1 /* 2 * Copyright 2014-2022 The GmSSL Project. All Rights Reserved. 3 * 4 * Licensed under the Apache License, Version 2.0 (the License); you may 5 * not use this file except in compliance with the License. 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 */ 9 10 11 12 #ifndef GMSSL_RC4_H 13 #define GMSSL_RC4_H 14 15 16 #include <string.h> 17 #include <stdint.h> 18 19 20 #ifdef __cplusplus 21 extern "C" { 22 #endif 23 24 25 #define RC4_MIN_KEY_BITS 40 26 #define RC4_STATE_NUM_WORDS 256 27 28 29 typedef struct { 30 uint8_t d[RC4_STATE_NUM_WORDS]; 31 } RC4_STATE; 32 33 void rc4_init(RC4_STATE *state, const uint8_t *key, size_t keylen); 34 void rc4_generate_keystream(RC4_STATE *state, size_t outlen, uint8_t *out); 35 36 37 #ifdef __cplusplus 38 } 39 #endif 40 #endif 41