How do you encrypt a file in OpenSSL?
To encrypt files with OpenSSL is as simple as encrypting messages. The only difference is that instead of the echo command we use the -in option with the actual file we would like to encrypt and -out option, which will instruct OpenSSL to store the encrypted file under a given name:
How to decrypt the openssl.dat file back to its original message?
To decrypt the openssl.dat file back to its original message use: To encrypt files with OpenSSL is as simple as encrypting messages. The only difference is that instead of the echo command we use the -in option with the actual file we would like to encrypt and -out option, which will instruct OpenSSL to store the encrypted file under a given name:
How to store OpenSSL output in a file?
Subscribe to our NEWSLETTER and receive latest Linux news, jobs, career advice and tutorials. If you wish to store OpenSSL’s output to a file instead of STDOUT simply use STDOUT redirection “>”. When storing encrypted output to a file you can also omit -a option as you no longer need the output to be ASCII text based:
Which is the correct way to use PHP OpenSSL?
If possible I would use an authenticated encryption mode like GCM if you can (looks like it’s supported in PHP 7.1+ (Example #1) ). If you use CBC mode take a look at Example #2 in the docs. Note that after encrypting a MAC (message authentication code) is computed over the ciphertext and stored.
What kind of operations can you do with OpenSSL?
OpenSSL is a program and library that supports many different cryptographic operations, including: Each of the operations supported by OpenSSL have a variety of options, such as input/output files, algorithms, algorithm parameters and formats. This article aims to give a demonstration of some simple and common operations.
How to generate a self signed certificate in OpenSSL?
If you intend to use this certificate in Apache or Nginx, then you need to send this CSR file to certificate issuer authority, and they will give you a signed certificate mostly in der or pem format which you need to configure in Apache or Nginx web server. The above command will generate a self-signed certificate and key file with 2048-bit RSA.