diff options
| author | Devulapally Shiva Krishna <shiva@chelsio.com> | 2020-05-05 08:42:56 +0530 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-05-06 17:44:11 -0700 |
| commit | ee91ac1b11e44b38268a2f129c86a8a4ee4c218a (patch) | |
| tree | 065b3e4b6231c2b56a56be2247a28efb5dc29ef6 /drivers/crypto/chelsio | |
| parent | 10b0c75d7bc19606fa9a62c8ab9180e95c0e0385 (diff) | |
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/chelsio')
| -rw-r--r-- | drivers/crypto/chelsio/chcr_algo.c | 27 |
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: |