| /* arctwo.h --- The arctwo block cipher |
| * Copyright (C) 2000-2003, 2005, 2009-2020 Free Software Foundation, Inc. |
| * |
| * This file is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published |
| * by the Free Software Foundation; either version 2, or (at your |
| * option) any later version. |
| * |
| * This file is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this file; if not, see <https://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| /* Code from Libgcrypt adapted for gnulib by Simon Josefsson. */ |
| |
| #ifndef ARCTWO_H |
| # define ARCTWO_H |
| |
| # include <stddef.h> |
| # include <stdint.h> |
| |
| typedef struct |
| { |
| uint16_t S[64]; |
| } arctwo_context; |
| |
| #define ARCTWO_BLOCK_SIZE 8 |
| |
| /* Initialize CONTEXT using KEY of KEYLEN length. If |
| EFFECTIVE_KEYLEN, truncate the key (using a special algorithm) to |
| only be of EFFECTIVE_KEYLEN bits. Normally, you use |
| EFFECTIVE_KEYLEN of 0, but see RFC 2268 for more information. */ |
| void |
| arctwo_setkey_ekb (arctwo_context *context, |
| size_t keylen, const char *key, size_t effective_keylen); |
| |
| #define arctwo_setkey(context,keylen,key) \ |
| arctwo_setkey_ekb (context, keylen, key, 8 * (keylen)) |
| |
| /* Encrypt INBUF of size LENGTH into OUTBUF. LENGTH must be a |
| multiple of ARCTWO_BLOCK_SIZE. CONTEXT hold the encryption key, |
| and must have been initialized with arctwo_setkey or |
| arctwo_setkey_ekb. */ |
| extern void |
| arctwo_encrypt (arctwo_context *context, const char *inbuf, |
| char *restrict outbuf, size_t length); |
| |
| /* Decrypt INBUF of size LENGTH into OUTBUF. LENGTH must be a |
| multiple of ARCTWO_BLOCK_SIZE. CONTEXT hold the decryption key, |
| and must have been initialized with arctwo_setkey or |
| arctwo_setkey_ekb. */ |
| extern void |
| arctwo_decrypt (arctwo_context *context, const char *inbuf, |
| char *restrict outbuf, size_t length); |
| |
| #endif /* ARCTWO_H */ |