diff --git a/src/algorithm.rs b/src/algorithm.rs
index 053c853..e490b91 100644
--- a/src/algorithm.rs
+++ b/src/algorithm.rs
@@ -21,7 +21,7 @@ impl Algorithm {
 
 impl Default for Algorithm {
 	fn default() -> Self {
-		Self::Rsa2048Sha256
+		crate::DEFAULT_CNF_ALGORITHM
 	}
 }
 
diff --git a/src/canonicalization.rs b/src/canonicalization.rs
index b90460e..e943a21 100644
--- a/src/canonicalization.rs
+++ b/src/canonicalization.rs
@@ -6,12 +6,6 @@ pub enum CanonicalizationType {
 	Simple,
 }
 
-impl Default for CanonicalizationType {
-	fn default() -> Self {
-		Self::Relaxed
-	}
-}
-
 impl ToString for CanonicalizationType {
 	fn to_string(&self) -> String {
 		match self {
@@ -33,7 +27,7 @@ impl FromStr for CanonicalizationType {
 	}
 }
 
-#[derive(Clone, Copy, Debug, Default)]
+#[derive(Clone, Copy, Debug)]
 pub struct Canonicalization {
 	header_alg: CanonicalizationType,
 	body_alg: CanonicalizationType,
@@ -65,6 +59,15 @@ impl Canonicalization {
 	}
 }
 
+impl Default for Canonicalization {
+	fn default() -> Self {
+		Self {
+			header_alg: crate::DEFAULT_CNF_CANONICALIZATION_HEADER,
+			body_alg: crate::DEFAULT_CNF_CANONICALIZATION_BODY,
+		}
+	}
+}
+
 impl ToString for Canonicalization {
 	fn to_string(&self) -> String {
 		format!(
diff --git a/src/config.rs b/src/config.rs
index 769c149..dd659ea 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -26,15 +26,15 @@ pub struct Config {
 	header: Vec<String>,
 	#[arg(short = 'o', long)]
 	header_optional: Vec<String>,
-	#[arg(short = 'p', long, default_value_t = NonZeroU64::new(15552000).unwrap())]
+	#[arg(short = 'p', long, default_value_t = NonZeroU64::new(crate::DEFAULT_CNF_CRYPTOPERIOD).unwrap())]
 	cryptoperiod: NonZeroU64,
-	#[arg(short, long, default_value_t = 1728000)]
+	#[arg(short, long, default_value_t = crate::DEFAULT_CNF_REVOCATION)]
 	revocation: u64,
 	#[arg(short = 'u', long)]
 	dns_update_cmd: String,
 	#[arg(short, long, action = clap::ArgAction::Count)]
 	verbose: u8,
-	#[arg(short = 'x', long, default_value_t = 1296000)]
+	#[arg(short = 'x', long, default_value_t = crate::DEFAULT_CNF_EXPIRATION)]
 	expiration: u64,
 }
 
@@ -43,8 +43,8 @@ impl Config {
 		let mut cnf = Self::parse();
 		cnf.key_data_base = process_key_data_base(cnf.key_data_base);
 		cnf.domain = process_domains(&cnf.domain, &cnf.domain_file)?;
-		cnf.header = process_headers(&cnf.header, crate::DEFAULT_HEADERS);
-		cnf.header_optional = process_headers(&cnf.header_optional, crate::DEFAULT_HEADERS_OPT);
+		cnf.header = process_headers(&cnf.header, crate::DEFAULT_CNF_HEADERS);
+		cnf.header_optional = process_headers(&cnf.header_optional, crate::DEFAULT_CNF_HEADERS_OPT);
 		Ok(cnf)
 	}
 
@@ -107,9 +107,11 @@ impl Config {
 fn process_key_data_base(opt: Option<PathBuf>) -> Option<PathBuf> {
 	match opt {
 		Some(p) => Some(p),
-		None => Some(PathBuf::from(
-			"/var/lib/opensmtpd-filter-dkimout/key-db.sqlite3",
-		)),
+		None => {
+			let mut path = PathBuf::from(crate::DEFAULT_LIB_DIR);
+			path.push(crate::DEFAULT_CNF_KEY_DB);
+			Some(path)
+		}
 	}
 }
 
diff --git a/src/main.rs b/src/main.rs
index 3cc5909..e5c5f04 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,14 +7,24 @@ mod logs;
 mod message;
 mod stdin_reader;
 
+use algorithm::Algorithm;
+use canonicalization::CanonicalizationType;
 use entry::Entry;
 use message::Message;
 use std::collections::HashMap;
 use stdin_reader::StdinReader;
 
 const DEFAULT_BUFF_SIZE: usize = 1024;
-const DEFAULT_HEADERS: &str = "from:reply-to:subject:date:to:cc";
-const DEFAULT_HEADERS_OPT: &str = "resent-date:resent-from:resent-to:resent-cc:in-reply-to:references:list-id:list-help:list-unsubscribe:list-subscribe:list-post:list-owner:list-archive";
+const DEFAULT_CNF_ALGORITHM: Algorithm = Algorithm::Rsa2048Sha256;
+const DEFAULT_CNF_CANONICALIZATION_BODY: CanonicalizationType = CanonicalizationType::Relaxed;
+const DEFAULT_CNF_CANONICALIZATION_HEADER: CanonicalizationType = CanonicalizationType::Relaxed;
+const DEFAULT_CNF_CRYPTOPERIOD: u64 = 15552000;
+const DEFAULT_CNF_EXPIRATION: u64 = 1296000;
+const DEFAULT_CNF_HEADERS: &str = "from:reply-to:subject:date:to:cc";
+const DEFAULT_CNF_HEADERS_OPT: &str = "resent-date:resent-from:resent-to:resent-cc:in-reply-to:references:list-id:list-help:list-unsubscribe:list-subscribe:list-post:list-owner:list-archive";
+const DEFAULT_CNF_KEY_DB: &str = "key-db.sqlite3";
+const DEFAULT_CNF_REVOCATION: u64 = 1728000;
+const DEFAULT_LIB_DIR: &str = "/var/lib/opensmtpd-filter-dkimout";
 const DEFAULT_MSG_SIZE: usize = 1024 * 1024;
 const LOG_LEVEL_ENV_VAR: &str = "OPENSMTPD_FILTER_DKIMOUT_LOG_LEVEL";