diff options
Diffstat (limited to 'openssl/crypto/des/enc_writ.c')
| -rw-r--r-- | openssl/crypto/des/enc_writ.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/openssl/crypto/des/enc_writ.c b/openssl/crypto/des/enc_writ.c new file mode 100644 index 000000000..c2f032c9a --- /dev/null +++ b/openssl/crypto/des/enc_writ.c @@ -0,0 +1,175 @@ +/* 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) + { +#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); + } |