Move c_src dirs back to toplevel

[bcachefs-tools-debian] / linux / crypto / api.c

diff --git a/linux/crypto/api.c b/linux/crypto/api.c
new file mode 100644 (file)
index 0000000..2f3ab2b
--- /dev/null
+++ b/linux/crypto/api.c
@@ -0,0 +1,114 @@
+/*
+ * Cryptographic API for algorithms (i.e., low-level API).
+ *
+ * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/rwsem.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include <crypto/algapi.h>
+
+static LIST_HEAD(crypto_alg_list);
+static DECLARE_RWSEM(crypto_alg_sem);
+
+struct crypto_type {
+};
+
+int crypto_register_alg(struct crypto_alg *alg)
+{
+       down_write(&crypto_alg_sem);
+       list_add(&alg->cra_list, &crypto_alg_list);
+       up_write(&crypto_alg_sem);
+
+       return 0;
+}
+
+static void *crypto_alloc_tfm(const char *name,
+                             const struct crypto_type *type)
+{
+       struct crypto_alg *alg;
+
+       down_read(&crypto_alg_sem);
+       list_for_each_entry(alg, &crypto_alg_list, cra_list)
+               if (alg->cra_type == type && !strcmp(alg->cra_name, name))
+                       goto found;
+
+       alg = ERR_PTR(-ENOENT);
+found:
+       up_read(&crypto_alg_sem);
+
+       if (IS_ERR(alg))
+               return ERR_CAST(alg);
+
+       return alg->alloc_tfm() ?: ERR_PTR(-ENOMEM);
+}
+
+/* skcipher: */
+
+static const struct crypto_type crypto_skcipher_type2 = {
+};
+
+struct crypto_skcipher *crypto_alloc_skcipher(const char *name,
+                                             u32 type, u32 mask)
+{
+       return crypto_alloc_tfm(name, &crypto_skcipher_type2);
+}
+
+int crypto_register_skcipher(struct skcipher_alg *alg)
+{
+       alg->base.cra_type = &crypto_skcipher_type2;
+
+       return crypto_register_alg(&alg->base);
+}
+
+/* shash: */
+
+#include <crypto/hash.h>
+
+static int shash_finup(struct shash_desc *desc, const u8 *data,
+                      unsigned len, u8 *out)
+{
+       return crypto_shash_update(desc, data, len) ?:
+              crypto_shash_final(desc, out);
+}
+
+static int shash_digest(struct shash_desc *desc, const u8 *data,
+                                 unsigned len, u8 *out)
+{
+       return crypto_shash_init(desc) ?:
+              crypto_shash_finup(desc, data, len, out);
+}
+
+static const struct crypto_type crypto_shash_type = {
+};
+
+struct crypto_shash *crypto_alloc_shash(const char *name,
+                                       u32 type, u32 mask)
+{
+       return crypto_alloc_tfm(name, &crypto_shash_type);
+}
+
+int crypto_register_shash(struct shash_alg *alg)
+{
+       alg->base.cra_type = &crypto_shash_type;
+
+       if (!alg->finup)
+               alg->finup = shash_finup;
+       if (!alg->digest)
+               alg->digest = shash_digest;
+
+       return crypto_register_alg(&alg->base);
+}