Openssl aes256 file encryption

Question

I would like to encrypt the file using aes256 using OpenSSL with C. I found a pretty nice example here .

Should I first read the entire file into the memory buffer, not aes256, or should I make it partial with ~ 16K buffer?

Any snippets or hints?

Answer 1

Uploading the entire file to the clipboard may not be possible for large files - do this only if all your files are below a certain limit.

OpenSSL EVP API ( ) EVP_EncryptUpdate, , . ( ). ( .)

, , ( ), OpenPGP (RFC 4880). , - , - , (PGP GnuPG) .

Answer 2

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Crypto-wise , AES - 128 (16 ). , 16 . . 4 16 , , , .