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authorDevulapally Shiva Krishna <shiva@chelsio.com>2020-05-05 06:12:56 +0300
committerDavid S. Miller <davem@davemloft.net>2020-05-07 03:44:11 +0300
commitee91ac1b11e44b38268a2f129c86a8a4ee4c218a (patch)
tree065b3e4b6231c2b56a56be2247a28efb5dc29ef6 /drivers/crypto
parent10b0c75d7bc19606fa9a62c8ab9180e95c0e0385 (diff)
downloadlinux-ee91ac1b11e44b38268a2f129c86a8a4ee4c218a.tar.xz
Crypto/chcr: support for 48 byte key_len in aes-xts
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>
Diffstat (limited to 'drivers/crypto')
-rw-r--r--drivers/crypto/chelsio/chcr_algo.c27
1 files changed, 25 insertions, 2 deletions
diff --git a/drivers/crypto/chelsio/chcr_algo.c b/drivers/crypto/chelsio/chcr_algo.c
index 6b1a656e0a89..0d25af42cadb 100644
--- a/drivers/crypto/chelsio/chcr_algo.c
+++ b/drivers/crypto/chelsio/chcr_algo.c
@@ -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: