rc4.c revision 296341 
1/* crypto/rc4/rc4.c */
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#include <stdlib.h>
61#include <string.h>
62#include <openssl/rc4.h>
63#include <openssl/evp.h>
64
65char *usage[] = {
66    "usage: rc4 args\n",
67    "\n",
68    " -in arg         - input file - default stdin\n",
69    " -out arg        - output file - default stdout\n",
70    " -key key        - password\n",
71    NULL
72};
73
74int main(int argc, char *argv[])
75{
76    FILE *in = NULL, *out = NULL;
77    char *infile = NULL, *outfile = NULL, *keystr = NULL;
78    RC4_KEY key;
79    char buf[BUFSIZ];
80    int badops = 0, i;
81    char **pp;
82    unsigned char md[MD5_DIGEST_LENGTH];
83
84    argc--;
85    argv++;
86    while (argc >= 1) {
87        if (strcmp(*argv, "-in") == 0) {
88            if (--argc < 1)
89                goto bad;
90            infile = *(++argv);
91        } else if (strcmp(*argv, "-out") == 0) {
92            if (--argc < 1)
93                goto bad;
94            outfile = *(++argv);
95        } else if (strcmp(*argv, "-key") == 0) {
96            if (--argc < 1)
97                goto bad;
98            keystr = *(++argv);
99        } else {
100            fprintf(stderr, "unknown option %s\n", *argv);
101            badops = 1;
102            break;
103        }
104        argc--;
105        argv++;
106    }
107
108    if (badops) {
109 bad:
110        for (pp = usage; (*pp != NULL); pp++)
111            fprintf(stderr, "%s", *pp);
112        exit(1);
113    }
114
115    if (infile == NULL)
116        in = stdin;
117    else {
118        in = fopen(infile, "r");
119        if (in == NULL) {
120            perror("open");
121            exit(1);
122        }
123
124    }
125    if (outfile == NULL)
126        out = stdout;
127    else {
128        out = fopen(outfile, "w");
129        if (out == NULL) {
130            perror("open");
131            exit(1);
132        }
133    }
134
135#ifdef OPENSSL_SYS_MSDOS
136    /* This should set the file to binary mode. */
137    {
138# include <fcntl.h>
139        setmode(fileno(in), O_BINARY);
140        setmode(fileno(out), O_BINARY);
141    }
142#endif
143
144    if (keystr == NULL) {       /* get key */
145        i = EVP_read_pw_string(buf, BUFSIZ, "Enter RC4 password:", 0);
146        if (i != 0) {
147            OPENSSL_cleanse(buf, BUFSIZ);
148            fprintf(stderr, "bad password read\n");
149            exit(1);
150        }
151        keystr = buf;
152    }
153
154    EVP_Digest((unsigned char *)keystr, strlen(keystr), md, NULL, EVP_md5(),
155               NULL);
156    OPENSSL_cleanse(keystr, strlen(keystr));
157    RC4_set_key(&key, MD5_DIGEST_LENGTH, md);
158
159    for (;;) {
160        i = fread(buf, 1, BUFSIZ, in);
161        if (i == 0)
162            break;
163        if (i < 0) {
164            perror("read");
165            exit(1);
166        }
167        RC4(&key, (unsigned int)i, (unsigned char *)buf,
168            (unsigned char *)buf);
169        i = fwrite(buf, (unsigned int)i, 1, out);
170        if (i != 1) {
171            perror("write");
172            exit(1);
173        }
174    }
175    fclose(out);
176    fclose(in);
177    exit(0);
178    return (1);
179}
180