加密工具类 - CryptoUtils.java

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.util.zip.CRC32;
import java.util.zip.CheckedInputStream;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.io.IOUtils;

/**
* 加密工具类，包含MD5,BASE64,SHA,CRC32
*
*/
public class CryptoUtils {

private static final String DEFAULT_CHARSET = "UTF-8";

/**
* MD5加密
*
* @param bytes
*            an array of byte.
* @return a {@link java.lang.String} object.
*/
public static String encodeMD5(final byte[] bytes) {
return DigestUtils.md5Hex(bytes);
}

/**
* MD5加密，默认UTF-8
*
* @param str
*            a {@link java.lang.String} object.
* @return a {@link java.lang.String} object.
*/
public static String encodeMD5(final String str) {
return encodeMD5(str, DEFAULT_CHARSET);
}

/**
* MD5加密
*
* @param str
*            a {@link java.lang.String} object.
* @param charset
*            a {@link java.lang.String} object.
* @return a {@link java.lang.String} object.
*/
public static String encodeMD5(final String str, final String charset) {
if (str == null) {
return null;
}
try {
byte[] bytes = str.getBytes(charset);
return encodeMD5(bytes);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}

/**
* SHA加密
*
* @param bytes
*            an array of byte.
* @return a {@link java.lang.String} object.
*/
public static String encodeSHA(final byte[] bytes) {
return DigestUtils.sha512Hex(bytes);
}

/**
* SHA加密
*
* @param str
*            a {@link java.lang.String} object.
* @param charset
*            a {@link java.lang.String} object.
* @return a {@link java.lang.String} object.
*/
public static String encodeSHA(final String str, final String charset) {
if (str == null) {
return null;
}
try {
byte[] bytes = str.getBytes(charset);
return encodeSHA(bytes);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}

/**
* SHA加密,默认utf-8
*
* @param str
*            a {@link java.lang.String} object.
* @return a {@link java.lang.String} object.
*/
public static String encodeSHA(final String str) {
return encodeSHA(str, DEFAULT_CHARSET);
}

/**
* BASE64加密
*
* @param bytes
*            an array of byte.
* @return a {@link java.lang.String} object.
*/
public static String encodeBASE64(final byte[] bytes) {
return new String(Base64.encodeBase64String(bytes));
}

/**
* BASE64加密
*
* @param str
*            a {@link java.lang.String} object.
* @param charset
*            a {@link java.lang.String} object.
* @return a {@link java.lang.String} object.
*/
public static String encodeBASE64(final String str, String charset) {
if (str == null) {
return null;
}
try {
byte[] bytes = str.getBytes(charset);
return encodeBASE64(bytes);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}

/**
* BASE64加密,默认UTF-8
*
* @param str
*            a {@link java.lang.String} object.
* @return a {@link java.lang.String} object.
*/
public static String encodeBASE64(final String str) {
return encodeBASE64(str, DEFAULT_CHARSET);
}

/**
* BASE64解密,默认UTF-8
*
* @param str
*            a {@link java.lang.String} object.
* @return a {@link java.lang.String} object.
*/
public static String decodeBASE64(String str) {
return decodeBASE64(str, DEFAULT_CHARSET);
}

/**
* BASE64解密
*
* @param str
*            a {@link java.lang.String} object.
* @param charset
*            字符编码
* @return a {@link java.lang.String} object.
*/
public static String decodeBASE64(String str, String charset) {
try {
byte[] bytes = str.getBytes(charset);
return new String(Base64.decodeBase64(bytes));
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}

/**
* CRC32字节校验
*
* @param bytes
*            an array of byte.
* @return a {@link java.lang.String} object.
*/
public static String crc32(byte[] bytes) {
CRC32 crc32 = new CRC32();
crc32.update(bytes);
return Long.toHexString(crc32.getValue());
}

/**
* CRC32字符串校验
*
* @param str
*            a {@link java.lang.String} object.
* @param charset
*            a {@link java.lang.String} object.
* @return a {@link java.lang.String} object.
*/
public static String crc32(final String str, String charset) {
try {
byte[] bytes = str.getBytes(charset);
return crc32(bytes);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}

/**
* CRC32字符串校验,默认UTF-8编码读取
*
* @param str
*            a {@link java.lang.String} object.
* @return a {@link java.lang.String} object.
*/
public static String crc32(final String str) {
return crc32(str, DEFAULT_CHARSET);
}

/**
* CRC32流校验
*
* @param input
*            a {@link java.io.InputStream} object.
* @return a {@link java.lang.String} object.
*/
public static String crc32(InputStream input) {
CRC32 crc32 = new CRC32();
CheckedInputStream checkInputStream = null;
int test = 0;
try {
checkInputStream = new CheckedInputStream(input, crc32);
do {
test = checkInputStream.read();
} while (test != -1);
return Long.toHexString(crc32.getValue());
} catch (IOException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}

/**
* CRC32文件唯一校验
*
* @param file
*            a {@link java.io.File} object.
* @return a {@link java.lang.String} object.
*/
public static String crc32(File file) {
InputStream input = null;
try {
input = new BufferedInputStream(new FileInputStream(file));
return crc32(input);
} catch (FileNotFoundException e) {
e.printStackTrace();
throw new RuntimeException(e);
} finally {
IOUtils.closeQuietly(input);
}
}

/**
* CRC32文件唯一校验
*
* @param url
*            a {@link java.net.URL} object.
* @return a {@link java.lang.String} object.
*/
public static String crc32(URL url) {
InputStream input = null;
try {
input = url.openStream();
return crc32(input);
} catch (IOException e) {
e.printStackTrace();
throw new RuntimeException(e);
} finally {
IOUtils.closeQuietly(input);
}
}
}