1/* 2 * Copyright 1995-2021 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 * IDEA low level APIs are deprecated for public use, but still ok for internal 12 * use where we're using them to implement the higher level EVP interface, as is 13 * the case here. 14 */ 15#include "internal/deprecated.h" 16 17#include <openssl/idea.h> 18#include "idea_local.h" 19 20/* 21 * The input and output encrypted as though 64bit ofb mode is being used. 22 * The extra state information to record how much of the 64bit block we have 23 * used is contained in *num; 24 */ 25void IDEA_ofb64_encrypt(const unsigned char *in, unsigned char *out, 26 long length, IDEA_KEY_SCHEDULE *schedule, 27 unsigned char *ivec, int *num) 28{ 29 register unsigned long v0, v1, t; 30 register int n = *num; 31 register long l = length; 32 unsigned char d[8]; 33 register char *dp; 34 unsigned long ti[2]; 35 unsigned char *iv; 36 int save = 0; 37 38 if (n < 0) { 39 *num = -1; 40 return; 41 } 42 43 iv = (unsigned char *)ivec; 44 n2l(iv, v0); 45 n2l(iv, v1); 46 ti[0] = v0; 47 ti[1] = v1; 48 dp = (char *)d; 49 l2n(v0, dp); 50 l2n(v1, dp); 51 while (l--) { 52 if (n == 0) { 53 IDEA_encrypt((unsigned long *)ti, schedule); 54 dp = (char *)d; 55 t = ti[0]; 56 l2n(t, dp); 57 t = ti[1]; 58 l2n(t, dp); 59 save++; 60 } 61 *(out++) = *(in++) ^ d[n]; 62 n = (n + 1) & 0x07; 63 } 64 if (save) { 65 v0 = ti[0]; 66 v1 = ti[1]; 67 iv = (unsigned char *)ivec; 68 l2n(v0, iv); 69 l2n(v1, iv); 70 } 71 t = v0 = v1 = ti[0] = ti[1] = 0; 72 *num = n; 73} 74