crypto: ecdh - Add ECDH software support

[mirror_ubuntu-zesty-kernel.git] / crypto / ecdh_helper.c

diff --git a/crypto/ecdh_helper.c b/crypto/ecdh_helper.c
new file mode 100644 (file)
index 0000000..3cd8a24
--- /dev/null
+++ b/crypto/ecdh_helper.c
@@ -0,0 +1,86 @@
+/*
+ * 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 Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <crypto/ecdh.h>
+#include <crypto/kpp.h>
+
+#define ECDH_KPP_SECRET_MIN_SIZE (sizeof(struct kpp_secret) + 2 * sizeof(short))
+
+static inline u8 *ecdh_pack_data(void *dst, const void *src, size_t sz)
+{
+       memcpy(dst, src, sz);
+       return dst + sz;
+}
+
+static inline const u8 *ecdh_unpack_data(void *dst, const void *src, size_t sz)
+{
+       memcpy(dst, src, sz);
+       return src + sz;
+}
+
+int crypto_ecdh_key_len(const struct ecdh *params)
+{
+       return ECDH_KPP_SECRET_MIN_SIZE + params->key_size;
+}
+EXPORT_SYMBOL_GPL(crypto_ecdh_key_len);
+
+int crypto_ecdh_encode_key(char *buf, unsigned int len,
+                          const struct ecdh *params)
+{
+       u8 *ptr = buf;
+       struct kpp_secret secret = {
+               .type = CRYPTO_KPP_SECRET_TYPE_ECDH,
+               .len = len
+       };
+
+       if (unlikely(!buf))
+               return -EINVAL;
+
+       if (len != crypto_ecdh_key_len(params))
+               return -EINVAL;
+
+       ptr = ecdh_pack_data(ptr, &secret, sizeof(secret));
+       ptr = ecdh_pack_data(ptr, &params->curve_id, sizeof(params->curve_id));
+       ptr = ecdh_pack_data(ptr, &params->key_size, sizeof(params->key_size));
+       ecdh_pack_data(ptr, params->key, params->key_size);
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_ecdh_encode_key);
+
+int crypto_ecdh_decode_key(const char *buf, unsigned int len,
+                          struct ecdh *params)
+{
+       const u8 *ptr = buf;
+       struct kpp_secret secret;
+
+       if (unlikely(!buf || len < ECDH_KPP_SECRET_MIN_SIZE))
+               return -EINVAL;
+
+       ptr = ecdh_unpack_data(&secret, ptr, sizeof(secret));
+       if (secret.type != CRYPTO_KPP_SECRET_TYPE_ECDH)
+               return -EINVAL;
+
+       ptr = ecdh_unpack_data(&params->curve_id, ptr, sizeof(params->curve_id));
+       ptr = ecdh_unpack_data(&params->key_size, ptr, sizeof(params->key_size));
+       if (secret.len != crypto_ecdh_key_len(params))
+               return -EINVAL;
+
+       /* Don't allocate memory. Set pointer to data
+        * within the given buffer
+        */
+       params->key = (void *)ptr;
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_ecdh_decode_key);