[CRYPTO] api: Added crypto_type support
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@xxxxxxxxxxxxxxxxxxx>
---
crypto/api.c | 32 +++++++++++++++++++++++---------
include/crypto/algapi.h | 6 ++++++
include/linux/crypto.h | 3 +++
3 files changed, 32 insertions(+), 9 deletions(-)
diff --git a/crypto/api.c b/crypto/api.c
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -226,17 +226,18 @@ static int crypto_init_flags(struct cryp
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
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 crypt
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)
diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -16,6 +16,12 @@
struct module;
+struct crypto_type {
+ unsigned int (*ctxsize)(struct crypto_alg *alg);
+ int (*init)(struct crypto_tfm *tfm);
+ void (*exit)(struct crypto_tfm *tfm);
+};
+
struct crypto_instance {
struct crypto_alg alg;
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -78,6 +78,7 @@
struct scatterlist;
struct crypto_tfm;
+struct crypto_type;
struct cipher_desc {
struct crypto_tfm *tfm;
@@ -149,6 +150,8 @@ 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;
-
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