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- /*
- * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the Apache License 2.0 (the "License"). You may not use
- * this file except in compliance with the License. You can obtain a copy
- * in the file LICENSE in the source distribution or at
- * https://www.openssl.org/source/license.html
- */
- /*
- * RC5 low level APIs are deprecated for public use, but still ok for internal
- * use.
- */
- #include "internal/deprecated.h"
- #include <stdio.h>
- #include <openssl/rc5.h>
- #include "rc5_local.h"
- void RC5_32_cbc_encrypt(const unsigned char *in, unsigned char *out,
- long length, RC5_32_KEY *ks, unsigned char *iv,
- int encrypt)
- {
- register unsigned long tin0, tin1;
- register unsigned long tout0, tout1, xor0, xor1;
- register long l = length;
- unsigned long tin[2];
- if (encrypt) {
- c2l(iv, tout0);
- c2l(iv, tout1);
- iv -= 8;
- for (l -= 8; l >= 0; l -= 8) {
- c2l(in, tin0);
- c2l(in, tin1);
- tin0 ^= tout0;
- tin1 ^= tout1;
- tin[0] = tin0;
- tin[1] = tin1;
- RC5_32_encrypt(tin, ks);
- tout0 = tin[0];
- l2c(tout0, out);
- tout1 = tin[1];
- l2c(tout1, out);
- }
- if (l != -8) {
- c2ln(in, tin0, tin1, l + 8);
- tin0 ^= tout0;
- tin1 ^= tout1;
- tin[0] = tin0;
- tin[1] = tin1;
- RC5_32_encrypt(tin, ks);
- tout0 = tin[0];
- l2c(tout0, out);
- tout1 = tin[1];
- l2c(tout1, out);
- }
- l2c(tout0, iv);
- l2c(tout1, iv);
- } else {
- c2l(iv, xor0);
- c2l(iv, xor1);
- iv -= 8;
- for (l -= 8; l >= 0; l -= 8) {
- c2l(in, tin0);
- tin[0] = tin0;
- c2l(in, tin1);
- tin[1] = tin1;
- RC5_32_decrypt(tin, ks);
- tout0 = tin[0] ^ xor0;
- tout1 = tin[1] ^ xor1;
- l2c(tout0, out);
- l2c(tout1, out);
- xor0 = tin0;
- xor1 = tin1;
- }
- if (l != -8) {
- c2l(in, tin0);
- tin[0] = tin0;
- c2l(in, tin1);
- tin[1] = tin1;
- RC5_32_decrypt(tin, ks);
- tout0 = tin[0] ^ xor0;
- tout1 = tin[1] ^ xor1;
- l2cn(tout0, tout1, out, l + 8);
- xor0 = tin0;
- xor1 = tin1;
- }
- l2c(xor0, iv);
- l2c(xor1, iv);
- }
- tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
- tin[0] = tin[1] = 0;
- }
- void RC5_32_encrypt(unsigned long *d, RC5_32_KEY *key)
- {
- RC5_32_INT a, b, *s;
- s = key->data;
- a = d[0] + s[0];
- b = d[1] + s[1];
- E_RC5_32(a, b, s, 2);
- E_RC5_32(a, b, s, 4);
- E_RC5_32(a, b, s, 6);
- E_RC5_32(a, b, s, 8);
- E_RC5_32(a, b, s, 10);
- E_RC5_32(a, b, s, 12);
- E_RC5_32(a, b, s, 14);
- E_RC5_32(a, b, s, 16);
- if (key->rounds == 12) {
- E_RC5_32(a, b, s, 18);
- E_RC5_32(a, b, s, 20);
- E_RC5_32(a, b, s, 22);
- E_RC5_32(a, b, s, 24);
- } else if (key->rounds == 16) {
- /* Do a full expansion to avoid a jump */
- E_RC5_32(a, b, s, 18);
- E_RC5_32(a, b, s, 20);
- E_RC5_32(a, b, s, 22);
- E_RC5_32(a, b, s, 24);
- E_RC5_32(a, b, s, 26);
- E_RC5_32(a, b, s, 28);
- E_RC5_32(a, b, s, 30);
- E_RC5_32(a, b, s, 32);
- }
- d[0] = a;
- d[1] = b;
- }
- void RC5_32_decrypt(unsigned long *d, RC5_32_KEY *key)
- {
- RC5_32_INT a, b, *s;
- s = key->data;
- a = d[0];
- b = d[1];
- if (key->rounds == 16) {
- D_RC5_32(a, b, s, 32);
- D_RC5_32(a, b, s, 30);
- D_RC5_32(a, b, s, 28);
- D_RC5_32(a, b, s, 26);
- /* Do a full expansion to avoid a jump */
- D_RC5_32(a, b, s, 24);
- D_RC5_32(a, b, s, 22);
- D_RC5_32(a, b, s, 20);
- D_RC5_32(a, b, s, 18);
- } else if (key->rounds == 12) {
- D_RC5_32(a, b, s, 24);
- D_RC5_32(a, b, s, 22);
- D_RC5_32(a, b, s, 20);
- D_RC5_32(a, b, s, 18);
- }
- D_RC5_32(a, b, s, 16);
- D_RC5_32(a, b, s, 14);
- D_RC5_32(a, b, s, 12);
- D_RC5_32(a, b, s, 10);
- D_RC5_32(a, b, s, 8);
- D_RC5_32(a, b, s, 6);
- D_RC5_32(a, b, s, 4);
- D_RC5_32(a, b, s, 2);
- d[0] = a - s[0];
- d[1] = b - s[1];
- }
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