to SHA-1 - Java Security

Java examples for Security:SHA

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Description

to SHA-1

Demo Code


//package com.java2s;

import java.security.MessageDigest;

public class Main {
    public static String toSha1(String text) {
        try {//from w  w  w  .  ja  v a2 s.  com
            MessageDigest md;
            md = MessageDigest.getInstance("SHA-1");
            byte[] sha1hash = new byte[40];
            md.update(text.getBytes("iso-8859-1"), 0, text.length());
            sha1hash = md.digest();
            return convertToHex(sha1hash);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "";

    }

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

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