Remove hex encoding, just write binary files.

crypto.cc

@@ -20,18 +20,6 @@ CryptoBase::~CryptoBase() {
 	}
 }
 
-std::string CryptoBase::BinToHex(const std::string& bin) {
-	static const char *hex = "0123456789ABCDEF";
-	std::string ret;
-	ret.reserve(bin.length() * 2);
-	for (size_t i = 0; i < bin.length(); i++) {
-		const char c = bin[i];
-		ret.push_back(hex[(c & 0xf0) >> 4]);
-		ret.push_back(hex[c & 0x0f]);
-	}
-	return ret;
-}
-
 void CryptoBase::GenKey(std::string* key) {
 	char buf[crypto_secretbox_KEYBYTES];
 	randombytes((unsigned char *)buf, crypto_secretbox_KEYBYTES);