[PATCH 4/5] image: Drop if/elseif hash selection in calculate_hash()

[Alexandru Gagniuc]

calculate_hash() would try to select the appropriate hashing function
by a if/elseif contruct. But that is exactly why hash_lookup_algo()
exists, so use it instead.

This does mean that we now have to 'select HASH' to make sure we get
the hash_lookup_algo() symbol. However, the change makes sense because
even basic FITs will have to deal with "hash" nodes.

My only concern is that the 'select SPL_HASH' might cause some
platform to grow above its SPL size allowance

Signed-off-by: Alexandru Gagniuc <mr.nuke.me at gmail.com>
---
 common/Kconfig.boot |  2 ++
 common/image-fit.c  | 45 +++++++++++++++++++--------------------------
 2 files changed, 21 insertions(+), 26 deletions(-)

diff --git a/common/Kconfig.boot b/common/Kconfig.boot
index 314f1e50a0..c2d6c89372 100644
--- a/common/Kconfig.boot
+++ b/common/Kconfig.boot
@@ -13,6 +13,7 @@ config FIT
 	bool "Support Flattened Image Tree"
 	select MD5
 	select SHA1
+	select HASH
 	help
 	  This option allows you to boot the new uImage structure,
 	  Flattened Image Tree.  FIT is formally a FDT, which can include
@@ -133,6 +134,7 @@ if SPL
 config SPL_FIT
 	bool "Support Flattened Image Tree within SPL"
 	depends on SPL
+	select SPL_HASH
 	select SPL_OF_LIBFDT
 
 config SPL_FIT_PRINT
diff --git a/common/image-fit.c b/common/image-fit.c
index aff4670be3..92d9141bcd 100644
--- a/common/image-fit.c
+++ b/common/image-fit.c
@@ -1193,6 +1193,12 @@ int fit_set_timestamp(void *fit, int noffset, time_t timestamp)
 	return 0;
 }
 
+static void crc32_uimage_fixup(void *value)
+{
+	/* TODO: In C, this type punning is undefined behavior: */
+	*((uint32_t *)value) = cpu_to_uimage(*((uint32_t *)value));
+}
+
 /**
  * calculate_hash - calculate and return hash for provided input data
  * @data: pointer to the input data
@@ -1211,37 +1217,24 @@ int fit_set_timestamp(void *fit, int noffset, time_t timestamp)
  *     0, on success
  *    -1, when algo is unsupported
  */
-int calculate_hash(const void *data, int data_len, const char *algo,
+int calculate_hash(const void *data, int data_len, const char *name,
 			uint8_t *value, int *value_len)
 {
-	if (IMAGE_ENABLE_CRC32 && strcmp(algo, "crc32") == 0) {
-		*((uint32_t *)value) = crc32_wd(0, data, data_len,
-							CHUNKSZ_CRC32);
-		*((uint32_t *)value) = cpu_to_uimage(*((uint32_t *)value));
-		*value_len = 4;
-	} else if (CONFIG_IS_ENABLED(SHA1) && strcmp(algo, "sha1") == 0) {
-		sha1_csum_wd((unsigned char *)data, data_len,
-			     (unsigned char *)value, CHUNKSZ_SHA1);
-		*value_len = 20;
-	} else if (CONFIG_IS_ENABLED(SHA256) && strcmp(algo, "sha256") == 0) {
-		sha256_csum_wd((unsigned char *)data, data_len,
-			       (unsigned char *)value, CHUNKSZ_SHA256);
-		*value_len = SHA256_SUM_LEN;
-	} else if (CONFIG_IS_ENABLED(SHA384) && strcmp(algo, "sha384") == 0) {
-		sha384_csum_wd((unsigned char *)data, data_len,
-			       (unsigned char *)value, CHUNKSZ_SHA384);
-		*value_len = SHA384_SUM_LEN;
-	} else if (CONFIG_IS_ENABLED(SHA512) && strcmp(algo, "sha512") == 0) {
-		sha512_csum_wd((unsigned char *)data, data_len,
-			       (unsigned char *)value, CHUNKSZ_SHA512);
-		*value_len = SHA512_SUM_LEN;
-	} else if (IMAGE_ENABLE_MD5 && strcmp(algo, "md5") == 0) {
-		md5_wd((unsigned char *)data, data_len, value, CHUNKSZ_MD5);
-		*value_len = 16;
-	} else {
+	struct hash_algo *algo;
+	int ret;
+
+	ret = hash_lookup_algo(name, &algo);
+	if (ret < 0) {
 		debug("Unsupported hash alogrithm\n");
 		return -1;
 	}
+
+	algo->hash_func_ws(data, data_len, value, algo->chunk_size);
+	*value_len = algo->digest_size;
+
+	if (!strcmp(name, "crc32"))
+		crc32_uimage_fixup(value);
+
 	return 0;
 }
 
-- 
2.31.1