xref: /openssl/crypto/evp/e_rc4.c (revision ed576acd)
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 
27 typedef 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 
33 static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
34                         const unsigned char *iv, int enc);
35 static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
36                       const unsigned char *in, size_t inl);
37 static 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 
52 static 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 
EVP_rc4(void)67 const EVP_CIPHER *EVP_rc4(void)
68 {
69     return &r4_cipher;
70 }
71 
EVP_rc4_40(void)72 const EVP_CIPHER *EVP_rc4_40(void)
73 {
74     return &r4_40_cipher;
75 }
76 
rc4_init_key(EVP_CIPHER_CTX * ctx,const unsigned char * key,const unsigned char * iv,int enc)77 static 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 
rc4_cipher(EVP_CIPHER_CTX * ctx,unsigned char * out,const unsigned char * in,size_t inl)88 static 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