Add simple algorithm for converting result hash to password

lib/util/hashtopass.c

@@ -0,0 +1,18 @@
+#include "hashtopass.h"
+
+void hashtopass(char* p, size_t len, uint8_t* key)
+{
+	char* lowers = "abcdefghijklmnopqrstuvwxyz";
+	char* uppers = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+	char* numerals = "0123456789";
+	char* allchars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+
+	p[0] = lowers[key[0] % 26];
+	p[1] = numerals[key[1] % 10];
+	p[2] = uppers[key[2] % 26];
+
+	size_t i;
+	for (i = 3; i < len; i++)
+		p[i] = allchars[key[i] % (26 + 26 + 10)];
+	p[len] = '\0';
+}

lib/util/hashtopass.h

@@ -0,0 +1,12 @@
+#include "scrypt_platform.h"
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+#include <unistd.h>
+
+#include "warn.h"
+
+void hashtopass(char* p, size_t len, uint8_t* key);