feat: add gmssl headers

include/gmssl/rc4.h

@@ -0,0 +1,40 @@
+/*
+ *  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
+ */
+
+
+
+#ifndef GMSSL_RC4_H
+#define GMSSL_RC4_H
+
+
+#include <string.h>
+#include <stdint.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#define RC4_MIN_KEY_BITS	40
+#define RC4_STATE_NUM_WORDS	256
+
+
+typedef struct {
+	uint8_t d[RC4_STATE_NUM_WORDS];
+} RC4_STATE;
+
+void rc4_init(RC4_STATE *state, const uint8_t *key, size_t keylen);
+void rc4_generate_keystream(RC4_STATE *state, size_t outlen, uint8_t *out);
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif