Delphi DLL 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 DLL

var
success: Boolean;
crypt: HCkCrypt2;
fileData: HCkBinData;

begin
success := False;

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

crypt := CkCrypt2_Create();

//  Use aes-256-cbc
CkCrypt2_putCryptAlgorithm(crypt,'aes');
CkCrypt2_putCipherMode(crypt,'cbc');
CkCrypt2_putKeyLength(crypt,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:
CkCrypt2_putHashAlgorithm(crypt,'sha256');

//  This example assumes openssl 1.0.2 was used to encrypt what we're now decrypting:
CkCrypt2_putHashAlgorithm(crypt,'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:
CkCrypt2_SetEncodedKey(crypt,'secret','openssl');

//  Load the file to be decrypted.
fileData := CkBinData_Create();
success := CkBinData_LoadFile(fileData,'qa_data/openssl_enc/hamlet.enc');

//  Decrypt
CkCrypt2_putVerboseLogging(crypt,True);
success := CkCrypt2_DecryptBd(crypt,fileData);
Memo1.Lines.Add(CkCrypt2__lastErrorText(crypt));

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

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

CkCrypt2_Dispose(crypt);
CkBinData_Dispose(fileData);