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crypto: ccp - Fix XTS-AES-128 support on v5 CCPs 

Version 5 CCPs have some new requirements for XTS-AES: the type field
must be specified, and the key requires 512 bits, with each part
occupying 256 bits and padded with zeroes.

cc: <stable@vger.kernel.org> # 4.9.x+

Signed-off-by: Gary R Hook <ghook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Gary R Hook 2017-07-25 14:12:11 -05:00 committed by Herbert Xu
parent 7c83d689c7
commit e652399edb
5 changed files with 43 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/crypto/ccp/ccp-crypto-aes-xts.c
View File

@ -1,8 +1,9 @@
/*
* AMD Cryptographic Coprocessor (CCP) AES XTS crypto API support
*
* Copyright (C) 2013 Advanced Micro Devices, Inc.
* Copyright (C) 2013,2017 Advanced Micro Devices, Inc.
*
* Author: Gary R Hook <gary.hook@amd.com>
* Author: Tom Lendacky <thomas.lendacky@amd.com>
*
* This program is free software; you can redistribute it and/or modify
@ -164,6 +165,7 @@ static int ccp_aes_xts_crypt(struct ablkcipher_request *req,
memset(&rctx->cmd, 0, sizeof(rctx->cmd));
INIT_LIST_HEAD(&rctx->cmd.entry);
rctx->cmd.engine = CCP_ENGINE_XTS_AES_128;
rctx->cmd.u.xts.type = CCP_AES_TYPE_128;
rctx->cmd.u.xts.action = (encrypt) ? CCP_AES_ACTION_ENCRYPT
: CCP_AES_ACTION_DECRYPT;
rctx->cmd.u.xts.unit_size = unit_size;

2
drivers/crypto/ccp/ccp-dev-v5.c
View File

@ -145,6 +145,7 @@ union ccp_function {
#define CCP_AES_MODE(p) ((p)->aes.mode)
#define CCP_AES_TYPE(p) ((p)->aes.type)
#define CCP_XTS_SIZE(p) ((p)->aes_xts.size)
#define CCP_XTS_TYPE(p) ((p)->aes_xts.type)
#define CCP_XTS_ENCRYPT(p) ((p)->aes_xts.encrypt)
#define CCP_DES3_SIZE(p) ((p)->des3.size)
#define CCP_DES3_ENCRYPT(p) ((p)->des3.encrypt)
@ -344,6 +345,7 @@ static int ccp5_perform_xts_aes(struct ccp_op *op)
CCP5_CMD_PROT(&desc) = 0;
function.raw = 0;
CCP_XTS_TYPE(&function) = op->u.xts.type;
CCP_XTS_ENCRYPT(&function) = op->u.xts.action;
CCP_XTS_SIZE(&function) = op->u.xts.unit_size;
CCP5_CMD_FUNCTION(&desc) = function.raw;

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

@ -194,6 +194,7 @@
#define CCP_AES_CTX_SB_COUNT 1
#define CCP_XTS_AES_KEY_SB_COUNT 1
#define CCP5_XTS_AES_KEY_SB_COUNT 2
#define CCP_XTS_AES_CTX_SB_COUNT 1
#define CCP_DES3_KEY_SB_COUNT 1
@ -498,6 +499,7 @@ struct ccp_aes_op {
};
struct ccp_xts_aes_op {
enum ccp_aes_type type;
enum ccp_aes_action action;
enum ccp_xts_aes_unit_size unit_size;
};

43
drivers/crypto/ccp/ccp-ops.c
View File

@ -1038,6 +1038,8 @@ static int ccp_run_xts_aes_cmd(struct ccp_cmd_queue *cmd_q,
struct ccp_op op;
unsigned int unit_size, dm_offset;
bool in_place = false;
unsigned int sb_count;
enum ccp_aes_type aestype;
int ret;
switch (xts->unit_size) {
@ -1061,7 +1063,9 @@ static int ccp_run_xts_aes_cmd(struct ccp_cmd_queue *cmd_q,
return -EINVAL;
}
if (xts->key_len != AES_KEYSIZE_128)
if (xts->key_len == AES_KEYSIZE_128)
aestype = CCP_AES_TYPE_128;
else
return -EINVAL;
if (!xts->final && (xts->src_len & (AES_BLOCK_SIZE - 1)))
@ -1083,23 +1087,44 @@ static int ccp_run_xts_aes_cmd(struct ccp_cmd_queue *cmd_q,
op.sb_key = cmd_q->sb_key;
op.sb_ctx = cmd_q->sb_ctx;
op.init = 1;
op.u.xts.type = aestype;
op.u.xts.action = xts->action;
op.u.xts.unit_size = xts->unit_size;
/* All supported key sizes fit in a single (32-byte) SB entry
* and must be in little endian format. Use the 256-bit byte
* swap passthru option to convert from big endian to little
* endian.
/* A version 3 device only supports 128-bit keys, which fits into a
* single SB entry. A version 5 device uses a 512-bit vector, so two
* SB entries.
*/
if (cmd_q->ccp->vdata->version == CCP_VERSION(3, 0))
sb_count = CCP_XTS_AES_KEY_SB_COUNT;
else
sb_count = CCP5_XTS_AES_KEY_SB_COUNT;
ret = ccp_init_dm_workarea(&key, cmd_q,
CCP_XTS_AES_KEY_SB_COUNT * CCP_SB_BYTES,
sb_count * CCP_SB_BYTES,
DMA_TO_DEVICE);
if (ret)
return ret;
dm_offset = CCP_SB_BYTES - AES_KEYSIZE_128;
ccp_set_dm_area(&key, dm_offset, xts->key, 0, xts->key_len);
ccp_set_dm_area(&key, 0, xts->key, dm_offset, xts->key_len);
if (cmd_q->ccp->vdata->version == CCP_VERSION(3, 0)) {
/* All supported key sizes must be in little endian format.
* Use the 256-bit byte swap passthru option to convert from
* big endian to little endian.
*/
dm_offset = CCP_SB_BYTES - AES_KEYSIZE_128;
ccp_set_dm_area(&key, dm_offset, xts->key, 0, xts->key_len);
ccp_set_dm_area(&key, 0, xts->key, xts->key_len, xts->key_len);
} else {
/* Version 5 CCPs use a 512-bit space for the key: each portion
* occupies 256 bits, or one entire slot, and is zero-padded.
*/
unsigned int pad;
dm_offset = CCP_SB_BYTES;
pad = dm_offset - xts->key_len;
ccp_set_dm_area(&key, pad, xts->key, 0, xts->key_len);
ccp_set_dm_area(&key, dm_offset + pad, xts->key, xts->key_len,
xts->key_len);
}
ret = ccp_copy_to_sb(cmd_q, &key, op.jobid, op.sb_key,
CCP_PASSTHRU_BYTESWAP_256BIT);
if (ret) {

3
include/linux/ccp.h
View File

@ -1,7 +1,7 @@
/*
* AMD Cryptographic Coprocessor (CCP) driver
*
* Copyright (C) 2013,2016 Advanced Micro Devices, Inc.
* Copyright (C) 2013,2017 Advanced Micro Devices, Inc.
*
* Author: Tom Lendacky <thomas.lendacky@amd.com>
* Author: Gary R Hook <gary.hook@amd.com>
@ -229,6 +229,7 @@ enum ccp_xts_aes_unit_size {
* AES operation the new IV overwrites the old IV.
*/
struct ccp_xts_aes_engine {
enum ccp_aes_type type;
enum ccp_aes_action action;
enum ccp_xts_aes_unit_size unit_size;