163 lines
4.9 KiB
C
163 lines
4.9 KiB
C
/* des-compat.h
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The des block cipher, old libdes/openssl-style interface.
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Copyright (C) 2001 Niels Möller
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This file is part of GNU Nettle.
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GNU Nettle is free software: you can redistribute it and/or
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modify it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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or both in parallel, as here.
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GNU Nettle is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see http://www.gnu.org/licenses/.
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*/
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#ifndef NETTLE_DES_COMPAT_H_INCLUDED
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#define NETTLE_DES_COMPAT_H_INCLUDED
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/* According to Assar, des_set_key, des_set_key_odd_parity,
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* des_is_weak_key, plus the encryption functions (des_*_encrypt and
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* des_cbc_cksum) would be a pretty useful subset. */
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/* NOTE: This is quite experimental, and not all functions are
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* implemented. Contributions, in particular test cases are welcome. */
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#include "des.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* We use some name mangling, to avoid collisions with either other
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* nettle functions or with libcrypto. */
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#define des_ecb3_encrypt nettle_openssl_des_ecb3_encrypt
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#define des_cbc_cksum nettle_openssl_des_cbc_cksum
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#define des_ncbc_encrypt nettle_openssl_des_ncbc_encrypt
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#define des_cbc_encrypt nettle_openssl_des_cbc_encrypt
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#define des_ecb_encrypt nettle_openssl_des_ecb_encrypt
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#define des_ede3_cbc_encrypt nettle_openssl_des_ede3_cbc_encrypt
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#define des_set_odd_parity nettle_openssl_des_set_odd_parity
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#define des_check_key nettle_openssl_des_check_key
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#define des_key_sched nettle_openssl_des_key_sched
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#define des_is_weak_key nettle_openssl_des_is_weak_key
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/* An extra alias */
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#undef des_set_key
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#define des_set_key nettle_openssl_des_key_sched
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enum { DES_DECRYPT = 0, DES_ENCRYPT = 1 };
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/* Types */
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typedef uint32_t DES_LONG;
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/* Note: Typedef:ed arrays should be avoided, but they're used here
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* for compatibility. */
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typedef struct des_ctx des_key_schedule[1];
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typedef uint8_t des_cblock[DES_BLOCK_SIZE];
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/* Note: The proper definition,
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typedef const uint8_t const_des_cblock[DES_BLOCK_SIZE];
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would have worked, *if* all the prototypes had used arguments like
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foo(const_des_cblock src, des_cblock dst), letting argument arrays
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"decay" into pointers of type uint8_t * and const uint8_t *.
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But since openssl's prototypes use *pointers* const_des_cblock *src,
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des_cblock *dst, this ends up in type conflicts, and the workaround
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is to not use const at all.
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*/
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#define const_des_cblock des_cblock
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/* Aliases */
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#define des_ecb2_encrypt(i,o,k1,k2,e) \
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des_ecb3_encrypt((i),(o),(k1),(k2),(k1),(e))
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#define des_ede2_cbc_encrypt(i,o,l,k1,k2,iv,e) \
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des_ede3_cbc_encrypt((i),(o),(l),(k1),(k2),(k1),(iv),(e))
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/* Global flag */
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extern int des_check_key;
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/* Prototypes */
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/* Typing is a little confusing. Since both des_cblock and
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des_key_schedule are typedef:ed arrays, it automatically decay to
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a pointers.
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But the functions are declared taking pointers to des_cblock, i.e.
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pointers to arrays. And on the other hand, they take plain
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des_key_schedule arguments, which is equivalent to pointers to
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struct des_ctx. */
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void
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des_ecb3_encrypt(const_des_cblock *src, des_cblock *dst,
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des_key_schedule k1,
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des_key_schedule k2,
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des_key_schedule k3, int enc);
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/* des_cbc_cksum in libdes returns a 32 bit integer, representing the
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* latter half of the output block, using little endian byte order. */
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uint32_t
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des_cbc_cksum(const uint8_t *src, des_cblock *dst,
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long length, des_key_schedule ctx,
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const_des_cblock *iv);
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/* NOTE: Doesn't update iv. */
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void
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des_cbc_encrypt(const_des_cblock *src, des_cblock *dst, long length,
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des_key_schedule ctx, const_des_cblock *iv,
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int enc);
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/* Similar, but updates iv. */
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void
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des_ncbc_encrypt(const_des_cblock *src, des_cblock *dst, long length,
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des_key_schedule ctx, des_cblock *iv,
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int enc);
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void
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des_ecb_encrypt(const_des_cblock *src, des_cblock *dst,
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des_key_schedule ctx, int enc);
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void
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des_ede3_cbc_encrypt(const_des_cblock *src, des_cblock *dst, long length,
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des_key_schedule k1,
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des_key_schedule k2,
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des_key_schedule k3,
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des_cblock *iv,
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int enc);
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int
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des_set_odd_parity(des_cblock *key);
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int
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des_key_sched(const_des_cblock *key, des_key_schedule ctx);
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int
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des_is_weak_key(const_des_cblock *key);
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#ifdef __cplusplus
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}
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#endif
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#endif /* NETTLE_DES_COMPAT_H_INCLUDED */
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