Java SHA1 sha1(String input)

Description

Return a string of 40 lower case hex characters.

License

Apache License

Parameter

Parameter	Description
input	a parameter

Return

a string of 40 hex characters

Declaration

public static String sha1(String input) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    /**//w w  w  . j ava  2s .  c  o  m
     * Return a string of 40 lower case hex characters.
     * 
     * @param input
     * @return a string of 40 hex characters
     */
    public static String sha1(String input) {
        String hexHash = null;
        try {
            MessageDigest md = MessageDigest.getInstance("SHA1");
            md.update(input.getBytes());
            byte[] output = md.digest();
            hexHash = bytesToLowerCaseHex(output);
        } catch (NoSuchAlgorithmException nsae) {
            throw new RuntimeException(nsae);
        }
        return hexHash;
    }

    private static String bytesToLowerCaseHex(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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