feat: add gmssl headers

include/gmssl/chacha20.h

@@ -0,0 +1,57 @@
+/*
+ *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the License); you may
+ *  not use this file except in compliance with the License.
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ */
+
+
+/* RFC 8439 "ChaCha20 and Poly1305 for IETF Protocols" */
+
+#ifndef GMSSL_CHACHA20_H
+#define GMSSL_CHACHA20_H
+
+#define CHACHA20_IS_BIG_ENDIAN	0
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#include <string.h>
+
+#define CHACHA20_KEY_BITS	256
+#define CHACHA20_NONCE_BITS	96
+#define CHACHA20_COUNTER_BITS	32
+
+#define CHACHA20_KEY_SIZE	(CHACHA20_KEY_BITS/8)
+#define CHACHA20_NONCE_SIZE	(CHACHA20_NONCE_BITS/8)
+#define CHACHA20_COUNTER_SIZE	(CHACHA20_COUNTER_BITS/8)
+
+#define CHACHA20_KEY_WORDS	(CHACHA20_KEY_SIZE/sizeof(uint32_t))
+#define CHACHA20_NONCE_WORDS	(CHACHA20_NONCE_SIZE/sizeof(uint32_t))
+#define CHACHA20_COUNTER_WORDS	(CHACHA20_COUNTER_SIZE/sizeof(uint32_t))
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+typedef struct {
+	uint32_t d[16];
+} CHACHA20_STATE;
+
+
+void chacha20_init(CHACHA20_STATE *state,
+	const uint8_t key[CHACHA20_KEY_SIZE],
+	const uint8_t nonce[CHACHA20_NONCE_SIZE], uint32_t counter);
+
+void chacha20_generate_keystream(CHACHA20_STATE *state,
+	size_t counts, uint8_t *out);
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif