crypto: cryptd - Add support to access underlying blkcipher

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@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/cryptd.c b/crypto/cryptd.c
index d29e06b..93b98c5 100644 (file)
--- a/crypto/cryptd.c
+++ b/crypto/cryptd.c
@@ -12,6 +12,7 @@
 
 #include <crypto/algapi.h>
 #include <crypto/internal/hash.h>
+#include <crypto/cryptd.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
@@ -537,6 +538,40 @@ static struct crypto_template cryptd_tmpl = {
        .module = THIS_MODULE,
 };
 
+struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
+                                                 u32 type, u32 mask)
+{
+       char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
+       struct crypto_ablkcipher *tfm;
+
+       if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
+                    "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
+               return ERR_PTR(-EINVAL);
+       tfm = crypto_alloc_ablkcipher(cryptd_alg_name, type, mask);
+       if (IS_ERR(tfm))
+               return ERR_CAST(tfm);
+       if (crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_module != THIS_MODULE) {
+               crypto_free_ablkcipher(tfm);
+               return ERR_PTR(-EINVAL);
+       }
+
+       return __cryptd_ablkcipher_cast(tfm);
+}
+EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);
+
+struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm)
+{
+       struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
+       return ctx->child;
+}
+EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);
+
+void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)
+{
+       crypto_free_ablkcipher(&tfm->base);
+}
+EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);
+
 static inline int cryptd_create_thread(struct cryptd_state *state,
                                       int (*fn)(void *data), const char *name)
 {

diff --git a/include/crypto/cryptd.h b/include/crypto/cryptd.h
new file mode 100644 (file)
index 0000000..55fa7bb
--- /dev/null
+++ b/include/crypto/cryptd.h
@@ -0,0 +1,27 @@
+/*
+ * Software async crypto daemon
+ */
+
+#ifndef _CRYPTO_CRYPT_H
+#define _CRYPTO_CRYPT_H
+
+#include <linux/crypto.h>
+#include <linux/kernel.h>
+
+struct cryptd_ablkcipher {
+       struct crypto_ablkcipher base;
+};
+
+static inline struct cryptd_ablkcipher *__cryptd_ablkcipher_cast(
+       struct crypto_ablkcipher *tfm)
+{
+       return (struct cryptd_ablkcipher *)tfm;
+}
+
+/* alg_name should be algorithm to be cryptd-ed */
+struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
+                                                 u32 type, u32 mask);
+struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm);
+void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm);
+
+#endif