lib/libcrypto/evp/e_rc4.c

   1 /* $OpenBSD: e_rc4.c,v 1.14 2014/07/11 08:44:48 jsing Exp $ */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60
  61 #include <openssl/opensslconf.h>
  62
  63 #ifndef OPENSSL_NO_RC4
  64
  65 #include <openssl/evp.h>
  66 #include <openssl/objects.h>
  67 #include <openssl/rc4.h>
  68
  69 #include "evp_locl.h"
  70
  71 /* FIXME: surely this is available elsewhere? */
  72 #define EVP_RC4_KEY_SIZE                16
  73
  74 typedef struct {
  75     RC4_KEY ks; /* working key */
  76 } EVP_RC4_KEY;
  77
  78 #define data(ctx) ((EVP_RC4_KEY *)(ctx)->cipher_data)
  79
  80 static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
  81     const unsigned char *iv, int enc);
  82 static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
  83     const unsigned char *in, size_t inl);
  84
  85 static const EVP_CIPHER r4_cipher = {
  86         NID_rc4,
  87         1, EVP_RC4_KEY_SIZE, 0,
  88         EVP_CIPH_VARIABLE_LENGTH,
  89         rc4_init_key,
  90         rc4_cipher,
  91         NULL,
  92         sizeof(EVP_RC4_KEY),
  93         NULL,
  94         NULL,
  95         NULL,
  96         NULL
  97 };
  98
  99 static const EVP_CIPHER r4_40_cipher = {
 100         NID_rc4_40,
 101         1, 5 /* 40 bit */, 0,
 102         EVP_CIPH_VARIABLE_LENGTH,
 103         rc4_init_key,
 104         rc4_cipher,
 105         NULL,
 106         sizeof(EVP_RC4_KEY),
 107         NULL,
 108         NULL,
 109         NULL,
 110         NULL
 111 };
 112
 113 const EVP_CIPHER *
 114 EVP_rc4(void)
 115 {
 116         return (&r4_cipher);
 117 }
 118
 119 const EVP_CIPHER *
 120 EVP_rc4_40(void)
 121 {
 122         return (&r4_40_cipher);
 123 }
 124
 125 static int
 126 rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 127     const unsigned char *iv, int enc)
 128 {
 129         RC4_set_key(&data(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx), key);
 130         return 1;
 131 }
 132
 133 static int
 134 rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 135     const unsigned char *in, size_t inl)
 136 {
 137         RC4(&data(ctx)->ks, inl, in, out);
 138         return 1;
 139 }
 140 #endif