hash: Plumb crc8 into the hash functions

Add an entry for crc8, with watchdog handling.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>

common/Kconfig

@@ -845,6 +845,14 @@ config HASH
 	  and the algorithms it supports are defined in common/hash.c. See
 	  also CMD_HASH for command-line access.
 
+config HASH_CRC8
+	bool "Make crc8 available via the hash API"
+	depends on HASH && CRC8
+	help
+	  Most times, the crc8() function is called directly. To make it also
+	  available via the hash API, e.g. in hash_block(), enable this
+	  option.
+
 config AVB_VERIFY
 	bool "Build Android Verified Boot operations"
 	depends on LIBAVB

common/hash.c

@@ -304,6 +304,14 @@ static struct hash_algo hash_algo[] = {
 		.hash_update	= hash_update_crc16_ccitt,
 		.hash_finish	= hash_finish_crc16_ccitt,
 	},
+#if CONFIG_IS_ENABLED(CRC8) && IS_ENABLED(CONFIG_HASH_CRC8)
+	{
+		.name		= "crc8",
+		.digest_size	= 1,
+		.chunk_size	= CHUNKSZ_CRC32,
+		.hash_func_ws	= crc8_wd_buf,
+	},
+#endif
 #if CONFIG_IS_ENABLED(CRC32)
 	{
 		.name		= "crc32",

include/u-boot/crc.h

@@ -25,6 +25,9 @@
  */
 unsigned int crc8(unsigned int crc_start, const unsigned char *vptr, int len);
 
+void crc8_wd_buf(const unsigned char *input, unsigned int len,
+		 unsigned char output[1], unsigned int chunk_sz);
+
 /* lib/crc16.c - 16 bit CRC with polynomial x^16 + x^15 + x^2 + 1 */
 uint16_t crc16(uint16_t crc, const unsigned char *buffer, size_t len);
 

lib/crc8.c

@@ -32,3 +32,9 @@ unsigned int crc8(unsigned int crc, const unsigned char *vptr, int len)
 
 	return crc;
 }
+
+void crc8_wd_buf(const unsigned char *input, unsigned int len,
+		 unsigned char output[1], unsigned int chunk_sz)
+{
+	*output = crc8(0, input, len);
+}