Match Java JCE AES CBC Encryption Results

Shows sample code in Ruby 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 Ruby code.

Downloads for Windows/Linux and Install Instructions

require 'rubygems'
require 'chilkat'

crypt = Chilkat::CkCrypt2.new()

# Any string argument automatically begins the 30-day trial.
success = crypt.UnlockComponent("30-day trial")
if (success != true)
    print "Crypt component unlock failed" + "\n"
    exit
end

password = "secretPassphrase"

# Use the Digest MD5 algorithm to get a 16-byte binary secret key.
crypt.put_HashAlgorithm("md5")
crypt.put_EncodingMode("hex")
secretKeyHex = crypt.hashStringENC(password)

crypt.put_CryptAlgorithm("aes")
crypt.put_CipherMode("cbc")
crypt.put_KeyLength(128)
crypt.SetEncodedKey(secretKeyHex,"hex")
crypt.SetEncodedIV(secretKeyHex,"hex")

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

# Displays:
# 79c357db030ac9ae66a84528a2f387717c5f10b48ef4385e5fe7b9227b3eeb8a
# 77f24900890e72e35758b1f79f8f78d51ebe94536c30c57fd7b2c17b927715d7

print encText + "\n";

# 
# 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();
# }