| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. |
| 3 | * |
| 4 | * Licensed under the OpenSSL license (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 | #include "des_local.h" |
| 11 | |
| 12 | /* RSA's DESX */ |
| 13 | |
| 14 | void DES_xcbc_encrypt(const unsigned char *in, unsigned char *out, |
| 15 | long length, DES_key_schedule *schedule, |
| 16 | DES_cblock *ivec, const_DES_cblock *inw, |
| 17 | const_DES_cblock *outw, int enc) |
| 18 | { |
| 19 | register DES_LONG tin0, tin1; |
| 20 | register DES_LONG tout0, tout1, xor0, xor1; |
| 21 | register DES_LONG inW0, inW1, outW0, outW1; |
| 22 | register const unsigned char *in2; |
| 23 | register long l = length; |
| 24 | DES_LONG tin[2]; |
| 25 | unsigned char *iv; |
| 26 | |
| 27 | in2 = &(*inw)[0]; |
| 28 | c2l(in2, inW0); |
| 29 | c2l(in2, inW1); |
| 30 | in2 = &(*outw)[0]; |
| 31 | c2l(in2, outW0); |
| 32 | c2l(in2, outW1); |
| 33 | |
| 34 | iv = &(*ivec)[0]; |
| 35 | |
| 36 | if (enc) { |
| 37 | c2l(iv, tout0); |
| 38 | c2l(iv, tout1); |
| 39 | for (l -= 8; l >= 0; l -= 8) { |
| 40 | c2l(in, tin0); |
| 41 | c2l(in, tin1); |
| 42 | tin0 ^= tout0 ^ inW0; |
| 43 | tin[0] = tin0; |
| 44 | tin1 ^= tout1 ^ inW1; |
| 45 | tin[1] = tin1; |
| 46 | DES_encrypt1(tin, schedule, DES_ENCRYPT); |
| 47 | tout0 = tin[0] ^ outW0; |
| 48 | l2c(tout0, out); |
| 49 | tout1 = tin[1] ^ outW1; |
| 50 | l2c(tout1, out); |
| 51 | } |
| 52 | if (l != -8) { |
| 53 | c2ln(in, tin0, tin1, l + 8); |
| 54 | tin0 ^= tout0 ^ inW0; |
| 55 | tin[0] = tin0; |
| 56 | tin1 ^= tout1 ^ inW1; |
| 57 | tin[1] = tin1; |
| 58 | DES_encrypt1(tin, schedule, DES_ENCRYPT); |
| 59 | tout0 = tin[0] ^ outW0; |
| 60 | l2c(tout0, out); |
| 61 | tout1 = tin[1] ^ outW1; |
| 62 | l2c(tout1, out); |
| 63 | } |
| 64 | iv = &(*ivec)[0]; |
| 65 | l2c(tout0, iv); |
| 66 | l2c(tout1, iv); |
| 67 | } else { |
| 68 | c2l(iv, xor0); |
| 69 | c2l(iv, xor1); |
| 70 | for (l -= 8; l > 0; l -= 8) { |
| 71 | c2l(in, tin0); |
| 72 | tin[0] = tin0 ^ outW0; |
| 73 | c2l(in, tin1); |
| 74 | tin[1] = tin1 ^ outW1; |
| 75 | DES_encrypt1(tin, schedule, DES_DECRYPT); |
| 76 | tout0 = tin[0] ^ xor0 ^ inW0; |
| 77 | tout1 = tin[1] ^ xor1 ^ inW1; |
| 78 | l2c(tout0, out); |
| 79 | l2c(tout1, out); |
| 80 | xor0 = tin0; |
| 81 | xor1 = tin1; |
| 82 | } |
| 83 | if (l != -8) { |
| 84 | c2l(in, tin0); |
| 85 | tin[0] = tin0 ^ outW0; |
| 86 | c2l(in, tin1); |
| 87 | tin[1] = tin1 ^ outW1; |
| 88 | DES_encrypt1(tin, schedule, DES_DECRYPT); |
| 89 | tout0 = tin[0] ^ xor0 ^ inW0; |
| 90 | tout1 = tin[1] ^ xor1 ^ inW1; |
| 91 | l2cn(tout0, tout1, out, l + 8); |
| 92 | xor0 = tin0; |
| 93 | xor1 = tin1; |
| 94 | } |
| 95 | |
| 96 | iv = &(*ivec)[0]; |
| 97 | l2c(xor0, iv); |
| 98 | l2c(xor1, iv); |
| 99 | } |
| 100 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; |
| 101 | inW0 = inW1 = outW0 = outW1 = 0; |
| 102 | tin[0] = tin[1] = 0; |
| 103 | } |