From 215b01bba8bc662d35f72b084700b192d367dfb4 Mon Sep 17 00:00:00 2001
From: Bartlomiej Sieka <tur@semihalf.com>
Date: Tue, 22 Apr 2008 12:27:56 +0200
Subject: Add support for calculating hashes with watchdog triggering

Implement watchodg-aware variants of hash calculation functions:
- crc32_wd()
- md5_wd()
- sha1_csum_wd()
The above functions calculate the hash of the input buffer in chunks,
triggering the watchdog after processing each chunk. The chunk size
is given as a function call parameter.

Signed-off-by: Bartlomiej Sieka <tur@semihalf.com>
---
 include/common.h     |  1 +
 include/sha1.h       | 11 +++++++++++
 include/u-boot/md5.h |  8 ++++++++
 3 files changed, 20 insertions(+)

(limited to 'include')

diff --git a/include/common.h b/include/common.h
index fa1d0528e1..0ac1f80174 100644
--- a/include/common.h
+++ b/include/common.h
@@ -605,6 +605,7 @@ int	vsprintf(char *buf, const char *fmt, va_list args);
 
 /* lib_generic/crc32.c */
 uint32_t crc32 (uint32_t, const unsigned char *, uint);
+uint32_t crc32_wd (uint32_t, const unsigned char *, uint, uint);
 uint32_t crc32_no_comp (uint32_t, const unsigned char *, uint);
 
 /* common/console.c */
diff --git a/include/sha1.h b/include/sha1.h
index 15ea13cd3a..734d1fb153 100644
--- a/include/sha1.h
+++ b/include/sha1.h
@@ -79,6 +79,17 @@ void sha1_finish( sha1_context *ctx, unsigned char output[20] );
 void sha1_csum( unsigned char *input, int ilen,
 		unsigned char output[20] );
 
+/**
+ * \brief	   Output = SHA-1( input buffer ), with watchdog triggering
+ *
+ * \param input    buffer holding the  data
+ * \param ilen	   length of the input data
+ * \param output   SHA-1 checksum result
+ * \param chunk_sz watchdog triggering period (in bytes of input processed)
+ */
+void sha1_csum_wd (unsigned char *input, int ilen,
+		unsigned char output[20], unsigned int chunk_sz);
+
 /**
  * \brief	   Output = SHA-1( file contents )
  *
diff --git a/include/u-boot/md5.h b/include/u-boot/md5.h
index 046d1eee78..8b44a7f844 100644
--- a/include/u-boot/md5.h
+++ b/include/u-boot/md5.h
@@ -20,4 +20,12 @@ struct MD5Context {
  */
 void md5 (unsigned char *input, int len, unsigned char output[16]);
 
+/*
+ * Calculate and store in 'output' the MD5 digest of 'len' bytes at 'input'.
+ * 'output' must have enough space to hold 16 bytes. If 'chunk' Trigger the
+ * watchdog every 'chunk_sz' bytes of input processed.
+ */
+void md5_wd (unsigned char *input, int len, unsigned char output[16],
+		unsigned int chunk_sz);
+
 #endif /* _MD5_H */
-- 
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