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 */
IDEA_ofb64_encrypt(const unsigned char * in,unsigned char * out,long length,IDEA_KEY_SCHEDULE * schedule,unsigned char * ivec,int * num)25 void 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
