diff options
Diffstat (limited to 'include/crypto/aes.h')
| -rw-r--r-- | include/crypto/aes.h | 58 |
1 files changed, 54 insertions, 4 deletions
diff --git a/include/crypto/aes.h b/include/crypto/aes.h index 0fdb542c70cd..2090729701ab 100644 --- a/include/crypto/aes.h +++ b/include/crypto/aes.h @@ -29,12 +29,62 @@ struct crypto_aes_ctx { }; 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; + +/* + * validate key length for AES algorithms + */ +static inline int aes_check_keylen(unsigned int keylen) +{ + switch (keylen) { + case AES_KEYSIZE_128: + case AES_KEYSIZE_192: + case AES_KEYSIZE_256: + break; + default: + return -EINVAL; + } + + return 0; +} 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); + +extern const u8 crypto_aes_sbox[]; +extern const u8 crypto_aes_inv_sbox[]; + #endif |