Match Java JCE AES CBC Encryption Results

Download: Chilkat .NET Assemblies

Shows sample code in C# that matches Java JCE encryption results for 128-bit AES encryption using CBC mode. The equivalent Java JCE code is provided as commented-out code following the C# code.

Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

// Any string argument automatically begins the 30-day trial.
bool success;
success = crypt.UnlockComponent("30-day trial");
if (success != true) {
    MessageBox.Show("Crypt component unlock failed");
    return;
}

string password;
password = "secretPassphrase";

// Use the Digest MD5 algorithm to get a 16-byte binary secret key.
crypt.HashAlgorithm = "md5";
crypt.EncodingMode = "hex";
string secretKeyHex;
secretKeyHex = crypt.HashStringENC(password);

crypt.CryptAlgorithm = "aes";
crypt.CipherMode = "cbc";
crypt.KeyLength = 128;
crypt.SetEncodedKey(secretKeyHex,"hex");
crypt.SetEncodedIV(secretKeyHex,"hex");

string text;
text = "Though this be madness, yet there is method in 't";
string encText;
encText = crypt.EncryptStringENC(text);

// Displays:
// 79c357db030ac9ae66a84528a2f387717c5f10b48ef4385e5fe7b9227b3eeb8a
// 77f24900890e72e35758b1f79f8f78d51ebe94536c30c57fd7b2c17b927715d7

textBox1.Text += encText + "\r\n";
textBox1.Refresh();

// 
// This is the equivalent code using Java JCE:
// 
// String password = "secretPassphrase";
// 
// MessageDigest md = MessageDigest.getInstance("MD5");
// md.update(password.getBytes("UTF-8"), 0, password.length());
// byte[] rawKey = md.digest();
// String text = "Though this be madness, yet there is method in 't";
// 
// SecretKeySpec skeySpec = new SecretKeySpec(rawKey, "AES");
// IvParameterSpec ivSpec = new IvParameterSpec(rawKey);
// 
// Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
// cipher.init(Cipher.ENCRYPT_MODE, skeySpec, ivSpec);
// 
// byte[] encrypted = cipher.doFinal(text.getBytes("UTF-8"));
// 
// System.out.println(toHex(encrypted));

// This is the toHex method in Java:
// public static String toHex (byte buf[]) {
// 
// StringBuffer strbuf = new StringBuffer(buf.length * 2);
// int i;
// 
// for (i = 0; i < buf.length; i++) {
// if (((int) buf[i] & 0xff) < 0x10)
// strbuf.append("0");
// 
// strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
// }
// 
// return strbuf.toString();
// }