Add types for working with OpenPGP.

  - Add KeyId to identify keys.

2 files changed, 22 insertions, 0 deletions

diff --git a/src/openpgp/mod.rs b/src/openpgp/mod.rs
index d0175ea5..683b8448 100644
--- a/src/openpgp/mod.rs
+++ b/src/openpgp/mod.rs
@@ -4,5 +4,6 @@
 // wrong place).  Hence, that here as well.
 
 pub mod parse;
+pub mod types;
 
 include!("openpgp.rs");
diff --git a/src/openpgp/types.rs b/src/openpgp/types.rs
new file mode 100644
index 00000000..5ad32631
--- /dev/null
+++ b/src/openpgp/types.rs
@@ -0,0 +1,21 @@
+//! Types for working with OpenPGP.
+
+/// Uniquely identifies OpenPGP keys.
+pub struct KeyId(u64);
+
+impl KeyId {
+    /// Returns a KeyID with the given `id`.
+    pub fn new(id: u64) -> KeyId {
+        KeyId(id)
+    }
+
+    /// Returns a KeyID with the given `id` encoded as hexadecimal string.
+    pub fn from_hex(id: &str) -> Option<KeyId> {
+        u64::from_str_radix(id, 16).ok().map(|id| Self::new(id))
+    }
+
+    /// Returns a hexadecimal representation of the key id.
+    pub fn as_hex(&self) -> String {
+        format!("{:x}", self.0)
+    }
+}