Move sha256_generic into its own .o build output. Const-ify midstate param.

1 files changed, 56 insertions, 0 deletions

diff --git a/sha256_generic.c b/sha256_generic.c
index d622353..e778113 100644
--- a/sha256_generic.c
+++ b/sha256_generic.c
@@ -19,6 +19,10 @@
  */
 
 #include <stdint.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include "miner.h"
 
 typedef uint32_t u32;
 typedef uint8_t u8;
@@ -221,3 +225,55 @@ static void sha256_transform(u32 *state, const u8 *input)
 #endif
 }
 
+static void runhash(void *state, const void *input, const void *init)
+{
+	memcpy(state, init, 32);
+	sha256_transform(state, input);
+}
+
+const uint32_t sha256_init_state[8] = {
+	0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
+	0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
+};
+
+/* suspiciously similar to ScanHash* from bitcoin */
+bool scanhash_c(const unsigned char *midstate, unsigned char *data,
+	        unsigned char *hash1, unsigned char *hash,
+	        unsigned long *hashes_done)
+{
+	uint32_t *hash32 = (uint32_t *) hash;
+	uint32_t *nonce = (uint32_t *)(data + 12);
+	uint32_t n = 0;
+	unsigned long stat_ctr = 0;
+
+	while (1) {
+		n++;
+		*nonce = n;
+
+		runhash(hash1, data, midstate);
+		runhash(hash, hash1, sha256_init_state);
+
+		stat_ctr++;
+
+		if (hash32[7] == 0) {
+			char *hexstr;
+
+			hexstr = bin2hex(hash, 32);
+			fprintf(stderr,
+				"DBG: found zeroes in hash:\n%s\n",
+				hexstr);
+			free(hexstr);
+
+			*hashes_done = stat_ctr;
+			return true;
+		}
+
+		if ((n & 0xffffff) == 0) {
+			if (opt_debug)
+				fprintf(stderr, "DBG: end of nonce range\n");
+			*hashes_done = stat_ctr;
+			return false;
+		}
+	}
+}
+