use openssl to encrypt a file through CLI

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Environment

Ubuntu 16.04 x64

OpenSSL 1.0.2g

Encrypt a file

First,Let’s see What cryptographic algorithms does OpensSL contain.

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$ openssl list-cipher-commands

Use the command above to see the password algorithm you can use.

Now,create a test file for experiment.

Here I choose aes-256-cbc to encrypt this file.

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$  openssl enc -aes-256-cbc -pass pass:test -p -in test.txt -out test.enc

  • enc – using the enc operation of OpenSSL for encryption
  • -aes-256-cbc – the cipher used
  • -pass pass:<password> – point out the password used
  • -e – encrypt
  • -p – print out the salt,key and iv
  • -in file – specify the input file absolute path
  • -out file – specify the output file absolute path
    Then,We use cat to view test.enc

    Decrypt a file

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    $ openssl enc -aes-256-cbc -pass pass:test -d -in test.enc -out decrypt_file.txt -p

  • enc – using the enc operation of OpenSSL for encryption
  • -aes-256-cbc – the cipher used
  • -pass pass:<password> – point out the password used
  • -d – decrypt
  • -p – print out the salt,key and iv
  • -in file – specify the input file absolute path
  • -out file – specify the output file absolute path
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