| /* crypto/des/ofb64enc.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 "des_locl.h" |
| |
| /* The input and output encrypted as though 64bit ofb mode is being |
| * used. The extra state information to record how much of the |
| * 64bit block we have used is contained in *num; |
| */ |
| void DES_ofb64_encrypt(register const unsigned char *in, |
| register unsigned char *out, long length, |
| DES_key_schedule *schedule, DES_cblock *ivec, int *num) |
| { |
| register DES_LONG v0,v1,t; |
| register int n= *num; |
| register long l=length; |
| DES_cblock d; |
| register unsigned char *dp; |
| DES_LONG ti[2]; |
| unsigned char *iv; |
| int save=0; |
| |
| iv = &(*ivec)[0]; |
| c2l(iv,v0); |
| c2l(iv,v1); |
| ti[0]=v0; |
| ti[1]=v1; |
| dp=d; |
| l2c(v0,dp); |
| l2c(v1,dp); |
| while (l--) |
| { |
| if (n == 0) |
| { |
| DES_encrypt1(ti,schedule,DES_ENCRYPT); |
| dp=d; |
| t=ti[0]; l2c(t,dp); |
| t=ti[1]; l2c(t,dp); |
| save++; |
| } |
| *(out++)= *(in++)^d[n]; |
| n=(n+1)&0x07; |
| } |
| if (save) |
| { |
| v0=ti[0]; |
| v1=ti[1]; |
| iv = &(*ivec)[0]; |
| l2c(v0,iv); |
| l2c(v1,iv); |
| } |
| t=v0=v1=ti[0]=ti[1]=0; |
| *num=n; |
| } |
| |