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[CRYPTO] api: Added crypto_type support

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This patch adds the crypto_type structure which will be used for all new
crypto algorithm types, beginning with block ciphers.

The primary purpose of this abstraction is to allow different crypto_type
objects for crypto algorithms of the same type, in particular, there will
be a different crypto_type objects for asynchronous algorithms.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2006-08-22 00:06:54 +10:00
parent 8f21cf0d2b
commit e853c3cfa8
4 changed files with 38 additions and 10 deletions
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32
crypto/api.c
View file

@ -226,17 +226,18 @@ static int crypto_init_flags(struct crypto_tfm *tfm, u32 flags)
case CRYPTO_ALG_TYPE_COMPRESS:
return crypto_init_compress_flags(tfm, flags);
default:
break;
}
BUG();
return -EINVAL;
return 0;
}
static int crypto_init_ops(struct crypto_tfm *tfm)
{
const struct crypto_type *type = tfm->__crt_alg->cra_type;
if (type)
return type->init(tfm);
switch (crypto_tfm_alg_type(tfm)) {
case CRYPTO_ALG_TYPE_CIPHER:
return crypto_init_cipher_ops(tfm);
@ -257,6 +258,14 @@ static int crypto_init_ops(struct crypto_tfm *tfm)
static void crypto_exit_ops(struct crypto_tfm *tfm)
{
const struct crypto_type *type = tfm->__crt_alg->cra_type;
if (type) {
if (type->exit)
type->exit(tfm);
return;
}
switch (crypto_tfm_alg_type(tfm)) {
case CRYPTO_ALG_TYPE_CIPHER:
crypto_exit_cipher_ops(tfm);
@ -278,26 +287,31 @@ static void crypto_exit_ops(struct crypto_tfm *tfm)
static unsigned int crypto_ctxsize(struct crypto_alg *alg, int flags)
{
const struct crypto_type *type = alg->cra_type;
unsigned int len;
len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1);
if (type)
return len + type->ctxsize(alg);
switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
default:
BUG();
case CRYPTO_ALG_TYPE_CIPHER:
len = crypto_cipher_ctxsize(alg, flags);
len += crypto_cipher_ctxsize(alg, flags);
break;
case CRYPTO_ALG_TYPE_DIGEST:
len = crypto_digest_ctxsize(alg, flags);
len += crypto_digest_ctxsize(alg, flags);
break;
case CRYPTO_ALG_TYPE_COMPRESS:
len = crypto_compress_ctxsize(alg, flags);
len += crypto_compress_ctxsize(alg, flags);
break;
}
return len + (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
return len;
}
void crypto_shoot_alg(struct crypto_alg *alg)

5
crypto/proc.c
View file

@ -78,7 +78,10 @@ static int c_show(struct seq_file *m, void *p)
seq_printf(m, "type : compression\n");
break;
default:
seq_printf(m, "type : unknown\n");
if (alg->cra_type && alg->cra_type->show)
alg->cra_type->show(m, alg);
else
seq_printf(m, "type : unknown\n");
break;
}

8
include/crypto/algapi.h
View file

@ -15,6 +15,14 @@
#include <linux/crypto.h>
struct module;
struct seq_file;
struct crypto_type {
unsigned int (*ctxsize)(struct crypto_alg *alg);
int (*init)(struct crypto_tfm *tfm);
void (*exit)(struct crypto_tfm *tfm);
void (*show)(struct seq_file *m, struct crypto_alg *alg);
};
struct crypto_instance {
struct crypto_alg alg;

3
include/linux/crypto.h
View file

@ -90,6 +90,7 @@
struct scatterlist;
struct crypto_tfm;
struct crypto_type;
struct cipher_desc {
struct crypto_tfm *tfm;
@ -161,6 +162,8 @@ struct crypto_alg {
char cra_name[CRYPTO_MAX_ALG_NAME];
char cra_driver_name[CRYPTO_MAX_ALG_NAME];
const struct crypto_type *cra_type;
union {
struct cipher_alg cipher;
struct digest_alg digest;