determine operation type by isinstance on the key
determine operation type by isinstance on the key

kimvais/cryptography,kimvais/cryptography,bwhmather/cryptography,kimvais/cryptography,Hasimir/cryptography,Ayrx/cryptography,Hasimir/cryptography,Hasimir/cryptography,sholsapp/cryptography,dstufft/cryptography,dstufft/cryptography,Ayrx/cryptography,bwhmather/cryptography,kimvais/cryptography,sholsapp/cryptography,skeuomorf/cryptography,sholsapp/cryptography,dstufft/cryptography,Ayrx/cryptography,sholsapp/cryptography,dstufft/cryptography,bwhmather/cryptography,dstufft/cryptography,skeuomorf/cryptography,Hasimir/cryptography,skeuomorf/cryptography,bwhmather/cryptography,Ayrx/cryptography,skeuomorf/cryptography