Tornado 의 블로그

import java.io.*;
import java.security.*;
import sun.misc.*;

public class TestSHA{
 public static void main(String[] args) throws Exception {

  byte[] txtByte = "테스트테스트".getBytes();

  MessageDigest md = MessageDigest.getInstance("SHA-1");

  md.update(txtByte);

  byte[] digest = md.digest();

  BASE64Encoder encoder = new BASE64Encoder();

  String base64 = encoder.encode(digest);

        // should be 20 bytes, 160 bits long
        System.out.println( digest.length );

        // dump out the hash
        for ( byte b : digest )
        {
            System.out.print( Integer.toHexString( b & 0xff )  );
        }

  //String result = new String(digest.toCha);

  System.out.println("\r\n" + toString(digest, 0, digest.length));

  //System.out.println("hexaString : " + HexString.bufferToHex(md.digest()));

 }

 private static final char[] HEX_DIGITS = "0123456789abcdef".toCharArray();


 public static final String toString(byte[] ba, int offset, int length) {
      char[] buf = new char[length * 2];
      for (int i = 0, j = 0, k; i < length; ) {
         k = ba[offset + i++];
         buf[j++] = HEX_DIGITS[(k >>> 4) & 0x0F];
         buf[j++] = HEX_DIGITS[ k        & 0x0F];
      }
      return new String(buf);
  }

}