diff --git a/crypto.cc b/crypto.cc
index dabaecd..d5e74ae 100644
--- a/crypto.cc
+++ b/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);
diff --git a/crypto.h b/crypto.h
index 9e11487..bb29483 100644
--- a/crypto.h
+++ b/crypto.h
@@ -7,7 +7,6 @@ class CryptoBase {
 		CryptoBase(const int fd);
 		virtual ~CryptoBase();
 
-		static std::string BinToHex(const std::string& bin);
 		static void GenKey(std::string* key);
 		static void GenKeyPair(std::string* secret_key, std::string* public_key);
 		virtual int OnReadable() = 0;
diff --git a/gen-key.cc b/gen-key.cc
index 95c0bf8..6cba2ff 100644
--- a/gen-key.cc
+++ b/gen-key.cc
@@ -19,8 +19,7 @@ int main(int argc, char *argv[]) {
 			std::cerr << "Failed to open key file" << std::endl;
 			return 1;
 		}
-		key_file << "# Shared secret key" << std::endl;
-		key_file << CryptoBase::BinToHex(key) << std::endl;
+		key_file << key;
 	}
 
 	return 0;
diff --git a/gen-keypair.cc b/gen-keypair.cc
index 324aa51..2f45fa8 100644
--- a/gen-keypair.cc
+++ b/gen-keypair.cc
@@ -19,8 +19,7 @@ int main(int argc, char *argv[]) {
 			std::cerr << "Failed to open secret key file" << std::endl;
 			return 1;
 		}
-		secret_key_file << "# Secret key" << std::endl;
-		secret_key_file << CryptoBase::BinToHex(secret_key) << std::endl;
+		secret_key_file << secret_key;
 	}
 
 	{
@@ -29,8 +28,7 @@ int main(int argc, char *argv[]) {
 			std::cerr << "Failed to open public key file" << std::endl;
 			return 1;
 		}
-		public_key_file << "# Public key" << std::endl;
-		public_key_file << CryptoBase::BinToHex(public_key) << std::endl;
+		public_key_file << public_key;
 	}
 
 	return 0;