[U-Boot] [PATCH 4/4] [RFC] rsa: Use checksum algorithms from struct hash_algo

[Ruchika Gupta]

Currently the hash functions used in RSA are called
directly from the sha1 and sha256 libraries.
Change the RSA checksum library to use the progressive
hash API's registered with struct hash_algo. This will
allow the checksum library to use the support of hardware
accelerated progressive hash API's once available.

Signed-off-by: Ruchika Gupta <ruchika.gupta at freescale.com>
CC: Simon Glass <sjg at chromium.org>
---
 include/image.h               |  2 +-
 include/u-boot/rsa-checksum.h |  4 +--
 lib/rsa/rsa-checksum.c        | 61 ++++++++++++++++++++++++++++++++++++++++---
 3 files changed, 60 insertions(+), 7 deletions(-)

diff --git a/include/image.h b/include/image.h
index af30d60..0067c75 100644
--- a/include/image.h
+++ b/include/image.h
@@ -926,7 +926,7 @@ struct checksum_algo {
 #if IMAGE_ENABLE_SIGN
 	const EVP_MD *(*calculate_sign)(void);
 #endif
-	void (*calculate)(const struct image_region region[],
+	int (*calculate)(const struct image_region region[],
 			  int region_count, uint8_t *checksum);
 	const uint8_t *rsa_padding;
 };
diff --git a/include/u-boot/rsa-checksum.h b/include/u-boot/rsa-checksum.h
index c996fb3..db55046 100644
--- a/include/u-boot/rsa-checksum.h
+++ b/include/u-boot/rsa-checksum.h
@@ -16,9 +16,9 @@ extern const uint8_t padding_sha256_rsa4096[];
 extern const uint8_t padding_sha256_rsa2048[];
 extern const uint8_t padding_sha1_rsa2048[];
 
-void sha256_calculate(const struct image_region region[], int region_count,
+int sha256_calculate(const struct image_region region[], int region_count,
 		      uint8_t *checksum);
-void sha1_calculate(const struct image_region region[], int region_count,
+int sha1_calculate(const struct image_region region[], int region_count,
 		    uint8_t *checksum);
 
 #endif
diff --git a/lib/rsa/rsa-checksum.c b/lib/rsa/rsa-checksum.c
index 8d8b59f..af27c97 100644
--- a/lib/rsa/rsa-checksum.c
+++ b/lib/rsa/rsa-checksum.c
@@ -10,12 +10,13 @@
 #include <asm/byteorder.h>
 #include <asm/errno.h>
 #include <asm/unaligned.h>
+#include <hash.h>
 #else
 #include "fdt_host.h"
-#endif
-#include <u-boot/rsa.h>
 #include <u-boot/sha1.h>
 #include <u-boot/sha256.h>
+#endif
+#include <u-boot/rsa.h>
 
 /* PKCS 1.5 paddings as described in the RSA PKCS#1 v2.1 standard. */
 
@@ -136,7 +137,54 @@ const uint8_t padding_sha256_rsa4096[RSA4096_BYTES - SHA256_SUM_LEN] = {
 	0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20
 };
 
-void sha1_calculate(const struct image_region region[], int region_count,
+#ifndef USE_HOSTCC
+void hash_calculate(struct hash_algo *algo, const struct image_region region[],
+		   int region_count, uint8_t *checksum)
+{
+	void *ctx;
+	uint32_t i;
+	i = 0;
+
+	algo->hash_init(algo, &ctx);
+	for (i = 0; i < region_count - 1; i++)
+		algo->hash_update(algo, ctx, region[i].data, region[i].size, 0);
+
+	algo->hash_update(algo, ctx, region[i].data, region[i].size, 1);
+	algo->hash_finish(algo, ctx, checksum, algo->digest_size);
+}
+
+int sha1_calculate(const struct image_region region[], int region_count,
+		    uint8_t *checksum)
+{
+	struct hash_algo *algo;
+	int ret = 0;
+
+	ret = hash_progressive_lookup_algo("sha1", &algo);
+	if (ret)
+		return ret;
+
+	hash_calculate(algo, region, region_count, checksum);
+
+	return 0;
+}
+
+int sha256_calculate(const struct image_region region[], int region_count,
+		    uint8_t *checksum)
+{
+	struct hash_algo *algo;
+	int ret;
+
+	ret = hash_progressive_lookup_algo("sha256", &algo);
+	if (ret)
+		return ret;
+
+	hash_calculate(algo, region, region_count, checksum);
+
+	return 0;
+}
+
+#else
+int sha1_calculate(const struct image_region region[], int region_count,
 		    uint8_t *checksum)
 {
 	sha1_context ctx;
@@ -147,9 +195,11 @@ void sha1_calculate(const struct image_region region[], int region_count,
 	for (i = 0; i < region_count; i++)
 		sha1_update(&ctx, region[i].data, region[i].size);
 	sha1_finish(&ctx, checksum);
+
+	return 0;
 }
 
-void sha256_calculate(const struct image_region region[], int region_count,
+int sha256_calculate(const struct image_region region[], int region_count,
 		      uint8_t *checksum)
 {
 	sha256_context ctx;
@@ -160,4 +210,7 @@ void sha256_calculate(const struct image_region region[], int region_count,
 	for (i = 0; i < region_count; i++)
 		sha256_update(&ctx, region[i].data, region[i].size);
 	sha256_finish(&ctx, checksum);
+
+	return 0;
 }
+#endif
-- 
1.8.1.4