Home | History | Annotate | Download | only in evp
      1 /* crypto/evp/e_rc4.c */
      2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com)
      3  * All rights reserved.
      4  *
      5  * This package is an SSL implementation written
      6  * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 #include "cryptlib.h"
     61 
     62 #ifndef OPENSSL_NO_RC4
     63 
     64 #include <openssl/evp.h>
     65 #include "evp_locl.h"
     66 #include <openssl/objects.h>
     67 #include <openssl/rc4.h>
     68 
     69 /* FIXME: surely this is available elsewhere? */
     70 #define EVP_RC4_KEY_SIZE		16
     71 
     72 typedef struct
     73     {
     74     RC4_KEY ks;	/* working key */
     75     } EVP_RC4_KEY;
     76 
     77 #define data(ctx) ((EVP_RC4_KEY *)(ctx)->cipher_data)
     78 
     79 static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
     80 			const unsigned char *iv,int enc);
     81 static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
     82 		      const unsigned char *in, size_t inl);
     83 static const EVP_CIPHER r4_cipher=
     84 	{
     85 	NID_rc4,
     86 	1,EVP_RC4_KEY_SIZE,0,
     87 	EVP_CIPH_VARIABLE_LENGTH,
     88 	rc4_init_key,
     89 	rc4_cipher,
     90 	NULL,
     91 	sizeof(EVP_RC4_KEY),
     92 	NULL,
     93 	NULL,
     94 	NULL,
     95 	NULL
     96 	};
     97 
     98 static const EVP_CIPHER r4_40_cipher=
     99 	{
    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 *EVP_rc4(void)
    114 	{
    115 	return(&r4_cipher);
    116 	}
    117 
    118 const EVP_CIPHER *EVP_rc4_40(void)
    119 	{
    120 	return(&r4_40_cipher);
    121 	}
    122 
    123 static int rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    124 			const unsigned char *iv, int enc)
    125 	{
    126 	RC4_set_key(&data(ctx)->ks,EVP_CIPHER_CTX_key_length(ctx),
    127 		    key);
    128 	return 1;
    129 	}
    130 
    131 static int rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    132 		      const unsigned char *in, size_t inl)
    133 	{
    134 	RC4(&data(ctx)->ks,inl,in,out);
    135 	return 1;
    136 	}
    137 #endif
    138