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 <openssl/blowfish.h> 11 #include "bf_local.h" 12 13 /* 14 * The input and output encrypted as though 64bit ofb mode is being used. 15 * The extra state information to record how much of the 64bit block we have 16 * used is contained in *num; 17 */ 18 void BF_ofb64_encrypt(const unsigned char *in, unsigned char *out, 19 long length, const BF_KEY *schedule, 20 unsigned char *ivec, int *num) 21 { 22 register BF_LONG v0, v1, t; 23 register int n = *num; 24 register long l = length; 25 unsigned char d[8]; 26 register char *dp; 27 BF_LONG ti[2]; 28 unsigned char *iv; 29 int save = 0; 30 31 iv = (unsigned char *)ivec; 32 n2l(iv, v0); 33 n2l(iv, v1); 34 ti[0] = v0; 35 ti[1] = v1; 36 dp = (char *)d; 37 l2n(v0, dp); 38 l2n(v1, dp); 39 while (l--) { 40 if (n == 0) { 41 BF_encrypt((BF_LONG *)ti, schedule); 42 dp = (char *)d; 43 t = ti[0]; 44 l2n(t, dp); 45 t = ti[1]; 46 l2n(t, dp); 47 save++; 48 } 49 *(out++) = *(in++) ^ d[n]; 50 n = (n + 1) & 0x07; 51 } 52 if (save) { 53 v0 = ti[0]; 54 v1 = ti[1]; 55 iv = (unsigned char *)ivec; 56 l2n(v0, iv); 57 l2n(v1, iv); 58 } 59 t = v0 = v1 = ti[0] = ti[1] = 0; 60 *num = n; 61 } 62