Fixes ROTPK hash generation for ECDSA encryption

Forced hash generation used to always generate hash via RSA encryption.
This patch changes encryption based on ARM_ROTPK_LOCATION.
Also removes setting KEY_ALG based on ARM_ROTPL_LOCATION - there is no
relation between these two.
Signed-off-by: Max Shvetsov <maksims.svecovs@arm.com>
Change-Id: Id727d2ed06176a243719fd0adfa0cae26c325005

plat/arm/board/common/board_common.mk

@@ -17,7 +17,7 @@ ifneq (${ARM_CRYPTOCELL_INTEG}, 1)
 ifeq (${ARM_ROTPK_LOCATION}, regs)
 	ARM_ROTPK_LOCATION_ID = ARM_ROTPK_REGS_ID
 else ifeq (${ARM_ROTPK_LOCATION}, devel_rsa)
-	KEY_ALG := rsa
+	CRYPTO_ALG=rsa
 	ARM_ROTPK_LOCATION_ID = ARM_ROTPK_DEVEL_RSA_ID
 	ARM_ROTPK_HASH = plat/arm/board/common/rotpk/arm_rotpk_rsa_sha256.bin
 $(eval $(call add_define_val,ARM_ROTPK_HASH,'"$(ARM_ROTPK_HASH)"'))
@@ -25,7 +25,7 @@ $(BUILD_PLAT)/bl2/arm_dev_rotpk.o : $(ARM_ROTPK_HASH)
 $(warning Development keys support for FVP is deprecated. Use `regs` \
 option instead)
 else ifeq (${ARM_ROTPK_LOCATION}, devel_ecdsa)
-	KEY_ALG := ecdsa
+	CRYPTO_ALG=ec
 	ARM_ROTPK_LOCATION_ID = ARM_ROTPK_DEVEL_ECDSA_ID
 	ARM_ROTPK_HASH = plat/arm/board/common/rotpk/arm_rotpk_ecdsa_sha256.bin
 $(eval $(call add_define_val,ARM_ROTPK_HASH,'"$(ARM_ROTPK_HASH)"'))
@@ -50,7 +50,7 @@ $(ARM_ROTPK_HASH) : $(HASH_PREREQUISITES)
 ifndef ROT_KEY
 	$(error Cannot generate hash: no ROT_KEY defined)
 endif
-	openssl rsa -in $< -pubout -outform DER | openssl dgst \
+	openssl ${CRYPTO_ALG} -in $< -pubout -outform DER | openssl dgst \
 		-sha256 -binary > $@
 
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