--- /dev/null
+/* crypto/des/enc_writ.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 <time.h>
+#include <stdio.h>
+#include "cryptlib.h"
+#include "des_locl.h"
+#include <openssl/rand.h>
+
+/*
+ * WARNINGS:
+ *
+ * - The data format used by DES_enc_write() and DES_enc_read()
+ * has a cryptographic weakness: When asked to write more
+ * than MAXWRITE bytes, DES_enc_write will split the data
+ * into several chunks that are all encrypted
+ * using the same IV. So don't use these functions unless you
+ * are sure you know what you do (in which case you might
+ * not want to use them anyway).
+ *
+ * - This code cannot handle non-blocking sockets.
+ */
+
+int DES_enc_write(int fd, const void *_buf, int len,
+ DES_key_schedule *sched, DES_cblock *iv)
+ {
+#if defined(OPENSSL_NO_POSIX_IO)
+ return (-1);
+#else
+#ifdef _LIBC
+ extern unsigned long time();
+ extern int write();
+#endif
+ const unsigned char *buf=_buf;
+ long rnum;
+ int i,j,k,outnum;
+ static unsigned char *outbuf=NULL;
+ unsigned char shortbuf[8];
+ unsigned char *p;
+ const unsigned char *cp;
+ static int start=1;
+
+ if (outbuf == NULL)
+ {
+ outbuf=OPENSSL_malloc(BSIZE+HDRSIZE);
+ if (outbuf == NULL) return(-1);
+ }
+ /* If we are sending less than 8 bytes, the same char will look
+ * the same if we don't pad it out with random bytes */
+ if (start)
+ {
+ start=0;
+ }
+
+ /* lets recurse if we want to send the data in small chunks */
+ if (len > MAXWRITE)
+ {
+ j=0;
+ for (i=0; i<len; i+=k)
+ {
+ k=DES_enc_write(fd,&(buf[i]),
+ ((len-i) > MAXWRITE)?MAXWRITE:(len-i),sched,iv);
+ if (k < 0)
+ return(k);
+ else
+ j+=k;
+ }
+ return(j);
+ }
+
+ /* write length first */
+ p=outbuf;
+ l2n(len,p);
+
+ /* pad short strings */
+ if (len < 8)
+ {
+ cp=shortbuf;
+ memcpy(shortbuf,buf,len);
+ RAND_pseudo_bytes(shortbuf+len, 8-len);
+ rnum=8;
+ }
+ else
+ {
+ cp=buf;
+ rnum=((len+7)/8*8); /* round up to nearest eight */
+ }
+
+ if (DES_rw_mode & DES_PCBC_MODE)
+ DES_pcbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv,
+ DES_ENCRYPT);
+ else
+ DES_cbc_encrypt(cp,&(outbuf[HDRSIZE]),(len<8)?8:len,sched,iv,
+ DES_ENCRYPT);
+
+ /* output */
+ outnum=rnum+HDRSIZE;
+
+ for (j=0; j<outnum; j+=i)
+ {
+ /* eay 26/08/92 I was not doing writing from where we
+ * got up to. */
+#ifndef _WIN32
+ i=write(fd,(void *)&(outbuf[j]),outnum-j);
+#else
+ i=_write(fd,(void *)&(outbuf[j]),outnum-j);
+#endif
+ if (i == -1)
+ {
+#ifdef EINTR
+ if (errno == EINTR)
+ i=0;
+ else
+#endif
+ /* This is really a bad error - very bad
+ * It will stuff-up both ends. */
+ return(-1);
+ }
+ }
+
+ return(len);
+#endif /* OPENSSL_NO_POSIX_IO */
+ }
projects / cassiopeia.git / blobdiff