feat: v1.2.2, digest type

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "swift-secure-enclave-tool-rs"
-version = "1.2.1"
+version = "1.2.2"
 edition = "2024"
 authors = ["Hatter Jiang"]
 repository = "https://git.hatter.ink/hatter/swift-secure-enclave-tool-rs"

src/lib.rs

@@ -40,7 +40,7 @@ pub enum DigestType {
 }
 
 impl DigestType {
-    fn to_str(&self) -> &'static str {
+    pub fn to_str(&self) -> &'static str {
         match self {
             DigestType::Raw => "raw",
             DigestType::Sha256 => "sha256",
@@ -48,6 +48,25 @@ impl DigestType {
             DigestType::Sha512 => "sha512",
         }
     }
+
+    pub fn bytes(&self) -> Option<u32> {
+        match self {
+            DigestType::Raw => None,
+            DigestType::Sha256 => Some(256 / 8),
+            DigestType::Sha384 => Some(384 / 8),
+            DigestType::Sha512 => Some(512 / 8),
+        }
+    }
+
+    pub fn parse(t: Option<&str>) -> XResult<DigestType> {
+        Ok(match t {
+            None | Some("") | Some("raw") => DigestType::Raw,
+            Some("sha256") => DigestType::Sha256,
+            Some("sha384") => DigestType::Sha384,
+            Some("sha512") => DigestType::Sha512,
+            Some(other_digest_type) => return simple_error!("Invalid digest type: {}", other_digest_type),
+        })
+    }
 }
 
 #[derive(Debug)]