If you GPG clearsign some UTF-8 encoded data, ruby-gpgme will raise in the IOCallbacks:
Encoding::UndefinedConversionError: "\xC3" from ASCII-8BIT to UTF-8
from /usr/lib/x86_64-linux-gnu/ruby/gems/2.4.0/gems/gpgme-2.0.2/lib/gpgme/io_callbacks.rb:12:in `write'
/usr/lib/x86_64-linux-gnu/ruby/gems/2.4.0/gems/gpgme-2.0.2/lib/gpgme/ctx.rb:417:in `gpgme_op_sign'
/usr/lib/x86_64-linux-gnu/ruby/gems/2.4.0/gems/gpgme-2.0.2/lib/gpgme/ctx.rb:417:in `sign'
...
The issue is that write_cb in the C extension does not associate an encoding with the string allocated with rb_str_new so the default is ASCII-8BIT. This string is then passed to IOCallbacks#write as buffer where it will have the ASCII-8BIT encoding associated with it. If the output @io object uses a different encoding, writing the buffer to that @io will raise as seen above.
To fix this, the string in the C extension would ideally at least be associated with the default internal encoding this way the app author can specify which encoding strings should be and everything will work as planned. Alternatively, you would add a method for library users to set the desired encoding to take precedence over the default internal encoding.
For an example of how to do this, you can check out the YAJL ruby code.
If you GPG clearsign some UTF-8 encoded data, ruby-gpgme will raise in the IOCallbacks:
The issue is that
write_cbin the C extension does not associate an encoding with the string allocated withrb_str_newso the default isASCII-8BIT. This string is then passed to IOCallbacks#write asbufferwhere it will have theASCII-8BITencoding associated with it. If the output@ioobject uses a different encoding, writing thebufferto that@iowill raise as seen above.To fix this, the string in the C extension would ideally at least be associated with the default internal encoding this way the app author can specify which encoding strings should be and everything will work as planned. Alternatively, you would add a method for library users to set the desired encoding to take precedence over the default internal encoding.
For an example of how to do this, you can check out the YAJL ruby code.