1 files changed, 13 insertions, 6 deletions
diff --git a/ext/openssl/ossl_digest.c b/ext/openssl/ossl_digest.c
index 9b8ced5233..30478911ba 100644
--- a/ext/openssl/ossl_digest.c
+++ b/ext/openssl/ossl_digest.c
@@ -37,18 +37,25 @@ GetDigestPtr(VALUE obj)
 {
     const EVP_MD *md;
 
-    if (TYPE(obj) == T_STRING) {
-    	const char *name = StringValueCStr(obj);
+    if (TYPE(obj) == T_CLASS) {
+        EVP_MD_CTX *ctx;
+	VALUE digest = rb_funcall(obj, rb_intern("new"), 0, 0);
 
-        md = EVP_get_digestbyname(name);
-        if (!md)
-            ossl_raise(rb_eRuntimeError, "Unsupported digest algorithm (%s).", name);
-    } else {
+        SafeGetDigest(digest, ctx);
+
+        md = EVP_MD_CTX_md(ctx);
+    } else if (rb_obj_is_kind_of(obj, cDigest)) {
         EVP_MD_CTX *ctx;
 
         SafeGetDigest(obj, ctx);
 
         md = EVP_MD_CTX_md(ctx);
+    } else {
+    	const char *name = StringValueCStr(obj);
+
+        md = EVP_get_digestbyname(name);
+        if (!md)
+            ossl_raise(rb_eRuntimeError, "Unsupported digest algorithm (%s).", name);
     }
 
     return md;