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>

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>
Huang Ying · Herbert Xu
1 parent 1693531e9e
Showing 2 changed files with 62 additions and 0 deletions Side-by-side Diff
crypto/cryptd.c
include/crypto/cryptd.h
@@ -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>
@@ -536,6 +537,40 @@
 	.free = cryptd_free,
 	.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)
+/*
+ * 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
...	...	@@ -12,6 +12,7 @@
12	12
13	13	#include <crypto/algapi.h>
14	14	#include <crypto/internal/hash.h>
	15	+#include <crypto/cryptd.h>
15	16	#include <linux/err.h>
16	17	#include <linux/init.h>
17	18	#include <linux/kernel.h>
...	...	@@ -536,6 +537,40 @@
536	537	.free = cryptd_free,
537	538	.module = THIS_MODULE,
538	539	};
	540	+
	541	+struct cryptd_ablkcipher cryptd_alloc_ablkcipher(const char alg_name,
	542	+ u32 type, u32 mask)
	543	+{
	544	+ char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
	545	+ struct crypto_ablkcipher *tfm;
	546	+
	547	+ if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
	548	+ "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
	549	+ return ERR_PTR(-EINVAL);
	550	+ tfm = crypto_alloc_ablkcipher(cryptd_alg_name, type, mask);
	551	+ if (IS_ERR(tfm))
	552	+ return ERR_CAST(tfm);
	553	+ if (crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_module != THIS_MODULE) {
	554	+ crypto_free_ablkcipher(tfm);
	555	+ return ERR_PTR(-EINVAL);
	556	+ }
	557	+
	558	+ return __cryptd_ablkcipher_cast(tfm);
	559	+}
	560	+EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);
	561	+
	562	+struct crypto_blkcipher cryptd_ablkcipher_child(struct cryptd_ablkcipher tfm)
	563	+{
	564	+ struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
	565	+ return ctx->child;
	566	+}
	567	+EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);
	568	+
	569	+void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)
	570	+{
	571	+ crypto_free_ablkcipher(&tfm->base);
	572	+}
	573	+EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);
539	574
540	575	static inline int cryptd_create_thread(struct cryptd_state *state,
541	576	int (fn)(void data), const char *name)
	1	+/*
	2	+ * Software async crypto daemon
	3	+ */
	4	+
	5	+#ifndef _CRYPTO_CRYPT_H
	6	+#define _CRYPTO_CRYPT_H
	7	+
	8	+#include <linux/crypto.h>
	9	+#include <linux/kernel.h>
	10	+
	11	+struct cryptd_ablkcipher {
	12	+ struct crypto_ablkcipher base;
	13	+};
	14	+
	15	+static inline struct cryptd_ablkcipher *__cryptd_ablkcipher_cast(
	16	+ struct crypto_ablkcipher *tfm)
	17	+{
	18	+ return (struct cryptd_ablkcipher *)tfm;
	19	+}
	20	+
	21	+/* alg_name should be algorithm to be cryptd-ed */
	22	+struct cryptd_ablkcipher cryptd_alloc_ablkcipher(const char alg_name,
	23	+ u32 type, u32 mask);
	24	+struct crypto_blkcipher cryptd_ablkcipher_child(struct cryptd_ablkcipher tfm);
	25	+void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm);
	26	+
	27	+#endif