암호화하기 1 ( SHA256)

출처 : http://fruitdev.tistory.com/14

public String getEncSHA256(String txt) throws Exception{
    StringBuffer sbuf = new StringBuffer();
     
    MessageDigest mDigest = MessageDigest.getInstance("SHA-256");
    mDigest.update(txt.getBytes());
     
    byte[] msgStr = mDigest.digest() ;
     
    for(int i=0; i < msgStr.length; i++){
        byte tmpStrByte = msgStr[i];
        String tmpEncTxt = Integer.toString((tmpStrByte & 0xff) + 0x100, 16).substring(1);
         
        sbuf.append(tmpEncTxt) ;
    }
     
    return sbuf.toString();
}