[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/crypto.h>
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| 11 | #include "des_locl.h"
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| 12 |
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| 13 | void DES_string_to_key(const char *str, DES_cblock *key)
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| 14 | {
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| 15 | DES_key_schedule ks;
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| 16 | int i, length;
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| 17 |
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| 18 | memset(key, 0, 8);
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| 19 | length = strlen(str);
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| 20 | #ifdef OLD_STR_TO_KEY
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| 21 | for (i = 0; i < length; i++)
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| 22 | (*key)[i % 8] ^= (str[i] << 1);
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| 23 | #else /* MIT COMPATIBLE */
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| 24 | for (i = 0; i < length; i++) {
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| 25 | register unsigned char j = str[i];
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| 26 |
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| 27 | if ((i % 16) < 8)
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| 28 | (*key)[i % 8] ^= (j << 1);
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| 29 | else {
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| 30 | /* Reverse the bit order 05/05/92 eay */
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| 31 | j = ((j << 4) & 0xf0) | ((j >> 4) & 0x0f);
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| 32 | j = ((j << 2) & 0xcc) | ((j >> 2) & 0x33);
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| 33 | j = ((j << 1) & 0xaa) | ((j >> 1) & 0x55);
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| 34 | (*key)[7 - (i % 8)] ^= j;
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| 35 | }
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| 36 | }
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| 37 | #endif
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| 38 | DES_set_odd_parity(key);
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| 39 | DES_set_key_unchecked(key, &ks);
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| 40 | DES_cbc_cksum((const unsigned char *)str, key, length, &ks, key);
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| 41 | OPENSSL_cleanse(&ks, sizeof(ks));
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| 42 | DES_set_odd_parity(key);
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| 43 | }
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| 44 |
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| 45 | void DES_string_to_2keys(const char *str, DES_cblock *key1, DES_cblock *key2)
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| 46 | {
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| 47 | DES_key_schedule ks;
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| 48 | int i, length;
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| 49 |
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| 50 | memset(key1, 0, 8);
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| 51 | memset(key2, 0, 8);
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| 52 | length = strlen(str);
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| 53 | #ifdef OLD_STR_TO_KEY
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| 54 | if (length <= 8) {
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| 55 | for (i = 0; i < length; i++) {
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| 56 | (*key2)[i] = (*key1)[i] = (str[i] << 1);
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| 57 | }
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| 58 | } else {
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| 59 | for (i = 0; i < length; i++) {
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| 60 | if ((i / 8) & 1)
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| 61 | (*key2)[i % 8] ^= (str[i] << 1);
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| 62 | else
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| 63 | (*key1)[i % 8] ^= (str[i] << 1);
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| 64 | }
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| 65 | }
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| 66 | #else /* MIT COMPATIBLE */
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| 67 | for (i = 0; i < length; i++) {
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| 68 | register unsigned char j = str[i];
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| 69 |
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| 70 | if ((i % 32) < 16) {
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| 71 | if ((i % 16) < 8)
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| 72 | (*key1)[i % 8] ^= (j << 1);
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| 73 | else
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| 74 | (*key2)[i % 8] ^= (j << 1);
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| 75 | } else {
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| 76 | j = ((j << 4) & 0xf0) | ((j >> 4) & 0x0f);
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| 77 | j = ((j << 2) & 0xcc) | ((j >> 2) & 0x33);
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| 78 | j = ((j << 1) & 0xaa) | ((j >> 1) & 0x55);
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| 79 | if ((i % 16) < 8)
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| 80 | (*key1)[7 - (i % 8)] ^= j;
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| 81 | else
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| 82 | (*key2)[7 - (i % 8)] ^= j;
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| 83 | }
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| 84 | }
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| 85 | if (length <= 8)
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| 86 | memcpy(key2, key1, 8);
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| 87 | #endif
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| 88 | DES_set_odd_parity(key1);
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| 89 | DES_set_odd_parity(key2);
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| 90 | DES_set_key_unchecked(key1, &ks);
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| 91 | DES_cbc_cksum((const unsigned char *)str, key1, length, &ks, key1);
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| 92 | DES_set_key_unchecked(key2, &ks);
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| 93 | DES_cbc_cksum((const unsigned char *)str, key2, length, &ks, key2);
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| 94 | OPENSSL_cleanse(&ks, sizeof(ks));
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| 95 | DES_set_odd_parity(key1);
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| 96 | DES_set_odd_parity(key2);
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| 97 | }
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