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package com.sun.xml.util;

import java.security.NoSuchAlgorithmException;

import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;

import org.apache.xml.security.algorithms.JCEMapper;
import org.apache.xml.security.encryption.XMLCipher;

public class XMLCipherAdapter {
  /**
   * Construct an Cipher object. Some JDKs don't support RSA/ECB/OAEPPadding, so add an additional action.
   * @param algorithm
   * @return the Cipher
   * @throws NoSuchPaddingException 
   * @throws NoSuchAlgorithmException 
  */
  public static Cipher constructCipher(String algorithm)
      throws  NoSuchPaddingException, NoSuchAlgorithmException {
    String jceAlgorithm = JCEMapper.translateURItoJCEID(algorithm);

    Cipher cipher;
    try {
      cipher = Cipher.getInstance(jceAlgorithm);
    } catch (NoSuchAlgorithmException nsae) {
      if (XMLCipher.RSA_OAEP.equals(algorithm)) {
          cipher = Cipher.getInstance("RSA/ECB/OAEPWithSHA1AndMGF1Padding");
      } else {
        throw nsae;
      }
    }
    return cipher;
  }
}