The most basic way to encrypt a file is this $ openssl enc -base64 -in text.plain -out text.base64 To decode a file the the decrypt option (-d) has to be used $ openssl enc -d -base64 -in text.base64 -out text.plain Encryption Basic Usage . RSA is another method for encrypting and decrypting the message. To create a self-signed certificate with just one command use the command below. Simple text encryption/decryption with openssl. I am trying to pass this base64 encoded string to a c program to decode it using openssl in c. openssl x509 -req -days 365 -in req.pem -signkey key.pem -out cert.pem. Demonstrates how to decrypt a file that was encrypted using "openssl enc". This example shows how to decrypt what was created using this openssl command: openssl enc -e -aes-256-cbc -in hamlet.xml -out hamlet.enc -pass file:./secret.txt This example shows how to do this: openssl req -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -days 365 As we can see, the result is a binary file that looks rather scrambled. This generates a 2048 bit key and associated self-signed certificate with a one year validity period. These are the top rated real world PHP examples of openssl_decrypt extracted from open source projects. (C#) openssl enc decrypt. This page walks you through the basics of performing a simple encryption and corresponding decryption operation. Example: C program to encrypt and decrypt the string using RSA algorithm. To encrypt files with OpenSSL is as simple as encrypting messages. You can rate examples to help us improve the quality of examples. Click the OpenSSL interface link, as shown in the following screen shot: An OpenSSL Interface Window appears, as shown in the following screen shot: GitHub Gist: instantly share code, notes, and snippets. Commands/files user: openssl, /dev/urandom, xxd. To decrypt the openssl.dat file back to its original message use: $ openssl enc -aes-256-cbc -d -in openssl.dat enter aes-256-cbc decryption password: OpenSSL Encrypt and Decrypt File. The libcrypto library within OpenSSL provides functions for performing symmetric encryption and decryption operations across a wide range of algorithms and modes. In order to perform encryption/decryption you need to know: Enter pass phrase for ./id_rsa: unable to load Private Key 140256774473360:error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt:evp_enc.c:544: 140256774473360:error:0906A065:PEM routines:PEM_do_header:bad decrypt:pem_lib.c:483 "bad decrypt" is pretty clear. PHP openssl_decrypt - 30 examples found. 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