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-rw-r--r--include/sha256.h8
-rw-r--r--lib/sha256.c37
2 files changed, 42 insertions, 3 deletions
diff --git a/include/sha256.h b/include/sha256.h
index e38ea89..beadab3 100644
--- a/include/sha256.h
+++ b/include/sha256.h
@@ -3,6 +3,9 @@
#define SHA256_SUM_LEN 32
+/* Reset watchdog each time we process this many bytes */
+#define CHUNKSZ_SHA256 (64 * 1024)
+
typedef struct {
uint32_t total[2];
uint32_t state[8];
@@ -10,7 +13,10 @@ typedef struct {
} sha256_context;
void sha256_starts(sha256_context * ctx);
-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);
void sha256_finish(sha256_context * ctx, uint8_t digest[SHA256_SUM_LEN]);
+void sha256_csum_wd(const unsigned char *input, unsigned int ilen,
+ unsigned char *output, unsigned int chunk_sz);
+
#endif /* _SHA256_H */
diff --git a/lib/sha256.c b/lib/sha256.c
index deb63a4..ab2db48 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);
+}