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>

drivers/mmc/Kconfig

@@ -130,6 +130,7 @@ config MMC_HW_PARTITIONING
 config SUPPORT_EMMC_RPMB
 	bool "Support eMMC replay protected memory block (RPMB)"
 	imply CMD_MMC_RPMB
+	select SHA256
 	help
 	  Enable support for reading, writing and programming the
 	  key for the Replay Protection Memory Block partition in eMMC.

include/u-boot/md5.h

@@ -6,10 +6,16 @@
 #ifndef _MD5_H
 #define _MD5_H
 
+#if defined(CONFIG_MBEDTLS_LIB_CRYPTO)
+#include <mbedtls/md5.h>
+#endif
 #include "compiler.h"
 
 #define MD5_SUM_LEN	16
 
+#if defined(CONFIG_MBEDTLS_LIB_CRYPTO)
+typedef mbedtls_md5_context MD5Context;
+#else
 typedef struct MD5Context {
 	__u32 buf[4];
 	__u32 bits[2];
@@ -18,6 +24,7 @@ typedef struct MD5Context {
 		__u32 in32[16];
 	};
 } MD5Context;
+#endif
 
 void MD5Init(MD5Context *ctx);
 void MD5Update(MD5Context *ctx, unsigned char const *buf, unsigned int len);

include/u-boot/sha1.h

@@ -16,6 +16,21 @@
 
 #include <linux/types.h>
 
+#if defined(CONFIG_MBEDTLS_LIB_CRYPTO)
+/*
+ * FIXME:
+ * MbedTLS define the members of "mbedtls_sha256_context" as private,
+ * but "state" needs to be access by arch/arm/cpu/armv8/sha1_ce_glue.
+ * MBEDTLS_ALLOW_PRIVATE_ACCESS needs to be enabled to allow the external
+ * access.
+ * Directly including <external/mbedtls/library/common.h> is not allowed,
+ * since this will include <malloc.h> and break the sandbox test.
+ */
+#define MBEDTLS_ALLOW_PRIVATE_ACCESS
+
+#include <mbedtls/sha1.h>
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -26,6 +41,9 @@ extern "C" {
 
 extern const uint8_t sha1_der_prefix[];
 
+#if defined(CONFIG_MBEDTLS_LIB_CRYPTO)
+typedef mbedtls_sha1_context sha1_context;
+#else
 /**
  * \brief	   SHA-1 context structure
  */
@@ -36,13 +54,14 @@ typedef struct
     unsigned char buffer[64];	/*!< data block being processed */
 }
 sha1_context;
+#endif
 
 /**
  * \brief	   SHA-1 context setup
  *
  * \param ctx	   SHA-1 context to be initialized
  */
-void sha1_starts( sha1_context *ctx );
+void sha1_starts(sha1_context *ctx);
 
 /**
  * \brief	   SHA-1 process buffer

include/u-boot/sha256.h

@@ -3,6 +3,22 @@
 
 #include <linux/types.h>
 
+#if defined(CONFIG_MBEDTLS_LIB_CRYPTO)
+/*
+ * FIXME:
+ * MbedTLS define the members of "mbedtls_sha256_context" as private,
+ * but "state" needs to be access by arch/arm/cpu/armv8/sha256_ce_glue.
+ * MBEDTLS_ALLOW_PRIVATE_ACCESS needs to be enabled to allow the external
+ * access.
+ * Directly including <external/mbedtls/library/common.h> is not allowed,
+ * since this will include <malloc.h> and break the sandbox test.
+ */
+#define MBEDTLS_ALLOW_PRIVATE_ACCESS
+
+#include <mbedtls/sha256.h>
+#endif
+
+#define SHA224_SUM_LEN	28
 #define SHA256_SUM_LEN	32
 #define SHA256_DER_LEN	19
 
@@ -11,11 +27,15 @@ extern const uint8_t sha256_der_prefix[];
 /* Reset watchdog each time we process this many bytes */
 #define CHUNKSZ_SHA256	(64 * 1024)
 
+#if defined(CONFIG_MBEDTLS_LIB_CRYPTO)
+typedef mbedtls_sha256_context sha256_context;
+#else
 typedef struct {
 	uint32_t total[2];
 	uint32_t state[8];
 	uint8_t buffer[64];
 } sha256_context;
+#endif
 
 void sha256_starts(sha256_context * ctx);
 void sha256_update(sha256_context *ctx, const uint8_t *input, uint32_t length);

include/u-boot/sha512.h

@@ -3,6 +3,10 @@
 
 #include <linux/types.h>
 
+#if defined(CONFIG_MBEDTLS_LIB_CRYPTO)
+#include <mbedtls/sha512.h>
+#endif
+
 #define SHA384_SUM_LEN          48
 #define SHA384_DER_LEN          19
 #define SHA512_SUM_LEN          64
@@ -12,11 +16,16 @@
 #define CHUNKSZ_SHA384	(16 * 1024)
 #define CHUNKSZ_SHA512	(16 * 1024)
 
+#if defined(CONFIG_MBEDTLS_LIB_CRYPTO)
+typedef mbedtls_sha512_context sha384_context;
+typedef mbedtls_sha512_context sha512_context;
+#else
 typedef struct {
 	uint64_t state[SHA512_SUM_LEN / 8];
 	uint64_t count[2];
 	uint8_t buf[SHA512_BLOCK_SIZE];
 } sha512_context;
+#endif
 
 extern const uint8_t sha512_der_prefix[];
 

lib/Makefile

@@ -50,7 +50,6 @@ obj-$(CONFIG_XXHASH) += xxhash.o
 obj-y += net_utils.o
 obj-$(CONFIG_PHYSMEM) += physmem.o
 obj-y += rc4.o
-obj-$(CONFIG_SUPPORT_EMMC_RPMB) += sha256.o
 obj-$(CONFIG_RBTREE)	+= rbtree.o
 obj-$(CONFIG_BITREVERSE) += bitrev.o
 obj-y += list_sort.o
@@ -71,14 +70,16 @@ obj-$(CONFIG_$(SPL_TPL_)CRC16) += crc16.o
 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_$(SPL_)MD5_LEGACY) += md5.o
-obj-$(CONFIG_$(SPL_)SHA512) += sha512.o
+obj-$(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
 

lib/mbedtls/Kconfig

@@ -20,9 +20,100 @@ if LEGACY_CRYPTO || MBEDTLS_LIB_CRYPTO_ALT
 
 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