[ruby/openssl] pkey: implement #to_text using EVP API

Use EVP_PKEY_print_private() instead of the low-level API *_print()
functions, such as RSA_print().

EVP_PKEY_print_*() family was added in OpenSSL 1.0.0.

Note that it falls back to EVP_PKEY_print_public() and
EVP_PKEY_print_params() as necessary. This is required for EVP_PKEY_DH
type for which _private() fails if the private component is not set in
the pkey object.

Since the new API works in the same way for all key types, we now
implement #to_text in the base class OpenSSL::PKey::PKey rather than in
each subclass.

https://github.com/ruby/openssl/commit/e0b4c56956

1 files changed, 5 insertions, 0 deletions

diff --git a/test/openssl/test_pkey.rb b/test/openssl/test_pkey.rb
index 0a516f98e8..4a539d8c46 100644
--- a/test/openssl/test_pkey.rb
+++ b/test/openssl/test_pkey.rb
@@ -169,4 +169,9 @@ class OpenSSL::TestPKey < OpenSSL::PKeyTestCase
       key1.compare?(key4)
     end
   end
+
+  def test_to_text
+    rsa = Fixtures.pkey("rsa1024")
+    assert_include rsa.to_text, "publicExponent"
+  end
 end