Java SHA1 sha1(final String str)

Description

Creates the Sha1 representation of a given string

License

LGPL

Parameter

Parameter	Description
str	- Text to crypt in Sha1

Return

Generated Sha1 hash

Declaration

public static String sha1(final String str) 

Method Source Code

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

import java.nio.ByteBuffer;
import java.nio.CharBuffer;

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    /**/*  w w w. ja  va2 s  . co m*/
     * Creates the Sha1 representation of a given string
     *
     * @param str
     *            - Text to crypt in Sha1
     * @return Generated Sha1 hash
     */
    public static String sha1(final String str) {
        byte[] sha1hash = new byte[40];
        try {
            final MessageDigest md = MessageDigest.getInstance("SHA-1");
            md.update(str.getBytes(StandardCharsets.UTF_8));
            sha1hash = md.digest();
        } catch (final NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

        return toHex(sha1hash);
    }

    /**
     * Generates the Sha1 representation for the empty string
     *
     * @return empty string coded in sha1
     */
    public static String sha1() {
        return sha1("");
    }

    /**
     * Generates the Sha1 representation of a character array
     *
     * @param charArray
     *            - character array to crypt in sha1
     * @return Generated sha1 hash
     */
    public static String sha1(final char[] charArray) {
        byte[] sha1hash = new byte[40];

        try {
            final MessageDigest md = MessageDigest.getInstance("SHA-1");

            final ByteBuffer buf = StandardCharsets.UTF_8.encode(CharBuffer.wrap(charArray));
            final byte[] utf8 = new byte[buf.limit()];
            buf.get(utf8);
            md.update(utf8);

            sha1hash = md.digest();
        } catch (final NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

        return toHex(sha1hash);
    }

    /**
     * Converts data to an hexadecimal string
     *
     * @param data
     *            - Data to convert to hexadecimal
     * @return String in hexadecimal
     */
    private static String toHex(final byte[] data) {
        final StringBuffer buf = new StringBuffer();
        for (final byte element : data) {
            int halfbyte = (element >>> 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 = element & 0x0F;
            } while (two_halfs++ < 1);
        }
        return buf.toString();
    }
}

Related

1. sha1(File file)
2. sha1(File sourceFile)
3. sha1(final byte[] bytes)
4. sha1(final File file)
5. sha1(final String data)
6. sha1(final String string)
7. SHA1(final String text)
8. sha1(final String text)
9. sha1(final String todigest)