86 lines
2.4 KiB
C
86 lines
2.4 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 <openssl/blowfish.h>
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#include "bf_locl.h"
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void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
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const BF_KEY *schedule, unsigned char *ivec, int encrypt)
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{
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register BF_LONG tin0, tin1;
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register BF_LONG tout0, tout1, xor0, xor1;
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register long l = length;
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BF_LONG tin[2];
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if (encrypt) {
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n2l(ivec, tout0);
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n2l(ivec, tout1);
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ivec -= 8;
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for (l -= 8; l >= 0; l -= 8) {
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n2l(in, tin0);
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n2l(in, tin1);
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tin0 ^= tout0;
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tin1 ^= tout1;
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tin[0] = tin0;
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tin[1] = tin1;
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BF_encrypt(tin, schedule);
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tout0 = tin[0];
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tout1 = tin[1];
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l2n(tout0, out);
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l2n(tout1, out);
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}
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if (l != -8) {
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n2ln(in, tin0, tin1, l + 8);
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tin0 ^= tout0;
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tin1 ^= tout1;
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tin[0] = tin0;
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tin[1] = tin1;
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BF_encrypt(tin, schedule);
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tout0 = tin[0];
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tout1 = tin[1];
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l2n(tout0, out);
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l2n(tout1, out);
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}
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l2n(tout0, ivec);
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l2n(tout1, ivec);
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} else {
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n2l(ivec, xor0);
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n2l(ivec, xor1);
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ivec -= 8;
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for (l -= 8; l >= 0; l -= 8) {
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n2l(in, tin0);
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n2l(in, tin1);
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tin[0] = tin0;
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tin[1] = tin1;
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BF_decrypt(tin, schedule);
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tout0 = tin[0] ^ xor0;
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tout1 = tin[1] ^ xor1;
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l2n(tout0, out);
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l2n(tout1, out);
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xor0 = tin0;
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xor1 = tin1;
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}
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if (l != -8) {
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n2l(in, tin0);
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n2l(in, tin1);
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tin[0] = tin0;
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tin[1] = tin1;
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BF_decrypt(tin, schedule);
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tout0 = tin[0] ^ xor0;
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tout1 = tin[1] ^ xor1;
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l2nn(tout0, tout1, out, l + 8);
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xor0 = tin0;
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xor1 = tin1;
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}
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l2n(xor0, ivec);
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l2n(xor1, ivec);
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}
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tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
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tin[0] = tin[1] = 0;
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}
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