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package org.uic.barcode.utils;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.Provider.Service;
import java.security.PublicKey;
import java.security.Security;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
/**
* The Class SecurityUtils.
*/
public class SecurityUtils {
/**
* Find provider by public key.
*
* @param algorithmOid the algorithm oid used to generate the key
* @param keyBytes the encoded bytes of the public key
* @return the provider
*/
public static Provider findPublicKeyProvider(String keyAlgorithmOid, byte[] keyBytes) {
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
String name;
try {
name = AlgorithmNameResolver.getAlgorithmName(AlgorithmNameResolver.TYPE_KEY_GENERATOR_ALG, keyAlgorithmOid, null);
} catch (Exception e2) {
return null;
}
KeyFactory keyFactory = null;
Provider[] provs = Security.getProviders();
for (Provider provider : provs) {
try {
keyFactory = KeyFactory.getInstance(name,provider);
} catch (NoSuchAlgorithmException e1) {
//try next
}
if (keyFactory != null) {
try {
keyFactory.generatePublic(keySpec);
return provider;
} catch (Exception e) {
provider = null;
//try next
}
}
}
return null;
}
/**
* Find private key provider.
*
* @param key the private key
* @return the provider
*/
public static Provider findPrivateKeyProvider(PrivateKey key) {
String name = key.getAlgorithm();
byte[] keyBytes = key.getEncoded();
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = null;
Provider[] provs = Security.getProviders();
for (Provider provider : provs) {
try {
keyFactory = KeyFactory.getInstance(name,provider);
} catch (NoSuchAlgorithmException e1) {
//try next
}
if (keyFactory != null) {
try {
keyFactory.generatePrivate(keySpec);
return provider;
} catch (Exception e) {
provider = null;
//try next
}
}
}
return null;
}
/**
* Convert.
*
* @param key the key
* @param provider the provider
* @return the public key
*/
public static PublicKey convert(PublicKey key, Provider provider) {
PublicKey publicKey;
KeyFactory keyFactory = null;
try {
if (key.getAlgorithm() != null && key.getAlgorithm().toUpperCase().contains("EC") ) {
keyFactory = KeyFactory.getInstance("EC",provider);
} else if (key.getAlgorithm() != null && key.getAlgorithm().length() > 0 ) {
keyFactory = KeyFactory.getInstance("DSA",provider);
} else {
return key;
}
publicKey = keyFactory.generatePublic(new X509EncodedKeySpec(key.getEncoded()));
} catch (InvalidKeySpecException | NoSuchAlgorithmException e) {
return key;
}
return publicKey;
}
/**
* Convert.
*
* @param key the key
* @param provider the provider
* @return the private key
*/
public static PrivateKey convert(PrivateKey key, Provider provider) {
PrivateKey privateKey;
KeyFactory keyFactory = null;
try {
if (key.getAlgorithm() != null && key.getAlgorithm().toUpperCase().contains("EC") ) {
keyFactory = KeyFactory.getInstance("EC",provider);
} else if (key.getAlgorithm() != null && key.getAlgorithm().length() > 0 ) {
keyFactory = KeyFactory.getInstance("DSA",provider);
} else {
return key;
}
privateKey = keyFactory.generatePrivate(new PKCS8EncodedKeySpec(key.getEncoded()));
} catch (InvalidKeySpecException | NoSuchAlgorithmException e) {
return key;
}
return privateKey;
}
/**
* Find signature provider.
*
* @param encoded the encoded
* @param oid the oid
* @return the provider
*/
public static Provider findSignatureProvider(byte[] encoded, String oid) {
KeyFactory keyFactory = null;
String signatureAlgorithmName = null;
Provider[] provs = Security.getProviders();
for (Provider provider : provs) {
try {
Service service = provider.getService(AlgorithmNameResolver.TYPE_SIGNATURE_ALG, oid);
if (service != null) {
signatureAlgorithmName = service.getAlgorithm();
if (signatureAlgorithmName != null && signatureAlgorithmName.length() > 0) {
if (signatureAlgorithmName.toUpperCase().contains("EC") ) {
keyFactory = KeyFactory.getInstance("EC",provider);
} else {
keyFactory = KeyFactory.getInstance("DSA",provider);
}
if (keyFactory != null) {
X509EncodedKeySpec spec = new X509EncodedKeySpec(encoded);
//try to encode the key
keyFactory.generatePublic(spec);
}
}
}
} catch (Exception e1) {
keyFactory = null;
}
if (keyFactory != null) {
return keyFactory.getProvider();
}
}
return null;
}
}
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