1 files changed, 42 insertions, 8 deletions

diff --git a/checker/src/revhash/main.c b/checker/src/revhash/main.c
index f872e33..0c35ce4 100644
--- a/checker/src/revhash/main.c
+++ b/checker/src/revhash/main.c
@@ -4,22 +4,42 @@
 #include <stdint.h>
 
 #define MAXITER   256 * 100
+#define MHASHLEN  40
 #define MAX(x,y)  ((x) > (y) ? (x) : (y))
 #define MIN(x,y)  ((x) < (y) ? (x) : (y))
 
 int
-main(int argc, const char **argv)
+hash()
 {
-	const char *hashstr;
-	char c, hexbuf[3] = { 0 }, *end, *buf;
-	int i, k, v, maxlen, sum, *hash, sublen, aftersum;
+	static char buf[MHASHLEN + 1];
+	char str[256];
+	int i, k, v;
+	char c, *bp;
+	size_t len;
 
-	if (argc < 2) {
-		fprintf(stderr, "USAGE: revhash <hash>\n");
+	if (!fgets(str, sizeof(str), stdin))
 		return EXIT_FAILURE;
-	}
 
-	hashstr = argv[1];
+	len = strlen(str) -1;
+	if (len <= 0) return EXIT_FAILURE;
+
+	for (v = 0, i = 0; i < len; i++) v += str[i];
+
+	srand(v);
+	for (bp = buf, i = 0; i < MHASHLEN / 2; i++)
+		bp += sprintf(bp, "%02x", str[i % len] ^ (rand() % 256));
+
+	printf("%s\n", buf);
+
+	return EXIT_SUCCESS;
+}
+
+int
+revhash(const char *hashstr)
+{
+	char c, hexbuf[3] = { 0 }, *end, *buf;
+	int i, k, v, maxlen, sum, *hash, sublen, aftersum;
+
 	if (strlen(hashstr) % 2 != 0)
 		goto invalid;
 
@@ -78,3 +98,17 @@ invalid:
 	fprintf(stderr, "Invalid hash string!\n");
 	return EXIT_FAILURE;
 }
+
+int
+main(int argc, const char **argv)
+{
+	if (argc < 2) {
+		fprintf(stderr, "USAGE: revhash <hash>\n");
+		return EXIT_FAILURE;
+	}
+
+	if (!strcmp(argv[1], "hash"))
+		return hash();
+	else
+		return revhash(argv[1]);
+}