optional functionality for writing results to the single file and extracting specific keys from it

base64.h

@@ -0,0 +1,11 @@
+// converts src[0:slen] to base64 string
+char *base64_to(char *dst,const u8 *src,size_t slen);
+// calculates length needed to store data converted to base64
+#define BASE64_TO_LEN(l) (((l + 3 - 1) / 3) * 4)
+// converts src string from base64
+size_t base64_from(u8 *dst,const char *src,size_t slen);
+// calculates length needed to store data converted from base
+#define BASE64_FROM_LEN(l) ((l) / 4 * 3)
+// validates base32 string and optionally stores length of valid data
+// returns 1 if whole string is good, 0 if string contains invalid data
+int base64_valid(const char *src,size_t *count);