| 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 | DES_LONG DES_cbc_cksum(const unsigned char *in, DES_cblock *output, |
| 13 | long length, DES_key_schedule *schedule, |
| 14 | const_DES_cblock *ivec) |
| 15 | { |
| 16 | register DES_LONG tout0, tout1, tin0, tin1; |
| 17 | register long l = length; |
| 18 | DES_LONG tin[2]; |
| 19 | unsigned char *out = &(*output)[0]; |
| 20 | const unsigned char *iv = &(*ivec)[0]; |
| 21 | |
| 22 | c2l(iv, tout0); |
| 23 | c2l(iv, tout1); |
| 24 | for (; l > 0; l -= 8) { |
| 25 | if (l >= 8) { |
| 26 | c2l(in, tin0); |
| 27 | c2l(in, tin1); |
| 28 | } else |
| 29 | c2ln(in, tin0, tin1, l); |
| 30 | |
| 31 | tin0 ^= tout0; |
| 32 | tin[0] = tin0; |
| 33 | tin1 ^= tout1; |
| 34 | tin[1] = tin1; |
| 35 | DES_encrypt1((DES_LONG *)tin, schedule, DES_ENCRYPT); |
| 36 | tout0 = tin[0]; |
| 37 | tout1 = tin[1]; |
| 38 | } |
| 39 | if (out != NULL) { |
| 40 | l2c(tout0, out); |
| 41 | l2c(tout1, out); |
| 42 | } |
| 43 | tout0 = tin0 = tin1 = tin[0] = tin[1] = 0; |
| 44 | /* |
| 45 | * Transform the data in tout1 so that it will match the return value |
| 46 | * that the MIT Kerberos mit_des_cbc_cksum API returns. |
| 47 | */ |
| 48 | tout1 = ((tout1 >> 24L) & 0x000000FF) |
| 49 | | ((tout1 >> 8L) & 0x0000FF00) |
| 50 | | ((tout1 << 8L) & 0x00FF0000) |
| 51 | | ((tout1 << 24L) & 0xFF000000); |
| 52 | return tout1; |
| 53 | } |