| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 1998-2016 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 | /*- |
| 11 | * #included by: |
| 12 | * cbc_enc.c (DES_cbc_encrypt) |
| 13 | * des_enc.c (DES_ncbc_encrypt) |
| 14 | */ |
| 15 | |
| 16 | #include "des_local.h" |
| 17 | |
| 18 | #ifdef CBC_ENC_C__DONT_UPDATE_IV |
| 19 | void DES_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, |
| 20 | DES_key_schedule *_schedule, DES_cblock *ivec, int enc) |
| 21 | #else |
| 22 | void DES_ncbc_encrypt(const unsigned char *in, unsigned char *out, |
| 23 | long length, DES_key_schedule *_schedule, |
| 24 | DES_cblock *ivec, int enc) |
| 25 | #endif |
| 26 | { |
| 27 | register DES_LONG tin0, tin1; |
| 28 | register DES_LONG tout0, tout1, xor0, xor1; |
| 29 | register long l = length; |
| 30 | DES_LONG tin[2]; |
| 31 | unsigned char *iv; |
| 32 | |
| 33 | iv = &(*ivec)[0]; |
| 34 | |
| 35 | if (enc) { |
| 36 | c2l(iv, tout0); |
| 37 | c2l(iv, tout1); |
| 38 | for (l -= 8; l >= 0; l -= 8) { |
| 39 | c2l(in, tin0); |
| 40 | c2l(in, tin1); |
| 41 | tin0 ^= tout0; |
| 42 | tin[0] = tin0; |
| 43 | tin1 ^= tout1; |
| 44 | tin[1] = tin1; |
| 45 | DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT); |
| 46 | tout0 = tin[0]; |
| 47 | l2c(tout0, out); |
| 48 | tout1 = tin[1]; |
| 49 | l2c(tout1, out); |
| 50 | } |
| 51 | if (l != -8) { |
| 52 | c2ln(in, tin0, tin1, l + 8); |
| 53 | tin0 ^= tout0; |
| 54 | tin[0] = tin0; |
| 55 | tin1 ^= tout1; |
| 56 | tin[1] = tin1; |
| 57 | DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT); |
| 58 | tout0 = tin[0]; |
| 59 | l2c(tout0, out); |
| 60 | tout1 = tin[1]; |
| 61 | l2c(tout1, out); |
| 62 | } |
| 63 | #ifndef CBC_ENC_C__DONT_UPDATE_IV |
| 64 | iv = &(*ivec)[0]; |
| 65 | l2c(tout0, iv); |
| 66 | l2c(tout1, iv); |
| 67 | #endif |
| 68 | } else { |
| 69 | c2l(iv, xor0); |
| 70 | c2l(iv, xor1); |
| 71 | for (l -= 8; l >= 0; l -= 8) { |
| 72 | c2l(in, tin0); |
| 73 | tin[0] = tin0; |
| 74 | c2l(in, tin1); |
| 75 | tin[1] = tin1; |
| 76 | DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT); |
| 77 | tout0 = tin[0] ^ xor0; |
| 78 | tout1 = tin[1] ^ xor1; |
| 79 | l2c(tout0, out); |
| 80 | l2c(tout1, out); |
| 81 | xor0 = tin0; |
| 82 | xor1 = tin1; |
| 83 | } |
| 84 | if (l != -8) { |
| 85 | c2l(in, tin0); |
| 86 | tin[0] = tin0; |
| 87 | c2l(in, tin1); |
| 88 | tin[1] = tin1; |
| 89 | DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT); |
| 90 | tout0 = tin[0] ^ xor0; |
| 91 | tout1 = tin[1] ^ xor1; |
| 92 | l2cn(tout0, tout1, out, l + 8); |
| 93 | #ifndef CBC_ENC_C__DONT_UPDATE_IV |
| 94 | xor0 = tin0; |
| 95 | xor1 = tin1; |
| 96 | #endif |
| 97 | } |
| 98 | #ifndef CBC_ENC_C__DONT_UPDATE_IV |
| 99 | iv = &(*ivec)[0]; |
| 100 | l2c(xor0, iv); |
| 101 | l2c(xor1, iv); |
| 102 | #endif |
| 103 | } |
| 104 | tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0; |
| 105 | tin[0] = tin[1] = 0; |
| 106 | } |