1 /* 2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 /* 11 * RC5 low level APIs are deprecated for public use, but still ok for internal 12 * use. 13 */ 14 #include "internal/deprecated.h" 15 16 #include <openssl/rc5.h> 17 #include "rc5_local.h" 18 19 /* 20 * The input and output encrypted as though 64bit ofb mode is being used. 21 * The extra state information to record how much of the 64bit block we have 22 * used is contained in *num; 23 */ 24 void RC5_32_ofb64_encrypt(const unsigned char *in, unsigned char *out, 25 long length, RC5_32_KEY *schedule, 26 unsigned char *ivec, int *num) 27 { 28 register unsigned long v0, v1, t; 29 register int n = *num; 30 register long l = length; 31 unsigned char d[8]; 32 register char *dp; 33 unsigned long ti[2]; 34 unsigned char *iv; 35 int save = 0; 36 37 iv = (unsigned char *)ivec; 38 c2l(iv, v0); 39 c2l(iv, v1); 40 ti[0] = v0; 41 ti[1] = v1; 42 dp = (char *)d; 43 l2c(v0, dp); 44 l2c(v1, dp); 45 while (l--) { 46 if (n == 0) { 47 RC5_32_encrypt((unsigned long *)ti, schedule); 48 dp = (char *)d; 49 t = ti[0]; 50 l2c(t, dp); 51 t = ti[1]; 52 l2c(t, dp); 53 save++; 54 } 55 *(out++) = *(in++) ^ d[n]; 56 n = (n + 1) & 0x07; 57 } 58 if (save) { 59 v0 = ti[0]; 60 v1 = ti[1]; 61 iv = (unsigned char *)ivec; 62 l2c(v0, iv); 63 l2c(v1, iv); 64 } 65 t = v0 = v1 = ti[0] = ti[1] = 0; 66 *num = n; 67 } 68