diff options
Diffstat (limited to 'crypto/des/enc_read.c')
| -rw-r--r-- | crypto/des/enc_read.c | 320 |
1 files changed, 157 insertions, 163 deletions
diff --git a/crypto/des/enc_read.c b/crypto/des/enc_read.c index 74bf51b72e..ed44abcaea 100644 --- a/crypto/des/enc_read.c +++ b/crypto/des/enc_read.c @@ -5,21 +5,21 @@ * 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: @@ -34,10 +34,10 @@ * 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 + * 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 @@ -49,7 +49,7 @@ * 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 @@ -62,9 +62,10 @@ #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) - +/* + * extern int errno; + */ +OPENSSL_IMPLEMENT_GLOBAL(int, DES_rw_mode, DES_PCBC_MODE) /*- * WARNINGS: @@ -82,160 +83,153 @@ OPENSSL_IMPLEMENT_GLOBAL(int,DES_rw_mode,DES_PCBC_MODE) * - 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) - { + DES_cblock *iv) +{ #if defined(OPENSSL_NO_POSIX_IO) - return(0); + 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 */ - } - + /* 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 */ +} |