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73 lines
2 KiB
C
73 lines
2 KiB
C
/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include "des_local.h"
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/*
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* The input and output encrypted as though 64bit cfb mode is being used.
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* The extra state information to record how much of the 64bit block we have
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* used is contained in *num;
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*/
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void DES_cfb64_encrypt(const unsigned char *in, unsigned char *out,
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long length, DES_key_schedule *schedule,
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DES_cblock *ivec, int *num, int enc)
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{
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register DES_LONG v0, v1;
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register long l = length;
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register int n = *num;
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DES_LONG ti[2];
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unsigned char *iv, c, cc;
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iv = &(*ivec)[0];
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if (enc) {
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while (l--) {
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if (n == 0) {
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c2l(iv, v0);
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ti[0] = v0;
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c2l(iv, v1);
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ti[1] = v1;
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DES_encrypt1(ti, schedule, DES_ENCRYPT);
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iv = &(*ivec)[0];
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v0 = ti[0];
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l2c(v0, iv);
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v0 = ti[1];
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l2c(v0, iv);
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iv = &(*ivec)[0];
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}
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c = *(in++) ^ iv[n];
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*(out++) = c;
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iv[n] = c;
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n = (n + 1) & 0x07;
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}
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} else {
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while (l--) {
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if (n == 0) {
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c2l(iv, v0);
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ti[0] = v0;
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c2l(iv, v1);
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ti[1] = v1;
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DES_encrypt1(ti, schedule, DES_ENCRYPT);
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iv = &(*ivec)[0];
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v0 = ti[0];
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l2c(v0, iv);
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v0 = ti[1];
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l2c(v0, iv);
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iv = &(*ivec)[0];
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}
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cc = *(in++);
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c = iv[n];
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iv[n] = cc;
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*(out++) = c ^ cc;
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n = (n + 1) & 0x07;
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}
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}
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v0 = v1 = ti[0] = ti[1] = c = cc = 0;
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*num = n;
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}
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