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authorSimon Glass <sjg@chromium.org>2012-12-05 14:46:34 +0000
committerTom Rini <trini@ti.com>2012-12-11 13:17:33 -0700
commitec7381fbf6f77cc465eb06a1ab6f8a99df1e487c (patch)
treed352d38e00ee2cc7d404daa88842435df53a97d9 /lib/sha256.c
parenta7d1d765793a05c0d6f7547122339dbecc94f6c3 (diff)
sha256: Use const where possible and add watchdog function
In preparation for making the hash function common, we may as well use const where we can. Also add a watchdog version of the hashing function. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'lib/sha256.c')
-rw-r--r--lib/sha256.c37
1 files changed, 35 insertions, 2 deletions
diff --git a/lib/sha256.c b/lib/sha256.c
index deb63a40b6..ab2db4890a 100644
--- a/lib/sha256.c
+++ b/lib/sha256.c
@@ -60,7 +60,7 @@ void sha256_starts(sha256_context * ctx)
ctx->state[7] = 0x5BE0CD19;
}
-void sha256_process(sha256_context * ctx, uint8_t data[64])
+static void sha256_process(sha256_context *ctx, const uint8_t data[64])
{
uint32_t temp1, temp2;
uint32_t W[64];
@@ -191,7 +191,7 @@ void sha256_process(sha256_context * ctx, uint8_t data[64])
ctx->state[7] += H;
}
-void sha256_update(sha256_context * ctx, uint8_t * input, uint32_t length)
+void sha256_update(sha256_context *ctx, const uint8_t *input, uint32_t length)
{
uint32_t left, fill;
@@ -260,3 +260,36 @@ void sha256_finish(sha256_context * ctx, uint8_t digest[32])
PUT_UINT32_BE(ctx->state[6], digest, 24);
PUT_UINT32_BE(ctx->state[7], digest, 28);
}
+
+/*
+ * Output = SHA-256( input buffer ). Trigger the watchdog every 'chunk_sz'
+ * bytes of input processed.
+ */
+void sha256_csum_wd(const unsigned char *input, unsigned int ilen,
+ unsigned char *output, unsigned int chunk_sz)
+{
+ sha256_context ctx;
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+ unsigned char *end, *curr;
+ int chunk;
+#endif
+
+ sha256_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;
+ sha256_update(&ctx, curr, chunk);
+ curr += chunk;
+ WATCHDOG_RESET();
+ }
+#else
+ sha256_update(&ctx, input, ilen);
+#endif
+
+ sha256_finish(&ctx, output);
+}