diff --git a/Cargo.toml b/Cargo.toml
index 6400277..19aa25d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "external-command-rs"
-version = "0.1.2"
+version = "0.1.3"
 edition = "2024"
 authors = ["Hatter Jiang"]
 repository = "https://git.hatter.ink/hatter/external-command-rs"
diff --git a/src/lib.rs b/src/lib.rs
index d32934d..23a5a5c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -102,6 +102,16 @@ pub fn external_sign(
     parameter: &str,
     alg: &str,
     content: &[u8],
+) -> XResult<Vec<u8>> {
+    external_sign_digested(external_command, parameter, alg, content, "")
+}
+
+pub fn external_sign_digested(
+    external_command: &str,
+    parameter: &str,
+    alg: &str,
+    content: &[u8],
+    digest_type: &str,
 ) -> XResult<Vec<u8>> {
     let mut cmd = Command::new(external_command);
     cmd.arg("external_sign");
@@ -111,6 +121,10 @@ pub fn external_sign(
     cmd.arg(alg);
     cmd.arg("--message-base64");
     cmd.arg(STANDARD.encode(content));
+    if !digest_type.is_empty() && digest_type != "raw" {
+        cmd.arg("--message-type");
+        cmd.arg(digest_type);
+    }
 
     let cmd_stdout = run_command_stdout(cmd)?;
     parse_sign_result(&cmd_stdout)