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Crypto/chcr: support for 48 byte key_len in aes-xts

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Added support for 48 byte key length for aes-xts.

Signed-off-by: Ayush Sawal <ayush.sawal@chelsio.com>
Signed-off-by: Devulapally Shiva Krishna <shiva@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Devulapally Shiva Krishna 2020-05-05 08:42:56 +05:30 committed by David S. Miller
parent 10b0c75d7b
commit ee91ac1b11
1 changed files with 25 additions and 2 deletions
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27
drivers/crypto/chelsio/chcr_algo.c
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@ -1077,7 +1077,14 @@ static int chcr_update_tweak(struct skcipher_request *req, u8 *iv,
keylen = ablkctx->enckey_len / 2;
key = ablkctx->key + keylen;
ret = aes_expandkey(&aes, key, keylen);
/* For a 192 bit key remove the padded zeroes which was
* added in chcr_xts_setkey
*/
if (KEY_CONTEXT_CK_SIZE_G(ntohl(ablkctx->key_ctx_hdr))
== CHCR_KEYCTX_CIPHER_KEY_SIZE_192)
ret = aes_expandkey(&aes, key, keylen - 8);
else
ret = aes_expandkey(&aes, key, keylen);
if (ret)
return ret;
aes_encrypt(&aes, iv, iv);
@ -2264,12 +2271,28 @@ static int chcr_aes_xts_setkey(struct crypto_skcipher *cipher, const u8 *key,
ablkctx->enckey_len = key_len;
get_aes_decrypt_key(ablkctx->rrkey, ablkctx->key, key_len << 2);
context_size = (KEY_CONTEXT_HDR_SALT_AND_PAD + key_len) >> 4;
ablkctx->key_ctx_hdr =
/* Both keys for xts must be aligned to 16 byte boundary
* by padding with zeros. So for 24 byte keys padding 8 zeroes.
*/
if (key_len == 48) {
context_size = (KEY_CONTEXT_HDR_SALT_AND_PAD + key_len
+ 16) >> 4;
memmove(ablkctx->key + 32, ablkctx->key + 24, 24);
memset(ablkctx->key + 24, 0, 8);
memset(ablkctx->key + 56, 0, 8);
ablkctx->enckey_len = 64;
ablkctx->key_ctx_hdr =
FILL_KEY_CTX_HDR(CHCR_KEYCTX_CIPHER_KEY_SIZE_192,
CHCR_KEYCTX_NO_KEY, 1,
0, context_size);
} else {
ablkctx->key_ctx_hdr =
FILL_KEY_CTX_HDR((key_len == AES_KEYSIZE_256) ?
CHCR_KEYCTX_CIPHER_KEY_SIZE_128 :
CHCR_KEYCTX_CIPHER_KEY_SIZE_256,
CHCR_KEYCTX_NO_KEY, 1,
0, context_size);
}
ablkctx->ciph_mode = CHCR_SCMD_CIPHER_MODE_AES_XTS;
return 0;
badkey_err: