227 lines
6.3 KiB
C
227 lines
6.3 KiB
C
/* crypto/rand/randfile.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/e_os.h>
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#include <openssl/crypto.h>
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#include <openssl/rand.h>
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#ifdef OPENSSL_SYS_VMS
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#include <unixio.h>
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#endif
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#ifndef NO_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef MAC_OS_pre_X
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# include <stat.h>
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#else
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# include <sys/stat.h>
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#endif
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#undef BUFSIZE
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#define BUFSIZE 1024
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#define RAND_DATA 1024
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/* #define RFILE ".rnd" - defined in ../../e_os.h */
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/* Note that these functions are intended for seed files only.
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* Entropy devices and EGD sockets are handled in rand_unix.c */
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int RAND_load_file(const char *file, long bytes)
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{
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/* If bytes >= 0, read up to 'bytes' bytes.
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* if bytes == -1, read complete file. */
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MS_STATIC unsigned char buf[BUFSIZE];
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struct stat sb;
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int i,ret=0,n;
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FILE *in;
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if (file == NULL) return(0);
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i=stat(file,&sb);
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/* If the state fails, put some crap in anyway */
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RAND_add(&sb,sizeof(sb),0);
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if (i < 0) return(0);
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if (bytes == 0) return(ret);
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in=fopen(file,"rb");
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if (in == NULL) goto err;
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for (;;)
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{
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if (bytes > 0)
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n = (bytes < BUFSIZE)?(int)bytes:BUFSIZE;
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else
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n = BUFSIZE;
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i=fread(buf,1,n,in);
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if (i <= 0) break;
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/* even if n != i, use the full array */
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RAND_add(buf,n,i);
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ret+=i;
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if (bytes > 0)
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{
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bytes-=n;
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if (bytes <= 0) break;
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}
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}
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fclose(in);
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memset(buf,0,BUFSIZE);
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err:
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return(ret);
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}
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int RAND_write_file(const char *file)
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{
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unsigned char buf[BUFSIZE];
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int i,ret=0,rand_err=0;
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FILE *out = NULL;
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int n;
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#if defined(O_CREAT) && !defined(OPENSSL_SYS_WIN32)
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/* For some reason Win32 can't write to files created this way */
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/* chmod(..., 0600) is too late to protect the file,
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* permissions should be restrictive from the start */
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int fd = open(file, O_CREAT, 0600);
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if (fd != -1)
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out = fdopen(fd, "wb");
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#endif
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if (out == NULL)
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out = fopen(file,"wb");
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if (out == NULL) goto err;
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#ifndef NO_CHMOD
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chmod(file,0600);
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#endif
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n=RAND_DATA;
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for (;;)
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{
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i=(n > BUFSIZE)?BUFSIZE:n;
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n-=BUFSIZE;
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if (RAND_bytes(buf,i) <= 0)
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rand_err=1;
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i=fwrite(buf,1,i,out);
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if (i <= 0)
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{
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ret=0;
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break;
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}
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ret+=i;
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if (n <= 0) break;
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}
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#ifdef OPENSSL_SYS_VMS
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/* Try to delete older versions of the file, until there aren't
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any */
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{
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char *tmpf;
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tmpf = OPENSSL_malloc(strlen(file) + 4); /* to add ";-1" and a nul */
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if (tmpf)
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{
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strcpy(tmpf, file);
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strcat(tmpf, ";-1");
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while(delete(tmpf) == 0)
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;
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rename(file,";1"); /* Make sure it's version 1, or we
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will reach the limit (32767) at
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some point... */
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}
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}
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#endif /* OPENSSL_SYS_VMS */
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fclose(out);
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memset(buf,0,BUFSIZE);
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err:
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return (rand_err ? -1 : ret);
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}
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const char *RAND_file_name(char *buf, int size)
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{
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char *s=NULL;
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char *ret=NULL;
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if (OPENSSL_issetugid() == 0)
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s=getenv("RANDFILE");
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if (s != NULL)
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{
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strncpy(buf,s,size-1);
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buf[size-1]='\0';
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ret=buf;
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}
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else
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{
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if (OPENSSL_issetugid() == 0)
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s=getenv("HOME");
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if (s != NULL && (strlen(s)+strlen(RFILE)+2 < size))
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{
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strcpy(buf,s);
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#ifndef OPENSSL_SYS_VMS
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strcat(buf,"/");
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#endif
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strcat(buf,RFILE);
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ret=buf;
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}
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else
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buf[0] = '\0'; /* no file name */
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}
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return(ret);
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}
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