fix #140. properly size char buffer for encryption
fix #140. properly size char buffer for encryption

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