I need to decrypt in JAVA a file encrypted in UNIX with the following command:
openssl aes-256-cbc -a -salt -in password.txt -out password.txt.enc
mypass
mypass
I have to decrypt in java as I do here I do in UNIX
openssl aes-256-cbc -d -a -in password.txt.enc -out password.txt.new
mypass
Someone can give me a java code to do this?
OpenSSL generally uses its own password based key derivation method, specified in EVP_BytesToKey, please see the code below. Furthermore, it implicitly encodes the ciphertext as base 64 over multiple lines, which would be required to send it within the body of a mail message.
So the result is, in pseudocode:
salt = random(8)
keyAndIV = BytesToKey(password, salt, 48)
key = keyAndIV[0..31]
iv = keyAndIV[32..47]
ct = AES-256-CBC-encrypt(key, iv, plaintext)
res = base64MimeEncode("Salted__" | salt | ct))
and the decryption therefore is:
(salt, ct) = base64MimeDecode(res)
key = keyAndIV[0..31]
iv = keyAndIV[32..47]
pt = AES-256-CBC-decrypt(key, iv, plaintext)
which can be implemented in Java like this:
import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.util.Arrays;
import java.util.List;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.util.encoders.Base64;
public class OpenSSLDecryptor {
private static final Charset ASCII = Charset.forName("ASCII");
private static final int INDEX_KEY = 0;
private static final int INDEX_IV = 1;
private static final int ITERATIONS = 1;
private static final int ARG_INDEX_FILENAME = 0;
private static final int ARG_INDEX_PASSWORD = 1;
private static final int SALT_OFFSET = 8;
private static final int SALT_SIZE = 8;
private static final int CIPHERTEXT_OFFSET = SALT_OFFSET + SALT_SIZE;
private static final int KEY_SIZE_BITS = 256;
/**
* Thanks go to Ola Bini for releasing this source on his blog.
* The source was obtained from here .
*/
public static byte[][] EVP_BytesToKey(int key_len, int iv_len, MessageDigest md,
byte[] salt, byte[] data, int count) {
byte[][] both = new byte[2][];
byte[] key = new byte[key_len];
int key_ix = 0;
byte[] iv = new byte[iv_len];
int iv_ix = 0;
both[0] = key;
both[1] = iv;
byte[] md_buf = null;
int nkey = key_len;
int niv = iv_len;
int i = 0;
if (data == null) {
return both;
}
int addmd = 0;
for (;;) {
md.reset();
if (addmd++ > 0) {
md.update(md_buf);
}
md.update(data);
if (null != salt) {
md.update(salt, 0, 8);
}
md_buf = md.digest();
for (i = 1; i < count; i++) {
md.reset();
md.update(md_buf);
md_buf = md.digest();
}
i = 0;
if (nkey > 0) {
for (;;) {
if (nkey == 0)
break;
if (i == md_buf.length)
break;
key[key_ix++] = md_buf[i];
nkey--;
i++;
}
}
if (niv > 0 && i != md_buf.length) {
for (;;) {
if (niv == 0)
break;
if (i == md_buf.length)
break;
iv[iv_ix++] = md_buf[i];
niv--;
i++;
}
}
if (nkey == 0 && niv == 0) {
break;
}
}
for (i = 0; i < md_buf.length; i++) {
md_buf[i] = 0;
}
return both;
}
public static void main(String[] args) {
try {
// --- read base 64 encoded file ---
File f = new File(args[ARG_INDEX_FILENAME]);
List<String> lines = Files.readAllLines(f.toPath(), ASCII);
StringBuilder sb = new StringBuilder();
for (String line : lines) {
sb.append(line.trim());
}
String dataBase64 = sb.toString();
byte[] headerSaltAndCipherText = Base64.decode(dataBase64);
// --- extract salt & encrypted ---
// header is "Salted__", ASCII encoded, if salt is being used (the default)
byte[] salt = Arrays.copyOfRange(
headerSaltAndCipherText, SALT_OFFSET, SALT_OFFSET + SALT_SIZE);
byte[] encrypted = Arrays.copyOfRange(
headerSaltAndCipherText, CIPHERTEXT_OFFSET, headerSaltAndCipherText.length);
// --- specify cipher and digest for EVP_BytesToKey method ---
Cipher aesCBC = Cipher.getInstance("AES/CBC/PKCS5Padding");
MessageDigest md5 = MessageDigest.getInstance("MD5");
// --- create key and IV ---
// the IV is useless, OpenSSL might as well have use zero's
final byte[][] keyAndIV = EVP_BytesToKey(
KEY_SIZE_BITS / Byte.SIZE,
aesCBC.getBlockSize(),
md5,
salt,
args[ARG_INDEX_PASSWORD].getBytes(ASCII),
ITERATIONS);
SecretKeySpec key = new SecretKeySpec(keyAndIV[INDEX_KEY], "AES");
IvParameterSpec iv = new IvParameterSpec(keyAndIV[INDEX_IV]);
// --- initialize cipher instance and decrypt ---
aesCBC.init(Cipher.DECRYPT_MODE, key, iv);
byte[] decrypted = aesCBC.doFinal(encrypted);
String answer = new String(decrypted, ASCII);
System.out.println(answer);
} catch (BadPaddingException e) {
// AKA "something went wrong"
throw new IllegalStateException(
"Bad password, algorithm, mode or padding;" +
" no salt, wrong number of iterations or corrupted ciphertext.");
} catch (IllegalBlockSizeException e) {
throw new IllegalStateException(
"Bad algorithm, mode or corrupted (resized) ciphertext.");
} catch (GeneralSecurityException e) {
throw new IllegalStateException(e);
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
}
Beware that the code specifies ASCII as character set. The character set used may differ for your application / terminal / OS.
In general you should force OpenSSL to use the NIST approved PBKDF2 algorithm, as using the OpenSSL key derivation method - with an iteration count of 1 - is insecure. This may force you to use a different solution than OpenSSL. Note that password based encryption is inherently rather insecure - passwords are much less secure than randomly generated symmetric keys.
OpenSSL 1.1.0c changed the digest algorithm used in some internal components. Formerly, MD5 was used, and 1.1.0 switched to SHA256. Be careful the change is not affecting you in both EVP_BytesToKey and commands like openssl enc.
It's probably best to explicitly specify the digest in the command line interface (e.g. -md md5 for backwards compatibility or sha-256 for forwards compatibility) for the and make sure that the Java code uses the same digest algorithm ("MD5" or "SHA-256" including the dash). Also see the information in this answer.
Below are OpenSSLPBEInputStream and OpenSSLPBEOutputStream which can be used to encrypt/decrypt arbitrary streams of bytes in a way that is compatible with OpenSSL.
Example usage:
// The original clear text bytes
byte[] originalBytes = ...
// Encrypt these bytes
char[] pwd = "thePassword".toCharArray();
ByteArrayOutputStream byteOS = new ByteArrayOutputStream();
OpenSSLPBEOutputStream encOS = new OpenSSLPBEOutputStream(byteOS, ALGORITHM, 1, pwd);
encOS.write(originalBytes);
encOS.flush();
byte[] encryptedBytes = byteOS.toByteArray();
// Decrypt the bytes
ByteArrayInputStream byteIS = new ByteArrayInputStream(encryptedBytes);
OpenSSLPBEInputStream encIS = new OpenSSLPBEInputStream(byteIS, ALGORITHM, 1, pwd);
Where ALGORITHM (using just JDK classes) can be: "PBEWithMD5AndDES", "PBEWithMD5AndTripleDES", "PBEWithSHA1AndDESede", "PBEWithSHA1AndRC2_40".
To handle "openssl aes-256-cbc -a -salt -in password.txt -out password.txt.enc" of the original poster, add bouncey castle to the classpath, and use algorthm= "PBEWITHMD5AND256BITAES-CBC-OPENSSL".
/* Add BC provider, and fail fast if BC provider is not in classpath for some reason */
Security.addProvider(new BouncyCastleProvider());
The dependency:
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk16</artifactId>
<version>1.44</version>
</dependency>
The input stream:
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.io.IOException;
import java.io.InputStream;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
public class OpenSSLPBEInputStream extends InputStream {
private final static int READ_BLOCK_SIZE = 64 * 1024;
private final Cipher cipher;
private final InputStream inStream;
private final byte[] bufferCipher = new byte[READ_BLOCK_SIZE];
private byte[] bufferClear = null;
private int index = Integer.MAX_VALUE;
private int maxIndex = 0;
public OpenSSLPBEInputStream(final InputStream streamIn, String algIn, int iterationCount, char[] password)
throws IOException {
this.inStream = streamIn;
try {
byte[] salt = readSalt();
cipher = OpenSSLPBECommon.initializeCipher(password, salt, Cipher.DECRYPT_MODE, algIn, iterationCount);
} catch (InvalidKeySpecException | NoSuchPaddingException | NoSuchAlgorithmException | InvalidKeyException | InvalidAlgorithmParameterException e) {
throw new IOException(e);
}
}
#Override
public int available() throws IOException {
return inStream.available();
}
#Override
public int read() throws IOException {
if (index > maxIndex) {
index = 0;
int read = inStream.read(bufferCipher);
if (read != -1) {
bufferClear = cipher.update(bufferCipher, 0, read);
}
if (read == -1 || bufferClear == null || bufferClear.length == 0) {
try {
bufferClear = cipher.doFinal();
} catch (IllegalBlockSizeException | BadPaddingException e) {
bufferClear = null;
}
}
if (bufferClear == null || bufferClear.length == 0) {
return -1;
}
maxIndex = bufferClear.length - 1;
}
return bufferClear[index++] & 0xff;
}
private byte[] readSalt() throws IOException {
byte[] headerBytes = new byte[OpenSSLPBECommon.OPENSSL_HEADER_STRING.length()];
inStream.read(headerBytes);
String headerString = new String(headerBytes, OpenSSLPBECommon.OPENSSL_HEADER_ENCODE);
if (!OpenSSLPBECommon.OPENSSL_HEADER_STRING.equals(headerString)) {
throw new IOException("unexpected file header " + headerString);
}
byte[] salt = new byte[OpenSSLPBECommon.SALT_SIZE_BYTES];
inStream.read(salt);
return salt;
}
}
The output stream:
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.io.IOException;
import java.io.OutputStream;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
public class OpenSSLPBEOutputStream extends OutputStream {
private static final int BUFFER_SIZE = 5 * 1024 * 1024;
private final Cipher cipher;
private final OutputStream outStream;
private final byte[] buffer = new byte[BUFFER_SIZE];
private int bufferIndex = 0;
public OpenSSLPBEOutputStream(final OutputStream outputStream, String algIn, int iterationCount,
char[] password) throws IOException {
outStream = outputStream;
try {
/* Create and use a random SALT for each instance of this output stream. */
byte[] salt = new byte[PBECommon.SALT_SIZE_BYTES];
new SecureRandom().nextBytes(salt);
cipher = OpenSSLPBECommon.initializeCipher(password, salt, Cipher.ENCRYPT_MODE, algIn, iterationCount);
/* Write header */
writeHeader(salt);
} catch (InvalidKeySpecException | NoSuchPaddingException | NoSuchAlgorithmException | InvalidKeyException | InvalidAlgorithmParameterException e) {
throw new IOException(e);
}
}
#Override
public void write(int b) throws IOException {
buffer[bufferIndex] = (byte) b;
bufferIndex++;
if (bufferIndex == BUFFER_SIZE) {
byte[] result = cipher.update(buffer, 0, bufferIndex);
outStream.write(result);
bufferIndex = 0;
}
}
#Override
public void flush() throws IOException {
if (bufferIndex > 0) {
byte[] result;
try {
result = cipher.doFinal(buffer, 0, bufferIndex);
outStream.write(result);
} catch (IllegalBlockSizeException | BadPaddingException e) {
throw new IOException(e);
}
bufferIndex = 0;
}
}
#Override
public void close() throws IOException {
flush();
outStream.close();
}
private void writeHeader(byte[] salt) throws IOException {
outStream.write(OpenSSLPBECommon.OPENSSL_HEADER_STRING.getBytes(OpenSSLPBECommon.OPENSSL_HEADER_ENCODE));
outStream.write(salt);
}
}
Small common class:
import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
class OpenSSLPBECommon {
protected static final int SALT_SIZE_BYTES = 8;
protected static final String OPENSSL_HEADER_STRING = "Salted__";
protected static final String OPENSSL_HEADER_ENCODE = "ASCII";
protected static Cipher initializeCipher(char[] password, byte[] salt, int cipherMode,
final String algorithm, int iterationCount) throws NoSuchAlgorithmException, InvalidKeySpecException,
InvalidKeyException, NoSuchPaddingException, InvalidAlgorithmParameterException {
PBEKeySpec keySpec = new PBEKeySpec(password);
SecretKeyFactory factory = SecretKeyFactory.getInstance(algorithm);
SecretKey key = factory.generateSecret(keySpec);
Cipher cipher = Cipher.getInstance(algorithm);
cipher.init(cipherMode, key, new PBEParameterSpec(salt, iterationCount));
return cipher;
}
}
In Kotlin:
package io.matthewnelson.java_crypto
import java.util.*
import javax.crypto.Cipher
import javax.crypto.SecretKeyFactory
import javax.crypto.spec.IvParameterSpec
import javax.crypto.spec.PBEKeySpec
import javax.crypto.spec.SecretKeySpec
class OpenSSL {
/**
* Will decrypt a string value encrypted by OpenSSL v 1.1.1+ using the following cmds from terminal:
*
* echo "Hello World!" | openssl aes-256-cbc -e -a -p -salt -pbkdf2 -iter 15739 -k qk4aX-EfMUa-g4HdF-fjfkU-bbLNx-15739
*
* Terminal output:
* salt=CC73B7D29FE59CE1
* key=31706F84185EA4B5E8E040F2C813F79722F22996B48B82FF98174F887A9B9993
* iv =1420310D41FD7F48E5D8722B9AC1C8DD
* U2FsdGVkX1/Mc7fSn+Wc4XLwDsmLdR8O7K3bFPpCglA=
* */
fun decrypt_AES256CBC_PBKDF2_HMAC_SHA256(
password: String,
hashIterations: Int,
encryptedString: String
): String {
val encryptedBytes = Base64.getDecoder().decode(encryptedString)
// Salt is bytes 8 - 15
val salt = encryptedBytes.copyOfRange(8, 16)
// println("Salt: ${salt.joinToString("") { "%02X".format(it) }}")
// Derive 48 byte key
val keySpec = PBEKeySpec(password.toCharArray(), salt, hashIterations, 48 * 8)
val keyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256")
val secretKey = keyFactory.generateSecret(keySpec)
// Decryption Key is bytes 0 - 31 of the derived key
val key = secretKey.encoded.copyOfRange(0, 32)
// println("Key: ${key.joinToString("") { "%02X".format(it) }}")
// Input Vector is bytes 32 - 47 of the derived key
val iv = secretKey.encoded.copyOfRange(32, 48)
// println("IV: ${iv.joinToString("") { "%02X".format(it) }}")
// Cipher Text is bytes 16 - end of the encrypted bytes
val cipherText = encryptedBytes.copyOfRange(16, encryptedBytes.lastIndex + 1)
// Decrypt the Cipher Text and manually remove padding after
val cipher = Cipher.getInstance("AES/CBC/NoPadding")
cipher.init(Cipher.DECRYPT_MODE, SecretKeySpec(key, "AES"), IvParameterSpec(iv))
val decrypted = cipher.doFinal(cipherText)
// println("Decrypted: ${decrypted.joinToString("") { "%02X".format(it) }}")
// Last byte of the decrypted text is the number of padding bytes needed to remove
val plaintext = decrypted.copyOfRange(0, decrypted.lastIndex + 1 - decrypted.last().toInt())
return plaintext.toString(Charsets.UTF_8)
}
}
Don't use ase-128-cbc, use ase-128-ecb.
only take first 16 bytes as key because key is 128 bits
hash output is printed in hex, which every 2 chars presents a byte value
hashpwd=echo -n $password| openssl sha1 | sed 's#.*=\\s*##g' | cut -c 1-32
openssl enc -aes-128-ecb -salt -in -out -K $hashpwd
Java Code is here:
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.io.*;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Arrays;
//openssl enc -nosalt -aes-128-ecb
// -in <input file>
// -out <output file>
// -K <16 bytes in hex, for example : "abc" can be hashed in SHA-1, the first 16 bytes in hex is a9993e364706816aba3e25717850c26c>
private final static String TRANSFORMATION = "AES"; // use aes-128-ecb in openssl
public static byte[] encrypt(String passcode, byte[] data) throws CryptographicException {
try {
Cipher cipher = Cipher.getInstance(TRANSFORMATION);
cipher.init(Cipher.ENCRYPT_MODE, genKeySpec(passcode));
return cipher.doFinal(data);
} catch (Exception ex) {
throw new CryptographicException("Error encrypting", ex);
}
}
public static String encryptWithBase64(String passcode, byte[] data) throws CryptographicException {
return new BASE64Encoder().encode(encrypt(passcode, data));
}
public static byte[] decrypt(String passcode, byte[] data) throws CryptographicException {
try {
Cipher dcipher = Cipher.getInstance(TRANSFORMATION);
dcipher.init(Cipher.DECRYPT_MODE, genKeySpec(passcode));
return dcipher.doFinal(data);
} catch (Exception e) {
throw new CryptographicException("Error decrypting", e);
}
}
public static byte[] decryptWithBase64(String passcode, String encrptedStr) throws CryptographicException {
try {
return decrypt(passcode, new BASE64Decoder().decodeBuffer(encrptedStr));
} catch (Exception e) {
throw new CryptographicException("Error decrypting", e);
}
}
public static SecretKeySpec genKeySpec(String passcode) throws UnsupportedEncodingException, NoSuchAlgorithmException {
byte[] key = passcode.getBytes("UTF-8");
MessageDigest sha = MessageDigest.getInstance("SHA-1");
key = sha.digest(key);
key = Arrays.copyOf(key, 16); // use only first 128 bit
return new SecretKeySpec(key, TRANSFORMATION);
}
Tested and passed in jdk6 and jdk8.
Related
I want to exactly build a function which produces a HMAC with a secret key like this site provides:
http://www.freeformatter.com/hmac-generator.html
The Java 8 lib only provides MessageDigest and KeyGenerator which both only support up to SH256.
Also, Google doesn't give me any result for an implementation to generate a HMAC.
Does someone know a implementation?
I have this code to generate an ordinary SH256 but I guess this doesn't help me much:
public static String get_SHA_512_SecurePassword(String passwordToHash) throws Exception {
String generatedPassword = null;
MessageDigest md = MessageDigest.getInstance("SHA-512");
byte[] bytes = md.digest(passwordToHash.getBytes("UTF-8"));
StringBuilder sb = new StringBuilder();
for (int i = 0; i < bytes.length; i++) {
sb.append(Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1));
}
generatedPassword = sb.toString();
System.out.println(generatedPassword);
return generatedPassword;
}
The simplest way can be -
private static final String HMAC_SHA512 = "HmacSHA512";
private static String toHexString(byte[] bytes) {
Formatter formatter = new Formatter();
for (byte b : bytes) {
formatter.format("%02x", b);
}
return formatter.toString();
}
public static String calculateHMAC(String data, String key)
throws SignatureException, NoSuchAlgorithmException, InvalidKeyException
{
SecretKeySpec secretKeySpec = new SecretKeySpec(key.getBytes(), HMAC_SHA512);
Mac mac = Mac.getInstance(HMAC_SHA512);
mac.init(secretKeySpec);
return toHexString(mac.doFinal(data.getBytes()));
}
public static void main(String[] args) throws Exception {
String hmac = calculateHMAC("data", "key");
System.out.println(hmac);
}
You can change the HMAC_SHA512 variable to any of the Mac algorithm and the code will work the same way.
Hope this helps:
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;
public class Test1 {
private static final String HMAC_SHA512 = "HmacSHA512";
public static void main(String[] args) {
Mac sha512Hmac;
String result;
final String key = "Welcome1";
try {
final byte[] byteKey = key.getBytes(StandardCharsets.UTF_8);
sha512Hmac = Mac.getInstance(HMAC_SHA512);
SecretKeySpec keySpec = new SecretKeySpec(byteKey, HMAC_SHA512);
sha512Hmac.init(keySpec);
byte[] macData = sha512Hmac.doFinal("My message".getBytes(StandardCharsets.UTF_8));
// Can either base64 encode or put it right into hex
result = Base64.getEncoder().encodeToString(macData);
//result = bytesToHex(macData);
} catch (UnsupportedEncodingException | InvalidKeyException | NoSuchAlgorithmException e) {
e.printStackTrace();
} finally {
// Put any cleanup here
System.out.println("Done");
}
}
}
For converting from byte array to hex refer this stackoverflow answer : here
Also you can use a little wrapper by Apache Commons codec:
import static org.apache.commons.codec.digest.HmacAlgorithms.HMAC_SHA_512;
import org.apache.commons.codec.digest.HmacUtils;
public class HmacService {
private String sharedSecret;
public HmacService(String sharedSecret) {
this.sharedSecret = sharedSecret;
}
public String calculateHmac(String data) {
return new HmacUtils(HMAC_SHA_512, sharedSecret).hmacHex(data);
}
public boolean checkHmac(String data, String hmacHex) {
return calculateHmac(data).equals(hmacHex);
}
}
You could use Caesar (version 0.6.0 or later):
int blockSize = 128;
String secretKey = "My secret key";
String message = "Message to hash";
System.out.println(
new Hmac(
new ImmutableMessageDigest(
MessageDigest.getInstance("SHA-512")
),
blockSize,
new PlainText(secretKey),
new PlainText(message)
).asHexString()
);
I am connecting a third party interface and they only gave me a Java code demo, I need to connect it with my PHP system.But I can't handle the encryption, my encryption proccess in PHP always gets different result with the third party Java code.
I install phpseclib/phpseclib package via composer in order to perform AES encryption.
Java Encryption Code:
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
private static final String KEY_ALGORITHM = "AES";
private static final String DEFAULT_CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";
public static String encrypt(String content, String encryptKey) {
try {
Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);
byte[] byteContent = content.getBytes("utf-8");
cipher.init(Cipher.ENCRYPT_MODE, getSecretKey(encryptKey));
byte[] result = cipher.doFinal(byteContent);
return toHexString(result);
} catch (Exception ex) {
}
return null;
}
private static SecretKeySpec getSecretKey(final String encryptKey) {
KeyGenerator kg = null;
try {
kg = KeyGenerator.getInstance(KEY_ALGORITHM);
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
secureRandom.setSeed(encryptKey.getBytes());
kg.init(128, secureRandom);
SecretKey secretKey = kg.generateKey();
return new SecretKeySpec(secretKey.getEncoded(), KEY_ALGORITHM);
} catch (NoSuchAlgorithmException ex) {
}
return null;
}
public static String toHexString(byte b[]) {
StringBuffer hexString = new StringBuffer();
for (int i = 0; i < b.length; i++) {
String plainText = Integer.toHexString(0xff & b[i]);
if (plainText.length() < 2)
plainText = "0" + plainText;
hexString.append(plainText);
}
return hexString.toString();
}
PHP encryption code:
//composer require phpseclib/phpseclib
use phpseclib\Crypt\AES;
function aesEncrypt($message, $key)
{
$cipher = new AES(AES::MODE_ECB);
$cipher->setKeyLength(128);
$cipher->setKey(hex2bin($key));
$cryptText = $cipher->encrypt($message);
return bin2hex($cryptText);
}
Java Result:
before:testStringtestString
key:acccd6fa0caf52a0e5e5fda8bd3ff55a
after:2bbd3011eb084c9494228fe913e6e033aaffb1aa04ef9d0f14614c21fd16af9a
PHP Result:
before:testStringtestString
key:acccd6fa0caf52a0e5e5fda8bd3ff55a
after:d9a683511cdeb174bf51a285140071a8b38b57c6c6133d1b9425846ae0ec333b
Error : javax.crypto.IllegalBlockSizeException: Input length must be
multiple of 16 when decrypting with padded cipher
Tried Solutions: I've tried to to change the padding to "AES/ECB/NoPadding", "AES/ECB/PKCS5", "AES/CBC/NoPadding", "AES/CBC/PKCS5Padding" and still received the same error or an error stating only AES or Rijndael required. Then I tried making the key use "AES" parameter and ALGO set to "AES/CBC/PKCS5Padding", but I recieved a missing parameter error which I tried to fix my adding new IvParameterSpec(new byte[16]) to cipher.init. It still resulted into the 16 bit issue. So I'm stuck now.
import java.util.Scanner;
import java.io.File;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.FileReader;
import java.security.Key;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import javax.crypto.*;
import java.io.PrintWriter;
import java.io.FileWriter;
import java.util.*;
import java.io.*;
// Don't forget to import any supporting classes you plan to use.
public class Crypto
{
private Scanner fileText;
private PrintWriter fileEncrypt;
private Scanner inputFile;
private PrintWriter outputFile;
private static final String ALGO = "AES/CBC/PKCS5Padding";
private byte[] keyValue;
public Crypto(String key)
{
keyValue = key.getBytes();
}
public String encrypt(String Data) throws Exception
{
Key key = generateKey();
Cipher c = Cipher.getInstance(ALGO);
c.init(Cipher.ENCRYPT_MODE, key);
byte[] encVal = c.doFinal(Data.getBytes());
String encryptedValue = new BASE64Encoder().encode(encVal);
return encryptedValue;
}
public String decrypt(String encryptedData) throws Exception
{
Key key = generateKey();
Cipher c = Cipher.getInstance(ALGO);
c.init(Cipher.DECRYPT_MODE, key);
byte[] decodedValue = new BASE64Decoder().decodeBuffer(encryptedData);
byte[] decValue = c.doFinal(decodedValue);
String decryptedValue = new String(decValue);
return decryptedValue;
}
public Key generateKey() throws Exception
{
Key key = new SecretKeySpec(keyValue, "AES");
return key;
}
// encrypt_decrypt("ENCRYPT", "CryptoPlaintext.txt", "CryptoCiphertext.txt" )
// encrypt_decrypt("DECRYPT", "CryptoCiphertext.txt", "CryptoDeciphered.txt")
public void encrypt_decrypt(String function_type , String source_file , String
target_file)
{
String lineValue = "";
String convertedValue = "";
try
{
inputFile = new Scanner(new File(source_file));
}
catch(Exception e)
{
System.out.println("( " + source_file + ") - File Opening Error");
}
try
{
outputFile = new PrintWriter(new FileWriter(target_file));
}
catch(Exception e)
{
System.out.println("( " + target_file + ") - File Opening Error");
}
while(inputFile.hasNext())
{
lineValue = inputFile.nextLine();
System.out.println("Source Line: " + lineValue);
try
{
if (function_type == "ENCRYPT")
{
convertedValue = encrypt(lineValue);
}
else if (function_type == "DECRYPT")
{
convertedValue = decrypt(lineValue);
}
}
catch(Exception e)
{
System.out.println(e);
}
System.out.println("Converted Line : " + convertedValue);
outputFile.write(convertedValue);
}
inputFile.close();
outputFile.close();
}
public static void main( String args[] ) throws IOException
{
// Write your code here...
// You will read from CryptoPlaintext.txt and write to
CryptoCiphertext.txt.
Crypto c = new Crypto("dk201anckse29sns");
c.encrypt_decrypt("ENCRYPT", "CryptoPlaintext.txt", "CryptoCiphertext.txt"
);
c.encrypt_decrypt("DECRYPT", "CryptoCiphertext.txt",
"CryptoDeciphered.txt");
//
// And then read from CryptoCiphertext.txt and write to
CryptoDeciphered.txt.
//
// DON'T forget your comments!
// =============================== DO NOT MODIFY ANY CODE BELOW HERE
==============================
// Compare the files
System.out.println(compareFiles() ? "The files are identical!" : "The
files are NOT identical.");
}
/**
* Compares the Plaintext file with the Deciphered file.
*
* #return true if files match, false if they do not
*/
public static boolean compareFiles() throws IOException
{
Scanner pt = new Scanner(new File("CryptoPlaintext.txt")); // Open the
plaintext file
Scanner dc = new Scanner(new File("CryptoDeciphered.txt")); // Open the
deciphered file
// Read through the files and compare them record by record.
// If any of the records do not match, the files are not identical.
while(pt.hasNextLine() && dc.hasNextLine())
if(!pt.nextLine().equals(dc.nextLine())) return false;
// If we have any records left over, then the files are not identical.
if(pt.hasNextLine() || dc.hasNextLine()) return false;
// The files are identical.
return true;
}
}
There are two errors in your code:
You forgot to generate a random IV and prefix it to your ciphertext (before encoding it to base 64). You'd need to find the IV from your ciphertext and then retrieve it back again during decryption.
Note that CBC code requires an IV indistinguishable from random. You can create it using new SecureRandom (only during encryption, of course) and IvParameterSpec. The code will probably run without this as the default implementation in Java defaults on an all-zero IV. Possibly that is enough for this assignment.
But that's not what generates the error; that's much more of a banality:
You're calling outputFile.write instead of outputFile.println which means that newlines aren't inserted, and all base 64 encodings are put in a single line.
Note that you should not use any classes from sun.misc. Those are private to the Java implementation and are not part of the Java API. The new Java versions have java.util.Base64 for your convenience. Actually, the sun.misc version may insert line endings within the base 64 encoding that will break your code for longer lines.
For example:
package nl.owlstead.stackoverflow;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.security.Key;
import java.util.Base64;
import java.util.Scanner;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class Crypto {
private Scanner inputFile;
private PrintWriter outputFile;
private static final String ALGO = "AES/CBC/PKCS5Padding";
private byte[] keyValue;
public Crypto(String key) {
keyValue = key.getBytes();
}
public String encrypt(String Data) throws Exception {
Key key = generateKey();
Cipher c = Cipher.getInstance(ALGO);
c.init(Cipher.ENCRYPT_MODE, key,
new IvParameterSpec(new byte[c.getBlockSize()]));
byte[] encVal = c.doFinal(Data.getBytes());
String encryptedValue = Base64.getEncoder().encodeToString(encVal);
return encryptedValue;
}
public String decrypt(String encryptedData) throws Exception {
Key key = generateKey();
Cipher c = Cipher.getInstance(ALGO);
c.init(Cipher.DECRYPT_MODE, key,
new IvParameterSpec(new byte[c.getBlockSize()]));
byte[] decodedValue = Base64.getDecoder().decode(encryptedData);
byte[] decValue = c.doFinal(decodedValue);
String decryptedValue = new String(decValue);
return decryptedValue;
}
public Key generateKey() throws Exception {
Key key = new SecretKeySpec(keyValue, "AES");
return key;
}
public void encrypt_decrypt(String function_type, String source_file,
String target_file) {
String lineValue = "";
String convertedValue = "";
try {
inputFile = new Scanner(new File(source_file));
} catch (Exception e) {
System.out.println("( " + source_file + ") - File Opening Error");
}
try {
outputFile = new PrintWriter(new FileWriter(target_file));
} catch (Exception e) {
System.out.println("( " + target_file + ") - File Opening Error");
}
while (inputFile.hasNext()) {
lineValue = inputFile.nextLine();
System.out.println("Source Line: " + lineValue);
try {
if (function_type == "ENCRYPT") {
convertedValue = encrypt(lineValue);
} else if (function_type == "DECRYPT") {
convertedValue = decrypt(lineValue);
}
} catch (Exception e) {
System.out.println(e);
}
System.out.println("Converted Line : " + convertedValue);
outputFile.println(convertedValue);
}
inputFile.close();
outputFile.close();
}
public static void main(String args[]) throws IOException {
Crypto c = new Crypto("dk201anckse29sns");
c.encrypt_decrypt("ENCRYPT", "CryptoPlaintext.txt",
"CryptoCiphertext.txt");
c.encrypt_decrypt("DECRYPT", "CryptoCiphertext.txt",
"CryptoDeciphered.txt");
System.out.println(compareFiles() ? "The files are identical!"
: "The files are NOT identical.");
}
/**
* Compares the Plaintext file with the Deciphered file.
*
* #return true if files match, false if they do not
*/
public static boolean compareFiles() throws IOException {
Scanner pt = new Scanner(new File("CryptoPlaintext.txt")); // Open the
Scanner dc = new Scanner(new File("CryptoDeciphered.txt")); // Open the
// Read through the files and compare them record by record.
// If any of the records do not match, the files are not identical.
while (pt.hasNextLine() && dc.hasNextLine()) {
String ptl = pt.nextLine();
String dcl = dc.nextLine();
if (!ptl.equals(dcl))
{
System.out.println(ptl);
System.out.println(dcl);
continue;
// return false;
}
}
// If we have any records left over, then the files are not identical.
if (pt.hasNextLine() || dc.hasNextLine())
return false;
// The files are identical.
return true;
}
}
A working solution for you:
Just added a random IV value while initiating your cipher during encrypting and decrypting.
c.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(new byte[16]));
package com.samples;
import java.util.Scanner;
import java.io.File;
import java.io.IOException;
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import java.io.PrintWriter;
import java.io.FileWriter;
// Don't forget to import any supporting classes you plan to use.
public class Crypto
{
private Scanner fileText;
private PrintWriter fileEncrypt;
private Scanner inputFile;
private PrintWriter outputFile;
private static final String ALGO = "AES/CBC/PKCS5Padding";
private byte[] keyValue;
public Crypto(String key)
{
keyValue = key.getBytes();
}
public String encrypt(String Data) throws Exception
{
Key key = generateKey();
Cipher c = Cipher.getInstance(ALGO);
c.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(new byte[16]));
byte[] encVal = c.doFinal(Data.getBytes());
String encryptedValue = new BASE64Encoder().encode(encVal);
return encryptedValue;
}
public String decrypt(String encryptedData) throws Exception
{
Key key = generateKey();
Cipher c = Cipher.getInstance(ALGO);
c.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(new byte[16]));
byte[] decodedValue = new BASE64Decoder().decodeBuffer(encryptedData);
byte[] decValue = c.doFinal(decodedValue);
String decryptedValue = new String(decValue);
return decryptedValue;
}
public Key generateKey() throws Exception
{
Key key = new SecretKeySpec(keyValue, "AES");
return key;
}
// encrypt_decrypt("ENCRYPT", "CryptoPlaintext.txt", "CryptoCiphertext.txt" )
// encrypt_decrypt("DECRYPT", "CryptoCiphertext.txt", "CryptoDeciphered.txt")
public void encrypt_decrypt(String function_type, String source_file, String target_file)
{
String lineValue = "";
String convertedValue = "";
try
{
inputFile = new Scanner(new File(source_file));
}
catch(Exception e)
{
System.out.println("( " + source_file + ") - File Opening Error");
}
try
{
outputFile = new PrintWriter(new FileWriter(target_file));
}
catch(Exception e)
{
System.out.println("( " + target_file + ") - File Opening Error");
}
while(inputFile.hasNext())
{
lineValue = inputFile.nextLine();
System.out.println("Source Line: " + lineValue);
try
{
if (function_type == "ENCRYPT")
{
convertedValue = encrypt(lineValue);
}
else if (function_type == "DECRYPT")
{
convertedValue = decrypt(lineValue);
}
}
catch(Exception e)
{
System.out.println(e);
}
System.out.println("Converted Line : " + convertedValue);
outputFile.write(convertedValue);
}
inputFile.close();
outputFile.close();
}
public static void main( String args[] ) throws IOException
{
// Write your code here...
// You will read from CryptoPlaintext.txt and write to CryptoCiphertext.txt.
Crypto c = new Crypto("dk201anckse29sns");
c.encrypt_decrypt("ENCRYPT", "C:\\Users\\mundrap\\Eclipse_Workspace\\Java-8\\src\\com\\samples\\CryptoPlaintext.txt", "C:\\Users\\mundrap\\Eclipse_Workspace\\Java-8\\src\\com\\samples\\CryptoCiphertext.txt"
);
c.encrypt_decrypt("DECRYPT", "C:\\Users\\mundrap\\Eclipse_Workspace\\Java-8\\src\\com\\samples\\CryptoCiphertext.txt",
"C:\\Users\\mundrap\\Eclipse_Workspace\\Java-8\\src\\com\\samples\\CryptoDeciphered.txt");
//
// And then read from CryptoCiphertext.txt and write to CryptoDeciphered.txt.
//
// DON'T forget your comments!
// =============================== DO NOT MODIFY ANY CODE BELOW HE ==============================
// Compare the files
System.out.println(compareFiles() ? "The files are identical!" : "The files are NOT identical.");
}
/**
* Compares the Plaintext file with the Deciphered file.
*
* #return true if files match, false if they do not
*/
public static boolean compareFiles() throws IOException
{
Scanner pt = new Scanner(new File("C:\\Users\\mundrap\\Eclipse_Workspace\\Java-8\\src\\com\\samples\\CryptoPlaintext.txt")); // Open the plaintext file
Scanner dc = new Scanner(new File("C:\\Users\\mundrap\\Eclipse_Workspace\\Java-8\\src\\com\\samples\\CryptoDeciphered.txt")); // Open the deciphered file
// Read through the files and compare them record by record.
// If any of the records do not match, the files are not identical.
while(pt.hasNextLine() && dc.hasNextLine())
if(!pt.nextLine().equals(dc.nextLine())) return false;
// If we have any records left over, then the files are not identical.
if(pt.hasNextLine() || dc.hasNextLine()) return false;
// The files are identical.
return true;
}
}
I want to exactly build a function which produces a HMAC with a secret key like this site provides:
http://www.freeformatter.com/hmac-generator.html
The Java 8 lib only provides MessageDigest and KeyGenerator which both only support up to SH256.
Also, Google doesn't give me any result for an implementation to generate a HMAC.
Does someone know a implementation?
I have this code to generate an ordinary SH256 but I guess this doesn't help me much:
public static String get_SHA_512_SecurePassword(String passwordToHash) throws Exception {
String generatedPassword = null;
MessageDigest md = MessageDigest.getInstance("SHA-512");
byte[] bytes = md.digest(passwordToHash.getBytes("UTF-8"));
StringBuilder sb = new StringBuilder();
for (int i = 0; i < bytes.length; i++) {
sb.append(Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1));
}
generatedPassword = sb.toString();
System.out.println(generatedPassword);
return generatedPassword;
}
The simplest way can be -
private static final String HMAC_SHA512 = "HmacSHA512";
private static String toHexString(byte[] bytes) {
Formatter formatter = new Formatter();
for (byte b : bytes) {
formatter.format("%02x", b);
}
return formatter.toString();
}
public static String calculateHMAC(String data, String key)
throws SignatureException, NoSuchAlgorithmException, InvalidKeyException
{
SecretKeySpec secretKeySpec = new SecretKeySpec(key.getBytes(), HMAC_SHA512);
Mac mac = Mac.getInstance(HMAC_SHA512);
mac.init(secretKeySpec);
return toHexString(mac.doFinal(data.getBytes()));
}
public static void main(String[] args) throws Exception {
String hmac = calculateHMAC("data", "key");
System.out.println(hmac);
}
You can change the HMAC_SHA512 variable to any of the Mac algorithm and the code will work the same way.
Hope this helps:
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;
public class Test1 {
private static final String HMAC_SHA512 = "HmacSHA512";
public static void main(String[] args) {
Mac sha512Hmac;
String result;
final String key = "Welcome1";
try {
final byte[] byteKey = key.getBytes(StandardCharsets.UTF_8);
sha512Hmac = Mac.getInstance(HMAC_SHA512);
SecretKeySpec keySpec = new SecretKeySpec(byteKey, HMAC_SHA512);
sha512Hmac.init(keySpec);
byte[] macData = sha512Hmac.doFinal("My message".getBytes(StandardCharsets.UTF_8));
// Can either base64 encode or put it right into hex
result = Base64.getEncoder().encodeToString(macData);
//result = bytesToHex(macData);
} catch (UnsupportedEncodingException | InvalidKeyException | NoSuchAlgorithmException e) {
e.printStackTrace();
} finally {
// Put any cleanup here
System.out.println("Done");
}
}
}
For converting from byte array to hex refer this stackoverflow answer : here
Also you can use a little wrapper by Apache Commons codec:
import static org.apache.commons.codec.digest.HmacAlgorithms.HMAC_SHA_512;
import org.apache.commons.codec.digest.HmacUtils;
public class HmacService {
private String sharedSecret;
public HmacService(String sharedSecret) {
this.sharedSecret = sharedSecret;
}
public String calculateHmac(String data) {
return new HmacUtils(HMAC_SHA_512, sharedSecret).hmacHex(data);
}
public boolean checkHmac(String data, String hmacHex) {
return calculateHmac(data).equals(hmacHex);
}
}
You could use Caesar (version 0.6.0 or later):
int blockSize = 128;
String secretKey = "My secret key";
String message = "Message to hash";
System.out.println(
new Hmac(
new ImmutableMessageDigest(
MessageDigest.getInstance("SHA-512")
),
blockSize,
new PlainText(secretKey),
new PlainText(message)
).asHexString()
);
I created ciphertext with javax.crypto.Cipher org.apache.commons.codec.binary.Base64 and using Java like following:
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public final class PwdCipher {
private static final Logger LOG = LoggerFactory.getLogger(PwdCipher.class);
private static final int BASE64_ARG0 = 32;
private static final String SECRET = "tvnw63ufg9gh5392";
private static byte[] linebreak = {};
private static SecretKey key;
private static Cipher cipher;
private static Base64 coder;
static {
key = new SecretKeySpec(SECRET.getBytes(), "AES");
try {
cipher = Cipher.getInstance("AES/ECB/PKCS5Padding", "SunJCE");
} catch (NoSuchAlgorithmException | NoSuchProviderException | NoSuchPaddingException e) {
LOG.debug("Erro ao criar encriptador.", e);
}
coder = new Base64(BASE64_ARG0, linebreak, true);
}
private PwdCipher(){
}
public static synchronized String encrypt(String plainText) {
try {
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] cipherText = cipher.doFinal(plainText.getBytes());
return new String(coder.encode(cipherText));
} catch (Exception e) {
throw new GdocException("Erro ao encriptar senha.", e);
}
}
public static synchronized String decrypt(String codedText) {
try {
byte[] encypted = coder.decode(codedText.getBytes());
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] decrypted = cipher.doFinal(encypted);
return new String(decrypted);
} catch (Exception e) {
throw new GdocException("Erro ao decriptar senha.", e);
}
}
}
I need to decrypt the text (encrypted with class PwdCipher) using Node.js, but when I use the following code:
exports.decryptLdapPassword = function(password){
var key = 'tvnw63ufg9gh5392';
var ciphertext = password;
var crypto = require('crypto');
var decipher = crypto.createDecipher('aes-128-ecb', key);
var decrypted = decipher.update(ciphertext, 'base64', 'utf8');
decrypted += decipher.final('utf8');
return decrypted;
};
It turns out the following exception:
> crypto.js:323 var ret = this._binding.final();
> ^ TypeError: error:00000000:lib(0):func(0):reason(0)
> at Decipher.Cipher.final (crypto.js:323:27)
> at Object.exports.decryptLdapPassword (C:\ProjetosTFS\GDOC\fSuporte\GDoc\Versionado\Fontes\woodstock\server\api\service\service.util.js:14:25)
> at Promise.<anonymous> (C:\ProjetosTFS\GDOC\fSuporte\GDoc\Versionado\Fontes\woodstock\server\api\service\service.controller.js:111:34)
> at Promise.<anonymous> (C:\ProjetosTFS\GDOC\fSuporte\GDoc\Versionado\Fontes\woodstock\node_modules\mongoose\node_modules\mpromise\lib\promise.js:177:8)
> at Promise.emit (events.js:95:17)
> at Promise.emit (C:\ProjetosTFS\GDOC\fSuporte\GDoc\Versionado\Fontes\woodstock\node_modules\mongoose\node_modules\mpromise\lib\promise.js:84:38)
> at Promise.fulfill (C:\ProjetosTFS\GDOC\fSuporte\GDoc\Versionado\Fontes\woodstock\node_modules\mongoose\node_modules\mpromise\lib\promise.js:97:20)
> at Promise.resolve (C:\ProjetosTFS\GDOC\fSuporte\GDoc\Versionado\Fontes\woodstock\node_modules\mongoose\lib\promise.js:114:23)
> at Promise.<anonymous> (C:\ProjetosTFS\GDOC\fSuporte\GDoc\Versionado\Fontes\woodstock\node_modules\mongoose\node_modules\mpromise\lib\promise.js:177:8)
> at Promise.emit (events.js:95:17)
Any idea?
Worked! Solution published in https://github.com/joyent/node/issues/20983#issuecomment-100885608