VircurexSha2Digest.java

package org.knowm.xchange.vircurex.service;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.knowm.xchange.utils.DigestUtils;

/**
 * This may be used as the value of a @HeaderParam, @QueryParam or @PathParam to create a digest of the post body (composed of @FormParam's). Don't
 * use as the value of a @FormParam, it will probably cause an infinite loop.
 * <p/>
 * This may be used for REST APIs where some parameters' values must be digests of other parameters. An example is the MtGox API v1, where the
 * Rest-Sign header parameter must be a digest of the request body (which is composed of @FormParams).
 */
public class VircurexSha2Digest {

  private static final String SHA_256 = "SHA-256";
  private MessageDigest digest;
  private final String secretWord;

  /**
   * Constructor
   *
   * @param aSecretWord
   * @throws IllegalArgumentException if key is invalid (cannot be base-64-decoded or the decoded key is invalid).
   */
  public VircurexSha2Digest(String aSecretWord, String aUserName, String aTimeStamp, long aNonce, String aMethod, String anOrderType,
      String anOrderAmount, String aTransactionCurrency, String aLimitPrice, String aTradeableCurrency) throws IllegalArgumentException {

    try {
      digest = MessageDigest.getInstance(SHA_256);
      digest.update((aSecretWord + ";" + aUserName + ";" + aTimeStamp + ";" + aNonce + ";" + aMethod + ";" + anOrderType + ";" + anOrderAmount + ";"
          + aTransactionCurrency + ";" + aLimitPrice + ";" + aTradeableCurrency).getBytes());
    } catch (NoSuchAlgorithmException e) {
      throw new RuntimeException(e.getMessage(), e);
    }
    secretWord = DigestUtils.bytesToHex(digest.digest());
  }

  public VircurexSha2Digest(String aSecretWord, String aUserName, String aTimeStamp, long aNonce, String aMethod) {

    try {
      digest = MessageDigest.getInstance(SHA_256);
      digest.update((aSecretWord + ";" + aUserName + ";" + aTimeStamp + ";" + aNonce + ";" + aMethod).getBytes());
    } catch (NoSuchAlgorithmException e) {
      throw new RuntimeException(e.getMessage(), e);
    }
    secretWord = DigestUtils.bytesToHex(digest.digest());
  }

  public VircurexSha2Digest(String aSecretWord, String aUserName, String aTimeStamp, long aNonce, String aMethod, String anOrderId) {

    try {
      digest = MessageDigest.getInstance(SHA_256);
      digest.update((aSecretWord + ";" + aUserName + ";" + aTimeStamp + ";" + aNonce + ";" + aMethod + ";" + anOrderId).getBytes());
    } catch (NoSuchAlgorithmException e) {
      throw new RuntimeException(e.getMessage(), e);
    }
    secretWord = DigestUtils.bytesToHex(digest.digest());
  }

  @Override
  public String toString() {

    return secretWord;
  }

}