crypto/evp/e_rc4.c

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12
  13 #ifndef OPENSSL_NO_RC4
  14
  15 # include <openssl/evp.h>
  16 # include <openssl/objects.h>
  17 # include <openssl/rc4.h>
  18
  19 # include "internal/evp_int.h"
  20
  21 /* FIXME: surely this is available elsewhere? */
  22 # define EVP_RC4_KEY_SIZE                16
  23
  24 typedef struct {
  25     RC4_KEY ks;                 /* working key */
  26 } EVP_RC4_KEY;
  27
  28 # define data(ctx) ((EVP_RC4_KEY *)EVP_CIPHER_CTX_get_cipher_data(ctx))
  29
  30 static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  31                         const unsigned char *iv, int enc);
  32 static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  33                       const unsigned char *in, size_t inl);
  34 static const EVP_CIPHER r4_cipher = {
  35     NID_rc4,
  36     1, EVP_RC4_KEY_SIZE, 0,
  37     EVP_CIPH_VARIABLE_LENGTH,
  38     rc4_init_key,
  39     rc4_cipher,
  40     NULL,
  41     sizeof(EVP_RC4_KEY),
  42     NULL,
  43     NULL,
  44     NULL,
  45     NULL
  46 };
  47
  48 static const EVP_CIPHER r4_40_cipher = {
  49     NID_rc4_40,
  50     1, 5 /* 40 bit */ , 0,
  51     EVP_CIPH_VARIABLE_LENGTH,
  52     rc4_init_key,
  53     rc4_cipher,
  54     NULL,
  55     sizeof(EVP_RC4_KEY),
  56     NULL,
  57     NULL,
  58     NULL,
  59     NULL
  60 };
  61
  62 const EVP_CIPHER *EVP_rc4(void)
  63 {
  64     return (&r4_cipher);
  65 }
  66
  67 const EVP_CIPHER *EVP_rc4_40(void)
  68 {
  69     return (&r4_40_cipher);
  70 }
  71
  72 static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  73                         const unsigned char *iv, int enc)
  74 {
  75     RC4_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx), key);
  76     return 1;
  77 }
  78
  79 static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  80                       const unsigned char *in, size_t inl)
  81 {
  82     RC4(&data(ctx)->ks, inl, in, out);
  83     return 1;
  84 }
  85 #endif