diff --git a/src/ec/ecdsa.ts b/src/ec/ecdsa.ts
index d6c72c5..b3f8bd4 100644
--- a/src/ec/ecdsa.ts
+++ b/src/ec/ecdsa.ts
@@ -5,7 +5,7 @@ export abstract class EcdsaProvider extends EllipticProvider {
 
   public readonly name: string = "ECDSA";
 
-  public readonly hashAlgorithms = ["SHA-1", "SHA-256", "SHA-384", "SHA-512"];
+  public readonly hashAlgorithms = ["SHA-1", "SHA-256", "SHA-384", "SHA-512", "NO-HASH"];
 
   public usages: ProviderKeyUsages = {
     privateKey: ["sign"],