diff options
Diffstat (limited to 'drivers/crypto/chelsio/chcr_algo.c')
| -rw-r--r-- | drivers/crypto/chelsio/chcr_algo.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/crypto/chelsio/chcr_algo.c b/drivers/crypto/chelsio/chcr_algo.c index e4ddb921d7b3..daad2bf2cb65 100644 --- a/drivers/crypto/chelsio/chcr_algo.c +++ b/drivers/crypto/chelsio/chcr_algo.c @@ -178,6 +178,58 @@ static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb) return flits + sgl_len(cnt); } +static inline void get_aes_decrypt_key(unsigned char *dec_key, + const unsigned char *key, + unsigned int keylength) +{ + u32 temp; + u32 w_ring[MAX_NK]; + int i, j, k; + u8 nr, nk; + + switch (keylength) { + case AES_KEYLENGTH_128BIT: + nk = KEYLENGTH_4BYTES; + nr = NUMBER_OF_ROUNDS_10; + break; + case AES_KEYLENGTH_192BIT: + nk = KEYLENGTH_6BYTES; + nr = NUMBER_OF_ROUNDS_12; + break; + case AES_KEYLENGTH_256BIT: + nk = KEYLENGTH_8BYTES; + nr = NUMBER_OF_ROUNDS_14; + break; + default: + return; + } + for (i = 0; i < nk; i++) + w_ring[i] = be32_to_cpu(*(u32 *)&key[4 * i]); + + i = 0; + temp = w_ring[nk - 1]; + while (i + nk < (nr + 1) * 4) { + if (!(i % nk)) { + /* RotWord(temp) */ + temp = (temp << 8) | (temp >> 24); + temp = aes_ks_subword(temp); + temp ^= round_constant[i / nk]; + } else if (nk == 8 && (i % 4 == 0)) { + temp = aes_ks_subword(temp); + } + w_ring[i % nk] ^= temp; + temp = w_ring[i % nk]; + i++; + } + i--; + for (k = 0, j = i % nk; k < nk; k++) { + *((u32 *)dec_key + k) = htonl(w_ring[j]); + j--; + if (j < 0) + j += nk; + } +} + static struct shash_desc *chcr_alloc_shash(unsigned int ds) { struct crypto_shash *base_hash = NULL; |