Provides get/set for affine coordinates on OpenSSL::PKey::EC::Point

[rickmark]

This implements #433

Provides OpenSSL::PKey::EC::Point#affine_coords and OpenSSL::PKey::EC::Point#affine_coords= for uncompressed coords taking either an Integer or a OpenSSL::BN for set and always returns an array of OpenSSL::BN for get.

It also implements OpenSSL::PKey::EC::Point#set_compressed_coords taking an Integer or a OpenSSL::BN for the value of X and an Integer that is directly passed to EC_POINT_set_compressed_coordinates. I feel like it should be checked for [0..1] but was simpler to pass the value directly.

[rickmark]

“Polyfill” patch is in progress to ensure that we can call get affine for either coordinate space

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From: Kazuki Yamaguchi @.> Sent: Wednesday, April 14, 2021 11:04:34 PM To: ruby/openssl @.> Cc: Rick Mark @.>; Author @.> Subject: Re: [ruby/openssl] Provides get/set for affine coordinates on OpenSSL::PKey::EC::Point (#435)

@rhenium commented on this pull request.

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In ext/openssl/extconf.rbhttps://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fruby%2Fopenssl%2Fpull%2F435%23discussion_r613778945&data=04%7C01%7C%7C21d0cb1270304c8e032b08d8ffd457d8%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637540634760103083%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=%2BbwZYVL9%2Bg0JezAXaYrkBMBW8l7wHxJPrWMTcc8lbJ4%3D&reserved=0:

@@ -174,6 +174,11 @@ def find_openssl_library have_func("EVP_PBE_scrypt") have_func("SSL_CTX_set_post_handshake_auth")

+# added in 1.1.1 +have_func("EC_POINT_get_affine_coordinates") +have_func("EC_POINT_set_affine_coordinates") +have_func("EC_POINT_set_compressed_coordinates")

I meant using the GFp and GF2m functions. They should both exist in OpenSSL <= 1.1.0 and LibreSSL.

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