Kconfig: Add CONFIG_HASH to enable hashing API

At present CONFIG_CMD_HASH enables the 'hash' command which also brings
in the hashing API. Some boards may wish to enable the API without the
command. Add a separate CONFIG to permit this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

cmd/Kconfig

@@ -350,6 +350,7 @@ config CMD_MEMORY
 
 config CMD_CRC32
 	bool "crc32"
+	select HASH
 	default y
 	help
 	  Compute CRC32.
@@ -998,6 +999,7 @@ config CMD_BLOB
 
 config CMD_HASH
 	bool "Support 'hash' command"
+	select HASH
 	help
 	  This provides a way to hash data in memory using various supported
 	  algorithms (such as SHA1, MD5, CRC32). The computed digest can be

common/Kconfig

@@ -493,4 +493,16 @@ config BOARD_EARLY_INIT_F
 
 endmenu
 
+menu "Security support"
+
+config HASH
+	bool # "Support hashing API (SHA1, SHA256, etc.)"
+	help
+	  This provides a way to hash data in memory using various supported
+	  algorithms (such as SHA1, MD5, CRC32). The API is defined in hash.h
+	  and the algorithms it supports are defined in common/hash.c. See
+	  also CMD_HASH for command-line access.
+
+endmenu
+
 source "common/spl/Kconfig"

common/Makefile

@@ -10,7 +10,7 @@ ifndef CONFIG_SPL_BUILD
 obj-y += init/
 obj-y += main.o
 obj-y += exports.o
-obj-y += hash.o
+obj-$(CONFIG_HASH) += hash.o
 obj-$(CONFIG_HUSH_PARSER) += cli_hush.o
 obj-$(CONFIG_AUTOBOOT) += autoboot.o
 

common/hash.c

@@ -473,5 +473,5 @@ int hash_command(const char *algo_name, int flags, cmd_tbl_t *cmdtp, int flag,
 
 	return 0;
 }
-#endif
+#endif /* CONFIG_CMD_HASH || CONFIG_CMD_SHA1SUM || CONFIG_CMD_CRC32) */
-#endif
+#endif /* !USE_HOSTCC */