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 */ 58