kjunichi/20240906.md

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20240906.md

暗号関連

カウンターモード

パディングが不要

AES-256-GCMのIVの長さ

12バイトらしい。カウンターの４バイトは含めない模様。

irb(main):001:0> require 'openssl'
=> true
irb(main):002:0> cipher = OpenSSL::Cipher.new("AES-256-GCM")
=> #<OpenSSL::Cipher:0x00007fddb10d4198>
irb(main):003:0> cipher.iv_len
=> 12
irb(main):004:0>