crypto/evp/e_rc4.c

   1 /*
   2  * Copyright 1995-2016 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 #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 typedef struct {
  22     RC4_KEY ks;                 /* working key */
  23 } EVP_RC4_KEY;
  24
  25 # define data(ctx) ((EVP_RC4_KEY *)EVP_CIPHER_CTX_get_cipher_data(ctx))
  26
  27 static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  28                         const unsigned char *iv, int enc);
  29 static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  30                       const unsigned char *in, size_t inl);
  31 static const EVP_CIPHER r4_cipher = {
  32     NID_rc4,
  33     1, EVP_RC4_KEY_SIZE, 0,
  34     EVP_CIPH_VARIABLE_LENGTH,
  35     rc4_init_key,
  36     rc4_cipher,
  37     NULL,
  38     sizeof(EVP_RC4_KEY),
  39     NULL,
  40     NULL,
  41     NULL,
  42     NULL
  43 };
  44
  45 static const EVP_CIPHER r4_40_cipher = {
  46     NID_rc4_40,
  47     1, 5 /* 40 bit */ , 0,
  48     EVP_CIPH_VARIABLE_LENGTH,
  49     rc4_init_key,
  50     rc4_cipher,
  51     NULL,
  52     sizeof(EVP_RC4_KEY),
  53     NULL,
  54     NULL,
  55     NULL,
  56     NULL
  57 };
  58
  59 const EVP_CIPHER *EVP_rc4(void)
  60 {
  61     return &r4_cipher;
  62 }
  63
  64 const EVP_CIPHER *EVP_rc4_40(void)
  65 {
  66     return &r4_40_cipher;
  67 }
  68
  69 static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  70                         const unsigned char *iv, int enc)
  71 {
  72     RC4_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx), key);
  73     return 1;
  74 }
  75
  76 static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  77                       const unsigned char *in, size_t inl)
  78 {
  79     RC4(&data(ctx)->ks, inl, in, out);
  80     return 1;
  81 }
  82 #endif