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      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  * DES low level APIs are deprecated for public use, but still ok for internal
     12  * use.
     13  */
     14 #include "internal/deprecated.h"
     15 
     16 #include "des_local.h"
     17 
     18 void DES_pcbc_encrypt(const unsigned char *input, unsigned char *output,
     19     long length, DES_key_schedule *schedule,
     20     DES_cblock *ivec, int enc)
     21 {
     22     register DES_LONG sin0, sin1, xor0, xor1, tout0, tout1;
     23     DES_LONG tin[2];
     24     const unsigned char *in;
     25     unsigned char *out, *iv;
     26 
     27     in = input;
     28     out = output;
     29     iv = &(*ivec)[0];
     30 
     31     if (enc) {
     32         c2l(iv, xor0);
     33         c2l(iv, xor1);
     34         for (; length > 0; length -= 8) {
     35             if (length >= 8) {
     36                 c2l(in, sin0);
     37                 c2l(in, sin1);
     38             } else
     39                 c2ln(in, sin0, sin1, length);
     40             tin[0] = sin0 ^ xor0;
     41             tin[1] = sin1 ^ xor1;
     42             DES_encrypt1((DES_LONG *)tin, schedule, DES_ENCRYPT);
     43             tout0 = tin[0];
     44             tout1 = tin[1];
     45             xor0 = sin0 ^ tout0;
     46             xor1 = sin1 ^ tout1;
     47             l2c(tout0, out);
     48             l2c(tout1, out);
     49         }
     50     } else {
     51         c2l(iv, xor0);
     52         c2l(iv, xor1);
     53         for (; length > 0; length -= 8) {
     54             c2l(in, sin0);
     55             c2l(in, sin1);
     56             tin[0] = sin0;
     57             tin[1] = sin1;
     58             DES_encrypt1((DES_LONG *)tin, schedule, DES_DECRYPT);
     59             tout0 = tin[0] ^ xor0;
     60             tout1 = tin[1] ^ xor1;
     61             if (length >= 8) {
     62                 l2c(tout0, out);
     63                 l2c(tout1, out);
     64             } else
     65                 l2cn(tout0, tout1, out, length);
     66             xor0 = tout0 ^ sin0;
     67             xor1 = tout1 ^ sin1;
     68         }
     69     }
     70     tin[0] = tin[1] = 0;
     71     sin0 = sin1 = xor0 = xor1 = tout0 = tout1 = 0;
     72 }
     73