openpgp: New function S2K::is_supported.

1 files changed, 11 insertions, 0 deletions

diff --git a/openpgp/src/crypto/s2k.rs b/openpgp/src/crypto/s2k.rs
index 1210aa8b..b58da5d3 100644
--- a/openpgp/src/crypto/s2k.rs
+++ b/openpgp/src/crypto/s2k.rs
@@ -213,6 +213,17 @@ impl S2K {
         }
     }
 
+    /// Returns whether this S2K mechanism is supported.
+    pub fn is_supported(&self) -> bool {
+        use self::S2K::*;
+        #[allow(deprecated)]
+        match self {
+            Simple { .. } | Salted { .. } | Iterated { .. } => true,
+            __Nonexhaustive => unreachable!(),
+            _ => false,
+        }
+    }
+
     /// This function returns an encodable iteration count.
     ///
     /// Not all iteration counts are encodable as *Iterated and Salted