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 * BF low level APIs are deprecated for public use, but still ok for internal
12 * use.
13 */
14#include "internal/deprecated.h"
15
16#include <openssl/blowfish.h>
17#include "bf_local.h"
18
19/*
20 * The input and output encrypted as though 64bit ofb mode is being used.
21 * The extra state information to record how much of the 64bit block we have
22 * used is contained in *num;
23 */
24void BF_ofb64_encrypt(const unsigned char *in, unsigned char *out,
25                      long length, const BF_KEY *schedule,
26                      unsigned char *ivec, int *num)
27{
28    register BF_LONG v0, v1, t;
29    register int n = *num;
30    register long l = length;
31    unsigned char d[8];
32    register char *dp;
33    BF_LONG ti[2];
34    unsigned char *iv;
35    int save = 0;
36
37    iv = (unsigned char *)ivec;
38    n2l(iv, v0);
39    n2l(iv, v1);
40    ti[0] = v0;
41    ti[1] = v1;
42    dp = (char *)d;
43    l2n(v0, dp);
44    l2n(v1, dp);
45    while (l--) {
46        if (n == 0) {
47            BF_encrypt((BF_LONG *)ti, schedule);
48            dp = (char *)d;
49            t = ti[0];
50            l2n(t, dp);
51            t = ti[1];
52            l2n(t, dp);
53            save++;
54        }
55        *(out++) = *(in++) ^ d[n];
56        n = (n + 1) & 0x07;
57    }
58    if (save) {
59        v0 = ti[0];
60        v1 = ti[1];
61        iv = (unsigned char *)ivec;
62        l2n(v0, iv);
63        l2n(v1, iv);
64    }
65    t = v0 = v1 = ti[0] = ti[1] = 0;
66    *num = n;
67}
68