Merge pull request #1107 from geesun/qx/add_ecdsa_support

Add support for TBBR using ECDSA keys in ARM platforms

docs/auth-framework.rst

@@ -921,9 +921,12 @@ three functions:
     int verify_hash(void *data_ptr, unsigned int data_len,
                     void *digest_info_ptr, unsigned int digest_info_len);
 
-The key algorithm (rsa, ecdsa) must be specified in the build system using the
-``TF_MBEDTLS_KEY_ALG`` variable, so the Makefile can include the corresponding
-sources in the build.
+The mbedTLS library algorithm support is configured by the
+``TF_MBEDTLS_KEY_ALG`` variable which can take in 3 values: `rsa`, `ecdsa` or
+`rsa+ecdsa`. This variable allows the Makefile to include the corresponding
+sources in the build for the various algorthms. Setting the variable to
+`rsa+ecdsa` enables support for both rsa and ecdsa algorithms in the mbedTLS
+library.
 
 Note: If code size is a concern, the build option ``MBEDTLS_SHA256_SMALLER`` can
 be defined in the platform Makefile. It will make mbed TLS use an implementation
@@ -931,7 +934,7 @@ of SHA-256 with smaller memory footprint (~1.5 KB less) but slower (~30%).
 
 --------------
 
-*Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.*
+*Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.*
 
 .. _Trusted Board Boot: ./trusted-board-boot.rst
 .. _Platform Porting Guide: ./porting-guide.rst

docs/user-guide.rst

@@ -643,6 +643,11 @@ ARM development platform specific build options
       ``arm_rotpk_rsa.der``, located in ``plat/arm/board/common/rotpk``. To use
       this option, ``arm_rotprivk_rsa.pem`` must be specified as ``ROT_KEY`` when
       creating the certificates.
+   -  ``devel_ecdsa`` : return a development public key hash embedded in the BL1
+      and BL2 binaries. This hash has been obtained from the ECDSA public key
+      ``arm_rotpk_ecdsa.der``, located in ``plat/arm/board/common/rotpk``. To use
+      this option, ``arm_rotprivk_ecdsa.pem`` must be specified as ``ROT_KEY``
+      when creating the certificates.
 
 -  ``ARM_TSP_RAM_LOCATION``: location of the TSP binary. Options:
 
@@ -990,6 +995,10 @@ images with support for these features:
       in the ARM platform port. The private/public RSA key pair may be
       found in ``plat/arm/board/common/rotpk``.
 
+   -  ``ARM_ROTPK_LOCATION=devel_ecdsa``: use the ROTPK hash that is hardcoded
+      in the ARM platform port. The private/public ECDSA key pair may be
+      found in ``plat/arm/board/common/rotpk``.
+
    Example of command line using RSA development keys:
 
    ::

drivers/auth/mbedtls/mbedtls_common.c

@@ -14,8 +14,9 @@
 /*
  * mbed TLS heap
  */
-#if (TF_MBEDTLS_KEY_ALG_ID == TF_MBEDTLS_ECDSA)
-#define MBEDTLS_HEAP_SIZE		(14*1024)
+#if (TF_MBEDTLS_KEY_ALG_ID == TF_MBEDTLS_ECDSA) \
+	|| (TF_MBEDTLS_KEY_ALG_ID == TF_MBEDTLS_RSA_AND_ECDSA)
+#define MBEDTLS_HEAP_SIZE		(13*1024)
 #elif (TF_MBEDTLS_KEY_ALG_ID == TF_MBEDTLS_RSA)
 #define MBEDTLS_HEAP_SIZE		(7*1024)
 #endif

drivers/auth/mbedtls/mbedtls_crypto.mk

@@ -41,18 +41,26 @@ MBEDTLS_CRYPTO_SOURCES		:=	drivers/auth/mbedtls/mbedtls_crypto.c	\
 					)
 
 # Key algorithm specific files
+MBEDTLS_ECDSA_CRYPTO_SOURCES	+=	$(addprefix ${MBEDTLS_DIR}/library/,	\
+					ecdsa.c					\
+					ecp_curves.c				\
+					ecp.c					\
+					)
+
+MBEDTLS_RSA_CRYPTO_SOURCES	+=	$(addprefix ${MBEDTLS_DIR}/library/,	\
+					rsa.c					\
+					)
+
 ifeq (${TF_MBEDTLS_KEY_ALG},ecdsa)
-    MBEDTLS_CRYPTO_SOURCES	+=	$(addprefix ${MBEDTLS_DIR}/library/,	\
-    					ecdsa.c					\
-    					ecp_curves.c				\
-    					ecp.c					\
-    					)
+    MBEDTLS_CRYPTO_SOURCES	+=	$(MBEDTLS_ECDSA_CRYPTO_SOURCES)
     TF_MBEDTLS_KEY_ALG_ID	:=	TF_MBEDTLS_ECDSA
 else ifeq (${TF_MBEDTLS_KEY_ALG},rsa)
-    MBEDTLS_CRYPTO_SOURCES	+=	$(addprefix ${MBEDTLS_DIR}/library/,	\
-    					rsa.c					\
-    					)
+    MBEDTLS_CRYPTO_SOURCES	+=	$(MBEDTLS_RSA_CRYPTO_SOURCES)
     TF_MBEDTLS_KEY_ALG_ID	:=	TF_MBEDTLS_RSA
+else ifeq (${TF_MBEDTLS_KEY_ALG},rsa+ecdsa)
+    MBEDTLS_CRYPTO_SOURCES	+=	$(MBEDTLS_ECDSA_CRYPTO_SOURCES)
+    MBEDTLS_CRYPTO_SOURCES	+=	$(MBEDTLS_RSA_CRYPTO_SOURCES)
+    TF_MBEDTLS_KEY_ALG_ID	:=	TF_MBEDTLS_RSA_AND_ECDSA
 else
     $(error "TF_MBEDTLS_KEY_ALG=${TF_MBEDTLS_KEY_ALG} not supported on mbed TLS")
 endif

include/drivers/auth/mbedtls/mbedtls_config.h

@@ -9,8 +9,9 @@
 /*
  * Key algorithms currently supported on mbed TLS libraries
  */
-#define TF_MBEDTLS_RSA		1
-#define TF_MBEDTLS_ECDSA	2
+#define TF_MBEDTLS_RSA			1
+#define TF_MBEDTLS_ECDSA		2
+#define TF_MBEDTLS_RSA_AND_ECDSA	3
 
 /*
  * Configuration file to build mbed TLS with the required features for
@@ -30,7 +31,6 @@
 #define MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
 #define MBEDTLS_X509_CHECK_KEY_USAGE
 #define MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE
-#define MBEDTLS_X509_RSASSA_PSS_SUPPORT
 
 #define MBEDTLS_ASN1_PARSE_C
 #define MBEDTLS_ASN1_WRITE_C
@@ -56,6 +56,13 @@
 #define MBEDTLS_ECP_DP_SECP256R1_ENABLED
 #elif (TF_MBEDTLS_KEY_ALG_ID == TF_MBEDTLS_RSA)
 #define MBEDTLS_RSA_C
+#define MBEDTLS_X509_RSASSA_PSS_SUPPORT
+#elif (TF_MBEDTLS_KEY_ALG_ID == TF_MBEDTLS_RSA_AND_ECDSA)
+#define MBEDTLS_RSA_C
+#define MBEDTLS_X509_RSASSA_PSS_SUPPORT
+#define MBEDTLS_ECDSA_C
+#define MBEDTLS_ECP_C
+#define MBEDTLS_ECP_DP_SECP256R1_ENABLED
 #endif
 
 #define MBEDTLS_SHA256_C

include/plat/arm/board/common/board_arm_def.h

@@ -64,7 +64,7 @@
  * PLAT_ARM_MAX_BL1_RW_SIZE is calculated using the current BL1 RW debug size
  * plus a little space for growth.
  */
-#define PLAT_ARM_MAX_BL1_RW_SIZE	0xA000
+#define PLAT_ARM_MAX_BL1_RW_SIZE	0xB000
 
 /*
  * PLAT_ARM_MAX_BL2_SIZE is calculated using the current BL2 debug size plus a

plat/arm/board/common/board_arm_trusted_boot.c

@@ -18,6 +18,7 @@
 /* ROTPK locations */
 #define ARM_ROTPK_REGS_ID		1
 #define ARM_ROTPK_DEVEL_RSA_ID		2
+#define ARM_ROTPK_DEVEL_ECDSA_ID	3
 
 static const unsigned char rotpk_hash_hdr[] =		\
 		"\x30\x31\x30\x0D\x06\x09\x60\x86\x48"	\
@@ -41,6 +42,12 @@ static const unsigned char arm_devel_rotpk_hash[] =	\
 		"\x37\x7A\x72\x47\x1B\xEC\x32\x73"	\
 		"\xE9\x92\x32\xE2\x49\x59\xF6\x5E"	\
 		"\x8B\x4A\x4A\x46\xD8\x22\x9A\xDA";
+#elif (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_ECDSA_ID)
+static const unsigned char arm_devel_rotpk_hash[] =	\
+		"\x2E\x40\xBF\x6E\xF9\x12\xBB\x98"	\
+		"\x31\x71\x09\x0E\x1E\x15\x3D\x0B"	\
+		"\xFD\xD1\xCC\x69\x4A\x98\xEB\x8B"	\
+		"\xA0\xB0\x20\x86\x4E\x6C\x07\x17";
 #endif
 
 /*
@@ -69,7 +76,8 @@ int plat_get_rotpk_info(void *cookie, void **key_ptr, unsigned int *key_len,
 	memcpy(rotpk_hash_der, rotpk_hash_hdr, rotpk_hash_hdr_len);
 	dst = (uint8_t *)&rotpk_hash_der[rotpk_hash_hdr_len];
 
-#if (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_RSA_ID)
+#if (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_RSA_ID) \
+	|| (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_ECDSA_ID)
 	memcpy(dst, arm_devel_rotpk_hash, SHA256_BYTES);
 #elif (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_REGS_ID)
 	uint32_t *src, tmp;
@@ -121,7 +129,8 @@ int plat_get_rotpk_info(void *cookie, void **key_ptr, unsigned int *key_len,
 		*dst++ = (uint8_t)((tmp >> 8) & 0xFF);
 		*dst++ = (uint8_t)(tmp & 0xFF);
 	}
-#endif /* (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_RSA_ID) */
+#endif /* (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_RSA_ID) \
+		  || (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_ECDSA_ID) */
 
 	*key_ptr = (void *)rotpk_hash_der;
 	*key_len = (unsigned int)sizeof(rotpk_hash_der);

plat/arm/board/common/board_common.mk

 #
-# Copyright (c) 2015-2016, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -22,7 +22,11 @@ ifneq (${TRUSTED_BOARD_BOOT},0)
     ifeq (${ARM_ROTPK_LOCATION}, regs)
         ARM_ROTPK_LOCATION_ID = ARM_ROTPK_REGS_ID
     else ifeq (${ARM_ROTPK_LOCATION}, devel_rsa)
+        KEY_ALG := rsa
         ARM_ROTPK_LOCATION_ID = ARM_ROTPK_DEVEL_RSA_ID
+    else ifeq (${ARM_ROTPK_LOCATION}, devel_ecdsa)
+        KEY_ALG := ecdsa
+        ARM_ROTPK_LOCATION_ID = ARM_ROTPK_DEVEL_ECDSA_ID
     else
         $(error "Unsupported ARM_ROTPK_LOCATION value")
     endif

plat/arm/board/common/rotpk/arm_rotpk_ecdsa_sha256.bin

+.@n1q	=iJ닠 Nl
\ No newline at end of file

plat/arm/board/common/rotpk/arm_rotprivk_ecdsa.pem

+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEINSaX6nvzS3teiBJA7WlTLRKJOajpy29o2cArLbUXoZBoAoGCCqGSM49
+AwEHoUQDQgAEm+ZIvTQ44aKk83DhVLsvsFpKDP/Ch9vA+4Hp+fmVfX6gDH8K1OBi
+SpRf7FJ9RGPIn2H6xst+a1OtLMWUDRqGkQ==
+-----END EC PRIVATE KEY-----

plat/arm/board/juno/include/platform_def.h

@@ -96,7 +96,7 @@
  * plus a little space for growth.
  */
 #if TRUSTED_BOARD_BOOT
-# define PLAT_ARM_MAX_BL1_RW_SIZE	0x9000
+# define PLAT_ARM_MAX_BL1_RW_SIZE	0xA000
 #else
 # define PLAT_ARM_MAX_BL1_RW_SIZE	0x6000
 #endif
@@ -106,7 +106,7 @@
  * little space for growth.
  */
 #if TRUSTED_BOARD_BOOT
-# define PLAT_ARM_MAX_BL2_SIZE		0x18000
+# define PLAT_ARM_MAX_BL2_SIZE		0x19000
 #else
 # define PLAT_ARM_MAX_BL2_SIZE		0xC000
 #endif
@@ -114,8 +114,12 @@
 /*
  * PLAT_ARM_MAX_BL31_SIZE is calculated using the current BL31 debug size plus a
  * little space for growth.
+ * SCP_BL2 image is loaded into the space BL31 -> BL1_RW_BASE.
+ * For TBB use case, PLAT_ARM_MAX_BL1_RW_SIZE has been increased and therefore
+ * PLAT_ARM_MAX_BL31_SIZE has been increased to ensure SCP_BL2 has the same
+ * space available.
  */
-#define PLAT_ARM_MAX_BL31_SIZE		0x1D000
+#define PLAT_ARM_MAX_BL31_SIZE		0x1E000
 
 /*
  * Since free SRAM space is scant, enable the ASSERTION message size

plat/arm/board/juno/platform.mk

@@ -91,6 +91,3 @@ include plat/arm/common/arm_common.mk
 include plat/arm/soc/common/soc_css.mk
 include plat/arm/css/common/css_common.mk
 
-ifeq (${KEY_ALG},ecdsa)
-    $(error "ECDSA key algorithm is not fully supported on Juno.")
-endif