Created
August 6, 2012 11:29
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Helper class for RSA encryption and key generation(private_key.xml for .net integration)
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import java.net.URLEncoder; | |
import java.security.Key; | |
import java.security.KeyFactory; | |
import java.security.KeyPair; | |
import java.security.KeyPairGenerator; | |
import java.security.PublicKey; | |
import java.security.interfaces.RSAPrivateCrtKey; | |
import java.security.spec.PKCS8EncodedKeySpec; | |
import java.security.spec.RSAPublicKeySpec; | |
import java.util.HashMap; | |
import java.util.Map; | |
import javax.crypto.Cipher; | |
import org.apache.commons.codec.binary.Base64; | |
import org.springframework.beans.factory.annotation.Autowired; | |
import org.springframework.stereotype.Component; | |
import com.isbank.tane.analyticalapplications.PortalSettingsService; | |
@Component | |
public class RSAHelper { | |
@Autowired | |
private PortalSettingsService settings; | |
private static final String CHAR_ENCODING = "UTF-8"; | |
private static final String PUBLIC_KEY_MODULUS = "public_key_modulus"; | |
private static final String PUBLIC_KEY_EXPONENT = "public_key_exponent"; | |
private static final String PRIVATE_KEY_XML = "private_key_xml"; | |
public String encrypt(String data) { | |
try { | |
KeyFactory fact = KeyFactory.getInstance("RSA"); | |
RSAPublicKeySpec publicKeySpec = new RSAPublicKeySpec( | |
settings.getRSAPublicKeyModulus(), | |
settings.getRSAPublicKeyExponent()); | |
PublicKey pubKey = fact.generatePublic(publicKeySpec); | |
Cipher cipher = Cipher.getInstance("RSA"); | |
cipher.init(Cipher.ENCRYPT_MODE, pubKey); | |
byte[] cipherData = cipher.doFinal(data.getBytes(CHAR_ENCODING)); | |
String encryptedString = Base64.encodeBase64String(cipherData); | |
return URLEncoder.encode(encryptedString, CHAR_ENCODING); | |
} catch (Exception e) { | |
return ""; | |
} | |
} | |
public Map<String, Object> generateKeys() throws Exception { | |
Map<String, Object> retVal = new HashMap<String, Object>(); | |
KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA"); | |
kpg.initialize(1024); | |
KeyPair kp = kpg.genKeyPair(); | |
Key publicKey = kp.getPublic(); | |
Key privateKey = kp.getPrivate(); | |
KeyFactory fact = KeyFactory.getInstance("RSA"); | |
RSAPublicKeySpec pub = (RSAPublicKeySpec) fact.getKeySpec(publicKey, | |
RSAPublicKeySpec.class); | |
retVal.put(PUBLIC_KEY_MODULUS, pub.getModulus() + ""); | |
retVal.put(PUBLIC_KEY_EXPONENT, pub.getPublicExponent() + ""); | |
PKCS8EncodedKeySpec pvkKeySpec = new PKCS8EncodedKeySpec( | |
privateKey.getEncoded()); | |
RSAPrivateCrtKey pvkKey = (RSAPrivateCrtKey) fact | |
.generatePrivate(pvkKeySpec); | |
retVal.put(PRIVATE_KEY_XML, privatekeyinfoToXMLRSAPriKey(pvkKey)); | |
return retVal; | |
} | |
private String privatekeyinfoToXMLRSAPriKey(RSAPrivateCrtKey pvkKey) { | |
try { | |
StringBuffer buff = new StringBuffer(1024); | |
buff.append("<RSAKeyValue>"); | |
buff.append("<Modulus>" | |
+ b64encode(removeMSZero(pvkKey.getModulus().toByteArray())) | |
+ "</Modulus>"); | |
buff.append("<Exponent>" | |
+ b64encode(removeMSZero(pvkKey.getPublicExponent() | |
.toByteArray())) + "</Exponent>"); | |
buff.append("<P>" | |
+ b64encode(removeMSZero(pvkKey.getPrimeP().toByteArray())) | |
+ "</P>"); | |
buff.append("<Q>" | |
+ b64encode(removeMSZero(pvkKey.getPrimeQ().toByteArray())) | |
+ "</Q>"); | |
buff.append("<DP>" | |
+ b64encode(removeMSZero(pvkKey.getPrimeExponentP() | |
.toByteArray())) + "</DP>"); | |
buff.append("<DQ>" | |
+ b64encode(removeMSZero(pvkKey.getPrimeExponentQ() | |
.toByteArray())) + "</DQ>"); | |
buff.append("<InverseQ>" | |
+ b64encode(removeMSZero(pvkKey.getCrtCoefficient() | |
.toByteArray())) + "</InverseQ>"); | |
buff.append("<D>" | |
+ b64encode(removeMSZero(pvkKey.getPrivateExponent() | |
.toByteArray())) + "</D>"); | |
buff.append("</RSAKeyValue>"); | |
return buff.toString(); | |
} catch (Exception e) { | |
return null; | |
} | |
} | |
private byte[] removeMSZero(byte[] data) { | |
byte[] data1; | |
int len = data.length; | |
if (data[0] == 0) { | |
data1 = new byte[data.length - 1]; | |
System.arraycopy(data, 1, data1, 0, len - 1); | |
} else | |
data1 = data; | |
return data1; | |
} | |
private final String b64encode(byte[] data) { | |
return new String(Base64.encodeBase64Chunked((data))).trim(); | |
} | |
} |
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