| 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/rc5.h> |
| 11 | #include "rc5_local.h" |
| 12 | |
| 13 | /* |
| 14 | * The input and output encrypted as though 64bit cfb 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 | |
| 19 | void RC5_32_cfb64_encrypt(const unsigned char *in, unsigned char *out, |
| 20 | long length, RC5_32_KEY *schedule, |
| 21 | unsigned char *ivec, int *num, int encrypt) |
| 22 | { |
| 23 | register unsigned long v0, v1, t; |
| 24 | register int n = *num; |
| 25 | register long l = length; |
| 26 | unsigned long ti[2]; |
| 27 | unsigned char *iv, c, cc; |
| 28 | |
| 29 | iv = (unsigned char *)ivec; |
| 30 | if (encrypt) { |
| 31 | while (l--) { |
| 32 | if (n == 0) { |
| 33 | c2l(iv, v0); |
| 34 | ti[0] = v0; |
| 35 | c2l(iv, v1); |
| 36 | ti[1] = v1; |
| 37 | RC5_32_encrypt((unsigned long *)ti, schedule); |
| 38 | iv = (unsigned char *)ivec; |
| 39 | t = ti[0]; |
| 40 | l2c(t, iv); |
| 41 | t = ti[1]; |
| 42 | l2c(t, iv); |
| 43 | iv = (unsigned char *)ivec; |
| 44 | } |
| 45 | c = *(in++) ^ iv[n]; |
| 46 | *(out++) = c; |
| 47 | iv[n] = c; |
| 48 | n = (n + 1) & 0x07; |
| 49 | } |
| 50 | } else { |
| 51 | while (l--) { |
| 52 | if (n == 0) { |
| 53 | c2l(iv, v0); |
| 54 | ti[0] = v0; |
| 55 | c2l(iv, v1); |
| 56 | ti[1] = v1; |
| 57 | RC5_32_encrypt((unsigned long *)ti, schedule); |
| 58 | iv = (unsigned char *)ivec; |
| 59 | t = ti[0]; |
| 60 | l2c(t, iv); |
| 61 | t = ti[1]; |
| 62 | l2c(t, iv); |
| 63 | iv = (unsigned char *)ivec; |
| 64 | } |
| 65 | cc = *(in++); |
| 66 | c = iv[n]; |
| 67 | iv[n] = cc; |
| 68 | *(out++) = c ^ cc; |
| 69 | n = (n + 1) & 0x07; |
| 70 | } |
| 71 | } |
| 72 | v0 = v1 = ti[0] = ti[1] = t = c = cc = 0; |
| 73 | *num = n; |
| 74 | } |