Make public key opt in decrypt when openssl gem >= 2.2.0 #364
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In PKCS7 RFC, the recipient certificate is not mandatory when decrypting. This is also how it is implemented in OpenSSL PKCS7_decrypt(). However, it is only since version 2.2.0 of ruby-openssl that it is possible to call OpenSSL::PKCS7#decrypt with only the private key. Ref: ruby/openssl#183
The issue of hiera-eyaml requiring the public key when decrypting has been brought before in #137, but ruby-openssl was yet patched.