| /* crypto/des/cfb64ede.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" |
| #include "e_os.h" |
| |
| /* The input and output encrypted as though 64bit cfb 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_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out, |
| long length, DES_key_schedule *ks1, |
| DES_key_schedule *ks2, DES_key_schedule *ks3, |
| DES_cblock *ivec, int *num, int enc) |
| { |
| register DES_LONG v0,v1; |
| register long l=length; |
| register int n= *num; |
| DES_LONG ti[2]; |
| unsigned char *iv,c,cc; |
| |
| iv=&(*ivec)[0]; |
| if (enc) |
| { |
| while (l--) |
| { |
| if (n == 0) |
| { |
| c2l(iv,v0); |
| c2l(iv,v1); |
| |
| ti[0]=v0; |
| ti[1]=v1; |
| DES_encrypt3(ti,ks1,ks2,ks3); |
| v0=ti[0]; |
| v1=ti[1]; |
| |
| iv = &(*ivec)[0]; |
| l2c(v0,iv); |
| l2c(v1,iv); |
| iv = &(*ivec)[0]; |
| } |
| c= *(in++)^iv[n]; |
| *(out++)=c; |
| iv[n]=c; |
| n=(n+1)&0x07; |
| } |
| } |
| else |
| { |
| while (l--) |
| { |
| if (n == 0) |
| { |
| c2l(iv,v0); |
| c2l(iv,v1); |
| |
| ti[0]=v0; |
| ti[1]=v1; |
| DES_encrypt3(ti,ks1,ks2,ks3); |
| v0=ti[0]; |
| v1=ti[1]; |
| |
| iv = &(*ivec)[0]; |
| l2c(v0,iv); |
| l2c(v1,iv); |
| iv = &(*ivec)[0]; |
| } |
| cc= *(in++); |
| c=iv[n]; |
| iv[n]=cc; |
| *(out++)=c^cc; |
| n=(n+1)&0x07; |
| } |
| } |
| v0=v1=ti[0]=ti[1]=c=cc=0; |
| *num=n; |
| } |
| |
| #ifdef undef /* MACRO */ |
| void DES_ede2_cfb64_encrypt(unsigned char *in, unsigned char *out, long length, |
| DES_key_schedule ks1, DES_key_schedule ks2, DES_cblock (*ivec), |
| int *num, int enc) |
| { |
| DES_ede3_cfb64_encrypt(in,out,length,ks1,ks2,ks1,ivec,num,enc); |
| } |
| #endif |
| |
| /* This is compatible with the single key CFB-r for DES, even thought that's |
| * not what EVP needs. |
| */ |
| |
| void DES_ede3_cfb_encrypt(const unsigned char *in,unsigned char *out, |
| int numbits,long length,DES_key_schedule *ks1, |
| DES_key_schedule *ks2,DES_key_schedule *ks3, |
| DES_cblock *ivec,int enc) |
| { |
| register DES_LONG d0,d1,v0,v1; |
| register unsigned long l=length,n=((unsigned int)numbits+7)/8; |
| register int num=numbits,i; |
| DES_LONG ti[2]; |
| unsigned char *iv; |
| unsigned char ovec[16]; |
| |
| if (num > 64) return; |
| iv = &(*ivec)[0]; |
| c2l(iv,v0); |
| c2l(iv,v1); |
| if (enc) |
| { |
| while (l >= n) |
| { |
| l-=n; |
| ti[0]=v0; |
| ti[1]=v1; |
| DES_encrypt3(ti,ks1,ks2,ks3); |
| c2ln(in,d0,d1,n); |
| in+=n; |
| d0^=ti[0]; |
| d1^=ti[1]; |
| l2cn(d0,d1,out,n); |
| out+=n; |
| /* 30-08-94 - eay - changed because l>>32 and |
| * l<<32 are bad under gcc :-( */ |
| if (num == 32) |
| { v0=v1; v1=d0; } |
| else if (num == 64) |
| { v0=d0; v1=d1; } |
| else |
| { |
| iv=&ovec[0]; |
| l2c(v0,iv); |
| l2c(v1,iv); |
| l2c(d0,iv); |
| l2c(d1,iv); |
| /* shift ovec left most of the bits... */ |
| memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0)); |
| /* now the remaining bits */ |
| if(num%8 != 0) |
| for(i=0 ; i < 8 ; ++i) |
| { |
| ovec[i]<<=num%8; |
| ovec[i]|=ovec[i+1]>>(8-num%8); |
| } |
| iv=&ovec[0]; |
| c2l(iv,v0); |
| c2l(iv,v1); |
| } |
| } |
| } |
| else |
| { |
| while (l >= n) |
| { |
| l-=n; |
| ti[0]=v0; |
| ti[1]=v1; |
| DES_encrypt3(ti,ks1,ks2,ks3); |
| c2ln(in,d0,d1,n); |
| in+=n; |
| /* 30-08-94 - eay - changed because l>>32 and |
| * l<<32 are bad under gcc :-( */ |
| if (num == 32) |
| { v0=v1; v1=d0; } |
| else if (num == 64) |
| { v0=d0; v1=d1; } |
| else |
| { |
| iv=&ovec[0]; |
| l2c(v0,iv); |
| l2c(v1,iv); |
| l2c(d0,iv); |
| l2c(d1,iv); |
| /* shift ovec left most of the bits... */ |
| memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0)); |
| /* now the remaining bits */ |
| if(num%8 != 0) |
| for(i=0 ; i < 8 ; ++i) |
| { |
| ovec[i]<<=num%8; |
| ovec[i]|=ovec[i+1]>>(8-num%8); |
| } |
| iv=&ovec[0]; |
| c2l(iv,v0); |
| c2l(iv,v1); |
| } |
| d0^=ti[0]; |
| d1^=ti[1]; |
| l2cn(d0,d1,out,n); |
| out+=n; |
| } |
| } |
| iv = &(*ivec)[0]; |
| l2c(v0,iv); |
| l2c(v1,iv); |
| v0=v1=d0=d1=ti[0]=ti[1]=0; |
| } |
| |