add license, remove unused code

src/builder.rs

@@ -1,3 +1,6 @@
+// Copyright 2020-2024 IOTA Stiftung
+// SPDX-License-Identifier: Apache-2.0
+
 use anyhow::Context as _;
 use itertools::Itertools;
 use serde::Serialize;
@@ -14,6 +17,7 @@ use crate::Result;
 use crate::SdJwt;
 use crate::SdJwtClaims;
 use crate::SdObjectEncoder;
+#[cfg(feature = "sha")]
 use crate::Sha256Hasher;
 use crate::DEFAULT_SALT_SIZE;
 use crate::HEADER_TYP;

src/encoder.rs

@@ -36,15 +36,11 @@ pub struct SdObjectEncoder<H> {
 impl TryFrom<Value> for SdObjectEncoder<Sha256Hasher> {
   type Error = crate::Error;
   fn try_from(value: Value) -> Result<Self> {
-    Self::with_custom_hasher(value, Sha256Hasher::new())
+    Self::with_custom_hasher_and_salt_size(value, Sha256Hasher::new(), DEFAULT_SALT_SIZE)
   }
 }
 
 impl<H: Hasher> SdObjectEncoder<H> {
-  /// Creates a new [`SdObjectEncoder`] with custom hash function to create digests.
-  pub fn with_custom_hasher(object: Value, hasher: H) -> Result<Self> {
-    Self::with_custom_hasher_and_salt_size(object, hasher, DEFAULT_SALT_SIZE)
-  }
   /// Creates a new [`SdObjectEncoder`] with custom hash function to create digests, and custom salt size.
   pub fn with_custom_hasher_and_salt_size(object: Value, hasher: H, salt_size: usize) -> Result<Self> {
     if !object.is_object() {

src/jwt.rs

@@ -1,3 +1,6 @@
+// Copyright 2020-2024 IOTA Stiftung
+// SPDX-License-Identifier: Apache-2.0
+
 use std::fmt::Display;
 use std::str::FromStr;
 

src/signer.rs

@@ -1,3 +1,6 @@
+// Copyright 2020-2024 IOTA Stiftung
+// SPDX-License-Identifier: Apache-2.0
+
 use std::error::Error;
 
 use async_trait::async_trait;