1 files changed, 31 insertions, 0 deletions
diff --git a/installer/fetcher/crypto.h b/installer/fetcher/crypto.h
new file mode 100644
index 00000000..bad9d0e9
--- /dev/null
+++ b/installer/fetcher/crypto.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (c) 2017-2020, Loup Vaillant. All rights reserved.
+ * Copyright (C) 2020 Jason A. Donenfeld. All Rights Reserved.
+ */
+
+#ifndef _CRYPTO_H
+#define _CRYPTO_H
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+typedef struct {
+	uint64_t hash[8];
+	uint64_t input_offset[2];
+	uint64_t input[16];
+	size_t   input_idx;
+	size_t   hash_size;
+} blake2b_ctx;
+
+void blake2b_init(blake2b_ctx *ctx, size_t hash_size, const uint8_t *key, size_t key_size);
+
+void blake2b_update(blake2b_ctx *ctx, const void *message, size_t message_size);
+
+void blake2b_final(blake2b_ctx *ctx, uint8_t *hash);
+
+bool ed25519_verify(const uint8_t signature[64], const uint8_t public_key[32],
+		    const void *message, size_t message_size);
+
+#endif