openssl/crypto/rand/randfile.c

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/* crypto/rand/randfile.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* 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:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* 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
* 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
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* 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
* [including the GNU Public Licence.]
*/
#include <errno.h>
#include <stdio.h>
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#include <stdlib.h>
#include <string.h>
#include "openssl/e_os.h"
#ifdef VMS
#include <unixio.h>
#endif
#ifndef NO_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef MAC_OS_pre_X
# include <stat.h>
#else
# include <sys/stat.h>
#endif
#include <openssl/crypto.h>
#include <openssl/rand.h>
#undef BUFSIZE
#define BUFSIZE 1024
#define RAND_DATA 1024
/* #define RFILE ".rnd" - defined in ../../e_os.h */
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int RAND_load_file(const char *file, long bytes)
{
/* If bytes >= 0, read up to 'bytes' bytes.
* if bytes == -1, read complete file. */
MS_STATIC unsigned char buf[BUFSIZE];
struct stat sb;
int i,ret=0,n;
FILE *in;
if (file == NULL) return(0);
i=stat(file,&sb);
/* If the state fails, put some crap in anyway */
RAND_add(&sb,sizeof(sb),0);
if (i < 0) return(0);
if (bytes == 0) return(ret);
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in=fopen(file,"rb");
if (in == NULL) goto err;
for (;;)
{
if (bytes > 0)
n = (bytes < BUFSIZE)?(int)bytes:BUFSIZE;
else
n = BUFSIZE;
i=fread(buf,1,n,in);
if (i <= 0) break;
/* even if n != i, use the full array */
RAND_add(buf,n,i);
ret+=i;
if (bytes > 0)
{
bytes-=n;
if (bytes == 0) break;
}
}
fclose(in);
memset(buf,0,BUFSIZE);
err:
return(ret);
}
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int RAND_write_file(const char *file)
{
unsigned char buf[BUFSIZE];
int i,ret=0,err=0;
FILE *out = NULL;
int n;
#if defined(O_CREAT) && !defined(WIN32)
/* For some reason Win32 can't write to files created this way */
/* chmod(..., 0600) is too late to protect the file,
* permissions should be restrictive from the start */
int fd = open(file, O_CREAT, 0600);
if (fd != -1)
out = fdopen(fd, "wb");
#endif
if (out == NULL)
out = fopen(file,"wb");
if (out == NULL) goto err;
#ifndef NO_CHMOD
chmod(file,0600);
#endif
n=RAND_DATA;
for (;;)
{
i=(n > BUFSIZE)?BUFSIZE:n;
n-=BUFSIZE;
if (RAND_bytes(buf,i) <= 0)
err=1;
i=fwrite(buf,1,i,out);
if (i <= 0)
{
ret=0;
break;
}
ret+=i;
if (n <= 0) break;
}
#ifdef VMS
/* Try to delete older versions of the file, until there aren't
any */
{
char *tmpf;
tmpf = OPENSSL_malloc(strlen(file) + 4); /* to add ";-1" and a nul */
if (tmpf)
{
strcpy(tmpf, file);
strcat(tmpf, ";-1");
while(delete(tmpf) == 0)
;
rename(file,";1"); /* Make sure it's version 1, or we
will reach the limit (32767) at
some point... */
}
}
#endif /* VMS */
fclose(out);
memset(buf,0,BUFSIZE);
err:
return(err ? -1 : ret);
}
const char *RAND_file_name(char *buf, int size)
{
char *s;
char *ret=NULL;
s=getenv("RANDFILE");
if (s != NULL)
{
strncpy(buf,s,size-1);
buf[size-1]='\0';
ret=buf;
}
else
{
s=getenv("HOME");
if (s == NULL) return(RFILE);
if (((int)(strlen(s)+strlen(RFILE)+2)) > size)
return(RFILE);
strcpy(buf,s);
#ifndef VMS
strcat(buf,"/");
#endif
strcat(buf,RFILE);
ret=buf;
}
return(ret);
}