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Diffstat (limited to 'thirdparty/openssl/crypto/des/enc_read.c')
| -rw-r--r-- | thirdparty/openssl/crypto/des/enc_read.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/thirdparty/openssl/crypto/des/enc_read.c b/thirdparty/openssl/crypto/des/enc_read.c new file mode 100644 index 0000000000..fcb66541bd --- /dev/null +++ b/thirdparty/openssl/crypto/des/enc_read.c @@ -0,0 +1,235 @@ +/* crypto/des/enc_read.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 <stdio.h> +#include <errno.h> +#include "cryptlib.h" +#include "des_locl.h" + +/* This has some uglies in it but it works - even over sockets. */ +/* + * extern int errno; + */ +OPENSSL_IMPLEMENT_GLOBAL(int, DES_rw_mode, DES_PCBC_MODE) + +/*- + * 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. + * + * - This function uses an internal state and thus cannot be + * used on multiple files. + */ +int DES_enc_read(int fd, void *buf, int len, DES_key_schedule *sched, + DES_cblock *iv) +{ +#if defined(OPENSSL_NO_POSIX_IO) + return (0); +#else + /* data to be unencrypted */ + int net_num = 0; + static unsigned char *net = NULL; + /* + * extra unencrypted data for when a block of 100 comes in but is + * des_read one byte at a time. + */ + static unsigned char *unnet = NULL; + static int unnet_start = 0; + static int unnet_left = 0; + static unsigned char *tmpbuf = NULL; + int i; + long num = 0, rnum; + unsigned char *p; + + if (tmpbuf == NULL) { + tmpbuf = OPENSSL_malloc(BSIZE); + if (tmpbuf == NULL) + return (-1); + } + if (net == NULL) { + net = OPENSSL_malloc(BSIZE); + if (net == NULL) + return (-1); + } + if (unnet == NULL) { + unnet = OPENSSL_malloc(BSIZE); + if (unnet == NULL) + return (-1); + } + /* left over data from last decrypt */ + if (unnet_left != 0) { + if (unnet_left < len) { + /* + * we still still need more data but will return with the number + * of bytes we have - should always check the return value + */ + memcpy(buf, &(unnet[unnet_start]), unnet_left); + /* + * eay 26/08/92 I had the next 2 lines reversed :-( + */ + i = unnet_left; + unnet_start = unnet_left = 0; + } else { + memcpy(buf, &(unnet[unnet_start]), len); + unnet_start += len; + unnet_left -= len; + i = len; + } + return (i); + } + + /* We need to get more data. */ + if (len > MAXWRITE) + len = MAXWRITE; + + /* first - get the length */ + while (net_num < HDRSIZE) { +# ifndef OPENSSL_SYS_WIN32 + i = read(fd, (void *)&(net[net_num]), HDRSIZE - net_num); +# else + i = _read(fd, (void *)&(net[net_num]), HDRSIZE - net_num); +# endif +# ifdef EINTR + if ((i == -1) && (errno == EINTR)) + continue; +# endif + if (i <= 0) + return (0); + net_num += i; + } + + /* we now have at net_num bytes in net */ + p = net; + /* num=0; */ + n2l(p, num); + /* + * num should be rounded up to the next group of eight we make sure that + * we have read a multiple of 8 bytes from the net. + */ + if ((num > MAXWRITE) || (num < 0)) /* error */ + return (-1); + rnum = (num < 8) ? 8 : ((num + 7) / 8 * 8); + + net_num = 0; + while (net_num < rnum) { +# ifndef OPENSSL_SYS_WIN32 + i = read(fd, (void *)&(net[net_num]), rnum - net_num); +# else + i = _read(fd, (void *)&(net[net_num]), rnum - net_num); +# endif +# ifdef EINTR + if ((i == -1) && (errno == EINTR)) + continue; +# endif + if (i <= 0) + return (0); + net_num += i; + } + + /* Check if there will be data left over. */ + if (len < num) { + if (DES_rw_mode & DES_PCBC_MODE) + DES_pcbc_encrypt(net, unnet, num, sched, iv, DES_DECRYPT); + else + DES_cbc_encrypt(net, unnet, num, sched, iv, DES_DECRYPT); + memcpy(buf, unnet, len); + unnet_start = len; + unnet_left = num - len; + + /* + * The following line is done because we return num as the number of + * bytes read. + */ + num = len; + } else { + /*- + * >output is a multiple of 8 byes, if len < rnum + * >we must be careful. The user must be aware that this + * >routine will write more bytes than he asked for. + * >The length of the buffer must be correct. + * FIXED - Should be ok now 18-9-90 - eay */ + if (len < rnum) { + + if (DES_rw_mode & DES_PCBC_MODE) + DES_pcbc_encrypt(net, tmpbuf, num, sched, iv, DES_DECRYPT); + else + DES_cbc_encrypt(net, tmpbuf, num, sched, iv, DES_DECRYPT); + + /* + * eay 26/08/92 fix a bug that returned more bytes than you asked + * for (returned len bytes :-( + */ + memcpy(buf, tmpbuf, num); + } else { + if (DES_rw_mode & DES_PCBC_MODE) + DES_pcbc_encrypt(net, buf, num, sched, iv, DES_DECRYPT); + else + DES_cbc_encrypt(net, buf, num, sched, iv, DES_DECRYPT); + } + } + return num; +#endif /* OPENSSL_NO_POSIX_IO */ +} |