(JavaScript) openssl enc decrypt
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
Note: This example requires Chilkat v11.1.0 or greater.
var success = false;
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
var crypt = new CkCrypt2();
// 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.
var fileData = new CkBinData();
success = fileData.LoadFile("qa_data/openssl_enc/hamlet.enc");
// Decrypt
crypt.VerboseLogging = true;
success = crypt.DecryptBd(fileData);
console.log(crypt.LastErrorText);
// Save the decrypted output.
success = fileData.WriteFile("c:/temp/qa_output/hamlet_dec.xml");
console.log("success = " + success);
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