1/*
2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10/*
11 * RC4 low level APIs are deprecated for public use, but still ok for internal
12 * use.
13 */
14#include "internal/deprecated.h"
15
16#include <stdio.h>
17#include "internal/cryptlib.h"
18
19#ifndef OPENSSL_NO_RC4
20
21# include <openssl/evp.h>
22# include <openssl/objects.h>
23# include <openssl/rc4.h>
24
25# include "crypto/evp.h"
26
27typedef struct {
28    RC4_KEY ks;                 /* working key */
29} EVP_RC4_KEY;
30
31# define data(ctx) ((EVP_RC4_KEY *)EVP_CIPHER_CTX_get_cipher_data(ctx))
32
33static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
34                        const unsigned char *iv, int enc);
35static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
36                      const unsigned char *in, size_t inl);
37static const EVP_CIPHER r4_cipher = {
38    NID_rc4,
39    1, EVP_RC4_KEY_SIZE, 0,
40    EVP_CIPH_VARIABLE_LENGTH,
41    EVP_ORIG_GLOBAL,
42    rc4_init_key,
43    rc4_cipher,
44    NULL,
45    sizeof(EVP_RC4_KEY),
46    NULL,
47    NULL,
48    NULL,
49    NULL
50};
51
52static const EVP_CIPHER r4_40_cipher = {
53    NID_rc4_40,
54    1, 5 /* 40 bit */ , 0,
55    EVP_CIPH_VARIABLE_LENGTH,
56    EVP_ORIG_GLOBAL,
57    rc4_init_key,
58    rc4_cipher,
59    NULL,
60    sizeof(EVP_RC4_KEY),
61    NULL,
62    NULL,
63    NULL,
64    NULL
65};
66
67const EVP_CIPHER *EVP_rc4(void)
68{
69    return &r4_cipher;
70}
71
72const EVP_CIPHER *EVP_rc4_40(void)
73{
74    return &r4_40_cipher;
75}
76
77static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
78                        const unsigned char *iv, int enc)
79{
80    int keylen;
81
82    if ((keylen = EVP_CIPHER_CTX_get_key_length(ctx)) <= 0)
83        return 0;
84    RC4_set_key(&data(ctx)->ks, keylen, key);
85    return 1;
86}
87
88static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
89                      const unsigned char *in, size_t inl)
90{
91    RC4(&data(ctx)->ks, inl, in, out);
92    return 1;
93}
94#endif
95