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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/des/xcbc_enc.c
2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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
14 void DES_xcbc_encrypt(const unsigned char *in
, unsigned char *out
,
15 long length
, DES_key_schedule
*schedule
,
16 DES_cblock
*ivec
, const_DES_cblock
*inw
,
17 const_DES_cblock
*outw
, int enc
)
19 register DES_LONG tin0
, tin1
;
20 register DES_LONG tout0
, tout1
, xor0
, xor1
;
21 register DES_LONG inW0
, inW1
, outW0
, outW1
;
22 register const unsigned char *in2
;
23 register long l
= length
;
39 for (l
-= 8; l
>= 0; l
-= 8) {
46 DES_encrypt1(tin
, schedule
, DES_ENCRYPT
);
47 tout0
= tin
[0] ^ outW0
;
49 tout1
= tin
[1] ^ outW1
;
53 c2ln(in
, tin0
, tin1
, l
+ 8);
58 DES_encrypt1(tin
, schedule
, DES_ENCRYPT
);
59 tout0
= tin
[0] ^ outW0
;
61 tout1
= tin
[1] ^ outW1
;
70 for (l
-= 8; l
> 0; l
-= 8) {
72 tin
[0] = tin0
^ outW0
;
74 tin
[1] = tin1
^ outW1
;
75 DES_encrypt1(tin
, schedule
, DES_DECRYPT
);
76 tout0
= tin
[0] ^ xor0
^ inW0
;
77 tout1
= tin
[1] ^ xor1
^ inW1
;
85 tin
[0] = tin0
^ outW0
;
87 tin
[1] = tin1
^ outW1
;
88 DES_encrypt1(tin
, schedule
, DES_DECRYPT
);
89 tout0
= tin
[0] ^ xor0
^ inW0
;
90 tout1
= tin
[1] ^ xor1
^ inW1
;
91 l2cn(tout0
, tout1
, out
, l
+ 8);
100 tin0
= tin1
= tout0
= tout1
= xor0
= xor1
= 0;
101 inW0
= inW1
= outW0
= outW1
= 0;