| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. |
| 3 | * |
| 4 | * Licensed under the OpenSSL license (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 | #include <openssl/rc2.h> |
| 11 | #include "rc2_local.h" |
| 12 | |
| 13 | /* |
| 14 | * The input and output encrypted as though 64bit ofb mode is being used. |
| 15 | * The extra state information to record how much of the 64bit block we have |
| 16 | * used is contained in *num; |
| 17 | */ |
| 18 | void RC2_ofb64_encrypt(const unsigned char *in, unsigned char *out, |
| 19 | long length, RC2_KEY *schedule, unsigned char *ivec, |
| 20 | int *num) |
| 21 | { |
| 22 | register unsigned long v0, v1, t; |
| 23 | register int n = *num; |
| 24 | register long l = length; |
| 25 | unsigned char d[8]; |
| 26 | register char *dp; |
| 27 | unsigned long ti[2]; |
| 28 | unsigned char *iv; |
| 29 | int save = 0; |
| 30 | |
| 31 | iv = (unsigned char *)ivec; |
| 32 | c2l(iv, v0); |
| 33 | c2l(iv, v1); |
| 34 | ti[0] = v0; |
| 35 | ti[1] = v1; |
| 36 | dp = (char *)d; |
| 37 | l2c(v0, dp); |
| 38 | l2c(v1, dp); |
| 39 | while (l--) { |
| 40 | if (n == 0) { |
| 41 | RC2_encrypt((unsigned long *)ti, schedule); |
| 42 | dp = (char *)d; |
| 43 | t = ti[0]; |
| 44 | l2c(t, dp); |
| 45 | t = ti[1]; |
| 46 | l2c(t, dp); |
| 47 | save++; |
| 48 | } |
| 49 | *(out++) = *(in++) ^ d[n]; |
| 50 | n = (n + 1) & 0x07; |
| 51 | } |
| 52 | if (save) { |
| 53 | v0 = ti[0]; |
| 54 | v1 = ti[1]; |
| 55 | iv = (unsigned char *)ivec; |
| 56 | l2c(v0, iv); |
| 57 | l2c(v1, iv); |
| 58 | } |
| 59 | t = v0 = v1 = ti[0] = ti[1] = 0; |
| 60 | *num = n; |
| 61 | } |