75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Common values for AES algorithms
|
|
*/
|
|
|
|
#ifndef _CRYPTO_AES_H
|
|
#define _CRYPTO_AES_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/crypto.h>
|
|
|
|
#define AES_MIN_KEY_SIZE 16
|
|
#define AES_MAX_KEY_SIZE 32
|
|
#define AES_KEYSIZE_128 16
|
|
#define AES_KEYSIZE_192 24
|
|
#define AES_KEYSIZE_256 32
|
|
#define AES_BLOCK_SIZE 16
|
|
#define AES_MAX_KEYLENGTH (15 * 16)
|
|
#define AES_MAX_KEYLENGTH_U32 (AES_MAX_KEYLENGTH / sizeof(u32))
|
|
|
|
/*
|
|
* Please ensure that the first two fields are 16-byte aligned
|
|
* relative to the start of the structure, i.e., don't move them!
|
|
*/
|
|
struct crypto_aes_ctx {
|
|
u32 key_enc[AES_MAX_KEYLENGTH_U32];
|
|
u32 key_dec[AES_MAX_KEYLENGTH_U32];
|
|
u32 key_length;
|
|
};
|
|
|
|
extern const u32 crypto_ft_tab[4][256] ____cacheline_aligned;
|
|
extern const u32 crypto_fl_tab[4][256] ____cacheline_aligned;
|
|
extern const u32 crypto_it_tab[4][256] ____cacheline_aligned;
|
|
extern const u32 crypto_il_tab[4][256] ____cacheline_aligned;
|
|
|
|
int crypto_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
|
|
unsigned int key_len);
|
|
int crypto_aes_expand_key(struct crypto_aes_ctx *ctx, const u8 *in_key,
|
|
unsigned int key_len);
|
|
|
|
/**
|
|
* aes_expandkey - Expands the AES key as described in FIPS-197
|
|
* @ctx: The location where the computed key will be stored.
|
|
* @in_key: The supplied key.
|
|
* @key_len: The length of the supplied key.
|
|
*
|
|
* Returns 0 on success. The function fails only if an invalid key size (or
|
|
* pointer) is supplied.
|
|
* The expanded key size is 240 bytes (max of 14 rounds with a unique 16 bytes
|
|
* key schedule plus a 16 bytes key which is used before the first round).
|
|
* The decryption key is prepared for the "Equivalent Inverse Cipher" as
|
|
* described in FIPS-197. The first slot (16 bytes) of each key (enc or dec) is
|
|
* for the initial combination, the second slot for the first round and so on.
|
|
*/
|
|
int aes_expandkey(struct crypto_aes_ctx *ctx, const u8 *in_key,
|
|
unsigned int key_len);
|
|
|
|
/**
|
|
* aes_encrypt - Encrypt a single AES block
|
|
* @ctx: Context struct containing the key schedule
|
|
* @out: Buffer to store the ciphertext
|
|
* @in: Buffer containing the plaintext
|
|
*/
|
|
void aes_encrypt(const struct crypto_aes_ctx *ctx, u8 *out, const u8 *in);
|
|
|
|
/**
|
|
* aes_decrypt - Decrypt a single AES block
|
|
* @ctx: Context struct containing the key schedule
|
|
* @out: Buffer to store the plaintext
|
|
* @in: Buffer containing the ciphertext
|
|
*/
|
|
void aes_decrypt(const struct crypto_aes_ctx *ctx, u8 *out, const u8 *in);
|
|
|
|
#endif
|