crypto/bf/bf_skey.c

   1 /*
   2  * Copyright 1995-2016 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 <stdio.h>
  17 #include <string.h>
  18 #include <openssl/blowfish.h>
  19 #include "bf_local.h"
  20 #include "bf_pi.h"
  21
  22 void BF_set_key(BF_KEY *key, int len, const unsigned char *data)
  23 {
  24     int i;
  25     BF_LONG *p, ri, in[2];
  26     const unsigned char *d, *end;
  27
  28     memcpy(key, &bf_init, sizeof(BF_KEY));
  29     p = key->P;
  30
  31     if (len > ((BF_ROUNDS + 2) * 4))
  32         len = (BF_ROUNDS + 2) * 4;
  33
  34     d = data;
  35     end = &(data[len]);
  36     for (i = 0; i < (BF_ROUNDS + 2); i++) {
  37         ri = *(d++);
  38         if (d >= end)
  39             d = data;
  40
  41         ri <<= 8;
  42         ri |= *(d++);
  43         if (d >= end)
  44             d = data;
  45
  46         ri <<= 8;
  47         ri |= *(d++);
  48         if (d >= end)
  49             d = data;
  50
  51         ri <<= 8;
  52         ri |= *(d++);
  53         if (d >= end)
  54             d = data;
  55
  56         p[i] ^= ri;
  57     }
  58
  59     in[0] = 0L;
  60     in[1] = 0L;
  61     for (i = 0; i < (BF_ROUNDS + 2); i += 2) {
  62         BF_encrypt(in, key);
  63         p[i] = in[0];
  64         p[i + 1] = in[1];
  65     }
  66
  67     p = key->S;
  68     for (i = 0; i < 4 * 256; i += 2) {
  69         BF_encrypt(in, key);
  70         p[i] = in[0];
  71         p[i + 1] = in[1];
  72     }
  73 }