/*

 * 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"

void IDEA_cbc_encrypt(const unsigned char *in, unsigned char *out,

                      long length, IDEA_KEY_SCHEDULE *ks, unsigned char *iv,

                      int encrypt)

{

    register unsigned long tin0, tin1;

    register unsigned long tout0, tout1, xor0, xor1;

    register long l = length;

    unsigned long tin[2];

    if (encrypt) {

        n2l(iv, tout0);

        n2l(iv, tout1);

        iv -= 8;

        for (l -= 8; l >= 0; l -= 8) {

            n2l(in, tin0);

            n2l(in, tin1);

            tin0 ^= tout0;

            tin1 ^= tout1;

            tin[0] = tin0;

            tin[1] = tin1;

            IDEA_encrypt(tin, ks);

            tout0 = tin[0];

            l2n(tout0, out);

            tout1 = tin[1];

            l2n(tout1, out);

        }

        if (l != -8) {

            n2ln(in, tin0, tin1, l + 8);

            tin0 ^= tout0;

            tin1 ^= tout1;

            tin[0] = tin0;

            tin[1] = tin1;

            IDEA_encrypt(tin, ks);

            tout0 = tin[0];

            l2n(tout0, out);

            tout1 = tin[1];

            l2n(tout1, out);

        }

        l2n(tout0, iv);

        l2n(tout1, iv);

    } else {

        n2l(iv, xor0);

        n2l(iv, xor1);

        iv -= 8;

        for (l -= 8; l >= 0; l -= 8) {

            n2l(in, tin0);

            tin[0] = tin0;

            n2l(in, tin1);

            tin[1] = tin1;

            IDEA_encrypt(tin, ks);

            tout0 = tin[0] ^ xor0;

            tout1 = tin[1] ^ xor1;

            l2n(tout0, out);

            l2n(tout1, out);

            xor0 = tin0;

            xor1 = tin1;

        }

        if (l != -8) {

            n2l(in, tin0);

            tin[0] = tin0;

            n2l(in, tin1);

            tin[1] = tin1;

            IDEA_encrypt(tin, ks);

            tout0 = tin[0] ^ xor0;

            tout1 = tin[1] ^ xor1;

            l2nn(tout0, tout1, out, l + 8);

            xor0 = tin0;

            xor1 = tin1;

        }

        l2n(xor0, iv);

        l2n(xor1, iv);

    }

    tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;

    tin[0] = tin[1] = 0;

}

void IDEA_encrypt(unsigned long *d, IDEA_KEY_SCHEDULE *key)

{

    register IDEA_INT *p;

    register unsigned long x1, x2, x3, x4, t0, t1, ul;

    x2 = d[0];

    x1 = (x2 >> 16);

    x4 = d[1];

    x3 = (x4 >> 16);

    p = &(key->data[0][0]);

    E_IDEA(0);

    E_IDEA(1);

    E_IDEA(2);

    E_IDEA(3);

    E_IDEA(4);

    E_IDEA(5);

    E_IDEA(6);

    E_IDEA(7);

    x1 &= 0xffff;

    idea_mul(x1, x1, *p, ul);

    p++;

    t0 = x3 + *(p++);

    t1 = x2 + *(p++);

    x4 &= 0xffff;

    idea_mul(x4, x4, *p, ul);

    d[0] = (t0 & 0xffff) | ((x1 & 0xffff) << 16);

    d[1] = (x4 & 0xffff) | ((t1 & 0xffff) << 16);

}