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| 1 /* ==================================================================== |
| 2 * Copyright (c) 2008 The OpenSSL Project. All rights reserved. |
| 3 * |
| 4 * Redistribution and use in source and binary forms, with or without |
| 5 * modification, are permitted provided that the following conditions |
| 6 * are met: |
| 7 * |
| 8 * 1. Redistributions of source code must retain the above copyright |
| 9 * notice, this list of conditions and the following disclaimer. |
| 10 * |
| 11 * 2. Redistributions in binary form must reproduce the above copyright |
| 12 * notice, this list of conditions and the following disclaimer in |
| 13 * the documentation and/or other materials provided with the |
| 14 * distribution. |
| 15 * |
| 16 * 3. All advertising materials mentioning features or use of this |
| 17 * software must display the following acknowledgment: |
| 18 * "This product includes software developed by the OpenSSL Project |
| 19 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" |
| 20 * |
| 21 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| 22 * endorse or promote products derived from this software without |
| 23 * prior written permission. For written permission, please contact |
| 24 * openssl-core@openssl.org. |
| 25 * |
| 26 * 5. Products derived from this software may not be called "OpenSSL" |
| 27 * nor may "OpenSSL" appear in their names without prior written |
| 28 * permission of the OpenSSL Project. |
| 29 * |
| 30 * 6. Redistributions of any form whatsoever must retain the following |
| 31 * acknowledgment: |
| 32 * "This product includes software developed by the OpenSSL Project |
| 33 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" |
| 34 * |
| 35 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| 36 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 38 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| 39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 41 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 42 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 44 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 45 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 46 * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 47 * ==================================================================== |
| 48 * |
| 49 */ |
| 50 |
| 51 #include "modes.h" |
| 52 #include <string.h> |
| 53 |
| 54 #ifndef MODES_DEBUG |
| 55 # ifndef NDEBUG |
| 56 # define NDEBUG |
| 57 # endif |
| 58 #endif |
| 59 #include <assert.h> |
| 60 |
| 61 #define STRICT_ALIGNMENT |
| 62 #if defined(__i386) || defined(__i386__) || \ |
| 63 defined(__x86_64) || defined(__x86_64__) || \ |
| 64 defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64) || \ |
| 65 defined(__s390__) || defined(__s390x__) |
| 66 # undef STRICT_ALIGNMENT |
| 67 #endif |
| 68 |
| 69 /* The input and output encrypted as though 128bit ofb mode is being |
| 70 * used. The extra state information to record how much of the |
| 71 * 128bit block we have used is contained in *num; |
| 72 */ |
| 73 void CRYPTO_ofb128_encrypt(const unsigned char *in, unsigned char *out, |
| 74 size_t len, const void *key, |
| 75 unsigned char ivec[16], int *num, |
| 76 block128_f block) |
| 77 { |
| 78 unsigned int n; |
| 79 size_t l=0; |
| 80 |
| 81 assert(in && out && key && ivec && num); |
| 82 |
| 83 n = *num; |
| 84 |
| 85 #if !defined(OPENSSL_SMALL_FOOTPRINT) |
| 86 if (16%sizeof(size_t) == 0) do { /* always true actually */ |
| 87 while (n && len) { |
| 88 *(out++) = *(in++) ^ ivec[n]; |
| 89 --len; |
| 90 n = (n+1) % 16; |
| 91 } |
| 92 #if defined(STRICT_ALIGNMENT) |
| 93 if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) |
| 94 break; |
| 95 #endif |
| 96 while (len>=16) { |
| 97 (*block)(ivec, ivec, key); |
| 98 for (; n<16; n+=sizeof(size_t)) |
| 99 *(size_t*)(out+n) = |
| 100 *(size_t*)(in+n) ^ *(size_t*)(ivec+n); |
| 101 len -= 16; |
| 102 out += 16; |
| 103 in += 16; |
| 104 n = 0; |
| 105 } |
| 106 if (len) { |
| 107 (*block)(ivec, ivec, key); |
| 108 while (len--) { |
| 109 out[n] = in[n] ^ ivec[n]; |
| 110 ++n; |
| 111 } |
| 112 } |
| 113 *num = n; |
| 114 return; |
| 115 } while(0); |
| 116 /* the rest would be commonly eliminated by x86* compiler */ |
| 117 #endif |
| 118 while (l<len) { |
| 119 if (n==0) { |
| 120 (*block)(ivec, ivec, key); |
| 121 } |
| 122 out[l] = in[l] ^ ivec[n]; |
| 123 ++l; |
| 124 n = (n+1) % 16; |
| 125 } |
| 126 |
| 127 *num=n; |
| 128 } |
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