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authorHerbert Xu <herbert@gondor.apana.org.au>2006-08-21 11:08:13 (GMT)
committerHerbert Xu <herbert@gondor.apana.org.au>2006-09-21 01:16:30 (GMT)
commitcce9e06d100df19a327b19f23adad76e7bf63edd (patch)
treece10f50679db9ed8db92912c104eef1f05efc3c5 /crypto/algapi.c
parent9409f38a0c8773c04bff8dda8c552d7ea013d956 (diff)
[CRYPTO] api: Split out low-level API
The crypto API is made up of the part facing users such as IPsec and the low-level part which is used by cryptographic entities such as algorithms. This patch splits out the latter so that the two APIs are more clearly delineated. As a bonus the low-level API can now be modularised if all algorithms are built as modules. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/algapi.c')
-rw-r--r--crypto/algapi.c118
1 files changed, 118 insertions, 0 deletions
diff --git a/crypto/algapi.c b/crypto/algapi.c
new file mode 100644
index 0000000..a65c6cc
--- /dev/null
+++ b/crypto/algapi.c
@@ -0,0 +1,118 @@
+/*
+ * 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/errno.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+
+#include "internal.h"
+
+static inline int crypto_set_driver_name(struct crypto_alg *alg)
+{
+ static const char suffix[] = "-generic";
+ char *driver_name = alg->cra_driver_name;
+ int len;
+
+ if (*driver_name)
+ return 0;
+
+ len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
+ if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
+ return -ENAMETOOLONG;
+
+ memcpy(driver_name + len, suffix, sizeof(suffix));
+ return 0;
+}
+
+int crypto_register_alg(struct crypto_alg *alg)
+{
+ int ret;
+ struct crypto_alg *q;
+
+ if (alg->cra_alignmask & (alg->cra_alignmask + 1))
+ return -EINVAL;
+
+ if (alg->cra_alignmask & alg->cra_blocksize)
+ return -EINVAL;
+
+ if (alg->cra_blocksize > PAGE_SIZE / 8)
+ return -EINVAL;
+
+ if (alg->cra_priority < 0)
+ return -EINVAL;
+
+ ret = crypto_set_driver_name(alg);
+ if (unlikely(ret))
+ return ret;
+
+ down_write(&crypto_alg_sem);
+
+ list_for_each_entry(q, &crypto_alg_list, cra_list) {
+ if (q == alg) {
+ ret = -EEXIST;
+ goto out;
+ }
+ }
+
+ list_add(&alg->cra_list, &crypto_alg_list);
+ atomic_set(&alg->cra_refcnt, 1);
+out:
+ up_write(&crypto_alg_sem);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(crypto_register_alg);
+
+int crypto_unregister_alg(struct crypto_alg *alg)
+{
+ int ret = -ENOENT;
+ struct crypto_alg *q;
+
+ down_write(&crypto_alg_sem);
+ list_for_each_entry(q, &crypto_alg_list, cra_list) {
+ if (alg == q) {
+ list_del(&alg->cra_list);
+ ret = 0;
+ goto out;
+ }
+ }
+out:
+ up_write(&crypto_alg_sem);
+
+ if (ret)
+ return ret;
+
+ BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
+ if (alg->cra_destroy)
+ alg->cra_destroy(alg);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_alg);
+
+static int __init crypto_algapi_init(void)
+{
+ crypto_init_proc();
+ return 0;
+}
+
+static void __exit crypto_algapi_exit(void)
+{
+ crypto_exit_proc();
+}
+
+module_init(crypto_algapi_init);
+module_exit(crypto_algapi_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Cryptographic algorithms API");

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