[PATCH 4/4] crypto: ccree: re-introduce ccree eboiv support

Gilad Ben-Yossef
2020-10-26T13:05:32Z

BitLocker eboiv support, which was removed in
commit 1d8b41ff6991 ("crypto: ccree - remove bitlocker cipher")
is reintroduced based on the crypto API new support for
eboiv.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Fixes: 1d8b41ff6991 ("crypto: ccree - remove bitlocker cipher")
---
drivers/crypto/ccree/cc_cipher.c | 130 +++++++++++++++++++--------
drivers/crypto/ccree/cc_crypto_ctx.h | 1 +
2 files changed, 94 insertions(+), 37 deletions(-)

diff --git a/drivers/crypto/ccree/cc_cipher.c b/drivers/crypto/ccree/cc_cipher.c
index b5568de86ca4..23407063bd40 100644
--- a/drivers/crypto/ccree/cc_cipher.c
+++ b/drivers/crypto/ccree/cc_cipher.c
@@ -95,10 +95,14 @@ static int validate_keys_sizes(struct cc_cipher_ctx *ctx_p, u32 size)
case S_DIN_to_AES:
switch (size) {
case CC_AES_128_BIT_KEY_SIZE:
- case CC_AES_192_BIT_KEY_SIZE:
if (ctx_p->cipher_mode != DRV_CIPHER_XTS)
return 0;
break;
+ case CC_AES_192_BIT_KEY_SIZE:
+ if (ctx_p->cipher_mode != DRV_CIPHER_XTS &&
+ ctx_p->cipher_mode != DRV_CIPHER_BITLOCKER)
+ return 0;
+ break;
case CC_AES_256_BIT_KEY_SIZE:
return 0;
case (CC_AES_192_BIT_KEY_SIZE * 2):
@@ -141,6 +145,7 @@ static int validate_data_size(struct cc_cipher_ctx *ctx_p,
case DRV_CIPHER_ECB:
case DRV_CIPHER_CBC:
case DRV_CIPHER_ESSIV:
+ case DRV_CIPHER_BITLOCKER:
if (IS_ALIGNED(size, AES_BLOCK_SIZE))
return 0;
break;
@@ -366,7 +371,8 @@ static int cc_cipher_sethkey(struct crypto_skcipher *sktfm, const u8 *key,
}

if (ctx_p->cipher_mode == DRV_CIPHER_XTS ||
- ctx_p->cipher_mode == DRV_CIPHER_ESSIV) {
+ 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);
@@ -564,6 +570,7 @@ static void cc_setup_readiv_desc(struct crypto_tfm *tfm,
break;
case DRV_CIPHER_XTS:
case DRV_CIPHER_ESSIV:
+ case DRV_CIPHER_BITLOCKER:
/* IV */
hw_desc_init(&desc[*seq_size]);
set_setup_mode(&desc[*seq_size], SETUP_WRITE_STATE1);
@@ -618,6 +625,7 @@ static void cc_setup_state_desc(struct crypto_tfm *tfm,
break;
case DRV_CIPHER_XTS:
case DRV_CIPHER_ESSIV:
+ case DRV_CIPHER_BITLOCKER:
break;
default:
dev_err(dev, "Unsupported cipher mode (%d)\n", cipher_mode);
@@ -637,56 +645,68 @@ static void cc_setup_xex_state_desc(struct crypto_tfm *tfm,
int flow_mode = ctx_p->flow_mode;
int direction = req_ctx->gen_ctx.op_type;
dma_addr_t key_dma_addr = ctx_p->user.key_dma_addr;
- unsigned int key_len = (ctx_p->keylen / 2);
dma_addr_t iv_dma_addr = req_ctx->gen_ctx.iv_dma_addr;
- unsigned int key_offset = key_len;
+ unsigned int key_len;
+ unsigned int key_offset;

switch (cipher_mode) {
case DRV_CIPHER_ECB:
- break;
case DRV_CIPHER_CBC:
case DRV_CIPHER_CBC_CTS:
case DRV_CIPHER_CTR:
case DRV_CIPHER_OFB:
- break;
- case DRV_CIPHER_XTS:
- case DRV_CIPHER_ESSIV:
+ /* No secondary key for these ciphers, so just return */
+ return;

- if (cipher_mode == DRV_CIPHER_ESSIV)
- key_len = SHA256_DIGEST_SIZE;
+ case DRV_CIPHER_XTS:
+ /* Secondary key is same size as primary key and stored after primary key */
+ key_len = ctx_p->keylen / 2;
+ key_offset = key_len;
+ break;

- /* load XEX key */
- hw_desc_init(&desc[*seq_size]);
- set_cipher_mode(&desc[*seq_size], cipher_mode);
- set_cipher_config0(&desc[*seq_size], direction);
- if (cc_key_type(tfm) == CC_HW_PROTECTED_KEY) {
- set_hw_crypto_key(&desc[*seq_size],
- ctx_p->hw.key2_slot);
- } else {
- set_din_type(&desc[*seq_size], DMA_DLLI,
- (key_dma_addr + key_offset),
- key_len, NS_BIT);
- }
- set_xex_data_unit_size(&desc[*seq_size], nbytes);
- set_flow_mode(&desc[*seq_size], S_DIN_to_AES2);
- set_key_size_aes(&desc[*seq_size], key_len);
- set_setup_mode(&desc[*seq_size], SETUP_LOAD_XEX_KEY);
- (*seq_size)++;
+ case DRV_CIPHER_ESSIV:
+ /* Secondary key is a digest of primary key and stored after primary key */
+ key_len = SHA256_DIGEST_SIZE;
+ key_offset = ctx_p->keylen / 2;
+ break;

- /* Load IV */
- hw_desc_init(&desc[*seq_size]);
- set_setup_mode(&desc[*seq_size], SETUP_LOAD_STATE1);
- set_cipher_mode(&desc[*seq_size], cipher_mode);
- set_cipher_config0(&desc[*seq_size], direction);
- set_key_size_aes(&desc[*seq_size], key_len);
- set_flow_mode(&desc[*seq_size], flow_mode);
- set_din_type(&desc[*seq_size], DMA_DLLI, iv_dma_addr,
- CC_AES_BLOCK_SIZE, NS_BIT);
- (*seq_size)++;
+ case DRV_CIPHER_BITLOCKER:
+ /* Secondary key is same as primary key */
+ key_len = ctx_p->keylen;
+ key_offset = 0;
break;
+
default:
dev_err(dev, "Unsupported cipher mode (%d)\n", cipher_mode);
}
+
+ /* load XEX key */
+ hw_desc_init(&desc[*seq_size]);
+ set_cipher_mode(&desc[*seq_size], cipher_mode);
+ set_cipher_config0(&desc[*seq_size], direction);
+ if (cc_key_type(tfm) == CC_HW_PROTECTED_KEY) {
+ set_hw_crypto_key(&desc[*seq_size],
+ ctx_p->hw.key2_slot);
+ } else {
+ set_din_type(&desc[*seq_size], DMA_DLLI,
+ (key_dma_addr + key_offset),
+ key_len, NS_BIT);
+ }
+ set_xex_data_unit_size(&desc[*seq_size], nbytes);
+ set_flow_mode(&desc[*seq_size], S_DIN_to_AES2);
+ set_key_size_aes(&desc[*seq_size], key_len);
+ set_setup_mode(&desc[*seq_size], SETUP_LOAD_XEX_KEY);
+ (*seq_size)++;
+
+ /* Load IV */
+ hw_desc_init(&desc[*seq_size]);
+ set_setup_mode(&desc[*seq_size], SETUP_LOAD_STATE1);
+ set_cipher_mode(&desc[*seq_size], cipher_mode);
+ set_cipher_config0(&desc[*seq_size], direction);
+ set_key_size_aes(&desc[*seq_size], key_len);
+ set_flow_mode(&desc[*seq_size], flow_mode);
+ set_din_type(&desc[*seq_size], DMA_DLLI, iv_dma_addr, CC_AES_BLOCK_SIZE, NS_BIT);
+ (*seq_size)++;
}

static int cc_out_flow_mode(struct cc_cipher_ctx *ctx_p)
@@ -723,6 +743,7 @@ static void cc_setup_key_desc(struct crypto_tfm *tfm,
case DRV_CIPHER_CTR:
case DRV_CIPHER_OFB:
case DRV_CIPHER_ECB:
+ case DRV_CIPHER_BITLOCKER:
/* Load key */
hw_desc_init(&desc[*seq_size]);
set_cipher_mode(&desc[*seq_size], cipher_mode);
@@ -1061,6 +1082,24 @@ static const struct cc_alg_template skcipher_algs[] = {
.std_body = CC_STD_NIST,
.sec_func = true,
},
+ {
+ .name = "eboiv(cbc(paes))",
+ .driver_name = "eboiv-cbc-paes-ccree",
+ .blocksize = AES_BLOCK_SIZE,
+ .template_skcipher = {
+ .setkey = cc_cipher_sethkey,
+ .encrypt = cc_cipher_encrypt,
+ .decrypt = cc_cipher_decrypt,
+ .min_keysize = CC_HW_KEY_SIZE,
+ .max_keysize = CC_HW_KEY_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ },
+ .cipher_mode = DRV_CIPHER_BITLOCKER,
+ .flow_mode = S_DIN_to_AES,
+ .min_hw_rev = CC_HW_REV_712,
+ .std_body = CC_STD_NIST,
+ .sec_func = true,
+ },
{
.name = "ecb(paes)",
.driver_name = "ecb-paes-ccree",
@@ -1189,6 +1228,23 @@ static const struct cc_alg_template skcipher_algs[] = {
.min_hw_rev = CC_HW_REV_712,
.std_body = CC_STD_NIST,
},
+ {
+ .name = "eboiv(cbc(aes))",
+ .driver_name = "eboiv-cbc-aes-ccree",
+ .blocksize = AES_BLOCK_SIZE,
+ .template_skcipher = {
+ .setkey = cc_cipher_setkey,
+ .encrypt = cc_cipher_encrypt,
+ .decrypt = cc_cipher_decrypt,
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .ivsize = AES_BLOCK_SIZE,
+ },
+ .cipher_mode = DRV_CIPHER_BITLOCKER,
+ .flow_mode = S_DIN_to_AES,
+ .min_hw_rev = CC_HW_REV_712,
+ .std_body = CC_STD_NIST,
+ },
{
.name = "ecb(aes)",
.driver_name = "ecb-aes-ccree",
diff --git a/drivers/crypto/ccree/cc_crypto_ctx.h b/drivers/crypto/ccree/cc_crypto_ctx.h
index bd9a1c0896b3..ccf960a0d989 100644
--- a/drivers/crypto/ccree/cc_crypto_ctx.h
+++ b/drivers/crypto/ccree/cc_crypto_ctx.h
@@ -108,6 +108,7 @@ enum drv_cipher_mode {
DRV_CIPHER_CBC_CTS = 11,
DRV_CIPHER_GCTR = 12,
DRV_CIPHER_ESSIV = 13,
+ DRV_CIPHER_BITLOCKER = 14,
DRV_CIPHER_RESERVE32B = S32_MAX
};

--
2.28.0