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-rw-r--r--ext/digest/lib/digest/hmac.rb7
1 files changed, 7 insertions, 0 deletions
diff --git a/ext/digest/lib/digest/hmac.rb b/ext/digest/lib/digest/hmac.rb
index 1948352c4b..98f98a69cf 100644
--- a/ext/digest/lib/digest/hmac.rb
+++ b/ext/digest/lib/digest/hmac.rb
@@ -4,6 +4,11 @@
#
# == Overview
#
+# CAUTION: Use of this library is discouraged, because this
+# implementation was meant to be experimental but somehow got into the
+# 1.9 series without being noticed. Please use OpenSSL::HMAC in the
+# "openssl" library instead.
+#
# This library adds a method named hmac() to Digest classes, which
# creates a Digest class for calculating HMAC digests.
#
@@ -36,6 +41,8 @@
# $Id$
#
+warn "use of the experimetal library 'digest/hmac' is discouraged; require 'openssl' and use OpenSSL::HMAC instead." if $VERBOSE
+
require 'digest'
module Digest