How to decrypt AES encrypted data with openssl command?

Question

I want to decrypt AES encrypted data with openssl command.

• Encrypted data: GD5YV2naJZ/x3mQnfictWQ== (base64 encoded)
• Key: uHe2MCmggLlugpGBiMVuXTck7OT8Nk8g
• Cipher: AES-256-CBC
• IV: LNP8U7pc6GjxzxAtgw4s3A== (base64 encoded)

Answer 1

Follow these steps:

$ echo GD5YV2naJZ/x3mQnfictWQ== | openssl base64 -d > data.enc
$ iv=$( echo LNP8U7pc6GjxzxAtgw4s3A== | openssl base64 -d | xxd -p | tr -d '\n' )
$ echo $iv
2cd3fc53ba5ce868f1cf102d830e2cdc
$ key=$( echo uHe2MCmggLlugpGBiMVuXTck7OT8Nk8g | xxd -p | tr -d '\n' )
$ echo $key
754865324d436d67674c6c7567704742694d56755854636b374f54384e6b38670a
$ openssl aes-256-cbc -d -in data.enc -K $key -iv $iv
s:4:"Test";

With -base64 option, the decrypt command can directly use base64 encoded data as the input:

$ echo GD5YV2naJZ/x3mQnfictWQ== | openssl aes-256-cbc -d -base64 -K $key -iv $iv
s:4:"Test";