crypto: kpp - Key-agreement Protocol Primitives API (KPP)

[cascardo/linux.git] / crypto / kpp.c

diff --git a/crypto/kpp.c b/crypto/kpp.c
new file mode 100644 (file)
index 0000000..d36ce05
--- /dev/null
+++ b/crypto/kpp.c
@@ -0,0 +1,123 @@
+/*
+ * Key-agreement Protocol Primitives (KPP)
+ *
+ * Copyright (c) 2016, Intel Corporation
+ * Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/crypto.h>
+#include <crypto/algapi.h>
+#include <linux/cryptouser.h>
+#include <net/netlink.h>
+#include <crypto/kpp.h>
+#include <crypto/internal/kpp.h>
+#include "internal.h"
+
+#ifdef CONFIG_NET
+static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+       struct crypto_report_kpp rkpp;
+
+       strncpy(rkpp.type, "kpp", sizeof(rkpp.type));
+
+       if (nla_put(skb, CRYPTOCFGA_REPORT_KPP,
+                   sizeof(struct crypto_report_kpp), &rkpp))
+               goto nla_put_failure;
+       return 0;
+
+nla_put_failure:
+       return -EMSGSIZE;
+}
+#else
+static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+       return -ENOSYS;
+}
+#endif
+
+static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
+       __attribute__ ((unused));
+
+static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg)
+{
+       seq_puts(m, "type         : kpp\n");
+}
+
+static void crypto_kpp_exit_tfm(struct crypto_tfm *tfm)
+{
+       struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
+       struct kpp_alg *alg = crypto_kpp_alg(kpp);
+
+       alg->exit(kpp);
+}
+
+static int crypto_kpp_init_tfm(struct crypto_tfm *tfm)
+{
+       struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm);
+       struct kpp_alg *alg = crypto_kpp_alg(kpp);
+
+       if (alg->exit)
+               kpp->base.exit = crypto_kpp_exit_tfm;
+
+       if (alg->init)
+               return alg->init(kpp);
+
+       return 0;
+}
+
+static const struct crypto_type crypto_kpp_type = {
+       .extsize = crypto_alg_extsize,
+       .init_tfm = crypto_kpp_init_tfm,
+#ifdef CONFIG_PROC_FS
+       .show = crypto_kpp_show,
+#endif
+       .report = crypto_kpp_report,
+       .maskclear = ~CRYPTO_ALG_TYPE_MASK,
+       .maskset = CRYPTO_ALG_TYPE_MASK,
+       .type = CRYPTO_ALG_TYPE_KPP,
+       .tfmsize = offsetof(struct crypto_kpp, base),
+};
+
+struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask)
+{
+       return crypto_alloc_tfm(alg_name, &crypto_kpp_type, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_kpp);
+
+static void kpp_prepare_alg(struct kpp_alg *alg)
+{
+       struct crypto_alg *base = &alg->base;
+
+       base->cra_type = &crypto_kpp_type;
+       base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
+       base->cra_flags |= CRYPTO_ALG_TYPE_KPP;
+}
+
+int crypto_register_kpp(struct kpp_alg *alg)
+{
+       struct crypto_alg *base = &alg->base;
+
+       kpp_prepare_alg(alg);
+       return crypto_register_alg(base);
+}
+EXPORT_SYMBOL_GPL(crypto_register_kpp);
+
+void crypto_unregister_kpp(struct kpp_alg *alg)
+{
+       crypto_unregister_alg(&alg->base);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_kpp);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Key-agreement Protocol Primitives");