ubi: ubifs: Add documentation for README

[karo-tx-uboot.git] / lib / sha256.c

diff --git a/lib/sha256.c b/lib/sha256.c
index deb63a40b6d7218145e807850ff51cce488a7e4b..ab2db4890ae7eb4bc432320bb2a044a0d56aa518 100644 (file)
--- 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);
+}