Delphi ActiveX 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

Delphi ActiveX

var
success: Integer;
crypt: TChilkatCrypt2;
fileData: TChilkatBinData;

begin
success := 0;

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

crypt := TChilkatCrypt2.Create(Self);

//  Use aes-256-cbc
crypt.CryptAlgorithm := 'aes';
crypt.CipherMode := 'cbc';
crypt.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.HashAlgorithm := 'sha256';

//  This example assumes openssl 1.0.2 was used to encrypt what we're now decrypting:
crypt.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 := TChilkatBinData.Create(Self);
success := fileData.LoadFile('qa_data/openssl_enc/hamlet.enc');

//  Decrypt
crypt.VerboseLogging := 1;
success := crypt.DecryptBd(fileData.ControlInterface);
Memo1.Lines.Add(crypt.LastErrorText);

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

Memo1.Lines.Add('success = ' + IntToStr(Ord(success)));