2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
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
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
15 #include "internal/deprecated.h"
17 #include <openssl/idea.h>
18 #include "idea_local.h"
20 static IDEA_INT inverse(unsigned int xin);
21 void IDEA_set_encrypt_key(const unsigned char *key, IDEA_KEY_SCHEDULE *ks)
24 register IDEA_INT *kt, *kf, r0, r1, r2;
26 kt = &(ks->data[0][0]);
38 for (i = 0; i < 6; i++) {
41 *(kt++) = ((r2 << 9) | (r1 >> 7)) & 0xffff;
43 *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff;
45 *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff;
47 *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff;
49 *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff;
51 *(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff;
55 *(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff;
56 *(kt++) = ((r1 << 9) | (r2 >> 7)) & 0xffff;
61 void IDEA_set_decrypt_key(IDEA_KEY_SCHEDULE *ek, IDEA_KEY_SCHEDULE *dk)
64 register IDEA_INT *fp, *tp, t;
66 tp = &(dk->data[0][0]);
67 fp = &(ek->data[8][0]);
68 for (r = 0; r < 9; r++) {
69 *(tp++) = inverse(fp[0]);
70 *(tp++) = ((int)(0x10000L - fp[2]) & 0xffff);
71 *(tp++) = ((int)(0x10000L - fp[1]) & 0xffff);
72 *(tp++) = inverse(fp[3]);
80 tp = &(dk->data[0][0]);
90 /* taken directly from the 'paper' I'll have a look at it later */
91 static IDEA_INT inverse(unsigned int xin)
93 long n1, n2, q, r, b1, b2, t;