| /* crypto/des/cfb_enc.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 "e_os.h" |
| #include "des_locl.h" |
| #include <openssl/opensslconf.h> |
| #if !defined(OPENSSL_SYS_STARBOARD) |
| #include <assert.h> |
| #endif // !defined(OPENSSL_SYS_STARBOARD) |
| |
| /* |
| * The input and output are loaded in multiples of 8 bits. What this means is |
| * that if you hame numbits=12 and length=2 the first 12 bits will be |
| * retrieved from the first byte and half the second. The second 12 bits |
| * will come from the 3rd and half the 4th byte. |
| */ |
| /* |
| * Until Aug 1 2003 this function did not correctly implement CFB-r, so it |
| * will not be compatible with any encryption prior to that date. Ben. |
| */ |
| void DES_cfb_encrypt(const unsigned char *in, unsigned char *out, int numbits, |
| long length, DES_key_schedule *schedule, |
| DES_cblock *ivec, int enc) |
| { |
| register DES_LONG d0, d1, v0, v1; |
| register unsigned long l = length; |
| register int num = numbits / 8, n = (numbits + 7) / 8, i, rem = |
| numbits % 8; |
| DES_LONG ti[2]; |
| unsigned char *iv; |
| #ifndef L_ENDIAN |
| unsigned char ovec[16]; |
| #else |
| unsigned int sh[4]; |
| unsigned char *ovec = (unsigned char *)sh; |
| |
| /* I kind of count that compiler optimizes away this assertioni, */ |
| OPENSSL_port_assert(sizeof(sh[0]) == 4); /* as this holds true for all, */ |
| /* but 16-bit platforms... */ |
| |
| #endif |
| |
| if (numbits <= 0 || numbits > 64) |
| return; |
| iv = &(*ivec)[0]; |
| c2l(iv, v0); |
| c2l(iv, v1); |
| if (enc) { |
| while (l >= (unsigned long)n) { |
| l -= n; |
| ti[0] = v0; |
| ti[1] = v1; |
| DES_encrypt1((DES_LONG *)ti, schedule, DES_ENCRYPT); |
| 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 (numbits == 32) { |
| v0 = v1; |
| v1 = d0; |
| } else if (numbits == 64) { |
| v0 = d0; |
| v1 = d1; |
| } else { |
| #ifndef L_ENDIAN |
| iv = &ovec[0]; |
| l2c(v0, iv); |
| l2c(v1, iv); |
| l2c(d0, iv); |
| l2c(d1, iv); |
| #else |
| sh[0] = v0, sh[1] = v1, sh[2] = d0, sh[3] = d1; |
| #endif |
| if (rem == 0) |
| OPENSSL_port_memmove(ovec, ovec + num, 8); |
| else |
| for (i = 0; i < 8; ++i) |
| ovec[i] = ovec[i + num] << rem | |
| ovec[i + num + 1] >> (8 - rem); |
| #ifdef L_ENDIAN |
| v0 = sh[0], v1 = sh[1]; |
| #else |
| iv = &ovec[0]; |
| c2l(iv, v0); |
| c2l(iv, v1); |
| #endif |
| } |
| } |
| } else { |
| while (l >= (unsigned long)n) { |
| l -= n; |
| ti[0] = v0; |
| ti[1] = v1; |
| DES_encrypt1((DES_LONG *)ti, schedule, DES_ENCRYPT); |
| c2ln(in, d0, d1, n); |
| in += n; |
| /* |
| * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under |
| * gcc :-( |
| */ |
| if (numbits == 32) { |
| v0 = v1; |
| v1 = d0; |
| } else if (numbits == 64) { |
| v0 = d0; |
| v1 = d1; |
| } else { |
| #ifndef L_ENDIAN |
| iv = &ovec[0]; |
| l2c(v0, iv); |
| l2c(v1, iv); |
| l2c(d0, iv); |
| l2c(d1, iv); |
| #else |
| sh[0] = v0, sh[1] = v1, sh[2] = d0, sh[3] = d1; |
| #endif |
| if (rem == 0) |
| OPENSSL_port_memmove(ovec, ovec + num, 8); |
| else |
| for (i = 0; i < 8; ++i) |
| ovec[i] = ovec[i + num] << rem | |
| ovec[i + num + 1] >> (8 - rem); |
| #ifdef L_ENDIAN |
| v0 = sh[0], v1 = sh[1]; |
| #else |
| iv = &ovec[0]; |
| c2l(iv, v0); |
| c2l(iv, v1); |
| #endif |
| } |
| 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; |
| } |
