LXR linux/include/crypto/des.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/* 
   3 * DES & Triple DES EDE Cipher Algorithms.
   4 */
   5
   6#ifndef __CRYPTO_DES_H
   7#define __CRYPTO_DES_H
   8
   9#include <linux/types.h>
  10
  11#define DES_KEY_SIZE            8
  12#define DES_EXPKEY_WORDS        32
  13#define DES_BLOCK_SIZE          8
  14
  15#define DES3_EDE_KEY_SIZE       (3 * DES_KEY_SIZE)
  16#define DES3_EDE_EXPKEY_WORDS   (3 * DES_EXPKEY_WORDS)
  17#define DES3_EDE_BLOCK_SIZE     DES_BLOCK_SIZE
  18
  19struct des_ctx {
  20        u32 expkey[DES_EXPKEY_WORDS];
  21};
  22
  23struct des3_ede_ctx {
  24        u32 expkey[DES3_EDE_EXPKEY_WORDS];
  25};
  26
  27void des_encrypt(const struct des_ctx *ctx, u8 *dst, const u8 *src);
  28void des_decrypt(const struct des_ctx *ctx, u8 *dst, const u8 *src);
  29
  30void des3_ede_encrypt(const struct des3_ede_ctx *dctx, u8 *dst, const u8 *src);
  31void des3_ede_decrypt(const struct des3_ede_ctx *dctx, u8 *dst, const u8 *src);
  32
  33/**
  34 * des_expand_key - Expand a DES input key into a key schedule
  35 * @ctx: the key schedule
  36 * @key: buffer containing the input key
  37 * @len: size of the buffer contents
  38 *
  39 * Returns 0 on success, -EINVAL if the input key is rejected and -ENOKEY if
  40 * the key is accepted but has been found to be weak.
  41 */
  42int des_expand_key(struct des_ctx *ctx, const u8 *key, unsigned int keylen);
  43
  44/**
  45 * des3_ede_expand_key - Expand a triple DES input key into a key schedule
  46 * @ctx: the key schedule
  47 * @key: buffer containing the input key
  48 * @len: size of the buffer contents
  49 *
  50 * Returns 0 on success, -EINVAL if the input key is rejected and -ENOKEY if
  51 * the key is accepted but has been found to be weak. Note that weak keys will
  52 * be rejected (and -EINVAL will be returned) when running in FIPS mode.
  53 */
  54int des3_ede_expand_key(struct des3_ede_ctx *ctx, const u8 *key,
  55                        unsigned int keylen);
  56
  57#endif /* __CRYPTO_DES_H */
  58