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bc67d04e75
Add inline helper function to check key length for AES algorithms. The key can be 128, 192 or 256 bits size. This function is used in the generic aes implementation. Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Common values for AES algorithms
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*/
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#ifndef _CRYPTO_AES_H
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#define _CRYPTO_AES_H
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#include <linux/types.h>
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#include <linux/crypto.h>
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#define AES_MIN_KEY_SIZE 16
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#define AES_MAX_KEY_SIZE 32
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#define AES_KEYSIZE_128 16
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#define AES_KEYSIZE_192 24
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#define AES_KEYSIZE_256 32
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#define AES_BLOCK_SIZE 16
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#define AES_MAX_KEYLENGTH (15 * 16)
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#define AES_MAX_KEYLENGTH_U32 (AES_MAX_KEYLENGTH / sizeof(u32))
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/*
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* Please ensure that the first two fields are 16-byte aligned
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* relative to the start of the structure, i.e., don't move them!
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*/
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struct crypto_aes_ctx {
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u32 key_enc[AES_MAX_KEYLENGTH_U32];
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u32 key_dec[AES_MAX_KEYLENGTH_U32];
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u32 key_length;
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};
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extern const u32 crypto_ft_tab[4][256] ____cacheline_aligned;
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extern const u32 crypto_it_tab[4][256] ____cacheline_aligned;
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/*
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* validate key length for AES algorithms
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*/
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static inline int aes_check_keylen(unsigned int keylen)
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{
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switch (keylen) {
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case AES_KEYSIZE_128:
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case AES_KEYSIZE_192:
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case AES_KEYSIZE_256:
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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int crypto_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
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unsigned int key_len);
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/**
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* aes_expandkey - Expands the AES key as described in FIPS-197
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* @ctx: The location where the computed key will be stored.
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* @in_key: The supplied key.
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* @key_len: The length of the supplied key.
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*
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* Returns 0 on success. The function fails only if an invalid key size (or
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* pointer) is supplied.
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* The expanded key size is 240 bytes (max of 14 rounds with a unique 16 bytes
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* key schedule plus a 16 bytes key which is used before the first round).
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* The decryption key is prepared for the "Equivalent Inverse Cipher" as
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* described in FIPS-197. The first slot (16 bytes) of each key (enc or dec) is
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* for the initial combination, the second slot for the first round and so on.
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*/
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int aes_expandkey(struct crypto_aes_ctx *ctx, const u8 *in_key,
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unsigned int key_len);
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/**
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* aes_encrypt - Encrypt a single AES block
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* @ctx: Context struct containing the key schedule
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* @out: Buffer to store the ciphertext
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* @in: Buffer containing the plaintext
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*/
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void aes_encrypt(const struct crypto_aes_ctx *ctx, u8 *out, const u8 *in);
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/**
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* aes_decrypt - Decrypt a single AES block
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* @ctx: Context struct containing the key schedule
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* @out: Buffer to store the plaintext
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* @in: Buffer containing the ciphertext
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*/
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void aes_decrypt(const struct crypto_aes_ctx *ctx, u8 *out, const u8 *in);
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extern const u8 crypto_aes_sbox[];
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extern const u8 crypto_aes_inv_sbox[];
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#endif
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