Ruby Requires Chilkat v11.1.0+

openssl enc decrypt

See more Encryption Examples

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 enc -d -aes-256-cbc -in hamlet.enc -out hamlet_dec.xml -pass file:./secret.txt

Ruby

require 'chilkat'

success = false

#  This example requires the Chilkat API to have been previously unlocked.
#  See Global Unlock Sample for sample code.

crypt = Chilkat::CkCrypt2.new()

#  Use aes-256-cbc
crypt.put_CryptAlgorithm("aes")
crypt.put_CipherMode("cbc")
crypt.put_KeyLength(256)

#  We'll need to set the hash algorithm to either MD5 or SHA256.
#  openssl version 1.0.* or earlier used MD5 by default
#  openssl version 1.1.* uses SHA-256 for the password to secret key derivation.

#  For example, if openssl 1.1.0 was used, we should do this:
crypt.put_HashAlgorithm("sha256")

#  This example assumes openssl 1.0.2 was used to encrypt what we're now decrypting:
crypt.put_HashAlgorithm("md5")

#  The openssl command we are duplicating is:
#  
#     openssl enc -d -aes-256-cbc -in hamlet.enc -out hamlet_dec.xml -pass file:./secret.txt
#  
#  The file secret.txt contains the word "secret".  We could write code to load the contents
#  of secret.txt, but instead we'll just do this:
crypt.SetEncodedKey("secret","openssl")

#  Load the file to be decrypted.
fileData = Chilkat::CkBinData.new()
success = fileData.LoadFile("qa_data/openssl_enc/hamlet.enc")

#  Decrypt
crypt.put_VerboseLogging(true)
success = crypt.DecryptBd(fileData)
print crypt.lastErrorText() + "\n";

#  Save the decrypted output.
success = fileData.WriteFile("c:/temp/qa_output/hamlet_dec.xml")

print "success = " + success.to_s() + "\n";