crypto: ccree - add remaining logic for CPP

Add the missing logic to set usage policy protections for keys.
This enables key policy protection for AES.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Gilad Ben-Yossef 2019-04-18 16:38:41 +03:00 committed by Herbert Xu
parent cadfd8987a
commit 52f42c650a
3 changed files with 184 additions and 57 deletions

View file

@ -34,6 +34,18 @@ struct cc_hw_key_info {
enum cc_hw_crypto_key key2_slot;
};
struct cc_cpp_key_info {
u8 slot;
enum cc_cpp_alg alg;
};
enum cc_key_type {
CC_UNPROTECTED_KEY, /* User key */
CC_HW_PROTECTED_KEY, /* HW (FDE) key */
CC_POLICY_PROTECTED_KEY, /* CPP key */
CC_INVALID_PROTECTED_KEY /* Invalid key */
};
struct cc_cipher_ctx {
struct cc_drvdata *drvdata;
int keylen;
@ -41,19 +53,22 @@ struct cc_cipher_ctx {
int cipher_mode;
int flow_mode;
unsigned int flags;
bool hw_key;
enum cc_key_type key_type;
struct cc_user_key_info user;
struct cc_hw_key_info hw;
union {
struct cc_hw_key_info hw;
struct cc_cpp_key_info cpp;
};
struct crypto_shash *shash_tfm;
};
static void cc_cipher_complete(struct device *dev, void *cc_req, int err);
static inline bool cc_is_hw_key(struct crypto_tfm *tfm)
static inline enum cc_key_type cc_key_type(struct crypto_tfm *tfm)
{
struct cc_cipher_ctx *ctx_p = crypto_tfm_ctx(tfm);
return ctx_p->hw_key;
return ctx_p->key_type;
}
static int validate_keys_sizes(struct cc_cipher_ctx *ctx_p, u32 size)
@ -232,7 +247,7 @@ struct tdes_keys {
u8 key3[DES_KEY_SIZE];
};
static enum cc_hw_crypto_key cc_slot_to_hw_key(int slot_num)
static enum cc_hw_crypto_key cc_slot_to_hw_key(u8 slot_num)
{
switch (slot_num) {
case 0:
@ -247,6 +262,22 @@ static enum cc_hw_crypto_key cc_slot_to_hw_key(int slot_num)
return END_OF_KEYS;
}
static u8 cc_slot_to_cpp_key(u8 slot_num)
{
return (slot_num - CC_FIRST_CPP_KEY_SLOT);
}
static inline enum cc_key_type cc_slot_to_key_type(u8 slot_num)
{
if (slot_num >= CC_FIRST_HW_KEY_SLOT && slot_num <= CC_LAST_HW_KEY_SLOT)
return CC_HW_PROTECTED_KEY;
else if (slot_num >= CC_FIRST_CPP_KEY_SLOT &&
slot_num <= CC_LAST_CPP_KEY_SLOT)
return CC_POLICY_PROTECTED_KEY;
else
return CC_INVALID_PROTECTED_KEY;
}
static int cc_cipher_sethkey(struct crypto_skcipher *sktfm, const u8 *key,
unsigned int keylen)
{
@ -261,18 +292,13 @@ static int cc_cipher_sethkey(struct crypto_skcipher *sktfm, const u8 *key,
/* STAT_PHASE_0: Init and sanity checks */
/* This check the size of the hardware key token */
/* This check the size of the protected key token */
if (keylen != sizeof(hki)) {
dev_err(dev, "Unsupported HW key size %d.\n", keylen);
dev_err(dev, "Unsupported protected key size %d.\n", keylen);
crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
if (ctx_p->flow_mode != S_DIN_to_AES) {
dev_err(dev, "HW key not supported for non-AES flows\n");
return -EINVAL;
}
memcpy(&hki, key, keylen);
/* The real key len for crypto op is the size of the HW key
@ -286,32 +312,71 @@ static int cc_cipher_sethkey(struct crypto_skcipher *sktfm, const u8 *key,
return -EINVAL;
}
ctx_p->hw.key1_slot = cc_slot_to_hw_key(hki.hw_key1);
if (ctx_p->hw.key1_slot == END_OF_KEYS) {
dev_err(dev, "Unsupported hw key1 number (%d)\n", hki.hw_key1);
ctx_p->keylen = keylen;
switch (cc_slot_to_key_type(hki.hw_key1)) {
case CC_HW_PROTECTED_KEY:
if (ctx_p->flow_mode == S_DIN_to_SM4) {
dev_err(dev, "Only AES HW protected keys are supported\n");
return -EINVAL;
}
ctx_p->hw.key1_slot = cc_slot_to_hw_key(hki.hw_key1);
if (ctx_p->hw.key1_slot == END_OF_KEYS) {
dev_err(dev, "Unsupported hw key1 number (%d)\n",
hki.hw_key1);
return -EINVAL;
}
if (ctx_p->cipher_mode == DRV_CIPHER_XTS ||
ctx_p->cipher_mode == DRV_CIPHER_ESSIV ||
ctx_p->cipher_mode == DRV_CIPHER_BITLOCKER) {
if (hki.hw_key1 == hki.hw_key2) {
dev_err(dev, "Illegal hw key numbers (%d,%d)\n",
hki.hw_key1, hki.hw_key2);
return -EINVAL;
}
ctx_p->hw.key2_slot = cc_slot_to_hw_key(hki.hw_key2);
if (ctx_p->hw.key2_slot == END_OF_KEYS) {
dev_err(dev, "Unsupported hw key2 number (%d)\n",
hki.hw_key2);
return -EINVAL;
}
}
ctx_p->key_type = CC_HW_PROTECTED_KEY;
dev_dbg(dev, "HW protected key %d/%d set\n.",
ctx_p->hw.key1_slot, ctx_p->hw.key2_slot);
break;
case CC_POLICY_PROTECTED_KEY:
if (ctx_p->drvdata->hw_rev < CC_HW_REV_713) {
dev_err(dev, "CPP keys not supported in this hardware revision.\n");
return -EINVAL;
}
if (ctx_p->cipher_mode != DRV_CIPHER_CBC &&
ctx_p->cipher_mode != DRV_CIPHER_CTR) {
dev_err(dev, "CPP keys only supported in CBC or CTR modes.\n");
return -EINVAL;
}
ctx_p->cpp.slot = cc_slot_to_cpp_key(hki.hw_key1);
if (ctx_p->flow_mode == S_DIN_to_AES)
ctx_p->cpp.alg = CC_CPP_AES;
else /* Must be SM4 since due to sethkey registration */
ctx_p->cpp.alg = CC_CPP_SM4;
ctx_p->key_type = CC_POLICY_PROTECTED_KEY;
dev_dbg(dev, "policy protedcted key alg: %d slot: %d.\n",
ctx_p->cpp.alg, ctx_p->cpp.slot);
break;
default:
dev_err(dev, "Unsupported protected key (%d)\n", hki.hw_key1);
return -EINVAL;
}
if (ctx_p->cipher_mode == DRV_CIPHER_XTS ||
ctx_p->cipher_mode == DRV_CIPHER_ESSIV ||
ctx_p->cipher_mode == DRV_CIPHER_BITLOCKER) {
if (hki.hw_key1 == hki.hw_key2) {
dev_err(dev, "Illegal hw key numbers (%d,%d)\n",
hki.hw_key1, hki.hw_key2);
return -EINVAL;
}
ctx_p->hw.key2_slot = cc_slot_to_hw_key(hki.hw_key2);
if (ctx_p->hw.key2_slot == END_OF_KEYS) {
dev_err(dev, "Unsupported hw key2 number (%d)\n",
hki.hw_key2);
return -EINVAL;
}
}
ctx_p->keylen = keylen;
ctx_p->hw_key = true;
dev_dbg(dev, "cc_is_hw_key ret 0");
return 0;
}
@ -338,7 +403,7 @@ static int cc_cipher_setkey(struct crypto_skcipher *sktfm, const u8 *key,
return -EINVAL;
}
ctx_p->hw_key = false;
ctx_p->key_type = CC_UNPROTECTED_KEY;
/*
* Verify DES weak keys
@ -451,7 +516,7 @@ static void cc_setup_state_desc(struct crypto_tfm *tfm,
hw_desc_init(&desc[*seq_size]);
set_cipher_mode(&desc[*seq_size], cipher_mode);
set_cipher_config0(&desc[*seq_size], direction);
if (cc_is_hw_key(tfm)) {
if (cc_key_type(tfm) == CC_HW_PROTECTED_KEY) {
set_hw_crypto_key(&desc[*seq_size],
ctx_p->hw.key2_slot);
} else {
@ -495,6 +560,7 @@ static void cc_setup_key_desc(struct crypto_tfm *tfm,
dma_addr_t key_dma_addr = ctx_p->user.key_dma_addr;
unsigned int key_len = ctx_p->keylen;
unsigned int du_size = nbytes;
unsigned int din_size;
struct cc_crypto_alg *cc_alg =
container_of(tfm->__crt_alg, struct cc_crypto_alg,
@ -511,27 +577,38 @@ static void cc_setup_key_desc(struct crypto_tfm *tfm,
case DRV_CIPHER_ECB:
/* Load key */
hw_desc_init(&desc[*seq_size]);
set_cipher_mode(&desc[*seq_size], cipher_mode);
set_cipher_config0(&desc[*seq_size], direction);
if (flow_mode == S_DIN_to_AES) {
if (cc_is_hw_key(tfm)) {
set_hw_crypto_key(&desc[*seq_size],
ctx_p->hw.key1_slot);
} else {
set_din_type(&desc[*seq_size], DMA_DLLI,
key_dma_addr, ((key_len == 24) ?
AES_MAX_KEY_SIZE :
key_len), NS_BIT);
}
set_key_size_aes(&desc[*seq_size], key_len);
if (cc_key_type(tfm) == CC_POLICY_PROTECTED_KEY) {
set_cpp_crypto_key(&desc[*seq_size], ctx_p->cpp.alg,
cipher_mode, ctx_p->cpp.slot);
} else {
/*des*/
set_din_type(&desc[*seq_size], DMA_DLLI, key_dma_addr,
key_len, NS_BIT);
set_key_size_des(&desc[*seq_size], key_len);
set_cipher_mode(&desc[*seq_size], cipher_mode);
set_cipher_config0(&desc[*seq_size], direction);
if (flow_mode == S_DIN_to_AES) {
if (cc_key_type(tfm) == CC_HW_PROTECTED_KEY) {
set_hw_crypto_key(&desc[*seq_size],
ctx_p->hw.key1_slot);
} else {
/* CC_POLICY_UNPROTECTED_KEY
* Invalid keys are filtered out in
* sethkey()
*/
din_size = (key_len == 24) ?
AES_MAX_KEY_SIZE : key_len;
set_din_type(&desc[*seq_size], DMA_DLLI,
key_dma_addr, din_size,
NS_BIT);
}
set_key_size_aes(&desc[*seq_size], key_len);
} else {
/*des*/
set_din_type(&desc[*seq_size], DMA_DLLI,
key_dma_addr, key_len, NS_BIT);
set_key_size_des(&desc[*seq_size], key_len);
}
set_flow_mode(&desc[*seq_size], flow_mode);
set_setup_mode(&desc[*seq_size], SETUP_LOAD_KEY0);
}
set_flow_mode(&desc[*seq_size], flow_mode);
set_setup_mode(&desc[*seq_size], SETUP_LOAD_KEY0);
(*seq_size)++;
break;
case DRV_CIPHER_XTS:
@ -541,7 +618,7 @@ static void cc_setup_key_desc(struct crypto_tfm *tfm,
hw_desc_init(&desc[*seq_size]);
set_cipher_mode(&desc[*seq_size], cipher_mode);
set_cipher_config0(&desc[*seq_size], direction);
if (cc_is_hw_key(tfm)) {
if (cc_key_type(tfm) == CC_HW_PROTECTED_KEY) {
set_hw_crypto_key(&desc[*seq_size],
ctx_p->hw.key1_slot);
} else {
@ -789,6 +866,13 @@ static int cc_cipher_process(struct skcipher_request *req,
cc_req.user_cb = (void *)cc_cipher_complete;
cc_req.user_arg = (void *)req;
/* Setup CPP operation details */
if (ctx_p->key_type == CC_POLICY_PROTECTED_KEY) {
cc_req.cpp.is_cpp = true;
cc_req.cpp.alg = ctx_p->cpp.alg;
cc_req.cpp.slot = ctx_p->cpp.slot;
}
/* Setup request context */
req_ctx->gen_ctx.op_type = direction;

View file

@ -28,11 +28,13 @@
GENMASK(CC_REG_HIGH(word, name), CC_REG_LOW(word, name))
#define WORD0_VALUE CC_GENMASK(0, VALUE)
#define WORD0_CPP_CIPHER_MODE CC_GENMASK(0, CPP_CIPHER_MODE)
#define WORD1_DIN_CONST_VALUE CC_GENMASK(1, DIN_CONST_VALUE)
#define WORD1_DIN_DMA_MODE CC_GENMASK(1, DIN_DMA_MODE)
#define WORD1_DIN_SIZE CC_GENMASK(1, DIN_SIZE)
#define WORD1_NOT_LAST CC_GENMASK(1, NOT_LAST)
#define WORD1_NS_BIT CC_GENMASK(1, NS_BIT)
#define WORD1_LOCK_QUEUE CC_GENMASK(1, LOCK_QUEUE)
#define WORD2_VALUE CC_GENMASK(2, VALUE)
#define WORD3_DOUT_DMA_MODE CC_GENMASK(3, DOUT_DMA_MODE)
#define WORD3_DOUT_LAST_IND CC_GENMASK(3, DOUT_LAST_IND)
@ -53,6 +55,8 @@
#define WORD4_DATA_FLOW_MODE CC_GENMASK(4, DATA_FLOW_MODE)
#define WORD4_KEY_SIZE CC_GENMASK(4, KEY_SIZE)
#define WORD4_SETUP_OPERATION CC_GENMASK(4, SETUP_OPERATION)
#define WORD4_CPP_ALG CC_GENMASK(4, CPP_ALG)
#define WORD4_CPP_SLOT CC_GENMASK(4, CPP_SLOT)
#define WORD5_DIN_ADDR_HIGH CC_GENMASK(5, DIN_ADDR_HIGH)
#define WORD5_DOUT_ADDR_HIGH CC_GENMASK(5, DOUT_ADDR_HIGH)
@ -176,6 +180,15 @@ enum cc_hw_crypto_key {
END_OF_KEYS = S32_MAX,
};
#define CC_NUM_HW_KEY_SLOTS 4
#define CC_FIRST_HW_KEY_SLOT 0
#define CC_LAST_HW_KEY_SLOT (CC_FIRST_HW_KEY_SLOT + CC_NUM_HW_KEY_SLOTS - 1)
#define CC_NUM_CPP_KEY_SLOTS 8
#define CC_FIRST_CPP_KEY_SLOT 16
#define CC_LAST_CPP_KEY_SLOT (CC_FIRST_CPP_KEY_SLOT + \
CC_NUM_CPP_KEY_SLOTS - 1)
enum cc_hw_aes_key_size {
AES_128_KEY = 0,
AES_192_KEY = 1,
@ -189,6 +202,8 @@ enum cc_hash_cipher_pad {
HASH_CIPHER_DO_PADDING_RESERVE32 = S32_MAX,
};
#define CC_CPP_DESC_INDICATOR 0xFF0000UL
/*****************************/
/* Descriptor packing macros */
/*****************************/
@ -248,6 +263,28 @@ static inline void set_din_no_dma(struct cc_hw_desc *pdesc, u32 addr, u32 size)
pdesc->word[1] |= FIELD_PREP(WORD1_DIN_SIZE, size);
}
/*
* Setup the special CPP descriptor
*
* @pdesc: pointer HW descriptor struct
* @alg: cipher used (AES / SM4)
* @mode: mode used (CTR or CBC)
* @slot: slot number
* @ksize: key size
*/
static inline void set_cpp_crypto_key(struct cc_hw_desc *pdesc,
enum cc_cpp_alg alg,
enum drv_cipher_mode mode, u8 slot)
{
u8 mode_val = (mode == DRV_CIPHER_CBC ? 0 : 1);
pdesc->word[1] |= FIELD_PREP(WORD1_DIN_SIZE, CC_CPP_DESC_INDICATOR);
pdesc->word[1] |= FIELD_PREP(WORD1_LOCK_QUEUE, 1);
pdesc->word[0] |= FIELD_PREP(WORD0_CPP_CIPHER_MODE, mode_val);
pdesc->word[4] |= FIELD_PREP(WORD4_CPP_ALG, alg);
pdesc->word[4] |= FIELD_PREP(WORD4_CPP_SLOT, slot);
}
/*
* Set the DIN field of a HW descriptors to SRAM mode.
* Note: No need to check SRAM alignment since host requests do not use SRAM and

View file

@ -31,6 +31,8 @@
#define CC_DSCRPTR_QUEUE_WORD0_REG_OFFSET 0xE80UL
#define CC_DSCRPTR_QUEUE_WORD0_VALUE_BIT_SHIFT 0x0UL
#define CC_DSCRPTR_QUEUE_WORD0_VALUE_BIT_SIZE 0x20UL
#define CC_DSCRPTR_QUEUE_WORD0_CPP_CIPHER_MODE_BIT_SHIFT 0x5UL
#define CC_DSCRPTR_QUEUE_WORD0_CPP_CIPHER_MODE_BIT_SIZE 0x3UL
#define CC_DSCRPTR_QUEUE_WORD1_REG_OFFSET 0xE84UL
#define CC_DSCRPTR_QUEUE_WORD1_DIN_DMA_MODE_BIT_SHIFT 0x0UL
#define CC_DSCRPTR_QUEUE_WORD1_DIN_DMA_MODE_BIT_SIZE 0x2UL
@ -97,6 +99,10 @@
#define CC_DSCRPTR_QUEUE_WORD4_WORD_SWAP_BIT_SIZE 0x1UL
#define CC_DSCRPTR_QUEUE_WORD4_BYTES_SWAP_BIT_SHIFT 0x1FUL
#define CC_DSCRPTR_QUEUE_WORD4_BYTES_SWAP_BIT_SIZE 0x1UL
#define CC_DSCRPTR_QUEUE_WORD4_CPP_SLOT_BIT_SHIFT 0xAUL
#define CC_DSCRPTR_QUEUE_WORD4_CPP_SLOT_BIT_SIZE 0x3UL
#define CC_DSCRPTR_QUEUE_WORD4_CPP_ALG_BIT_SHIFT 0xDUL
#define CC_DSCRPTR_QUEUE_WORD4_CPP_ALG_BIT_SIZE 0x1UL
#define CC_DSCRPTR_QUEUE_WORD5_REG_OFFSET 0xE94UL
#define CC_DSCRPTR_QUEUE_WORD5_DIN_ADDR_HIGH_BIT_SHIFT 0x0UL
#define CC_DSCRPTR_QUEUE_WORD5_DIN_ADDR_HIGH_BIT_SIZE 0x10UL