| 1 | /*
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| 2 | * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (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 | /*
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| 11 | * DES low level APIs are deprecated for public use, but still ok for internal
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| 12 | * use.
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| 13 | */
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| 14 | #include "internal/deprecated.h"
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| 15 |
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| 16 | #include "des_local.h"
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| 17 |
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| 18 | /* RSA's DESX */
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| 19 |
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| 20 | void DES_xcbc_encrypt(const unsigned char *in, unsigned char *out,
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| 21 | long length, DES_key_schedule *schedule,
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| 22 | DES_cblock *ivec, const_DES_cblock *inw,
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| 23 | const_DES_cblock *outw, int enc)
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| 24 | {
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| 25 | register DES_LONG tin0, tin1;
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| 26 | register DES_LONG tout0, tout1, xor0, xor1;
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| 27 | register DES_LONG inW0, inW1, outW0, outW1;
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| 28 | register const unsigned char *in2;
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| 29 | register long l = length;
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| 30 | DES_LONG tin[2];
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| 31 | unsigned char *iv;
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| 32 |
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| 33 | in2 = &(*inw)[0];
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| 34 | c2l(in2, inW0);
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| 35 | c2l(in2, inW1);
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| 36 | in2 = &(*outw)[0];
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| 37 | c2l(in2, outW0);
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| 38 | c2l(in2, outW1);
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| 39 |
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| 40 | iv = &(*ivec)[0];
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| 41 |
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| 42 | if (enc) {
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| 43 | c2l(iv, tout0);
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| 44 | c2l(iv, tout1);
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| 45 | for (l -= 8; l >= 0; l -= 8) {
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| 46 | c2l(in, tin0);
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| 47 | c2l(in, tin1);
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| 48 | tin0 ^= tout0 ^ inW0;
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| 49 | tin[0] = tin0;
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| 50 | tin1 ^= tout1 ^ inW1;
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| 51 | tin[1] = tin1;
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| 52 | DES_encrypt1(tin, schedule, DES_ENCRYPT);
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| 53 | tout0 = tin[0] ^ outW0;
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| 54 | l2c(tout0, out);
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| 55 | tout1 = tin[1] ^ outW1;
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| 56 | l2c(tout1, out);
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| 57 | }
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| 58 | if (l != -8) {
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| 59 | c2ln(in, tin0, tin1, l + 8);
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| 60 | tin0 ^= tout0 ^ inW0;
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| 61 | tin[0] = tin0;
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| 62 | tin1 ^= tout1 ^ inW1;
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| 63 | tin[1] = tin1;
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| 64 | DES_encrypt1(tin, schedule, DES_ENCRYPT);
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| 65 | tout0 = tin[0] ^ outW0;
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| 66 | l2c(tout0, out);
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| 67 | tout1 = tin[1] ^ outW1;
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| 68 | l2c(tout1, out);
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| 69 | }
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| 70 | iv = &(*ivec)[0];
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| 71 | l2c(tout0, iv);
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| 72 | l2c(tout1, iv);
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| 73 | } else {
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| 74 | c2l(iv, xor0);
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| 75 | c2l(iv, xor1);
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| 76 | for (l -= 8; l > 0; l -= 8) {
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| 77 | c2l(in, tin0);
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| 78 | tin[0] = tin0 ^ outW0;
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| 79 | c2l(in, tin1);
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| 80 | tin[1] = tin1 ^ outW1;
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| 81 | DES_encrypt1(tin, schedule, DES_DECRYPT);
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| 82 | tout0 = tin[0] ^ xor0 ^ inW0;
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| 83 | tout1 = tin[1] ^ xor1 ^ inW1;
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| 84 | l2c(tout0, out);
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| 85 | l2c(tout1, out);
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| 86 | xor0 = tin0;
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| 87 | xor1 = tin1;
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| 88 | }
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| 89 | if (l != -8) {
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| 90 | c2l(in, tin0);
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| 91 | tin[0] = tin0 ^ outW0;
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| 92 | c2l(in, tin1);
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| 93 | tin[1] = tin1 ^ outW1;
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| 94 | DES_encrypt1(tin, schedule, DES_DECRYPT);
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| 95 | tout0 = tin[0] ^ xor0 ^ inW0;
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| 96 | tout1 = tin[1] ^ xor1 ^ inW1;
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| 97 | l2cn(tout0, tout1, out, l + 8);
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| 98 | xor0 = tin0;
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| 99 | xor1 = tin1;
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| 100 | }
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| 101 |
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| 102 | iv = &(*ivec)[0];
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| 103 | l2c(xor0, iv);
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| 104 | l2c(xor1, iv);
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| 105 | }
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| 106 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
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| 107 | inW0 = inW1 = outW0 = outW1 = 0;
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| 108 | tin[0] = tin[1] = 0;
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| 109 | }
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