1221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom/* ==================================================================== 2221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * Copyright (c) 2008 The OpenSSL Project. All rights reserved. 3221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * 4221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * Redistribution and use in source and binary forms, with or without 5221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * modification, are permitted provided that the following conditions 6221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * are met: 7221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * 8221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * 1. Redistributions of source code must retain the above copyright 9221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * notice, this list of conditions and the following disclaimer. 10221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * 11221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * 2. Redistributions in binary form must reproduce the above copyright 12221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * notice, this list of conditions and the following disclaimer in 13221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * the documentation and/or other materials provided with the 14221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * distribution. 15221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * 16221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * 3. All advertising materials mentioning features or use of this 17221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * software must display the following acknowledgment: 18221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * "This product includes software developed by the OpenSSL Project 19221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 20221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * 21221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 22221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * endorse or promote products derived from this software without 23221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * prior written permission. For written permission, please contact 24221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * openssl-core@openssl.org. 25221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * 26221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * 5. Products derived from this software may not be called "OpenSSL" 27221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * nor may "OpenSSL" appear in their names without prior written 28221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * permission of the OpenSSL Project. 29221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * 30221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * 6. Redistributions of any form whatsoever must retain the following 31221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * acknowledgment: 32221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * "This product includes software developed by the OpenSSL Project 33221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 34221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * 35221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 36221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 37221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 38221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 39221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 40221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 41221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 42221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 43221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 44221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 45221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 46221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * OF THE POSSIBILITY OF SUCH DAMAGE. 47221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * ==================================================================== 48221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * 49221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom */ 50221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 51392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom#include <openssl/crypto.h> 52392aa7cc7d2b122614c5393c3e357da07fd07af3Brian Carlstrom#include "modes_lcl.h" 53221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#include <string.h> 54221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 55221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#ifndef MODES_DEBUG 56221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom# ifndef NDEBUG 57221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom# define NDEBUG 58221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom# endif 59221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#endif 60221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#include <assert.h> 61221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 62221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom/* The input and output encrypted as though 128bit cfb mode is being 63221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * used. The extra state information to record how much of the 64221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom * 128bit block we have used is contained in *num; 65221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom */ 66221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstromvoid CRYPTO_cfb128_encrypt(const unsigned char *in, unsigned char *out, 67221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom size_t len, const void *key, 68221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom unsigned char ivec[16], int *num, 69221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom int enc, block128_f block) 70221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom{ 71221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom unsigned int n; 72221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom size_t l = 0; 73221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 74221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom assert(in && out && key && ivec && num); 75221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 76221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom n = *num; 77221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 78221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom if (enc) { 79221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#if !defined(OPENSSL_SMALL_FOOTPRINT) 80221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom if (16%sizeof(size_t) == 0) do { /* always true actually */ 81221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom while (n && len) { 82221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom *(out++) = ivec[n] ^= *(in++); 83221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom --len; 84221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom n = (n+1) % 16; 85221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 86221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#if defined(STRICT_ALIGNMENT) 87221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) 88221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom break; 89221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#endif 90221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom while (len>=16) { 91221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom (*block)(ivec, ivec, key); 923d3a1b8fcf46ca3bdb3d8f09acd6ef604624a30dBrian Carlstrom for (; n<16; n+=sizeof(size_t)) { 93221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom *(size_t*)(out+n) = 94221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom *(size_t*)(ivec+n) ^= *(size_t*)(in+n); 95221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 96221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom len -= 16; 97221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom out += 16; 98221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom in += 16; 993d3a1b8fcf46ca3bdb3d8f09acd6ef604624a30dBrian Carlstrom n = 0; 100221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 101221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom if (len) { 102221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom (*block)(ivec, ivec, key); 103221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom while (len--) { 104221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom out[n] = ivec[n] ^= in[n]; 105221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom ++n; 106221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 107221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 108221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom *num = n; 109221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom return; 110221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } while (0); 111221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom /* the rest would be commonly eliminated by x86* compiler */ 112221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#endif 113221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom while (l<len) { 114221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom if (n == 0) { 115221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom (*block)(ivec, ivec, key); 116221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 117221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom out[l] = ivec[n] ^= in[l]; 118221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom ++l; 119221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom n = (n+1) % 16; 120221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 121221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom *num = n; 122221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } else { 123221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#if !defined(OPENSSL_SMALL_FOOTPRINT) 124221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom if (16%sizeof(size_t) == 0) do { /* always true actually */ 125221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom while (n && len) { 126221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom unsigned char c; 127221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom *(out++) = ivec[n] ^ (c = *(in++)); ivec[n] = c; 128221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom --len; 129221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom n = (n+1) % 16; 130221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 131221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#if defined(STRICT_ALIGNMENT) 132221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) 133221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom break; 134221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#endif 135221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom while (len>=16) { 136221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom (*block)(ivec, ivec, key); 1373d3a1b8fcf46ca3bdb3d8f09acd6ef604624a30dBrian Carlstrom for (; n<16; n+=sizeof(size_t)) { 138221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom size_t t = *(size_t*)(in+n); 139221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom *(size_t*)(out+n) = *(size_t*)(ivec+n) ^ t; 140221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom *(size_t*)(ivec+n) = t; 141221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 142221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom len -= 16; 143221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom out += 16; 144221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom in += 16; 1453d3a1b8fcf46ca3bdb3d8f09acd6ef604624a30dBrian Carlstrom n = 0; 146221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 147221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom if (len) { 148221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom (*block)(ivec, ivec, key); 149221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom while (len--) { 150221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom unsigned char c; 151221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom out[n] = ivec[n] ^ (c = in[n]); ivec[n] = c; 152221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom ++n; 153221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 154221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 155221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom *num = n; 156221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom return; 157221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } while (0); 158221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom /* the rest would be commonly eliminated by x86* compiler */ 159221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom#endif 160221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom while (l<len) { 161221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom unsigned char c; 162221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom if (n == 0) { 163221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom (*block)(ivec, ivec, key); 164221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 165221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom out[l] = ivec[n] ^ (c = in[l]); ivec[n] = c; 166221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom ++l; 167221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom n = (n+1) % 16; 168221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 169221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom *num=n; 170221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 171221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom} 172221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 173221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom/* This expects a single block of size nbits for both in and out. Note that 174221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom it corrupts any extra bits in the last byte of out */ 175221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstromstatic void cfbr_encrypt_block(const unsigned char *in,unsigned char *out, 176221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom int nbits,const void *key, 177221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom unsigned char ivec[16],int enc, 178221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom block128_f block) 179221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom{ 180221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom int n,rem,num; 181221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom unsigned char ovec[16*2 + 1]; /* +1 because we dererefence (but don't use) one byte off the end */ 182221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 183221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom if (nbits<=0 || nbits>128) return; 184221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 185221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom /* fill in the first half of the new IV with the current IV */ 186221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom memcpy(ovec,ivec,16); 187221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom /* construct the new IV */ 188221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom (*block)(ivec,ivec,key); 189221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom num = (nbits+7)/8; 190221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom if (enc) /* encrypt the input */ 191221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom for(n=0 ; n < num ; ++n) 192221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom out[n] = (ovec[16+n] = in[n] ^ ivec[n]); 193221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom else /* decrypt the input */ 194221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom for(n=0 ; n < num ; ++n) 195221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom out[n] = (ovec[16+n] = in[n]) ^ ivec[n]; 196221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom /* shift ovec left... */ 197221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom rem = nbits%8; 198221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom num = nbits/8; 199221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom if(rem==0) 200221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom memcpy(ivec,ovec+num,16); 201221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom else 202221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom for(n=0 ; n < 16 ; ++n) 203221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom ivec[n] = ovec[n+num]<<rem | ovec[n+num+1]>>(8-rem); 204221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 205221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom /* it is not necessary to cleanse ovec, since the IV is not secret */ 206221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom} 207221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 208221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom/* N.B. This expects the input to be packed, MS bit first */ 209221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstromvoid CRYPTO_cfb128_1_encrypt(const unsigned char *in, unsigned char *out, 210221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom size_t bits, const void *key, 211221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom unsigned char ivec[16], int *num, 212221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom int enc, block128_f block) 213221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom{ 214221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom size_t n; 215221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom unsigned char c[1],d[1]; 216221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 217221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom assert(in && out && key && ivec && num); 218221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom assert(*num == 0); 219221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 220221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom for(n=0 ; n<bits ; ++n) 221221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom { 222221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0; 223221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom cfbr_encrypt_block(c,d,1,key,ivec,enc,block); 224221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom out[n/8]=(out[n/8]&~(1 << (unsigned int)(7-n%8))) | 225221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom ((d[0]&0x80) >> (unsigned int)(n%8)); 226221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom } 227221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom} 228221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 229221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstromvoid CRYPTO_cfb128_8_encrypt(const unsigned char *in, unsigned char *out, 230221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom size_t length, const void *key, 231221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom unsigned char ivec[16], int *num, 232221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom int enc, block128_f block) 233221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom{ 234221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom size_t n; 235221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 236221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom assert(in && out && key && ivec && num); 237221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom assert(*num == 0); 238221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 239221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom for(n=0 ; n<length ; ++n) 240221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom cfbr_encrypt_block(&in[n],&out[n],8,key,ivec,enc,block); 241221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom} 242221304ee937bc0910948a8be1320cb8cc4eb6d36Brian Carlstrom 243