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package io.prismic.android;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

class Crypto {

  private static String convertToHex(byte[] data) {
    StringBuilder buf = new StringBuilder();
    for (byte b : data) {
      int halfbyte = (b >>> 4) & 0x0F;
      int two_halfs = 0;
      do {
        buf.append((0 <= halfbyte) && (halfbyte <= 9) ? (char) ('0' + halfbyte) : (char) ('a' + (halfbyte - 10)));
        halfbyte = b & 0x0F;
      } while (two_halfs++ < 1);
    }
    return buf.toString();
  }

  public static String SHA1(String text) throws NoSuchAlgorithmException, UnsupportedEncodingException {
    MessageDigest md = MessageDigest.getInstance("SHA-1");
    md.update(text.getBytes("iso-8859-1"), 0, text.length());
    byte[] sha1hash = md.digest();
    return convertToHex(sha1hash);
  }

}