1 /* 2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #include "des_local.h" 11 12 /* 13 * The input and output encrypted as though 64bit ofb mode is being used. 14 * The extra state information to record how much of the 64bit block we have 15 * used is contained in *num; 16 */ 17 void DES_ede3_ofb64_encrypt(register const unsigned char *in, 18 register unsigned char *out, long length, 19 DES_key_schedule *k1, DES_key_schedule *k2, 20 DES_key_schedule *k3, DES_cblock *ivec, int *num) 21 { 22 register DES_LONG v0, v1; 23 register int n = *num; 24 register long l = length; 25 DES_cblock d; 26 register char *dp; 27 DES_LONG ti[2]; 28 unsigned char *iv; 29 int save = 0; 30 31 iv = &(*ivec)[0]; 32 c2l(iv, v0); 33 c2l(iv, v1); 34 ti[0] = v0; 35 ti[1] = v1; 36 dp = (char *)d; 37 l2c(v0, dp); 38 l2c(v1, dp); 39 while (l--) { 40 if (n == 0) { 41 /* ti[0]=v0; */ 42 /* ti[1]=v1; */ 43 DES_encrypt3(ti, k1, k2, k3); 44 v0 = ti[0]; 45 v1 = ti[1]; 46 47 dp = (char *)d; 48 l2c(v0, dp); 49 l2c(v1, dp); 50 save++; 51 } 52 *(out++) = *(in++) ^ d[n]; 53 n = (n + 1) & 0x07; 54 } 55 if (save) { 56 iv = &(*ivec)[0]; 57 l2c(v0, iv); 58 l2c(v1, iv); 59 } 60 v0 = v1 = ti[0] = ti[1] = 0; 61 *num = n; 62 } 63