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
  19 struct des_ctx {
  20         u32 expkey[DES_EXPKEY_WORDS];
  21 };
  22
  23 struct des3_ede_ctx {
  24         u32 expkey[DES3_EDE_EXPKEY_WORDS];
  25 };
  26
  27 void des_encrypt(const struct des_ctx *ctx, u8 *dst, const u8 *src);
  28 void des_decrypt(const struct des_ctx *ctx, u8 *dst, const u8 *src);
  29
  30 void des3_ede_encrypt(const struct des3_ede_ctx *dctx, u8 *dst, const u8 *src);
  31 void 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  */
  42 int 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  */
  54 int des3_ede_expand_key(struct des3_ede_ctx *ctx, const u8 *key,
  55                         unsigned int keylen);
  56
  57 #endif /* __CRYPTO_DES_H */