Add a new rsa uclass for performing modular exponentiation and implement
the software driver basing on this uclass.
Signed-off-by: Ruchika Gupta <ruchika.gu...@freescale.com>
CC: Simon Glass <s...@chromium.org>
---
Changes in v5:
Changed UCLASS name to UCLASS_MOD_EXP
Changes in v4:
Removed Kconfig option for DM_RSA
Corrected driver name for sw rsa driver
Updated the rsa_mod_exp operation to have output length
Changes in v3:
New patch with driver model for RSA UCLASS
drivers/crypto/Makefile | 1 +
drivers/crypto/rsa_mod_exp/Kconfig | 5 ++++
drivers/crypto/rsa_mod_exp/Makefile | 7 ++++++
drivers/crypto/rsa_mod_exp/mod_exp_sw.c | 39 +++++++++++++++++++++++++++++
drivers/crypto/rsa_mod_exp/mod_exp_uclass.c | 31 +++++++++++++++++++++++
include/dm/uclass-id.h | 1 +
include/u-boot/rsa-mod-exp.h | 34 ++++++++++++++++++++++++-
7 files changed, 117 insertions(+), 1 deletion(-)
create mode 100644 drivers/crypto/rsa_mod_exp/Kconfig
create mode 100644 drivers/crypto/rsa_mod_exp/Makefile
create mode 100644 drivers/crypto/rsa_mod_exp/mod_exp_sw.c
create mode 100644 drivers/crypto/rsa_mod_exp/mod_exp_uclass.c
diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile
index 7b79237..fb8c10b 100644
--- a/drivers/crypto/Makefile
+++ b/drivers/crypto/Makefile
@@ -6,4 +6,5 @@
#
obj-$(CONFIG_EXYNOS_ACE_SHA) += ace_sha.o
+obj-y += rsa_mod_exp/
obj-y += fsl/
diff --git a/drivers/crypto/rsa_mod_exp/Kconfig
b/drivers/crypto/rsa_mod_exp/Kconfig
new file mode 100644
index 0000000..6dcb39a
--- /dev/null
+++ b/drivers/crypto/rsa_mod_exp/Kconfig
@@ -0,0 +1,5 @@
+config DM_MOD_EXP
+ bool "Enable Driver Model for RSA Modular Exponentiation"
+ depends on DM
+ help
+ If you want to use driver model for RSA Modular Exponentiation, say Y.
diff --git a/drivers/crypto/rsa_mod_exp/Makefile
b/drivers/crypto/rsa_mod_exp/Makefile
new file mode 100644
index 0000000..915b751
--- /dev/null
+++ b/drivers/crypto/rsa_mod_exp/Makefile
@@ -0,0 +1,7 @@
+#
+# (C) Copyright 2014 Freescale Semiconductor, Inc.
+#
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+obj-$(CONFIG_RSA) += mod_exp_uclass.o mod_exp_sw.o
diff --git a/drivers/crypto/rsa_mod_exp/mod_exp_sw.c
b/drivers/crypto/rsa_mod_exp/mod_exp_sw.c
new file mode 100644
index 0000000..dc6c064
--- /dev/null
+++ b/drivers/crypto/rsa_mod_exp/mod_exp_sw.c
@@ -0,0 +1,39 @@
+/*
+ * (C) Copyright 2014 Freescale Semiconductor, Inc.
+ * Author: Ruchika Gupta <ruchika.gu...@freescale.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <common.h>
+#include <dm.h>
+#include <u-boot/rsa-mod-exp.h>
+
+int mod_exp_sw(struct udevice *dev, const uint8_t *sig, uint32_t sig_len,
+ struct key_prop *prop, uint8_t *out)
+{
+ int ret = 0;
+
+ ret = rsa_mod_exp_sw(sig, sig_len, prop, out);
+ if (ret) {
+ debug("%s: RSA failed to verify: %d\n", __func__, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct mod_exp_ops mod_exp_ops_sw = {
+ .mod_exp = mod_exp_sw,
+};
+
+U_BOOT_DRIVER(mod_exp_sw) = {
+ .name = "mod_exp_sw",
+ .id = UCLASS_MOD_EXP,
+ .ops = &mod_exp_ops_sw,
+};
+
+U_BOOT_DEVICE(mod_exp_sw) = {
+ .name = "mod_exp_sw",
+};
diff --git a/drivers/crypto/rsa_mod_exp/mod_exp_uclass.c
b/drivers/crypto/rsa_mod_exp/mod_exp_uclass.c
new file mode 100644
index 0000000..266f094
--- /dev/null
+++ b/drivers/crypto/rsa_mod_exp/mod_exp_uclass.c
@@ -0,0 +1,31 @@
+/*
+ * (C) Copyright 2014 Freescale Semiconductor, Inc
+ * Author: Ruchika Gupta <ruchika.gu...@freescale.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <u-boot/rsa-mod-exp.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <malloc.h>
+#include <asm/io.h>
+#include <linux/list.h>
+
+int rsa_mod_exp(struct udevice *dev, const uint8_t *sig, uint32_t sig_len,
+ struct key_prop *node, uint8_t *out)
+{
+ const struct mod_exp_ops *ops = device_get_ops(dev);
+
+ if (!ops->mod_exp)
+ return -ENOSYS;
+
+ return ops->mod_exp(dev, sig, sig_len, node, out);
+}
+
+UCLASS_DRIVER(mod_exp) = {
+ .id = UCLASS_MOD_EXP,
+ .name = "rsa_mod_exp",
+};
diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index f17c3c2..91bb90d 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -33,6 +33,7 @@ enum uclass_id {
UCLASS_I2C, /* I2C bus */
UCLASS_I2C_GENERIC, /* Generic I2C device */
UCLASS_I2C_EEPROM, /* I2C EEPROM device */
+ UCLASS_MOD_EXP, /* RSA Mod Exp device */
UCLASS_COUNT,
UCLASS_INVALID = -1,
diff --git a/include/u-boot/rsa-mod-exp.h b/include/u-boot/rsa-mod-exp.h
index 59cd9ea..fce445a 100644
--- a/include/u-boot/rsa-mod-exp.h
+++ b/include/u-boot/rsa-mod-exp.h
@@ -35,9 +35,41 @@ struct key_prop {
* @sig: RSA PKCS1.5 signature
* @sig_len: Length of signature in number of bytes
* @node: Node with RSA key elements like modulus, exponent, R^2, n0inv
- * @out: Result in form of byte array
+ * @out: Result in form of byte array of len equal to sig_len
*/
int rsa_mod_exp_sw(const uint8_t *sig, uint32_t sig_len,
struct key_prop *node, uint8_t *out);
+int rsa_mod_exp(struct udevice *dev, const uint8_t *sig, uint32_t sig_len,
+ struct key_prop *node, uint8_t *out);
+
+/**
+ * struct struct mod_exp_ops - Driver model for RSA Modular Exponentiation
+ * operations
+ *
+ * The uclass interface is implemented by all crypto devices which use
+ * driver model.
+ */
+struct mod_exp_ops {
+ /**
+ * Perform Modular Exponentiation
+ *
+ * Operation: out[] = sig ^ exponent % modulus
+ *
+ * @dev: RSA Device
+ * @sig: RSA PKCS1.5 signature
+ * @sig_len: Length of signature in number of bytes
+ * @node: Node with RSA key elements like modulus, exponent,
+ * R^2, n0inv
+ * @out: Result in form of byte array of len equal to sig_len
+ *
+ * This function computes exponentiation over the signature.
+ * Returns: 0 if exponentiation is successful, or a negative value
+ * if it wasn't.
+ */
+ int (*mod_exp)(struct udevice *dev, const uint8_t *sig,
+ uint32_t sig_len, struct key_prop *node,
+ uint8_t *outp);
+};
+
#endif
--
1.8.1.4
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