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authorBartlomiej Sieka <tur@semihalf.com>2008-04-22 12:27:56 +0200
committerWolfgang Denk <wd@denx.de>2008-04-25 00:01:06 +0200
commit215b01bba8bc662d35f72b084700b192d367dfb4 (patch)
tree339d9bea31b2cb37fc65c8b4c75e7597a11bba10 /lib_generic/sha1.c
parent8875e3abab986df930167ce5c1ac4f95dcacc81c (diff)
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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>
Diffstat (limited to 'lib_generic/sha1.c')
-rw-r--r--lib_generic/sha1.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/lib_generic/sha1.c b/lib_generic/sha1.c
index 08ffa6b..6950659 100644
--- a/lib_generic/sha1.c
+++ b/lib_generic/sha1.c
@@ -309,6 +309,39 @@ void sha1_csum (unsigned char *input, int ilen, unsigned char output[20])
}
/*
+ * Output = SHA-1( input buffer ). Trigger the watchdog every 'chunk_sz'
+ * bytes of input processed.
+ */
+void sha1_csum_wd (unsigned char *input, int ilen, unsigned char output[20],
+ unsigned int chunk_sz)
+{
+ sha1_context ctx;
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+ unsigned char *end, *curr;
+ int chunk;
+#endif
+
+ sha1_starts (&ctx);
+
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+ curr = input;
+ end = input + ilen;
+ while (curr < end) {
+ chunk = end - curr;
+ if (chunk > chunk_sz)
+ chunk = chunk_sz;
+ sha1_update (&ctx, curr, chunk);
+ curr += chunk;
+ WATCHDOG_RESET ();
+ }
+#else
+ sha1_update (&ctx, input, ilen);
+#endif
+
+ sha1_finish (&ctx, output);
+}
+
+/*
* Output = HMAC-SHA-1( input buffer, hmac key )
*/
void sha1_hmac (unsigned char *key, int keylen,