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