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It seems both -kfile and -pass can be used to encrypt files with a 2048 bit keyfile? I don't understand the difference between the two methods:

$ openssl enc -salt -aes-256-cbc -in inputfile.txt -kfile 2048bit_keyfile.key 

$ openssl enc -salt -aes-256-cbc -in inputfile.txt -pass file:2048bit_keyfile.key -out outputfile.txt.enc

Which method uses the full entropy of the 2048 bit keyhole?

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-k and -kfile are deprecated

The OpenSSL ENC wiki page says this:

-k password, -kfile filename
Both option are used to specify a password or a file containing the password which is used for key derivation. However they are deprecated. You should use the -pass option instead. The equivalents are -pass pass:password and -pass: file:filename respectively.

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