MD5, SHA-256 코드

// MD5

public String testMD5(String str){

String MD5 = ""; 

try{

MessageDigest md = MessageDigest.getInstance("MD5"); 

md.update(str.getBytes()); 

byte byteData[] = md.digest();

StringBuffer sb = new StringBuffer(); 

for(int i = 0 ; i < byteData.length ; i++){

sb.append(Integer.toString((byteData[i]&0xff) + 0x100, 16).substring(1));

}

MD5 = sb.toString();

}catch(NoSuchAlgorithmException e){

e.printStackTrace(); 

MD5 = null; 

}

return MD5;

}

// SHA-256

public String testSHA256(String str){

String SHA = ""; 

try{

MessageDigest sh = MessageDigest.getInstance("SHA-256"); 

sh.update(str.getBytes()); 

byte byteData[] = sh.digest();

StringBuffer sb = new StringBuffer(); 

for(int i = 0 ; i < byteData.length ; i++){

sb.append(Integer.toString((byteData[i]&0xff) + 0x100, 16).substring(1));

}

SHA = sb.toString();

}catch(NoSuchAlgorithmException e){

e.printStackTrace(); 

SHA = null; 

}

return SHA;

}