[PATCH v2 10/10] crypto: omap-aes - Add CTR algorithm Support
Mark A. Greer
mgreer at animalcreek.com
Tue Jan 8 13:57:47 EST 2013
From: "Mark A. Greer" <mgreer at animalcreek.com>
The OMAP3 and OMAP4/AM33xx versions of the AES crypto
module support the CTR algorithm in addition to ECB
and CBC that the OMAP2 version of the module supports.
So, OMAP2 and OMAP3 share a common register set but
OMAP3 supports CTR while OMAP2 doesn't. OMAP4/AM33XX
uses a different register set from OMAP2/OMAP3 and
also supports CTR.
To add this support, use the platform_data introduced
in an ealier commit to hold the list of algorithms
supported by the current module. The probe routine
will use that list to register the correct algorithms.
Note: The code being integrated is from the TI AM33xx SDK
and was written by Greg Turner <gkmturner at gmail.com> and
Herman Schuurman (current email unknown) while at TI.
CC: Greg Turner <gkmturner at gmail.com>
CC: Dmitry Kasatkin <dmitry.kasatkin at intel.com>
Signed-off-by: Mark A. Greer <mgreer at animalcreek.com>
---
drivers/crypto/omap-aes.c | 143 +++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 128 insertions(+), 15 deletions(-)
diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
index bd1ad97..6aa425f 100644
--- a/drivers/crypto/omap-aes.c
+++ b/drivers/crypto/omap-aes.c
@@ -48,7 +48,11 @@
#define AES_REG_IV(dd, x) ((dd)->pdata->iv_ofs + ((x) * 0x04))
#define AES_REG_CTRL(dd) ((dd)->pdata->ctrl_ofs)
-#define AES_REG_CTRL_CTR_WIDTH (1 << 7)
+#define AES_REG_CTRL_CTR_WIDTH_MASK (3 << 7)
+#define AES_REG_CTRL_CTR_WIDTH_32 (0 << 7)
+#define AES_REG_CTRL_CTR_WIDTH_64 (1 << 7)
+#define AES_REG_CTRL_CTR_WIDTH_96 (2 << 7)
+#define AES_REG_CTRL_CTR_WIDTH_128 (3 << 7)
#define AES_REG_CTRL_CTR (1 << 6)
#define AES_REG_CTRL_CBC (1 << 5)
#define AES_REG_CTRL_KEY_SIZE (3 << 3)
@@ -76,6 +80,7 @@
#define FLAGS_ENCRYPT BIT(0)
#define FLAGS_CBC BIT(1)
#define FLAGS_GIV BIT(2)
+#define FLAGS_CTR BIT(3)
#define FLAGS_INIT BIT(4)
#define FLAGS_FAST BIT(5)
@@ -96,7 +101,16 @@ struct omap_aes_reqctx {
#define OMAP_AES_QUEUE_LENGTH 1
#define OMAP_AES_CACHE_SIZE 0
+struct omap_aes_algs_info {
+ struct crypto_alg *algs_list;
+ unsigned int size;
+ unsigned int registered;
+};
+
struct omap_aes_pdata {
+ struct omap_aes_algs_info *algs_info;
+ unsigned int algs_info_size;
+
void (*trigger)(struct omap_aes_dev *dd, int length);
u32 key_ofs;
@@ -208,7 +222,7 @@ static int omap_aes_write_ctrl(struct omap_aes_dev *dd)
{
unsigned int key32;
int i, err;
- u32 val, mask;
+ u32 val, mask = 0;
err = omap_aes_hw_init(dd);
if (err)
@@ -222,16 +236,20 @@ static int omap_aes_write_ctrl(struct omap_aes_dev *dd)
__le32_to_cpu(dd->ctx->key[i]));
}
- if ((dd->flags & FLAGS_CBC) && dd->req->info)
+ if ((dd->flags & (FLAGS_CBC | FLAGS_CTR)) && dd->req->info)
omap_aes_write_n(dd, AES_REG_IV(dd, 0), dd->req->info, 4);
val = FLD_VAL(((dd->ctx->keylen >> 3) - 1), 4, 3);
if (dd->flags & FLAGS_CBC)
val |= AES_REG_CTRL_CBC;
+ if (dd->flags & FLAGS_CTR) {
+ val |= AES_REG_CTRL_CTR | AES_REG_CTRL_CTR_WIDTH_32;
+ mask = AES_REG_CTRL_CTR | AES_REG_CTRL_CTR_WIDTH_MASK;
+ }
if (dd->flags & FLAGS_ENCRYPT)
val |= AES_REG_CTRL_DIRECTION;
- mask = AES_REG_CTRL_CBC | AES_REG_CTRL_DIRECTION |
+ mask |= AES_REG_CTRL_CBC | AES_REG_CTRL_DIRECTION |
AES_REG_CTRL_KEY_SIZE;
omap_aes_write_mask(dd, AES_REG_CTRL(dd), val, mask);
@@ -807,6 +825,16 @@ static int omap_aes_cbc_decrypt(struct ablkcipher_request *req)
return omap_aes_crypt(req, FLAGS_CBC);
}
+static int omap_aes_ctr_encrypt(struct ablkcipher_request *req)
+{
+ return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CTR);
+}
+
+static int omap_aes_ctr_decrypt(struct ablkcipher_request *req)
+{
+ return omap_aes_crypt(req, FLAGS_CTR);
+}
+
static int omap_aes_cra_init(struct crypto_tfm *tfm)
{
pr_debug("enter\n");
@@ -823,7 +851,7 @@ static void omap_aes_cra_exit(struct crypto_tfm *tfm)
/* ********************** ALGS ************************************ */
-static struct crypto_alg algs[] = {
+static struct crypto_alg algs_ecb_cbc[] = {
{
.cra_name = "ecb(aes)",
.cra_driver_name = "ecb-aes-omap",
@@ -871,7 +899,43 @@ static struct crypto_alg algs[] = {
}
};
+static struct crypto_alg algs_ctr[] = {
+{
+ .cra_name = "ctr(aes)",
+ .cra_driver_name = "ctr-aes-omap",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
+ CRYPTO_ALG_KERN_DRIVER_ONLY |
+ CRYPTO_ALG_ASYNC,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct omap_aes_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = omap_aes_cra_init,
+ .cra_exit = omap_aes_cra_exit,
+ .cra_u.ablkcipher = {
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .geniv = "eseqiv",
+ .ivsize = AES_BLOCK_SIZE,
+ .setkey = omap_aes_setkey,
+ .encrypt = omap_aes_ctr_encrypt,
+ .decrypt = omap_aes_ctr_decrypt,
+ }
+} ,
+};
+
+static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc[] = {
+ {
+ .algs_list = algs_ecb_cbc,
+ .size = ARRAY_SIZE(algs_ecb_cbc),
+ },
+};
+
static const struct omap_aes_pdata omap_aes_pdata_omap2 = {
+ .algs_info = omap_aes_algs_info_ecb_cbc,
+ .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc),
.trigger = omap_aes_dma_trigger_omap2,
.key_ofs = 0x1c,
.iv_ofs = 0x20,
@@ -889,7 +953,39 @@ static const struct omap_aes_pdata omap_aes_pdata_omap2 = {
};
#ifdef CONFIG_OF
+static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc_ctr[] = {
+ {
+ .algs_list = algs_ecb_cbc,
+ .size = ARRAY_SIZE(algs_ecb_cbc),
+ },
+ {
+ .algs_list = algs_ctr,
+ .size = ARRAY_SIZE(algs_ctr),
+ },
+};
+
+static const struct omap_aes_pdata omap_aes_pdata_omap3 = {
+ .algs_info = omap_aes_algs_info_ecb_cbc_ctr,
+ .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
+ .trigger = omap_aes_dma_trigger_omap2,
+ .key_ofs = 0x1c,
+ .iv_ofs = 0x20,
+ .ctrl_ofs = 0x30,
+ .data_ofs = 0x34,
+ .rev_ofs = 0x44,
+ .mask_ofs = 0x48,
+ .dma_enable_in = BIT(2),
+ .dma_enable_out = BIT(3),
+ .dma_start = BIT(5),
+ .major_mask = 0xf0,
+ .major_shift = 4,
+ .minor_mask = 0x0f,
+ .minor_shift = 0,
+};
+
static const struct omap_aes_pdata omap_aes_pdata_omap4 = {
+ .algs_info = omap_aes_algs_info_ecb_cbc_ctr,
+ .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
.trigger = omap_aes_dma_trigger_omap4,
.key_ofs = 0x3c,
.iv_ofs = 0x40,
@@ -911,6 +1007,10 @@ static const struct of_device_id omap_aes_of_match[] = {
.data = &omap_aes_pdata_omap2,
},
{
+ .compatible = "ti,omap3-aes",
+ .data = &omap_aes_pdata_omap3,
+ },
+ {
.compatible = "ti,omap4-aes",
.data = &omap_aes_pdata_omap4,
},
@@ -1004,6 +1104,7 @@ static int omap_aes_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct omap_aes_dev *dd;
+ struct crypto_alg *algp;
struct resource res;
int err = -ENOMEM, i, j;
u32 reg;
@@ -1057,17 +1158,27 @@ static int omap_aes_probe(struct platform_device *pdev)
list_add_tail(&dd->list, &dev_list);
spin_unlock(&list_lock);
- for (i = 0; i < ARRAY_SIZE(algs); i++) {
- pr_debug("i: %d\n", i);
- err = crypto_register_alg(&algs[i]);
- if (err)
- goto err_algs;
+ for (i = 0; i < dd->pdata->algs_info_size; i++) {
+ for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
+ algp = &dd->pdata->algs_info[i].algs_list[j];
+
+ pr_debug("reg alg: %s\n", algp->cra_name);
+ INIT_LIST_HEAD(&algp->cra_list);
+
+ err = crypto_register_alg(algp);
+ if (err)
+ goto err_algs;
+
+ dd->pdata->algs_info[i].registered++;
+ }
}
return 0;
err_algs:
- for (j = 0; j < i; j++)
- crypto_unregister_alg(&algs[j]);
+ for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
+ for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
+ crypto_unregister_alg(
+ &dd->pdata->algs_info[i].algs_list[j]);
omap_aes_dma_cleanup(dd);
err_dma:
tasklet_kill(&dd->done_task);
@@ -1084,7 +1195,7 @@ err_data:
static int omap_aes_remove(struct platform_device *pdev)
{
struct omap_aes_dev *dd = platform_get_drvdata(pdev);
- int i;
+ int i, j;
if (!dd)
return -ENODEV;
@@ -1093,8 +1204,10 @@ static int omap_aes_remove(struct platform_device *pdev)
list_del(&dd->list);
spin_unlock(&list_lock);
- for (i = 0; i < ARRAY_SIZE(algs); i++)
- crypto_unregister_alg(&algs[i]);
+ for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
+ for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
+ crypto_unregister_alg(
+ &dd->pdata->algs_info[i].algs_list[j]);
tasklet_kill(&dd->done_task);
tasklet_kill(&dd->queue_task);
--
1.7.12
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