free NULL cleanup -- coda
[openssl.git] / crypto / rc4 / rc4.c
index c900b260554a394107031c708951a02d6d203d92..99082e891934f42e1426eaa3649b7ae080a93b80 100644 (file)
@@ -5,21 +5,21 @@
  * This package is an SSL implementation written
  * by Eric Young (eay@cryptsoft.com).
  * The implementation was written so as to conform with Netscapes SSL.
- * 
+ *
  * This library is free for commercial and non-commercial use as long as
  * the following conditions are aheared to.  The following conditions
  * apply to all code found in this distribution, be it the RC4, RSA,
  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  * included with this distribution is covered by the same copyright terms
  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- * 
+ *
  * Copyright remains Eric Young's, and as such any Copyright notices in
  * the code are not to be removed.
  * If this package is used in a product, Eric Young should be given attribution
  * as the author of the parts of the library used.
  * This can be in the form of a textual message at program startup or
  * in documentation (online or textual) provided with the package.
- * 
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *     Eric Young (eay@cryptsoft.com)"
  *    The word 'cryptographic' can be left out if the rouines from the library
  *    being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from 
+ * 4. If you include any Windows specific code (or a derivative thereof) from
  *    the apps directory (application code) you must include an acknowledgement:
  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
@@ -49,7 +49,7 @@
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
- * 
+ *
  * The licence and distribution terms for any publically available version or
  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  * copied and put under another distribution licence
 #include <openssl/rc4.h>
 #include <openssl/evp.h>
 
-char *usage[]={
-"usage: rc4 args\n",
-"\n",
-" -in arg         - input file - default stdin\n",
-" -out arg        - output file - default stdout\n",
-" -key key        - password\n",
-NULL
+char *usage[] = {
+    "usage: rc4 args\n",
+    "\n",
+    " -in arg         - input file - default stdin\n",
+    " -out arg        - output file - default stdout\n",
+    " -key key        - password\n",
+    NULL
 };
 
 int main(int argc, char *argv[])
-       {
-       FILE *in=NULL,*out=NULL;
-       char *infile=NULL,*outfile=NULL,*keystr=NULL;
-       RC4_KEY key;
-       char buf[BUFSIZ];
-       int badops=0,i;
-       char **pp;
-       unsigned char md[MD5_DIGEST_LENGTH];
+{
+    FILE *in = NULL, *out = NULL;
+    char *infile = NULL, *outfile = NULL, *keystr = NULL;
+    RC4_KEY key;
+    char buf[BUFSIZ];
+    int badops = 0, i;
+    char **pp;
+    unsigned char md[MD5_DIGEST_LENGTH];
+
+    argc--;
+    argv++;
+    while (argc >= 1) {
+        if (strcmp(*argv, "-in") == 0) {
+            if (--argc < 1)
+                goto bad;
+            infile = *(++argv);
+        } else if (strcmp(*argv, "-out") == 0) {
+            if (--argc < 1)
+                goto bad;
+            outfile = *(++argv);
+        } else if (strcmp(*argv, "-key") == 0) {
+            if (--argc < 1)
+                goto bad;
+            keystr = *(++argv);
+        } else {
+            fprintf(stderr, "unknown option %s\n", *argv);
+            badops = 1;
+            break;
+        }
+        argc--;
+        argv++;
+    }
 
-       argc--;
-       argv++;
-       while (argc >= 1)
-               {
-               if      (strcmp(*argv,"-in") == 0)
-                       {
-                       if (--argc < 1) goto bad;
-                       infile= *(++argv);
-                       }
-               else if (strcmp(*argv,"-out") == 0)
-                       {
-                       if (--argc < 1) goto bad;
-                       outfile= *(++argv);
-                       }
-               else if (strcmp(*argv,"-key") == 0)
-                       {
-                       if (--argc < 1) goto bad;
-                       keystr= *(++argv);
-                       }
-               else
-                       {
-                       fprintf(stderr,"unknown option %s\n",*argv);
-                       badops=1;
-                       break;
-                       }
-               argc--;
-               argv++;
-               }
+    if (badops) {
+ bad:
+        for (pp = usage; (*pp != NULL); pp++)
+            fprintf(stderr, "%s", *pp);
+        exit(1);
+    }
 
-       if (badops)
-               {
-bad:
-               for (pp=usage; (*pp != NULL); pp++)
-                       fprintf(stderr,"%s",*pp);
-               exit(1);
-               }
+    if (infile == NULL)
+        in = stdin;
+    else {
+        in = fopen(infile, "r");
+        if (in == NULL) {
+            perror("open");
+            exit(1);
+        }
 
-       if (infile == NULL)
-               in=stdin;
-       else
-               {
-               in=fopen(infile,"r");
-               if (in == NULL)
-                       {
-                       perror("open");
-                       exit(1);
-                       }
+    }
+    if (outfile == NULL)
+        out = stdout;
+    else {
+        out = fopen(outfile, "w");
+        if (out == NULL) {
+            perror("open");
+            exit(1);
+        }
+    }
 
-               }
-       if (outfile == NULL)
-               out=stdout;
-       else
-               {
-               out=fopen(outfile,"w");
-               if (out == NULL)
-                       {
-                       perror("open");
-                       exit(1);
-                       }
-               }
-               
 #ifdef OPENSSL_SYS_MSDOS
-       /* This should set the file to binary mode. */
-       {
-#include <fcntl.h>
-       setmode(fileno(in),O_BINARY);
-       setmode(fileno(out),O_BINARY);
-       }
+    /* This should set the file to binary mode. */
+    {
+# include <fcntl.h>
+        setmode(fileno(in), O_BINARY);
+        setmode(fileno(out), O_BINARY);
+    }
 #endif
 
-       if (keystr == NULL)
-               { /* get key */
-               i=EVP_read_pw_string(buf,BUFSIZ,"Enter RC4 password:",0);
-               if (i != 0)
-                       {
-                       OPENSSL_cleanse(buf,BUFSIZ);
-                       fprintf(stderr,"bad password read\n");
-                       exit(1);
-                       }
-               keystr=buf;
-               }
+    if (keystr == NULL) {       /* get key */
+        i = EVP_read_pw_string(buf, BUFSIZ, "Enter RC4 password:", 0);
+        if (i != 0) {
+            OPENSSL_cleanse(buf, BUFSIZ);
+            fprintf(stderr, "bad password read\n");
+            exit(1);
+        }
+        keystr = buf;
+    }
 
-       EVP_Digest((unsigned char *)keystr,strlen(keystr),md,NULL,EVP_md5(),NULL);
-       OPENSSL_cleanse(keystr,strlen(keystr));
-       RC4_set_key(&key,MD5_DIGEST_LENGTH,md);
-       
-       for(;;)
-               {
-               i=fread(buf,1,BUFSIZ,in);
-               if (i == 0) break;
-               if (i < 0)
-                       {
-                       perror("read");
-                       exit(1);
-                       }
-               RC4(&key,(unsigned int)i,(unsigned char *)buf,
-                       (unsigned char *)buf);
-               i=fwrite(buf,(unsigned int)i,1,out);
-               if (i != 1)
-                       {
-                       perror("write");
-                       exit(1);
-                       }
-               }
-       fclose(out);
-       fclose(in);
-       exit(0);
-       return(1);
-       }
+    EVP_Digest((unsigned char *)keystr, strlen(keystr), md, NULL, EVP_md5(),
+               NULL);
+    OPENSSL_cleanse(keystr, strlen(keystr));
+    RC4_set_key(&key, MD5_DIGEST_LENGTH, md);
 
+    for (;;) {
+        i = fread(buf, 1, BUFSIZ, in);
+        if (i == 0)
+            break;
+        if (i < 0) {
+            perror("read");
+            exit(1);
+        }
+        RC4(&key, (unsigned int)i, (unsigned char *)buf,
+            (unsigned char *)buf);
+        i = fwrite(buf, (unsigned int)i, 1, out);
+        if (i != 1) {
+            perror("write");
+            exit(1);
+        }
+    }
+    fclose(out);
+    fclose(in);
+    exit(0);
+    return (1);
+}