lib: Adapt digest header files to MbedTLS

Adapt digest header files to support both original libs and MbedTLS
by switching on/off MBEDTLS_LIB_CRYPTO.
Introduce <alg>_LEGACY kconfig for legacy hash implementations.
sha256.o should depend on SHA256 kconfig only but not SUPPORT_EMMC_RPMB,
SHA256 should be selected when SUPPORT_EMMC_RPMB is enabled instead.

`IS_ENABLED` or `CONFIG_IS_ENABLED` is not applicable here, since
including <linux/kconfig.h> causes undefined reference on schedule()
with sandbox build, as <linux/kconfig.h> includes <generated/autoconf.h>
which enables `CONFIG_HW_WATCHDOG` and `CONFIG_WATCHDOG` but no schedule()
are defined in sandbox build,
Thus we use `#if defined(CONFIG_MBEDTLS_LIB_CRYPTO)` instead.

Signed-off-by: Raymond Mao <raymond.mao@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/lib/Makefile b/lib/Makefile
index c4950b7..3375577 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -50,7 +50,6 @@
 obj-y += net_utils.o
 obj-$(CONFIG_PHYSMEM) += physmem.o
 obj-y += rc4.o
-obj-$(CONFIG_SUPPORT_EMMC_RPMB) += sha256.o
 obj-$(CONFIG_RBTREE)	+= rbtree.o
 obj-$(CONFIG_BITREVERSE) += bitrev.o
 obj-y += list_sort.o
@@ -71,14 +70,16 @@
 obj-y += crypto/
 
 obj-$(CONFIG_$(SPL_TPL_)ACPI) += acpi/
-obj-$(CONFIG_$(SPL_)MD5) += md5.o
 obj-$(CONFIG_ECDSA) += ecdsa/
 obj-$(CONFIG_$(SPL_)RSA) += rsa/
 obj-$(CONFIG_HASH) += hash-checksum.o
 obj-$(CONFIG_BLAKE2) += blake2/blake2b.o
-obj-$(CONFIG_$(SPL_)SHA1) += sha1.o
-obj-$(CONFIG_$(SPL_)SHA256) += sha256.o
-obj-$(CONFIG_$(SPL_)SHA512) += sha512.o
+
+obj-$(CONFIG_$(SPL_)MD5_LEGACY) += md5.o
+obj-$(CONFIG_$(SPL_)SHA1_LEGACY) += sha1.o
+obj-$(CONFIG_$(SPL_)SHA256_LEGACY) += sha256.o
+obj-$(CONFIG_$(SPL_)SHA512_LEGACY) += sha512.o
+
 obj-$(CONFIG_CRYPT_PW) += crypt/
 obj-$(CONFIG_$(SPL_)ASN1_DECODER) += asn1_decoder.o
 
diff --git a/lib/mbedtls/Kconfig b/lib/mbedtls/Kconfig
index 9d1a63c..8a7b3a3 100644
--- a/lib/mbedtls/Kconfig
+++ b/lib/mbedtls/Kconfig
@@ -20,9 +20,100 @@
 
 config LEGACY_CRYPTO_BASIC
 	bool "legacy basic crypto libraries"
+	select MD5_LEGACY if MD5
+	select SHA1_LEGACY if SHA1
+	select SHA256_LEGACY if SHA256
+	select SHA512_LEGACY if SHA512
+	select SHA384_LEGACY if SHA384
+	select SPL_MD5_LEGACY if SPL_MD5
+	select SPL_SHA1_LEGACY if SPL_SHA1
+	select SPL_SHA256_LEGACY if SPL_SHA256
+	select SPL_SHA512_LEGACY if SPL_SHA512
+	select SPL_SHA384_LEGACY if SPL_SHA384
 	help
 	  Enable legacy basic crypto libraries.
 
+if LEGACY_CRYPTO_BASIC
+
+config SHA1_LEGACY
+	bool "Enable SHA1 support with legacy crypto library"
+	depends on LEGACY_CRYPTO_BASIC && SHA1
+	help
+	  This option enables support of hashing using SHA1 algorithm
+	  with legacy crypto library.
+
+config SHA256_LEGACY
+	bool "Enable SHA256 support with legacy crypto library"
+	depends on LEGACY_CRYPTO_BASIC && SHA256
+	help
+	  This option enables support of hashing using SHA256 algorithm
+	  with legacy crypto library.
+
+config SHA512_LEGACY
+	bool "Enable SHA512 support with legacy crypto library"
+	depends on LEGACY_CRYPTO_BASIC && SHA512
+	default y if TI_SECURE_DEVICE && FIT_SIGNATURE
+	help
+	  This option enables support of hashing using SHA512 algorithm
+	  with legacy crypto library.
+
+config SHA384_LEGACY
+	bool "Enable SHA384 support with legacy crypto library"
+	depends on LEGACY_CRYPTO_BASIC && SHA384
+	select SHA512_LEGACY
+	help
+	  This option enables support of hashing using SHA384 algorithm
+	  with legacy crypto library.
+
+config MD5_LEGACY
+	bool "Enable MD5 support with legacy crypto library"
+	depends on LEGACY_CRYPTO_BASIC && MD5
+	help
+	  This option enables support of hashing using MD5 algorithm
+	  with legacy crypto library.
+
+if SPL
+
+config SPL_SHA1_LEGACY
+	bool "Enable SHA1 support in SPL with legacy crypto library"
+	depends on LEGACY_CRYPTO_BASIC && SPL_SHA1
+	help
+	  This option enables support of hashing using SHA1 algorithm
+	  with legacy crypto library.
+
+config SPL_SHA256_LEGACY
+	bool "Enable SHA256 support in SPL with legacy crypto library"
+	depends on LEGACY_CRYPTO_BASIC && SPL_SHA256
+	help
+	  This option enables support of hashing using SHA256 algorithm
+	  with legacy crypto library.
+
+config SPL_SHA512_LEGACY
+	bool "Enable SHA512 support in SPL with legacy crypto library"
+	depends on LEGACY_CRYPTO_BASIC && SPL_SHA512
+	help
+	  This option enables support of hashing using SHA512 algorithm
+	  with legacy crypto library.
+
+config SPL_SHA384_LEGACY
+	bool "Enable SHA384 support in SPL with legacy crypto library"
+	depends on LEGACY_CRYPTO_BASIC && SPL_SHA384
+	select SPL_SHA512_LEGACY
+	help
+	  This option enables support of hashing using SHA384 algorithm
+	  with legacy crypto library.
+
+config SPL_MD5_LEGACY
+	bool "Enable MD5 support in SPL with legacy crypto library"
+	depends on LEGACY_CRYPTO_BASIC && SPL_MD5
+	help
+	  This option enables support of hashing using MD5 algorithm
+	  with legacy crypto library.
+
+endif # SPL
+
+endif # LEGACY_CRYPTO_BASIC
+
 config LEGACY_CRYPTO_CERT
 	bool "legacy certificate libraries"
 	help