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authorpuneet saxena <puneets@nvidia.com>2011-04-19 15:31:40 +0530
committerVarun Colbert <vcolbert@nvidia.com>2011-04-20 22:24:29 -0700
commit75d25d6e65d7ffb5c238c69d5c81ea6a8f8e61b2 (patch)
treef58323e0915e33cbf73b9f43d084f94a537e3774 /drivers
parent7658942c9866ae6299a7b50735007ae763b303e6 (diff)
crypto: tegra-aes: add support for aes-ofb mode
Bug 787628 Change-Id: I73c3b8f0b3e69f1c4bc13bdaea84b19b14eb73d1 Signed-off-by: Puneet Saxena <puneets@nvidia.com> Reviewed-on: http://git-master/r/28003 Reviewed-by: Varun Colbert <vcolbert@nvidia.com> Tested-by: Varun Colbert <vcolbert@nvidia.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/crypto/tegra-aes.c66
-rw-r--r--drivers/crypto/tegra-aes.h4
2 files changed, 57 insertions, 13 deletions
diff --git a/drivers/crypto/tegra-aes.c b/drivers/crypto/tegra-aes.c
index c56d87c18118..586366f7eea6 100644
--- a/drivers/crypto/tegra-aes.c
+++ b/drivers/crypto/tegra-aes.c
@@ -43,16 +43,17 @@
#include "tegra-aes.h"
-#define FLAGS_MODE_MASK 0x000f
+#define FLAGS_MODE_MASK 0x00ff
#define FLAGS_ENCRYPT BIT(0)
-#define FLAGS_CBC BIT(1)
-#define FLAGS_GIV BIT(2)
-#define FLAGS_RNG BIT(3)
-#define FLAGS_NEW_KEY BIT(4)
-#define FLAGS_NEW_IV BIT(5)
-#define FLAGS_INIT BIT(6)
-#define FLAGS_FAST BIT(7)
-#define FLAGS_BUSY 8
+#define FLAGS_CBC BIT(1)
+#define FLAGS_GIV BIT(2)
+#define FLAGS_RNG BIT(3)
+#define FLAGS_OFB BIT(4)
+#define FLAGS_NEW_KEY BIT(5)
+#define FLAGS_NEW_IV BIT(6)
+#define FLAGS_INIT BIT(7)
+#define FLAGS_FAST BIT(8)
+#define FLAGS_BUSY 9
/*
* Defines AES engine Max process bytes size in one go, which takes 1 msec.
@@ -265,6 +266,7 @@ static int aes_start_crypt(struct tegra_aes_dev *dd, u32 in_addr, u32 out_addr,
aes_writel(dd, value, CMDQUE_CONTROL);
dev_dbg(dd->dev, "cmd_q_ctrl=0x%x", value);
+ value = 0;
if (mode & FLAGS_CBC) {
value = ((0x1 << SECURE_INPUT_ALG_SEL_SHIFT) |
((dd->ctx->keylen * 8) << SECURE_INPUT_KEY_LEN_SHIFT) |
@@ -278,6 +280,17 @@ static int aes_start_crypt(struct tegra_aes_dev *dd, u32 in_addr, u32 out_addr,
<< SECURE_CORE_SEL_SHIFT |
(0 << SECURE_RNG_ENB_SHIFT) |
(0 << SECURE_HASH_ENB_SHIFT));
+ } else if (mode & FLAGS_OFB) {
+ value = ((0x1 << SECURE_INPUT_ALG_SEL_SHIFT) |
+ ((dd->ctx->keylen * 8) << SECURE_INPUT_KEY_LEN_SHIFT) |
+ ((u32)upd_iv << SECURE_IV_SELECT_SHIFT) |
+ ((u32)0 << SECURE_IV_SELECT_SHIFT) |
+ (SECURE_XOR_POS_FIELD) |
+ (2 << SECURE_INPUT_SEL_SHIFT) |
+ (0 << SECURE_VCTRAM_SEL_SHIFT) |
+ (SECURE_CORE_SEL_FIELD) |
+ (0 << SECURE_RNG_ENB_SHIFT) |
+ (0 << SECURE_HASH_ENB_SHIFT));
} else if (mode & FLAGS_RNG){
value = ((0x1 << SECURE_INPUT_ALG_SEL_SHIFT) |
((dd->ctx->keylen * 8) << SECURE_INPUT_KEY_LEN_SHIFT) |
@@ -497,8 +510,11 @@ static int tegra_aes_handle_req(struct tegra_aes_dev *dd)
ctx->flags &= ~FLAGS_NEW_KEY;
}
- if ((dd->flags & FLAGS_CBC) && dd->iv) {
- /* set iv to the aes hw slot */
+ if (((dd->flags & FLAGS_CBC) || (dd->flags & FLAGS_OFB)) && dd->iv) {
+ /* set iv to the aes hw slot
+ * Hw generates updated iv only after iv is set in slot.
+ * So key and iv is passed asynchronously.
+ */
memcpy(dd->buf_in, dd->iv, dd->ivlen);
ret = aes_start_crypt(dd, (u32)dd->dma_buf_in,
@@ -678,7 +694,15 @@ static int tegra_aes_cbc_decrypt(struct ablkcipher_request *req)
{
return tegra_aes_crypt(req, FLAGS_CBC);
}
+static int tegra_aes_ofb_encrypt(struct ablkcipher_request *req)
+{
+ return tegra_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_OFB);
+}
+static int tegra_aes_ofb_decrypt(struct ablkcipher_request *req)
+{
+ return tegra_aes_crypt(req, FLAGS_OFB);
+}
static int tegra_aes_get_random(struct crypto_rng *tfm, u8 *rdata,
unsigned int dlen)
{
@@ -896,6 +920,26 @@ static struct crypto_alg algs[] = {
.decrypt = tegra_aes_cbc_decrypt,
}
}, {
+ .cra_name = "disabled_ofb(aes)",
+ .cra_driver_name = "ofb-aes-tegra",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct tegra_aes_ctx),
+ .cra_alignmask = 3,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = tegra_aes_cra_init,
+ .cra_exit = tegra_aes_cra_exit,
+ .cra_u.ablkcipher = {
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .ivsize = AES_MIN_KEY_SIZE,
+ .setkey = tegra_aes_setkey,
+ .encrypt = tegra_aes_ofb_encrypt,
+ .decrypt = tegra_aes_ofb_decrypt,
+ }
+ }, {
.cra_name = "disabled_ansi_cprng",
.cra_driver_name = "rng-aes-tegra",
.cra_priority = 100,
diff --git a/drivers/crypto/tegra-aes.h b/drivers/crypto/tegra-aes.h
index 83dd6bbc90e0..bb311bb58c48 100644
--- a/drivers/crypto/tegra-aes.h
+++ b/drivers/crypto/tegra-aes.h
@@ -71,9 +71,9 @@
#define CMDQ_CTRL_DST_STM_SEL_SHIFT 5
#define CMDQ_CTRL_DST_STM_SEL_FIELD (1 << CMDQ_CTRL_DST_STM_SEL_SHIFT)
#define CMDQ_CTRL_ICMDQEN_SHIFT 1
-#define CMDQ_CTRL_ICMDQEN_FIELD (1 << CMDQ_CTRL_SRC_STM_SEL_SHIFT)
+#define CMDQ_CTRL_ICMDQEN_FIELD (1 << CMDQ_CTRL_ICMDQEN_SHIFT)
#define CMDQ_CTRL_UCMDQEN_SHIFT 0
-#define CMDQ_CTRL_UCMDQEN_FIELD (1 << CMDQ_CTRL_DST_STM_SEL_SHIFT)
+#define CMDQ_CTRL_UCMDQEN_FIELD (1 << CMDQ_CTRL_UCMDQEN_SHIFT)
/* config regsiter masks and shifts */
#define CONFIG_ENDIAN_ENB_SHIFT 10