Add destructors to all the types that need destructing

1 files changed, 9 insertions, 0 deletions

diff --git a/hash.rs b/hash.rs
index 2b964518..421cdc23 100644
--- a/hash.rs
+++ b/hash.rs
@@ -25,6 +25,7 @@ mod libcrypto {
     #[link_args = "-lcrypto"]
     extern {
         fn EVP_MD_CTX_create() -> EVP_MD_CTX;
+        fn EVP_MD_CTX_destroy(ctx: EVP_MD_CTX);
 
         fn EVP_md5() -> EVP_MD;
         fn EVP_sha1() -> EVP_MD;
@@ -96,6 +97,14 @@ impl Hasher {
     }
 }
 
+impl Drop for Hasher {
+    fn drop(&self) {
+        unsafe {
+            libcrypto::EVP_MD_CTX_destroy(self.ctx);
+        }
+    }
+}
+
 /**
  * Hashes the supplied input data using hash t, returning the resulting hash
  * value