg->cra_cipher.cia_encrypt,
- ecb_process, 1, NULL);
-}
-
-static int ecb_decrypt(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes)
-{
- return crypt(tfm, dst, src, nbytes,
- tfm->__crt_alg->cra_cipher.cia_decrypt,
- ecb_process, 1, NULL);
-}
-
-static int cbc_encrypt(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes)
-{
- return crypt(tfm, dst, src, nbytes,
- tfm->__crt_alg->cra_cipher.cia_encrypt,
- cbc_process, 1, tfm->crt_cipher.cit_iv);
-}
-
-static int cbc_encrypt_iv(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes, u8 *iv)
-{
- return crypt(tfm, dst, src, nbytes,
- tfm->__crt_alg->cra_cipher.cia_encrypt,
- cbc_process, 1, iv);
-}
+DEF_TFM_FUNCTION(ecb_encrypt, CRYPTO_TFM_MODE_ECB, CRYPTO_DIR_ENCRYPT, NULL);
+DEF_TFM_FUNCTION(ecb_decrypt, CRYPTO_TFM_MODE_ECB, CRYPTO_DIR_DECRYPT, NULL);
-static int cbc_decrypt(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes)
-{
- return crypt(tfm, dst, src, nbytes,
- tfm->__crt_alg->cra_cipher.cia_decrypt,
- cbc_process, 0, tfm->crt_cipher.cit_iv);
-}
-
-static int cbc_decrypt_iv(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes, u8 *iv)
-{
- return crypt(tfm, dst, src, nbytes,
- tfm->__crt_alg->cra_cipher.cia_decrypt,
- cbc_process, 0, iv);
-}
-
-static int nocrypt(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes)
-{
- return -ENOSYS;
-}
-
-static int nocrypt_iv(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes, u8 *iv)
-{
- return -ENOSYS;
-}
+DEF_TFM_FUNCTION(cbc_encrypt, CRYPTO_TFM_MODE_CBC, CRYPTO_DIR_ENCRYPT, tfm->crt_cipher.cit_iv);
+DEF_TFM_FUNCTION_IV(cbc_encrypt_iv, CRYPTO_TFM_MODE_CBC, CRYPTO_DIR_ENCRYPT, iv);
+DEF_TFM_FUNCTION(cbc_decrypt, CRYPTO_TFM_MODE_CBC, CRYPTO_DIR_DECRYPT, tfm->crt_cipher.cit_iv);
+DEF_TFM_FUNCTION_IV(cbc_decrypt_iv, CRYPTO_TFM_MODE_CBC, CRYPTO_DIR_DECRYPT, iv);
+
+DEF_TFM_FUNCTION(cfb_encrypt, CRYPTO_TFM_MODE_CFB, CRYPTO_DIR_ENCRYPT, tfm->crt_cipher.cit_iv);
+DEF_TFM_FUNCTION_IV(cfb_encrypt_iv, CRYPTO_TFM_MODE_CFB, CRYPTO_DIR_ENCRYPT, iv);
+DEF_TFM_FUNCTION(cfb_decrypt, CRYPTO_TFM_MODE_CFB, CRYPTO_DIR_DECRYPT, tfm->crt_cipher.cit_iv);
+DEF_TFM_FUNCTION_IV(cfb_decrypt_iv, CRYPTO_TFM_MODE_CFB, CRYPTO_DIR_DECRYPT, iv);
+
+DEF_TFM_FUNCTION(ofb_encrypt, CRYPTO_TFM_MODE_OFB, CRYPTO_DIR_ENCRYPT, tfm->crt_cipher.cit_iv);
+DEF_TFM_FUNCTION_IV(ofb_encrypt_iv, CRYPTO_TFM_MODE_OFB, CRYPTO_DIR_ENCRYPT, iv);
+DEF_TFM_FUNCTION(ofb_decrypt, CRYPTO_TFM_MODE_OFB, CRYPTO_DIR_DECRYPT, tfm->crt_cipher.cit_iv);
+DEF_TFM_FUNCTION_IV(ofb_decrypt_iv, CRYPTO_TFM_MODE_OFB, CRYPTO_DIR_DECRYPT, iv);
+
+DEF_TFM_FUNCTION(ctr_encrypt, CRYPTO_TFM_MODE_CTR, CRYPTO_DIR_ENCRYPT, tfm->crt_cipher.cit_iv);
+DEF_TFM_FUNCTION_IV(ctr_encrypt_iv, CRYPTO_TFM_MODE_CTR, CRYPTO_DIR_ENCRYPT, iv);
+DEF_TFM_FUNCTION(ctr_decrypt, CRYPTO_TFM_MODE_CTR, CRYPTO_DIR_DECRYPT, tfm->crt_cipher.cit_iv);
+DEF_TFM_FUNCTION_IV(ctr_decrypt_iv, CRYPTO_TFM_MODE_CTR, CRYPTO_DIR_DECRYPT, iv);
int crypto_init_cipher_flags(struct crypto_tfm *tfm, u32 flags)
{
@@ -244,17 +302,24 @@ int crypto_init_cipher_ops(struct crypto
break;
case CRYPTO_TFM_MODE_CFB:
- ops->cit_encrypt = nocrypt;
- ops->cit_decrypt = nocrypt;
- ops->cit_encrypt_iv = nocrypt_iv;
- ops->cit_decrypt_iv = nocrypt_iv;
+ ops->cit_encrypt = cfb_encrypt;
+ ops->cit_decrypt = cfb_decrypt;
+ ops->cit_encrypt_iv = cfb_encrypt_iv;
+ ops->cit_decrypt_iv = cfb_decrypt_iv;
+ break;
+
+ case CRYPTO_TFM_MODE_OFB:
+ ops->cit_encrypt = ofb_encrypt;
+ ops->cit_decrypt = ofb_decrypt;
+ ops->cit_encrypt_iv = ofb_encrypt_iv;
+ ops->cit_decrypt_iv = ofb_decrypt_iv;
break;
case CRYPTO_TFM_MODE_CTR:
- ops->cit_encrypt = nocrypt;
- ops->cit_decrypt = nocrypt;
- ops->cit_encrypt_iv = nocrypt_iv;
- ops->cit_decrypt_iv = nocrypt_iv;
+ ops->cit_encrypt = ctr_encrypt;
+ ops->cit_decrypt = ctr_decrypt;
+ ops->cit_encrypt_iv = ctr_encrypt_iv;
+ ops->cit_decrypt_iv = ctr_decrypt_iv;
break;
default:
diff -X exclude.txt -rup linux-2.6.5.patched/include/linux/crypto.h linux-2.6.5/include/linux/crypto.h
--- linux-2.6.5.patched/include/linux/crypto.h 2004-04-29 10:32:25.000000000 +0200
+++ linux-2.6.5/include/linux/crypto.h 2004-05-11 12:59:11.000000000 +0200
@@ -42,6 +42,7 @@
#define CRYPTO_TFM_MODE_CBC 0x00000002
#define CRYPTO_TFM_MODE_CFB 0x00000004
#define CRYPTO_TFM_MODE_CTR 0x00000008
+#define CRYPTO_TFM_MODE_OFB 0x00000010
#define CRYPTO_TFM_REQ_WEAK_KEY 0x00000100
#define CRYPTO_TFM_RES_WEAK_KEY 0x00100000
@@ -56,6 +57,12 @@
#define CRYPTO_UNSPEC 0
#define CRYPTO_MAX_ALG_NAME 64
+#define CRYPTO_DIR_ENCRYPT 1
+#define CRYPTO_DIR_DECRYPT 0
+
+#define CRYPTO_PREF_SOFTWARE 0
+#define CRYPTO_PREF_HARDWARE 1
+
struct scatterlist;
/*
@@ -69,6 +76,18 @@ struct cipher_alg {
unsigned int keylen, u32 *flags);
void (*cia_encrypt)(void *ctx, u8 *dst, const u8 *src);
void (*cia_decrypt)(void *ctx, u8 *dst, const u8 *src);
+ size_t cia_max_nbytes;
+ size_t cia_req_align;
+ void (*cia_ecb)(void *ctx, u8 *dst, const u8 *src, const u8 *iv,
+ size_t nbytes, int encdec, int inplace);
+ void (*cia_cbc)(void *ctx, u8 *dst, const u8 *src, const u8 *iv,
+ size_t nbytes, int encdec, int inplace);
+ void (*cia_cfb)(void *ctx, u8 *dst, const u8 *src, const u8 *iv,
+ size_t nbytes, int encdec, int inplace);
+ void (*cia_ofb)(void *ctx, u8 *dst, const u8 *src, const u8 *iv,
+ size_t nbytes, int encdec, int inplace);
+ void (*cia_ctr)(void *ctx, u8 *dst, const u8 *src, const u8 *iv,
+ size_t nbytes, int encdec, int inplace);
};
struct digest_alg {
@@ -99,6 +118,7 @@ struct crypto_alg {
unsigned int cra_blocksize;
unsigned int cra_ctxsize;
const char cra_name[CRYPTO_MAX_ALG_NAME];
+ unsigned int cra_preference;
union {
struct cipher_alg cipher;
@@ -121,6 +141,11 @@ int crypto_unregister_alg(struct crypto_
int crypto_alg_available(const char *name, u32 flags);
/*
+ * Helper function.
+ */
+void *crypto_aligned_kmalloc (size_t size, int mode, size_t alignment, void **index);
+
+/*
* Transforms: user-instantiated objects which encapsulate algorithms
* and core processing logic. Managed via crypto_alloc_tfm() and
* crypto_free_tfm(), as well as the various helpers below.
@@ -255,6 +280,18 @@ static inline unsigned int crypto_tfm_al
return tfm->__crt_alg->cra_digest.dia_digestsize;
}
+static inline unsigned int crypto_tfm_alg_max_nbytes(struct crypto_tfm *tfm)
+{
+ BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
+ return tfm->__crt_alg->cra_cipher.cia_max_nbytes;
+}
+
+static inline unsigned int crypto_tfm_alg_req_align(struct crypto_tfm *tfm)
+{
+ BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
+ return tfm->__crt_alg->cra_cipher.cia_req_align;
+}
+
/*
* API wrappers.
*/
-
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