mirror of
https://github.com/openssl/openssl.git
synced 2024-12-21 06:09:35 +08:00
33388b44b6
Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/11616)
120 lines
2.9 KiB
C
120 lines
2.9 KiB
C
/*
|
|
* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
|
|
*
|
|
* Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
* this file except in compliance with the License. You can obtain a copy
|
|
* in the file LICENSE in the source distribution or at
|
|
* https://www.openssl.org/source/license.html
|
|
*/
|
|
|
|
/*
|
|
* IDEA low level APIs are deprecated for public use, but still ok for internal
|
|
* use where we're using them to implement the higher level EVP interface, as is
|
|
* the case here.
|
|
*/
|
|
#include "internal/deprecated.h"
|
|
|
|
#include <openssl/idea.h>
|
|
#include "idea_local.h"
|
|
|
|
static IDEA_INT inverse(unsigned int xin);
|
|
void IDEA_set_encrypt_key(const unsigned char *key, IDEA_KEY_SCHEDULE *ks)
|
|
{
|
|
int i;
|
|
register IDEA_INT *kt, *kf, r0, r1, r2;
|
|
|
|
kt = &(ks->data[0][0]);
|
|
n2s(key, kt[0]);
|
|
n2s(key, kt[1]);
|
|
n2s(key, kt[2]);
|
|
n2s(key, kt[3]);
|
|
n2s(key, kt[4]);
|
|
n2s(key, kt[5]);
|
|
n2s(key, kt[6]);
|
|
n2s(key, kt[7]);
|
|
|
|
kf = kt;
|
|
kt += 8;
|
|
for (i = 0; i < 6; i++) {
|
|
r2 = kf[1];
|
|
r1 = kf[2];
|
|
*(kt++) = ((r2 << 9) | (r1 >> 7)) & 0xffff;
|
|
r0 = kf[3];
|
|
*(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff;
|
|
r1 = kf[4];
|
|
*(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff;
|
|
r0 = kf[5];
|
|
*(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff;
|
|
r1 = kf[6];
|
|
*(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff;
|
|
r0 = kf[7];
|
|
*(kt++) = ((r1 << 9) | (r0 >> 7)) & 0xffff;
|
|
r1 = kf[0];
|
|
if (i >= 5)
|
|
break;
|
|
*(kt++) = ((r0 << 9) | (r1 >> 7)) & 0xffff;
|
|
*(kt++) = ((r1 << 9) | (r2 >> 7)) & 0xffff;
|
|
kf += 8;
|
|
}
|
|
}
|
|
|
|
void IDEA_set_decrypt_key(IDEA_KEY_SCHEDULE *ek, IDEA_KEY_SCHEDULE *dk)
|
|
{
|
|
int r;
|
|
register IDEA_INT *fp, *tp, t;
|
|
|
|
tp = &(dk->data[0][0]);
|
|
fp = &(ek->data[8][0]);
|
|
for (r = 0; r < 9; r++) {
|
|
*(tp++) = inverse(fp[0]);
|
|
*(tp++) = ((int)(0x10000L - fp[2]) & 0xffff);
|
|
*(tp++) = ((int)(0x10000L - fp[1]) & 0xffff);
|
|
*(tp++) = inverse(fp[3]);
|
|
if (r == 8)
|
|
break;
|
|
fp -= 6;
|
|
*(tp++) = fp[4];
|
|
*(tp++) = fp[5];
|
|
}
|
|
|
|
tp = &(dk->data[0][0]);
|
|
t = tp[1];
|
|
tp[1] = tp[2];
|
|
tp[2] = t;
|
|
|
|
t = tp[49];
|
|
tp[49] = tp[50];
|
|
tp[50] = t;
|
|
}
|
|
|
|
/* taken directly from the 'paper' I'll have a look at it later */
|
|
static IDEA_INT inverse(unsigned int xin)
|
|
{
|
|
long n1, n2, q, r, b1, b2, t;
|
|
|
|
if (xin == 0)
|
|
b2 = 0;
|
|
else {
|
|
n1 = 0x10001;
|
|
n2 = xin;
|
|
b2 = 1;
|
|
b1 = 0;
|
|
|
|
do {
|
|
r = (n1 % n2);
|
|
q = (n1 - r) / n2;
|
|
if (r == 0) {
|
|
if (b2 < 0)
|
|
b2 = 0x10001 + b2;
|
|
} else {
|
|
n1 = n2;
|
|
n2 = r;
|
|
t = b2;
|
|
b2 = b1 - q * b2;
|
|
b1 = t;
|
|
}
|
|
} while (r != 0);
|
|
}
|
|
return (IDEA_INT)b2;
|
|
}
|