1e1051a39Sopenharmony_ci/* 2e1051a39Sopenharmony_ci * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved. 3e1051a39Sopenharmony_ci * 4e1051a39Sopenharmony_ci * Licensed under the Apache License 2.0 (the "License"). You may not use 5e1051a39Sopenharmony_ci * this file except in compliance with the License. You can obtain a copy 6e1051a39Sopenharmony_ci * in the file LICENSE in the source distribution or at 7e1051a39Sopenharmony_ci * https://www.openssl.org/source/license.html 8e1051a39Sopenharmony_ci */ 9e1051a39Sopenharmony_ci 10e1051a39Sopenharmony_ci/* 11e1051a39Sopenharmony_ci * IDEA low level APIs are deprecated for public use, but still ok for internal 12e1051a39Sopenharmony_ci * use where we're using them to implement the higher level EVP interface, as is 13e1051a39Sopenharmony_ci * the case here. 14e1051a39Sopenharmony_ci */ 15e1051a39Sopenharmony_ci#include "internal/deprecated.h" 16e1051a39Sopenharmony_ci 17e1051a39Sopenharmony_ci#include <openssl/idea.h> 18e1051a39Sopenharmony_ci#include "idea_local.h" 19e1051a39Sopenharmony_ci 20e1051a39Sopenharmony_ci/* 21e1051a39Sopenharmony_ci * The input and output encrypted as though 64bit cfb mode is being used. 22e1051a39Sopenharmony_ci * The extra state information to record how much of the 64bit block we have 23e1051a39Sopenharmony_ci * used is contained in *num; 24e1051a39Sopenharmony_ci */ 25e1051a39Sopenharmony_ci 26e1051a39Sopenharmony_civoid IDEA_cfb64_encrypt(const unsigned char *in, unsigned char *out, 27e1051a39Sopenharmony_ci long length, IDEA_KEY_SCHEDULE *schedule, 28e1051a39Sopenharmony_ci unsigned char *ivec, int *num, int encrypt) 29e1051a39Sopenharmony_ci{ 30e1051a39Sopenharmony_ci register unsigned long v0, v1, t; 31e1051a39Sopenharmony_ci register int n = *num; 32e1051a39Sopenharmony_ci register long l = length; 33e1051a39Sopenharmony_ci unsigned long ti[2]; 34e1051a39Sopenharmony_ci unsigned char *iv, c, cc; 35e1051a39Sopenharmony_ci 36e1051a39Sopenharmony_ci if (n < 0) { 37e1051a39Sopenharmony_ci *num = -1; 38e1051a39Sopenharmony_ci return; 39e1051a39Sopenharmony_ci } 40e1051a39Sopenharmony_ci 41e1051a39Sopenharmony_ci iv = (unsigned char *)ivec; 42e1051a39Sopenharmony_ci if (encrypt) { 43e1051a39Sopenharmony_ci while (l--) { 44e1051a39Sopenharmony_ci if (n == 0) { 45e1051a39Sopenharmony_ci n2l(iv, v0); 46e1051a39Sopenharmony_ci ti[0] = v0; 47e1051a39Sopenharmony_ci n2l(iv, v1); 48e1051a39Sopenharmony_ci ti[1] = v1; 49e1051a39Sopenharmony_ci IDEA_encrypt((unsigned long *)ti, schedule); 50e1051a39Sopenharmony_ci iv = (unsigned char *)ivec; 51e1051a39Sopenharmony_ci t = ti[0]; 52e1051a39Sopenharmony_ci l2n(t, iv); 53e1051a39Sopenharmony_ci t = ti[1]; 54e1051a39Sopenharmony_ci l2n(t, iv); 55e1051a39Sopenharmony_ci iv = (unsigned char *)ivec; 56e1051a39Sopenharmony_ci } 57e1051a39Sopenharmony_ci c = *(in++) ^ iv[n]; 58e1051a39Sopenharmony_ci *(out++) = c; 59e1051a39Sopenharmony_ci iv[n] = c; 60e1051a39Sopenharmony_ci n = (n + 1) & 0x07; 61e1051a39Sopenharmony_ci } 62e1051a39Sopenharmony_ci } else { 63e1051a39Sopenharmony_ci while (l--) { 64e1051a39Sopenharmony_ci if (n == 0) { 65e1051a39Sopenharmony_ci n2l(iv, v0); 66e1051a39Sopenharmony_ci ti[0] = v0; 67e1051a39Sopenharmony_ci n2l(iv, v1); 68e1051a39Sopenharmony_ci ti[1] = v1; 69e1051a39Sopenharmony_ci IDEA_encrypt((unsigned long *)ti, schedule); 70e1051a39Sopenharmony_ci iv = (unsigned char *)ivec; 71e1051a39Sopenharmony_ci t = ti[0]; 72e1051a39Sopenharmony_ci l2n(t, iv); 73e1051a39Sopenharmony_ci t = ti[1]; 74e1051a39Sopenharmony_ci l2n(t, iv); 75e1051a39Sopenharmony_ci iv = (unsigned char *)ivec; 76e1051a39Sopenharmony_ci } 77e1051a39Sopenharmony_ci cc = *(in++); 78e1051a39Sopenharmony_ci c = iv[n]; 79e1051a39Sopenharmony_ci iv[n] = cc; 80e1051a39Sopenharmony_ci *(out++) = c ^ cc; 81e1051a39Sopenharmony_ci n = (n + 1) & 0x07; 82e1051a39Sopenharmony_ci } 83e1051a39Sopenharmony_ci } 84e1051a39Sopenharmony_ci v0 = v1 = ti[0] = ti[1] = t = c = cc = 0; 85e1051a39Sopenharmony_ci *num = n; 86e1051a39Sopenharmony_ci} 87