Test the symmetric encryption doc snippets using doctest
Test the symmetric encryption doc snippets using doctest

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