160 lines
4.1 KiB
C
160 lines
4.1 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 <stdio.h>
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#include <openssl/rc5.h>
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#include "rc5_locl.h"
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void RC5_32_cbc_encrypt(const unsigned char *in, unsigned char *out,
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long length, RC5_32_KEY *ks, unsigned char *iv,
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int encrypt)
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{
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register unsigned long tin0, tin1;
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register unsigned long tout0, tout1, xor0, xor1;
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register long l = length;
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unsigned long tin[2];
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if (encrypt) {
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c2l(iv, tout0);
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c2l(iv, tout1);
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iv -= 8;
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for (l -= 8; l >= 0; l -= 8) {
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c2l(in, tin0);
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c2l(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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RC5_32_encrypt(tin, ks);
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tout0 = tin[0];
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l2c(tout0, out);
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tout1 = tin[1];
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l2c(tout1, out);
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}
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if (l != -8) {
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c2ln(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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RC5_32_encrypt(tin, ks);
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tout0 = tin[0];
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l2c(tout0, out);
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tout1 = tin[1];
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l2c(tout1, out);
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}
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l2c(tout0, iv);
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l2c(tout1, iv);
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} else {
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c2l(iv, xor0);
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c2l(iv, xor1);
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iv -= 8;
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for (l -= 8; l >= 0; l -= 8) {
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c2l(in, tin0);
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tin[0] = tin0;
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c2l(in, tin1);
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tin[1] = tin1;
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RC5_32_decrypt(tin, ks);
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tout0 = tin[0] ^ xor0;
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tout1 = tin[1] ^ xor1;
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l2c(tout0, out);
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l2c(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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c2l(in, tin0);
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tin[0] = tin0;
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c2l(in, tin1);
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tin[1] = tin1;
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RC5_32_decrypt(tin, ks);
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tout0 = tin[0] ^ xor0;
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tout1 = tin[1] ^ xor1;
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l2cn(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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l2c(xor0, iv);
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l2c(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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void RC5_32_encrypt(unsigned long *d, RC5_32_KEY *key)
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{
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RC5_32_INT a, b, *s;
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s = key->data;
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a = d[0] + s[0];
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b = d[1] + s[1];
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E_RC5_32(a, b, s, 2);
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E_RC5_32(a, b, s, 4);
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E_RC5_32(a, b, s, 6);
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E_RC5_32(a, b, s, 8);
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E_RC5_32(a, b, s, 10);
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E_RC5_32(a, b, s, 12);
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E_RC5_32(a, b, s, 14);
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E_RC5_32(a, b, s, 16);
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if (key->rounds == 12) {
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E_RC5_32(a, b, s, 18);
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E_RC5_32(a, b, s, 20);
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E_RC5_32(a, b, s, 22);
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E_RC5_32(a, b, s, 24);
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} else if (key->rounds == 16) {
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/* Do a full expansion to avoid a jump */
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E_RC5_32(a, b, s, 18);
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E_RC5_32(a, b, s, 20);
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E_RC5_32(a, b, s, 22);
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E_RC5_32(a, b, s, 24);
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E_RC5_32(a, b, s, 26);
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E_RC5_32(a, b, s, 28);
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E_RC5_32(a, b, s, 30);
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E_RC5_32(a, b, s, 32);
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}
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d[0] = a;
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d[1] = b;
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}
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void RC5_32_decrypt(unsigned long *d, RC5_32_KEY *key)
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{
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RC5_32_INT a, b, *s;
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s = key->data;
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a = d[0];
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b = d[1];
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if (key->rounds == 16) {
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D_RC5_32(a, b, s, 32);
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D_RC5_32(a, b, s, 30);
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D_RC5_32(a, b, s, 28);
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D_RC5_32(a, b, s, 26);
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/* Do a full expansion to avoid a jump */
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D_RC5_32(a, b, s, 24);
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D_RC5_32(a, b, s, 22);
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D_RC5_32(a, b, s, 20);
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D_RC5_32(a, b, s, 18);
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} else if (key->rounds == 12) {
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D_RC5_32(a, b, s, 24);
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D_RC5_32(a, b, s, 22);
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D_RC5_32(a, b, s, 20);
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D_RC5_32(a, b, s, 18);
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}
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D_RC5_32(a, b, s, 16);
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D_RC5_32(a, b, s, 14);
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D_RC5_32(a, b, s, 12);
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D_RC5_32(a, b, s, 10);
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D_RC5_32(a, b, s, 8);
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D_RC5_32(a, b, s, 6);
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D_RC5_32(a, b, s, 4);
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D_RC5_32(a, b, s, 2);
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d[0] = a - s[0];
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d[1] = b - s[1];
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}
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