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crypto: ccp - Add XTS-AES-256 support for CCP version 5

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Signed-off-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Gary R Hook 2017-07-25 14:21:43 -05:00 committed by Herbert Xu
parent 7f7216cfaf
commit 5060ffc97b
3 changed files with 25 additions and 5 deletions
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26
drivers/crypto/ccp/ccp-crypto-aes-xts.c
View File

@ -80,19 +80,24 @@ static int ccp_aes_xts_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
{
struct crypto_tfm *xfm = crypto_ablkcipher_tfm(tfm);
struct ccp_ctx *ctx = crypto_tfm_ctx(xfm);
unsigned int ccpversion = ccp_version();
int ret;
ret = xts_check_key(xfm, key, key_len);
if (ret)
return ret;
/* Only support 128-bit AES key with a 128-bit Tweak key,
* otherwise use the fallback
/* Version 3 devices support 128-bit keys; version 5 devices can
* accommodate 128- and 256-bit keys.
*/
switch (key_len) {
case AES_KEYSIZE_128 * 2:
memcpy(ctx->u.aes.key, key, key_len);
break;
case AES_KEYSIZE_256 * 2:
if (ccpversion > CCP_VERSION(3, 0))
memcpy(ctx->u.aes.key, key, key_len);
break;
}
ctx->u.aes.key_len = key_len / 2;
sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);
@ -105,6 +110,8 @@ static int ccp_aes_xts_crypt(struct ablkcipher_request *req,
{
struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
unsigned int ccpversion = ccp_version();
unsigned int fallback = 0;
unsigned int unit;
u32 unit_size;
int ret;
@ -131,8 +138,19 @@ static int ccp_aes_xts_crypt(struct ablkcipher_request *req,
break;
}
}
if ((unit_size == CCP_XTS_AES_UNIT_SIZE__LAST) ||
(ctx->u.aes.key_len != AES_KEYSIZE_128)) {
/* The CCP has restrictions on block sizes. Also, a version 3 device
* only supports AES-128 operations; version 5 CCPs support both
* AES-128 and -256 operations.
*/
if (unit_size == CCP_XTS_AES_UNIT_SIZE__LAST)
fallback = 1;
if ((ccpversion < CCP_VERSION(5, 0)) &&
(ctx->u.aes.key_len != AES_KEYSIZE_128))
fallback = 1;
if ((ctx->u.aes.key_len != AES_KEYSIZE_128) &&
(ctx->u.aes.key_len != AES_KEYSIZE_256))
fallback = 1;
if (fallback) {
SKCIPHER_REQUEST_ON_STACK(subreq, ctx->u.aes.tfm_skcipher);
/* Use the fallback to process the request for any

2
drivers/crypto/ccp/ccp-crypto.h
View File

@ -99,7 +99,7 @@ struct ccp_aes_ctx {
struct scatterlist key_sg;
unsigned int key_len;
u8 key[AES_MAX_KEY_SIZE];
u8 key[AES_MAX_KEY_SIZE * 2];
u8 nonce[CTR_RFC3686_NONCE_SIZE];

2
drivers/crypto/ccp/ccp-ops.c
View File

@ -1065,6 +1065,8 @@ static int ccp_run_xts_aes_cmd(struct ccp_cmd_queue *cmd_q,
if (xts->key_len == AES_KEYSIZE_128)
aestype = CCP_AES_TYPE_128;
else if (xts->key_len == AES_KEYSIZE_256)
aestype = CCP_AES_TYPE_256;
else
return -EINVAL;