You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
249 lines
8.6 KiB
249 lines
8.6 KiB
/* 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; |
|
}
|
|
|