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151 lines
4 KiB
C
151 lines
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/cast.h>
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#include "cast_lcl.h"
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void CAST_encrypt(CAST_LONG *data, const CAST_KEY *key)
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{
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CAST_LONG l, r, t;
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const CAST_LONG *k;
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k = &(key->data[0]);
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l = data[0];
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r = data[1];
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E_CAST(0, k, l, r, +, ^, -);
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E_CAST(1, k, r, l, ^, -, +);
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E_CAST(2, k, l, r, -, +, ^);
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E_CAST(3, k, r, l, +, ^, -);
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E_CAST(4, k, l, r, ^, -, +);
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E_CAST(5, k, r, l, -, +, ^);
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E_CAST(6, k, l, r, +, ^, -);
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E_CAST(7, k, r, l, ^, -, +);
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E_CAST(8, k, l, r, -, +, ^);
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E_CAST(9, k, r, l, +, ^, -);
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E_CAST(10, k, l, r, ^, -, +);
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E_CAST(11, k, r, l, -, +, ^);
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if (!key->short_key) {
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E_CAST(12, k, l, r, +, ^, -);
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E_CAST(13, k, r, l, ^, -, +);
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E_CAST(14, k, l, r, -, +, ^);
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E_CAST(15, k, r, l, +, ^, -);
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}
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data[1] = l & 0xffffffffL;
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data[0] = r & 0xffffffffL;
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}
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void CAST_decrypt(CAST_LONG *data, const CAST_KEY *key)
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{
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CAST_LONG l, r, t;
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const CAST_LONG *k;
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k = &(key->data[0]);
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l = data[0];
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r = data[1];
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if (!key->short_key) {
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E_CAST(15, k, l, r, +, ^, -);
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E_CAST(14, k, r, l, -, +, ^);
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E_CAST(13, k, l, r, ^, -, +);
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E_CAST(12, k, r, l, +, ^, -);
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}
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E_CAST(11, k, l, r, -, +, ^);
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E_CAST(10, k, r, l, ^, -, +);
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E_CAST(9, k, l, r, +, ^, -);
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E_CAST(8, k, r, l, -, +, ^);
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E_CAST(7, k, l, r, ^, -, +);
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E_CAST(6, k, r, l, +, ^, -);
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E_CAST(5, k, l, r, -, +, ^);
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E_CAST(4, k, r, l, ^, -, +);
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E_CAST(3, k, l, r, +, ^, -);
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E_CAST(2, k, r, l, -, +, ^);
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E_CAST(1, k, l, r, ^, -, +);
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E_CAST(0, k, r, l, +, ^, -);
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data[1] = l & 0xffffffffL;
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data[0] = r & 0xffffffffL;
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}
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void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out,
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long length, const CAST_KEY *ks, unsigned char *iv,
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int enc)
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{
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register CAST_LONG tin0, tin1;
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register CAST_LONG tout0, tout1, xor0, xor1;
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register long l = length;
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CAST_LONG tin[2];
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if (enc) {
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n2l(iv, tout0);
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n2l(iv, tout1);
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iv -= 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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CAST_encrypt(tin, ks);
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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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CAST_encrypt(tin, ks);
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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, iv);
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l2n(tout1, iv);
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} else {
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n2l(iv, xor0);
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n2l(iv, xor1);
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iv -= 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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CAST_decrypt(tin, ks);
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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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CAST_decrypt(tin, ks);
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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, iv);
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l2n(xor1, iv);
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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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