diff --git a/buzzback/src/digest.rs b/buzzback/src/digest.rs
deleted file mode 100644
index 32d6eab..0000000
--- a/buzzback/src/digest.rs
+++ /dev/null
@@ -1,20 +0,0 @@
-use http_digest_headers::{DigestHeader, DigestMethod};
-
-pub fn generate_header(body: &[u8]) -> Result<String, ()> {
-    let mut digest_header = DigestHeader::new()
-        .with_method(DigestMethod::SHA256, body)
-        .map(|h| format!("{}", h))
-        .map_err(|_| ())?;
-
-    // mastodon expects uppercase algo name
-    if digest_header.starts_with("sha-") {
-        digest_header.replace_range(..4, "SHA-");
-    }
-    // mastodon uses base64::alphabet::STANDARD, not base64::alphabet::URL_SAFE
-    digest_header.replace_range(
-        7..,
-        &digest_header[7..].replace('-', "+").replace('_', "/")
-    );
-
-    Ok(digest_header)
-}
diff --git a/buzzback/src/main.rs b/buzzback/src/main.rs
index b8a10d6..d06575e 100644
--- a/buzzback/src/main.rs
+++ b/buzzback/src/main.rs
@@ -7,7 +7,6 @@ mod error;
 mod config;
 mod db;
 mod activitypub;
-mod digest;
 mod send;
 
 async fn follow_back(
diff --git a/buzzback/src/send.rs b/buzzback/src/send.rs
index df79233..5649bc8 100644
--- a/buzzback/src/send.rs
+++ b/buzzback/src/send.rs
@@ -5,7 +5,8 @@ use std::{
 use http::StatusCode;
 use serde::Serialize;
 use sigh::{PrivateKey, SigningConfig, alg::RsaSha256};
-use crate::{digest, error::Error};
+use http_digest_headers::{DigestHeader, DigestMethod};
+use crate::error::Error;
 
 pub async fn send<T: Serialize>(
     client: &reqwest::Client,
@@ -21,6 +22,26 @@ pub async fn send<T: Serialize>(
     send_raw(client, uri, key_id, private_key, body).await
 }
 
+
+pub fn generate_digest_header(body: &[u8]) -> Result<String, ()> {
+    let mut digest_header = DigestHeader::new()
+        .with_method(DigestMethod::SHA256, body)
+        .map(|h| format!("{}", h))
+        .map_err(|_| ())?;
+
+    // mastodon expects uppercase algo name
+    if digest_header.starts_with("sha-") {
+        digest_header.replace_range(..4, "SHA-");
+    }
+    // mastodon uses base64::alphabet::STANDARD, not base64::alphabet::URL_SAFE
+    digest_header.replace_range(
+        7..,
+        &digest_header[7..].replace('-', "+").replace('_', "/")
+    );
+
+    Ok(digest_header)
+}
+
 pub async fn send_raw(
     client: &reqwest::Client,
     uri: &str,
@@ -31,7 +52,7 @@ pub async fn send_raw(
     let url = reqwest::Url::parse(uri)
         .map_err(|_| Error::InvalidUri)?;
     let host = format!("{}", url.host().ok_or(Error::InvalidUri)?);
-    let digest_header = digest::generate_header(&body)
+    let digest_header = generate_digest_header(&body)
         .map_err(|()| Error::Digest)?;
     let mut req = http::Request::builder()
         .method("POST")