// Java Signature And Verification Utils
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import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.KeyPair;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import org.apache.commons.io.output.ByteArrayOutputStream;
import org.bouncycastle.util.encoders.Base64Encoder;
public class Utils {
private static final String STRING_ENCODING = "UTF-8";
public static KeyStore loadKeyStore(File file, String storePassword)
throws IOException, KeyStoreException, NoSuchAlgorithmException,
CertificateException {
return loadKeyStore(KeyStore.getDefaultType(), file, storePassword);
}
public static KeyStore loadKeyStore(String storeType, File file,
String storePassword) throws IOException, KeyStoreException,
NoSuchAlgorithmException, CertificateException {
FileInputStream is = new FileInputStream(file);
try {
KeyStore keystore = KeyStore.getInstance(storeType);
keystore.load(is,
storePassword == null ? null : storePassword.toCharArray());
return keystore;
} finally {
is.close();
}
}
public static KeyPair getKeyPair(KeyStore keyStore, String alias,
String keyPassword) throws UnrecoverableKeyException,
KeyStoreException, NoSuchAlgorithmException,
PrivateKeyNotFoundException {
Key key = getKey(keyStore, alias, keyPassword);
if (key instanceof PrivateKey) {
return new KeyPair(getPublicKey(keyStore, alias), (PrivateKey) key);
} else {
throw new PrivateKeyNotFoundException("The given key " + alias
+ " is not a private key.");
}
}
public static PublicKey getPublicKey(KeyStore keyStore, String alias)
throws KeyStoreException {
return keyStore.getCertificate(alias).getPublicKey();
}
public static Key getKey(KeyStore keyStore, String alias, String keyPassword)
throws KeyStoreException, NoSuchAlgorithmException,
UnrecoverableKeyException {
return keyStore.getKey(alias,
keyPassword == null ? null : keyPassword.toCharArray());
}
public static PublicKey loadPublicKeyFromCertificate(File certificateFile)
throws FileNotFoundException, CertificateException, IOException {
return loadPublicKeyFromCertificate(certificateFile, "X.509");
}
public static PublicKey loadPublicKeyFromCertificate(File certificateFile,
String certificateType) throws FileNotFoundException,
CertificateException, IOException {
PublicKey publicKey = null;
FileInputStream fis = new FileInputStream(certificateFile);
try {
CertificateFactory cf = CertificateFactory
.getInstance(certificateType);
java.security.cert.Certificate cert = cf.generateCertificate(fis);
publicKey = cert.getPublicKey();
} finally {
fis.close();
}
return publicKey;
}
public static boolean verify(File certificateFile, File signatureFile,
File dataFile, String signAlgorithm) throws FileNotFoundException,
IOException, CertificateException, NoSuchAlgorithmException,
InvalidKeyException, SignatureException {
byte[] sigToVerify = null;
FileInputStream sigfis = new FileInputStream(signatureFile);
try {
sigToVerify = new byte[sigfis.available()];
sigfis.read(sigToVerify);
} finally {
sigfis.close();
}
return verify(dataFile, sigToVerify, certificateFile, signAlgorithm);
}
public static boolean verify(File dataFile, byte[] sigToVerify,
File certificateFile, String signAlgorithm)
throws FileNotFoundException, IOException, CertificateException,
NoSuchAlgorithmException, InvalidKeyException, SignatureException {
FileInputStream keyfis = new FileInputStream(certificateFile);
try {
byte[] encKey = new byte[keyfis.available()];
keyfis.read(encKey);
} finally {
keyfis.close();
}
PublicKey pubKey = loadPublicKeyFromCertificate(certificateFile);
Signature sig = Signature.getInstance(signAlgorithm);
sig.initVerify(pubKey);
FileInputStream datafis = new FileInputStream(dataFile);
try {
BufferedInputStream bufin = new BufferedInputStream(datafis);
try {
byte[] buffer = new byte[1024];
int len;
while (bufin.available() != 0) {
len = bufin.read(buffer);
sig.update(buffer, 0, len);
}
} finally {
if (bufin != null) {
bufin.close();
}
}
} finally {
if (datafis != null) {
datafis.close();
}
}
return sig.verify(sigToVerify);
}
public static boolean verifyUsingBase64Decode(File certificateFile,
File signatureFile, File dataFile, String signAlgorithm)
throws FileNotFoundException, IOException, CertificateException,
NoSuchAlgorithmException, InvalidKeyException, SignatureException {
byte[] sigToVerify = null;
FileInputStream sigfis = new FileInputStream(signatureFile);
try {
sigToVerify = new byte[sigfis.available()];
sigfis.read(sigToVerify);
} finally {
sigfis.close();
}
ByteArrayOutputStream signStream = new ByteArrayOutputStream();
new Base64Encoder().decode(sigToVerify, 0, sigToVerify.length,
signStream);
return verify(dataFile, signStream.toByteArray(), certificateFile,
signAlgorithm);
}
public static boolean verify(File certificateFile, File signatureFile,
String data, String signAlgorithm) throws FileNotFoundException,
IOException, CertificateException, NoSuchAlgorithmException,
InvalidKeyException, SignatureException {
byte[] sigToVerify = null;
FileInputStream sigfis = new FileInputStream(signatureFile);
try {
sigToVerify = new byte[sigfis.available()];
sigfis.read(sigToVerify);
} finally {
sigfis.close();
}
return verify(data, sigToVerify, certificateFile, signAlgorithm);
}
public static boolean verify(String dataFile, byte[] sigToVerify,
File certificateFile, String signAlgorithm)
throws FileNotFoundException, IOException, CertificateException,
NoSuchAlgorithmException, InvalidKeyException, SignatureException {
FileInputStream keyfis = new FileInputStream(certificateFile);
try {
byte[] encKey = new byte[keyfis.available()];
keyfis.read(encKey);
} finally {
keyfis.close();
}
PublicKey pubKey = loadPublicKeyFromCertificate(certificateFile);
Signature sig = Signature.getInstance(signAlgorithm);
sig.initVerify(pubKey);
sig.update(dataFile.getBytes(STRING_ENCODING));
return sig.verify(sigToVerify);
}
public static boolean verifyUsingBase64Decode(File certificateFile,
File signatureFile, String data, String signAlgorithm)
throws FileNotFoundException, IOException, CertificateException,
NoSuchAlgorithmException, InvalidKeyException, SignatureException {
byte[] sigToVerify = null;
FileInputStream sigfis = new FileInputStream(signatureFile);
try {
sigToVerify = new byte[sigfis.available()];
sigfis.read(sigToVerify);
} finally {
sigfis.close();
}
ByteArrayOutputStream signStream = new ByteArrayOutputStream();
new Base64Encoder().decode(sigToVerify, 0, sigToVerify.length,
signStream);
return verify(data, signStream.toByteArray(), certificateFile,
signAlgorithm);
}
protected static void writeToFileUsingBase64Encode(byte[] realSig, File f2)
throws FileNotFoundException, IOException {
FileOutputStream sigfos2 = new FileOutputStream(f2);
new Base64Encoder().encode(realSig, 0, realSig.length, sigfos2);
sigfos2.close();
}
protected static void writeToFile(File file, byte[] realSig)
throws FileNotFoundException, IOException {
FileOutputStream sigfos = new FileOutputStream(file);
try {
sigfos.write(realSig);
} finally {
sigfos.close();
}
}
public static byte[] sign(File dataToSign, File keyStoreFile,
String storePassword, String alias, String keyPassword,
String signAlgorithm) throws IOException, KeyStoreException,
NoSuchAlgorithmException, CertificateException,
UnrecoverableKeyException, PrivateKeyNotFoundException,
InvalidKeyException, FileNotFoundException, SignatureException {
Signature dsa = null;
KeyStore keyStore = loadKeyStore(keyStoreFile, storePassword);
KeyPair pair = getKeyPair(keyStore, alias, keyPassword);
PrivateKey priv = pair.getPrivate();
dsa = Signature.getInstance(signAlgorithm);
dsa.initSign(priv);
FileInputStream fis = new FileInputStream(dataToSign);
try {
BufferedInputStream bufin = new BufferedInputStream(fis);
try {
byte[] buffer = new byte[1024];
int len;
while (bufin.available() != 0) {
len = bufin.read(buffer);
dsa.update(buffer, 0, len);
}
} finally {
if (bufin != null) {
bufin.close();
}
}
} finally {
if (fis != null) {
fis.close();
}
}
return dsa.sign();
}
public static byte[] sign(String dataToSign, File keyStoreFile,
String storePassword, String alias, String keyPassword,
String signAlgorithm) throws IOException, KeyStoreException,
NoSuchAlgorithmException, CertificateException,
UnrecoverableKeyException, PrivateKeyNotFoundException,
InvalidKeyException, FileNotFoundException, SignatureException {
Signature dsa = null;
KeyStore keyStore = loadKeyStore(keyStoreFile, storePassword);
KeyPair pair = getKeyPair(keyStore, alias, keyPassword);
PrivateKey priv = pair.getPrivate();
dsa = Signature.getInstance(signAlgorithm);
dsa.initSign(priv);
dsa.update(dataToSign.getBytes(STRING_ENCODING));
return dsa.sign();
}
}
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