1 /* 2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (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 /* 11 * DES low level APIs are deprecated for public use, but still ok for internal 12 * use. 13 */ 14 #include "internal/deprecated.h" 15 16 #include "des_local.h" 17 18 /* 19 * The input and output encrypted as though 64bit ofb mode is being used. 20 * The extra state information to record how much of the 64bit block we have 21 * used is contained in *num; 22 */ 23 void DES_ede3_ofb64_encrypt(register const unsigned char *in, 24 register unsigned char *out, long length, 25 DES_key_schedule *k1, DES_key_schedule *k2, 26 DES_key_schedule *k3, DES_cblock *ivec, int *num) 27 { 28 register DES_LONG v0, v1; 29 register int n = *num; 30 register long l = length; 31 DES_cblock d; 32 register char *dp; 33 DES_LONG ti[2]; 34 unsigned char *iv; 35 int save = 0; 36 37 iv = &(*ivec)[0]; 38 c2l(iv, v0); 39 c2l(iv, v1); 40 ti[0] = v0; 41 ti[1] = v1; 42 dp = (char *)d; 43 l2c(v0, dp); 44 l2c(v1, dp); 45 while (l--) { 46 if (n == 0) { 47 /* ti[0]=v0; */ 48 /* ti[1]=v1; */ 49 DES_encrypt3(ti, k1, k2, k3); 50 v0 = ti[0]; 51 v1 = ti[1]; 52 53 dp = (char *)d; 54 l2c(v0, dp); 55 l2c(v1, dp); 56 save++; 57 } 58 *(out++) = *(in++) ^ d[n]; 59 n = (n + 1) & 0x07; 60 } 61 if (save) { 62 iv = &(*ivec)[0]; 63 l2c(v0, iv); 64 l2c(v1, iv); 65 } 66 v0 = v1 = ti[0] = ti[1] = 0; 67 *num = n; 68 } 69