crypto/evp/e_rc4.c

   1 /*
   2  * Copyright 1995-2020 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     rc4_init_key,
  42     rc4_cipher,
  43     NULL,
  44     sizeof(EVP_RC4_KEY),
  45     NULL,
  46     NULL,
  47     NULL,
  48     NULL
  49 };
  50
  51 static const EVP_CIPHER r4_40_cipher = {
  52     NID_rc4_40,
  53     1, 5 /* 40 bit */ , 0,
  54     EVP_CIPH_VARIABLE_LENGTH,
  55     rc4_init_key,
  56     rc4_cipher,
  57     NULL,
  58     sizeof(EVP_RC4_KEY),
  59     NULL,
  60     NULL,
  61     NULL,
  62     NULL
  63 };
  64
  65 const EVP_CIPHER *EVP_rc4(void)
  66 {
  67     return &r4_cipher;
  68 }
  69
  70 const EVP_CIPHER *EVP_rc4_40(void)
  71 {
  72     return &r4_40_cipher;
  73 }
  74
  75 static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  76                         const unsigned char *iv, int enc)
  77 {
  78     int keylen;
  79
  80     if ((keylen = EVP_CIPHER_CTX_key_length(ctx)) <= 0)
  81         return 0;
  82     RC4_set_key(&data(ctx)->ks, keylen, key);
  83     return 1;
  84 }
  85
  86 static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  87                       const unsigned char *in, size_t inl)
  88 {
  89     RC4(&data(ctx)->ks, inl, in, out);
  90     return 1;
  91 }
  92 #endif