(JAVA) SHA-256 - 원본 Programing/Java 2012. 3. 22. 16:10

JAVA SHA-256 원본입니다.
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01.import java.security.MessageDigest;
02.import java.io.FileInputStream;
03.public class SHA256
04.{
05.    public static void main(String[] args)throws Exception
06.    {
07.        MessageDigest md = MessageDigest.getInstance("SHA-256");
08.        FileInputStream fis = new FileInputStream("d:\\abc.txt");
09.        byte[] dataBytes = new byte[1024];
10.        int nread = 0;
11.        while ((nread = fis.read(dataBytes)) != -1) {
12.          md.update(dataBytes, 0, nread);
13.        };
14.        byte[] mdbytes = md.digest();
15.        //convert the byte to hex format method 1aa
16.        StringBuffer sb = new StringBuffer();
17.        for (int i = 0; i < mdbytes.length; i++) {
18.          sb.append(Integer.toString((mdbytes[i] & 0xff) + 0x100, 16).substring(1));
19.        }
20.        System.out.println("Hex format : " + sb.toString());
21.       //convert the byte to hex format method 2
22.        StringBuffer hexString = new StringBuffer();
23.     for (int i=0;i < mdbytes.length; i++) {
24.       hexString.append(Integer.toHexString(0xFF & mdbytes[i]));
25.     }
26.     System.out.println("Hex format : " + hexString.toString());
27.    }
28.}

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