Rust

AES 256-bit CBC using PBKDF2 Generated Secret Key

See more Encryption Examples

First generates a 32-byte secret key using PBKDF2 (with HMAC-SHA256), and then uses the secret key to do 256-bit AES CBC mode decryption.

(Duplicates the following Java code)

public String decrypt(String strToDecrypt) {
        try  {
            // Read the initialization vector from the first bytes for the data
            byte [] rawData = Base64.getDecoder().decode(strToDecrypt);
            byte [] iv = new byte[Config.get().encryptionIVLength()];
            byte [] encryptedData = new byte[rawData.length - iv.length];
            System.arraycopy(rawData, 0, iv, 0, iv.length);
            System.arraycopy(rawData, iv.length, encryptedData, 0, encryptedData.length);
 
            IvParameterSpec ivspec = new IvParameterSpec(iv);
 
            SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
            KeySpec spec = new PBEKeySpec(secretKey.toCharArray(), salt.getBytes(), 65536, 256);
            SecretKey tmp = factory.generateSecret(spec);
            SecretKeySpec secretKey = new SecretKeySpec(tmp.getEncoded(), "AES");
 
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.DECRYPT_MODE, secretKey, ivspec);
            return new String(cipher.doFinal(encryptedData));
        }
        catch (Exception e) {
            log.error("Could not decrypt the string.", e);
        }
        return null;
    }

Rust

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

let crypt = chilkat::Crypt2::new();

let password = "some arbitrary length password".to_string();
// We have 8 bytes of salt encoded using hex.
// (The salt can be any number of bytes, in any desired encoding such as base64, hex, etc.)
let salt_hex = "0102030405060708".to_string();

// Generate the 256-bit (32-byte) AES secret key we'll use to decrypt.
let iteration_count = 65536;
let output_key_bit_len = 256;
let secret_key_hex = crypt.pbkdf2(&password, "utf-8", "sha256", &salt_hex, iteration_count, output_key_bit_len, "hex").unwrap_or_default();

// Setup for 256-bit AES CBC decryption.
crypt.set_crypt_algorithm("aes");
crypt.set_key_length(256);
crypt.set_cipher_mode("cbc");
crypt.set_padding_scheme(0);

// The IV for AES is 16 bytes.
let iv = "000102030405060708090A0B0C0D0E0F".to_string();
crypt.set_encoded_iv(&iv, "hex");

// Set the secret key for 256-bit AES.
crypt.set_encoded_key(&secret_key_hex, "hex");

// AES decrypt
// assume our string to decrypt is base64
let str_to_decrypt = "....".to_string();
crypt.set_encoding_mode("base64");
let decrypted_str = crypt.decrypt_string_enc(&str_to_decrypt).unwrap_or_default();

println!("{}", decrypted_str);