1 files changed, 29 insertions, 0 deletions
diff --git a/installer/fetcher/crypto.h b/installer/fetcher/crypto.h
new file mode 100644
index 00000000..dc234ec7
--- /dev/null
+++ b/installer/fetcher/crypto.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (C) 2020-2022 Jason A. Donenfeld. All Rights Reserved.
+ */
+
+#ifndef _CRYPTO_H
+#define _CRYPTO_H
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+struct blake2b256_state {
+	uint64_t h[8];
+	uint64_t t[2];
+	uint64_t f[2];
+	uint8_t buf[128];
+	size_t buflen;
+};
+
+void blake2b256_init(struct blake2b256_state *state);
+void blake2b256_update(struct blake2b256_state *state, const uint8_t *in,
+		       unsigned int inlen);
+void blake2b256_final(struct blake2b256_state *state, uint8_t out[32]);
+
+bool ed25519_verify(const uint8_t signature[64], const uint8_t public_key[32],
+		    const void *message, size_t message_size);
+
+#endif