diff options
| author | Gary R Hook <gary.hook@amd.com> | 2017-07-25 21:21:43 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2017-08-04 03:27:44 +0200 |
| commit | 5060ffc97bc6fdd31595b3ecbc027b0a8df94b5c (patch) | |
| tree | 229f3e3163e3e29157551cbe9b04aaf56343d953 /drivers | |
| parent | crypto: ccp - Rework the unit-size check for XTS-AES (diff) | |
| download | linux-5060ffc97bc6fdd31595b3ecbc027b0a8df94b5c.tar.xz linux-5060ffc97bc6fdd31595b3ecbc027b0a8df94b5c.zip | |
crypto: ccp - Add XTS-AES-256 support for CCP version 5
Signed-off-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/crypto/ccp/ccp-crypto-aes-xts.c | 26 | ||||
| -rw-r--r-- | drivers/crypto/ccp/ccp-crypto.h | 2 | ||||
| -rw-r--r-- | drivers/crypto/ccp/ccp-ops.c | 2 |
3 files changed, 25 insertions, 5 deletions
diff --git a/drivers/crypto/ccp/ccp-crypto-aes-xts.c b/drivers/crypto/ccp/ccp-crypto-aes-xts.c index 5c2df880ab48..94b5bcf5b628 100644 --- a/drivers/crypto/ccp/ccp-crypto-aes-xts.c +++ b/drivers/crypto/ccp/ccp-crypto-aes-xts.c @@ -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 diff --git a/drivers/crypto/ccp/ccp-crypto.h b/drivers/crypto/ccp/ccp-crypto.h index 67c7620029e3..b9fd090c46c2 100644 --- a/drivers/crypto/ccp/ccp-crypto.h +++ b/drivers/crypto/ccp/ccp-crypto.h @@ -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]; diff --git a/drivers/crypto/ccp/ccp-ops.c b/drivers/crypto/ccp/ccp-ops.c index 10e3be8d93ce..cc16cb0fc3af 100644 --- a/drivers/crypto/ccp/ccp-ops.c +++ b/drivers/crypto/ccp/ccp-ops.c @@ -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; |