| 1 | /*
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| 2 | * Copyright 1995-2020 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 | * DES low level APIs are deprecated for public use, but still ok for internal
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| 12 | * use.
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| 13 | */
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| 14 | #include "internal/deprecated.h"
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| 15 |
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| 16 | #include "des_local.h"
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| 17 |
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| 18 | void DES_pcbc_encrypt(const unsigned char *input, unsigned char *output,
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| 19 | long length, DES_key_schedule *schedule,
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| 20 | DES_cblock *ivec, int enc)
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| 21 | {
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| 22 | register DES_LONG sin0, sin1, xor0, xor1, tout0, tout1;
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| 23 | DES_LONG tin[2];
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| 24 | const unsigned char *in;
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| 25 | unsigned char *out, *iv;
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| 26 |
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| 27 | in = input;
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| 28 | out = output;
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| 29 | iv = &(*ivec)[0];
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| 30 |
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| 31 | if (enc) {
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| 32 | c2l(iv, xor0);
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| 33 | c2l(iv, xor1);
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| 34 | for (; length > 0; length -= 8) {
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| 35 | if (length >= 8) {
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| 36 | c2l(in, sin0);
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| 37 | c2l(in, sin1);
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| 38 | } else
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| 39 | c2ln(in, sin0, sin1, length);
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| 40 | tin[0] = sin0 ^ xor0;
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| 41 | tin[1] = sin1 ^ xor1;
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| 42 | DES_encrypt1((DES_LONG *)tin, schedule, DES_ENCRYPT);
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| 43 | tout0 = tin[0];
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| 44 | tout1 = tin[1];
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| 45 | xor0 = sin0 ^ tout0;
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| 46 | xor1 = sin1 ^ tout1;
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| 47 | l2c(tout0, out);
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| 48 | l2c(tout1, out);
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| 49 | }
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| 50 | } else {
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| 51 | c2l(iv, xor0);
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| 52 | c2l(iv, xor1);
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| 53 | for (; length > 0; length -= 8) {
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| 54 | c2l(in, sin0);
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| 55 | c2l(in, sin1);
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| 56 | tin[0] = sin0;
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| 57 | tin[1] = sin1;
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| 58 | DES_encrypt1((DES_LONG *)tin, schedule, DES_DECRYPT);
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| 59 | tout0 = tin[0] ^ xor0;
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| 60 | tout1 = tin[1] ^ xor1;
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| 61 | if (length >= 8) {
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| 62 | l2c(tout0, out);
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| 63 | l2c(tout1, out);
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| 64 | } else
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| 65 | l2cn(tout0, tout1, out, length);
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| 66 | xor0 = tout0 ^ sin0;
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| 67 | xor1 = tout1 ^ sin1;
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| 68 | }
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| 69 | }
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| 70 | tin[0] = tin[1] = 0;
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| 71 | sin0 = sin1 = xor0 = xor1 = tout0 = tout1 = 0;
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| 72 | }
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