hash String by algorithm - Android java.security

Android examples for java.security:Hash

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Description

hash String by algorithm

Demo Code


//package com.java2s;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    public static final String md5(String input) {
        return hash(input, "MD5");
    }/*  ww  w .j a  v  a  2 s . com*/

    public static final String md5(File input) throws IOException {
        return hash(input, "MD5");
    }
    public static final String sha1(String input) {
        return hash(input, "SHA-1");
    }

    public static final String sha1(File input) throws IOException {
        return hash(input, "SHA-1");
    }

    public static final String hash(String input, String algorithm) {
        try {
            MessageDigest md = MessageDigest.getInstance(algorithm);
            byte[] messageDigest = md.digest(input.getBytes());
            return toHexString(messageDigest);
        } catch (NoSuchAlgorithmException e) {
            throw new IllegalArgumentException(e);
        }
    }

    public static final String hash(File file, String algorithm)
            throws IOException {
        try {
            MessageDigest md = MessageDigest.getInstance(algorithm);
            InputStream is = new FileInputStream(file);
            byte[] buffer = new byte[8192];
            int read = 0;
            while ((read = is.read(buffer)) > 0) {
                md.update(buffer, 0, read);
            }
            is.close();
            byte[] messageDigest = md.digest();
            return toHexString(messageDigest);
        } catch (NoSuchAlgorithmException e) {
            throw new IllegalArgumentException(e);
        }
    }

    private static String toHexString(byte[] bytes) {
        StringBuilder sb = new StringBuilder();
        for (byte b : bytes) {
            int unsignedB = b & 0xff;
            if (unsignedB < 0x10)
                sb.append("0");
            sb.append(Integer.toHexString(unsignedB));
        }
        return sb.toString();
    }
}

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