[RFC PATCH crypto -v3 1/2] AES-NI: Add support to accessunderlying blkcipher under cryptd ablkcipher

[Huang Ying]

cryptd_alloc_ablkcipher() will allocate a cryptd-ed ablkcipher for
specified algorithm name. The new allocated one is guaranteed to be
cryptd-ed ablkcipher, so the blkcipher underlying can be gotten via
cryptd_ablkcipher_child().

Signed-off-by: Huang Ying <ying.huang@xxxxxxxxx>

---
 crypto/cryptd.c         |   19 +++++++++++++++++++
 include/crypto/algapi.h |    5 +++++
 2 files changed, 24 insertions(+)

--- a/crypto/cryptd.c
+++ b/crypto/cryptd.c
@@ -537,6 +537,25 @@ static struct crypto_template cryptd_tmp
 	.module = THIS_MODULE,
 };
 
+struct crypto_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
+						  u32 type, u32 mask)
+{
+	char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
+
+	if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
+		     "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
+		return ERR_PTR(-EINVAL);
+	return crypto_alloc_ablkcipher(cryptd_alg_name, type, mask);
+}
+EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);
+
+struct crypto_blkcipher *cryptd_ablkcipher_child(struct crypto_ablkcipher *tfm)
+{
+	struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(tfm);
+	return ctx->child;
+}
+EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);
+
 static inline int cryptd_create_thread(struct cryptd_state *state,
 				       int (*fn)(void *data), const char *name)
 {
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -145,6 +145,11 @@ int blkcipher_walk_virt_block(struct blk
 			      struct blkcipher_walk *walk,
 			      unsigned int blocksize);
 
+/* alg_name should be algorithm to be cryptd-ed */
+struct crypto_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
+						  u32 type, u32 mask);
+struct crypto_blkcipher *cryptd_ablkcipher_child(struct crypto_ablkcipher *tfm);
+
 static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
 {
 	unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);

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