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Remove RC4

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This commit is contained in:
Zhi Guan
2023-12-13 20:16:05 +08:00
parent 908ece9d0a
commit 687ecb9f49
3 changed files with 2 additions and 125 deletions
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4
CMakeLists.txt
View File

@@ -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()

40
include/gmssl/rc4.h
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@@ -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

83
src/rc4.c
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@@ -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];
}