diff --git a/ChangeLog b/ChangeLog
index 3996e476b2..0b499fd5dc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu May 19 07:47:26 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
+
+	* test/openssl/test_pkey_rsa.rb: Add tests for sign/verify.
+
 Thu May 19 07:19:16 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
 
 	* ext/openssl/ossl_pkey.c: Add documentation.
diff --git a/test/openssl/test_pkey_rsa.rb b/test/openssl/test_pkey_rsa.rb
index 39b65e889b..8592f0efa0 100644
--- a/test/openssl/test_pkey_rsa.rb
+++ b/test/openssl/test_pkey_rsa.rb
@@ -48,6 +48,37 @@ class OpenSSL::TestPKeyRSA < Test::Unit::TestCase
     assert_equal([], OpenSSL.errors)
   end
 
+  def test_sign_verify
+    key = OpenSSL::PKey::RSA.new(512)
+    digest = OpenSSL::Digest::SHA1.new
+    data = 'Sign me!'
+    sig = key.sign(digest, data)
+    assert(key.verify(digest, sig, data))
+  end
+
+  def test_digest_state_irrelevant_sign
+    key = OpenSSL::PKey::RSA.new(512)
+    digest1 = OpenSSL::Digest::SHA1.new
+    digest2 = OpenSSL::Digest::SHA1.new
+    data = 'Sign me!'
+    digest1 << 'Change state of digest1'
+    sig1 = key.sign(digest1, data)
+    sig2 = key.sign(digest2, data)
+    assert_equal(sig1, sig2)
+  end
+
+  def test_digest_state_irrelevant_verify
+    key = OpenSSL::PKey::RSA.new(512)
+    digest1 = OpenSSL::Digest::SHA1.new
+    digest2 = OpenSSL::Digest::SHA1.new
+    data = 'Sign me!'
+    sig = key.sign(digest1, data)
+    digest1.reset
+    digest1 << 'Change state of digest1'
+    assert(key.verify(digest1, sig, data))
+    assert(key.verify(digest2, sig, data))
+  end
+
   def test_read_RSAPublicKey
     modulus = 10664264882656732240315063514678024569492171560814833397008094754351396057398262071307709191731289492697968568138092052265293364132872019762410446076526351
     exponent = 65537