| 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 | void DES_pcbc_encrypt(const unsigned char *input, unsigned char *output, |
| 13 | long length, DES_key_schedule *schedule, |
| 14 | DES_cblock *ivec, int enc) |
| 15 | { |
| 16 | register DES_LONG sin0, sin1, xor0, xor1, tout0, tout1; |
| 17 | DES_LONG tin[2]; |
| 18 | const unsigned char *in; |
| 19 | unsigned char *out, *iv; |
| 20 | |
| 21 | in = input; |
| 22 | out = output; |
| 23 | iv = &(*ivec)[0]; |
| 24 | |
| 25 | if (enc) { |
| 26 | c2l(iv, xor0); |
| 27 | c2l(iv, xor1); |
| 28 | for (; length > 0; length -= 8) { |
| 29 | if (length >= 8) { |
| 30 | c2l(in, sin0); |
| 31 | c2l(in, sin1); |
| 32 | } else |
| 33 | c2ln(in, sin0, sin1, length); |
| 34 | tin[0] = sin0 ^ xor0; |
| 35 | tin[1] = sin1 ^ xor1; |
| 36 | DES_encrypt1((DES_LONG *)tin, schedule, DES_ENCRYPT); |
| 37 | tout0 = tin[0]; |
| 38 | tout1 = tin[1]; |
| 39 | xor0 = sin0 ^ tout0; |
| 40 | xor1 = sin1 ^ tout1; |
| 41 | l2c(tout0, out); |
| 42 | l2c(tout1, out); |
| 43 | } |
| 44 | } else { |
| 45 | c2l(iv, xor0); |
| 46 | c2l(iv, xor1); |
| 47 | for (; length > 0; length -= 8) { |
| 48 | c2l(in, sin0); |
| 49 | c2l(in, sin1); |
| 50 | tin[0] = sin0; |
| 51 | tin[1] = sin1; |
| 52 | DES_encrypt1((DES_LONG *)tin, schedule, DES_DECRYPT); |
| 53 | tout0 = tin[0] ^ xor0; |
| 54 | tout1 = tin[1] ^ xor1; |
| 55 | if (length >= 8) { |
| 56 | l2c(tout0, out); |
| 57 | l2c(tout1, out); |
| 58 | } else |
| 59 | l2cn(tout0, tout1, out, length); |
| 60 | xor0 = tout0 ^ sin0; |
| 61 | xor1 = tout1 ^ sin1; |
| 62 | } |
| 63 | } |
| 64 | tin[0] = tin[1] = 0; |
| 65 | sin0 = sin1 = xor0 = xor1 = tout0 = tout1 = 0; |
| 66 | } |