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package org.openecomp.sdc.securityutil;
import java.security.SecureRandom;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
public class CipherUtil {
private static Logger log = LoggerFactory.getLogger( CipherUtil.class.getName());
private static final String ALGORITHM = "AES";
private static final String ALGORYTHM_DETAILS = ALGORITHM + "/CBC/PKCS5PADDING";
private static final String CIPHER_PROVIDER = "SunJCE";
private static final int BLOCK_SIZE = 128;
private static final int BYTE_SIZE = 8;
private static final int IV_SIZE = BLOCK_SIZE / BYTE_SIZE;
private static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
private static final String ALGORITHM_NAME = "SHA1PRNG";
/**
* Encrypt the text using the secret key in key.properties file
*
* @param value string to encrypt
* @return The encrypted string
* @throws CipherUtilException
* In case of issue with the encryption
*/
public static String encryptPKC(String value, String base64key) throws CipherUtilException {
Cipher cipher;
byte[] iv = new byte[IV_SIZE];
byte[] finalByte;
try {
cipher = Cipher.getInstance(ALGORYTHM_DETAILS, CIPHER_PROVIDER);
SecureRandom secureRandom = SecureRandom.getInstance(ALGORITHM_NAME);
secureRandom.nextBytes(iv);
IvParameterSpec ivspec = new IvParameterSpec(iv);
cipher.init(Cipher.ENCRYPT_MODE, getSecretKeySpec(base64key), ivspec);
finalByte = cipher.doFinal(value.getBytes());
} catch (Exception ex) {
log.error("encrypt failed", ex);
throw new CipherUtilException(ex);
}
return Base64.encodeBase64String(addAll(iv, finalByte));
}
/**
* Decrypts the text using the secret key in key.properties file.
*
* @param message
* The encrypted string that must be decrypted using the ONAP Portal
* Encryption Key
* @return The String decrypted
* @throws CipherUtilException
* if any decryption step fails
*/
public static String decryptPKC(String message, String base64key) throws CipherUtilException {
byte[] encryptedMessage = Base64.decodeBase64(message);
Cipher cipher;
byte[] decrypted;
try {
cipher = Cipher.getInstance(ALGORYTHM_DETAILS, CIPHER_PROVIDER);
IvParameterSpec ivspec = new IvParameterSpec(subarray(encryptedMessage, 0, IV_SIZE));
byte[] realData = subarray(encryptedMessage, IV_SIZE, encryptedMessage.length);
cipher.init(Cipher.DECRYPT_MODE, getSecretKeySpec(base64key), ivspec);
decrypted = cipher.doFinal(realData);
} catch (Exception ex) {
log.error("decrypt failed", ex);
throw new CipherUtilException(ex);
}
return new String(decrypted);
}
private static SecretKeySpec getSecretKeySpec(String keyString) {
byte[] key = Base64.decodeBase64(keyString);
return new SecretKeySpec(key, ALGORITHM);
}
private static byte[] clone(byte[] array) {
return array == null ? null : array.clone();
}
private static byte[] addAll(byte[] array1, byte[] array2) {
if (array1 == null) {
return clone(array2);
} else if (array2 == null) {
return clone(array1);
} else {
byte[] joinedArray = new byte[array1.length + array2.length];
System.arraycopy(array1, 0, joinedArray, 0, array1.length);
System.arraycopy(array2, 0, joinedArray, array1.length, array2.length);
return joinedArray;
}
}
private static byte[] subarray(byte[] array, int startIndexInclusive, int endIndexExclusive) {
if (array == null) {
return null;
} else {
if (startIndexInclusive < 0) {
startIndexInclusive = 0;
}
if (endIndexExclusive > array.length) {
endIndexExclusive = array.length;
}
int newSize = endIndexExclusive - startIndexInclusive;
if (newSize <= 0) {
return EMPTY_BYTE_ARRAY;
} else {
byte[] subarray = new byte[newSize];
System.arraycopy(array, startIndexInclusive, subarray, 0, newSize);
return subarray;
}
}
}
}
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