195c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley/* ==================================================================== 295c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * Copyright (c) 2008 The OpenSSL Project. All rights reserved. 395c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * 495c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * Redistribution and use in source and binary forms, with or without 595c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * modification, are permitted provided that the following conditions 695c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * are met: 795c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * 895c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * 1. Redistributions of source code must retain the above copyright 995c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * notice, this list of conditions and the following disclaimer. 1095c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * 1195c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * 2. Redistributions in binary form must reproduce the above copyright 1295c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * notice, this list of conditions and the following disclaimer in 1395c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * the documentation and/or other materials provided with the 1495c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * distribution. 1595c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * 1695c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * 3. All advertising materials mentioning features or use of this 1795c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * software must display the following acknowledgment: 1895c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * "This product includes software developed by the OpenSSL Project 1995c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 2095c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * 2195c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 2295c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * endorse or promote products derived from this software without 2395c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * prior written permission. For written permission, please contact 2495c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * openssl-core@openssl.org. 2595c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * 2695c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * 5. Products derived from this software may not be called "OpenSSL" 2795c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * nor may "OpenSSL" appear in their names without prior written 2895c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * permission of the OpenSSL Project. 2995c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * 3095c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * 6. Redistributions of any form whatsoever must retain the following 3195c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * acknowledgment: 3295c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * "This product includes software developed by the OpenSSL Project 3395c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 3495c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * 3595c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 3695c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 3795c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 3895c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 3995c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 4095c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 4195c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 4295c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4395c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 4495c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 4595c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 4695c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * OF THE POSSIBILITY OF SUCH DAMAGE. 4795c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley * ==================================================================== */ 4895c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley 4995c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley#include <openssl/modes.h> 5095c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley 5195c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley#include <assert.h> 5295c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley 5395c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley#include "internal.h" 5495c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley 5595c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley 5695c29f3cd1f6c08c6c0927868683392eea727ccAdam Langleyvoid CRYPTO_ofb128_encrypt(const uint8_t *in, uint8_t *out, size_t len, 5795c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley const void *key, uint8_t ivec[16], int *num, 5895c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley block128_f block) { 5995c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley unsigned int n; 6095c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley size_t l=0; 6195c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley 6295c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley assert(in && out && key && ivec && num); 6395c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley assert((16 % sizeof(size_t)) == 0); 6495c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley 6595c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley n = *num; 6695c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley 6795c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley while (n && len) { 6895c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley *(out++) = *(in++) ^ ivec[n]; 6995c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley --len; 7095c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley n = (n + 1) % 16; 7195c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley } 7295c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley 7395c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley if (STRICT_ALIGNMENT && 7495c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) { 7595c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley while (l < len) { 7695c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley if (n == 0) { 7795c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley (*block)(ivec, ivec, key); 7895c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley } 7995c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley out[l] = in[l] ^ ivec[n]; 8095c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley ++l; 8195c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley n = (n + 1) % 16; 8295c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley } 8395c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley 8495c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley *num = n; 8595c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley return; 8695c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley } 8795c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley 8895c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley while (len >= 16) { 8995c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley (*block)(ivec, ivec, key); 9095c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley for (; n < 16; n += sizeof(size_t)) { 9195c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley *(size_t *)(out + n) = *(size_t *)(in + n) ^ *(size_t *)(ivec + n); 9295c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley } 9395c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley len -= 16; 9495c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley out += 16; 9595c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley in += 16; 9695c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley n = 0; 9795c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley } 9895c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley if (len) { 9995c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley (*block)(ivec, ivec, key); 10095c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley while (len--) { 10195c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley out[n] = in[n] ^ ivec[n]; 10295c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley ++n; 10395c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley } 10495c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley } 10595c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley *num = n; 10695c29f3cd1f6c08c6c0927868683392eea727ccAdam Langley} 107