DM: crypto/rsa_mod_exp: Add rsa Modular Exponentiation DM driver

Add a new rsa uclass for performing modular exponentiation and implement
the software driver basing on this uclass.

Signed-off-by: Ruchika Gupta <ruchika.gupta@freescale.com>
CC: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile
index 7b792371811eb37e7dadcf39310e65f955237678..fb8c10b38c2fd4537a1fa94dfc75faf737b5cfef 100644 (file)
--- 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 (file)
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 (file)
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 (file)
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.gupta@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 (file)
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.gupta@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 f17c3c2b384dfc8aa782583fa0734cb31a77d222..91bb90dcfb3044196907da15b3b83efb2c2dd07c 100644 (file)
--- 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 59cd9ea2d86826147598769e3bbea93e5b2e43a3..fce445a082a2f9ea28353d080243d2d6bf070c3b 100644 (file)
--- 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