From 687ecb9f49962e001e306b2050a6b61f2ee8c458 Mon Sep 17 00:00:00 2001
From: Zhi Guan <guanzhi1980@gmail.com>
Date: Wed, 13 Dec 2023 20:16:05 +0800
Subject: [PATCH] Remove RC4

---
 CMakeLists.txt      |  4 +--
 include/gmssl/rc4.h | 40 ----------------------
 src/rc4.c           | 83 ---------------------------------------------
 3 files changed, 2 insertions(+), 125 deletions(-)
 delete mode 100644 include/gmssl/rc4.h
 delete mode 100644 src/rc4.c

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1ecd2ebe..2f51be29 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -249,8 +249,8 @@ endif()
 option(ENABLE_BROKEN_CRYPTO "Enable broken crypto algorithms" OFF)
 if (ENABLE_BROKEN_CRYPTO)
 	message(STATUS "ENABLE_BROKEN_CRYPTO")
-	list(APPEND src src/des.c src/sha1.c src/rc4.c)
-	list(APPEND tests des sha1 rc4)
+	list(APPEND src src/des.c src/sha1.c)
+	list(APPEND tests des sha1)
 endif()
 
 
diff --git a/include/gmssl/rc4.h b/include/gmssl/rc4.h
deleted file mode 100644
index a6a523c3..00000000
--- a/include/gmssl/rc4.h
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- *  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
diff --git a/src/rc4.c b/src/rc4.c
deleted file mode 100644
index e3ae13e1..00000000
--- a/src/rc4.c
+++ /dev/null
@@ -1,83 +0,0 @@
-/*
- *  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
- */
-
-
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <gmssl/rc4.h>
-
-void rc4_init(RC4_STATE *state, const uint8_t *key, size_t keylen)
-{
-	int i, j;
-	uint8_t *s = state->d;
-	uint8_t k[256] = {0};
-	uint8_t temp;
-
-	if (keylen > sizeof(k)) {
-		keylen = sizeof(k);
-	}
-
-	/* expand key */
-	for (i = 0; i < (int)keylen; i++) {
-		k[i] = key[i];
-	}
-	for (; i < 256; i++) {
-		k[i] = key[i % keylen];
-	}
-
-	/* init state */
-	for (i = 0; i < 256; i++) {
-		s[i] = i;
-	}
-
-	/* shuffle state with key */
-	j = 0;
-	for (i = 0; i < 256; i++) {
-		j = (j + s[i] + k[i]) % 256;
-
-		/* swap(s[i], s[j]) */
-		temp = s[j];
-		s[j] = s[i];
-		s[i] = temp;
-	}
-
-	/* clean expanded temp key */
-	memset(k, 0, sizeof(k));
-}
-
-void rc4_generate_keystream(RC4_STATE *state, size_t outlen, uint8_t *out)
-{
-	int i = 0, j = 0;
-	uint8_t *s = state->d;
-	int oi;
-	int temp;
-
-	while (outlen > 0) {
-		i = (i + 1) % 256;
-		j = (j + s[i]) % 256;
-
-		/* swap(s[i], s[j]) */
-		temp = s[j];
-		s[j] = s[i];
-		s[i] = temp;
-
-		oi = (s[i] + s[j]) % 256;
-		*out++ = s[oi];
-
-		outlen--;
-	}
-}
-
-uint8_t rc4_generate_keybyte(RC4_STATE *state)
-{
-	uint8_t out[1];
-	rc4_generate_keystream(state, 1, out);
-	return out[0];
-}