As we can see, the result is a binary file that looks rather scrambled. I am trying to pass this base64 encoded string to a c program to decode it using openssl in c. Click the OpenSSL interface link, as shown in the following screen shot: An OpenSSL Interface Window appears, as shown in the following screen shot: The most basic way to encrypt a file is this GitHub Gist: instantly share code, notes, and snippets. Simple text encryption/decryption with openssl. This page walks you through the basics of performing a simple encryption and corresponding decryption operation. $ 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 . Screencast of performing DES encryption using OpenSSL on Ubuntu Linux. 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. Demonstrates how to decrypt a file that was encrypted using "openssl enc". 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. It involves public key and private key, where the public key is known to all and is used to encrypt the message whereas private key is only used to decrypt the encrypted message. Example: C program to encrypt and decrypt the string using RSA algorithm. In order to perform encryption/decryption you need to know: openssl x509 -req -days 365 -in req.pem -signkey key.pem -out cert.pem. 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: The libcrypto library within OpenSSL provides functions for performing symmetric encryption and decryption operations across a wide range of algorithms and modes. These are the top rated real world PHP examples of openssl_decrypt extracted from open source projects. Commands/files user: openssl, /dev/urandom, xxd. PHP openssl_decrypt - 30 examples found. (C#) openssl enc decrypt. To encrypt files with OpenSSL is as simple as encrypting messages. This generates a 2048 bit key and associated self-signed certificate with a one year validity period. Now, when I input my seemingly good passphrase I get back: RSA is another method for encrypting and decrypting the message. I am trying to create an openssl aes encryption/decryption using php and c. 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