diff --git a/verifier/src/lib.rs b/verifier/src/lib.rs
index 04f5f0d..2c1da40 100644
--- a/verifier/src/lib.rs
+++ b/verifier/src/lib.rs
@@ -229,6 +229,26 @@ impl PkiPathSignatureVerifier {
     }
 }
 
+pub fn verify_signature(
+    alias: &Certificate,
+    hash: &[u8],
+    signature: &[u8; 64],
+) -> Result<()> {
+    use ed25519_dalek::{Signature, Verifier, VerifyingKey};
+
+    let signature = Signature::from_bytes(signature);
+
+    let alias = alias
+        .tbs_certificate
+        .subject_public_key_info
+        .subject_public_key
+        .as_bytes()
+        .ok_or_else(|| anyhow!("Invalid / unaligned public key"))?;
+
+    let verifying_key = VerifyingKey::from_bytes(alias.try_into()?)?;
+    Ok(verifying_key.verify(&hash, &signature)?)
+}
+
 pub fn verify_attestation(
     alias: &Certificate,
     attestation: &Attestation,