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2039c421 1/*
3c2bdd7d 2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
0f113f3e 3 *
aa2d9a76 4 * Licensed under the Apache License 2.0 (the "License"). You may not use
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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
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8 */
9
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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
ec577822 17#include <openssl/idea.h>
706457b7 18#include "idea_local.h"
d02b48c6 19
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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;
d02b48c6 24 */
9021a5df 25void IDEA_ofb64_encrypt(const unsigned char *in, unsigned char *out,
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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;
d02b48c6 37
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38 if (n < 0) {
39 *num = -1;
40 return;
41 }
42
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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) {
9021a5df 53 IDEA_encrypt((unsigned long *)ti, schedule);
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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}