/**
* @param s
* @return
*/
public static String mask(final String s) {
final StringBuffer buffer = new StringBuffer(25);
final int count = (s != null ? s.length() : 0);
for (int n = 0; n < count; n++) {
buffer.append('*');
}
return buffer.toString();
}
public static String getCryptUrl(String paramString) {
StringBuffer localStringBuffer = new StringBuffer(paramString);
if (paramString.indexOf("?") == -1) {
localStringBuffer.append("?");
} else {
localStringBuffer.append("&");
}
localStringBuffer.append("cyt=1");
return localStringBuffer.toString();
}
/**
* Method getDecodedBase64EncodedData
*
* @param element
* @return a byte array containing the decoded data
* @throws WSSecurityException
*/
public static byte[] getDecodedBase64EncodedData(Element element) throws WSSecurityException {
StringBuffer sb = new StringBuffer();
NodeList children = element.getChildNodes();
int iMax = children.getLength();
for (int i = 0; i < iMax; i++) {
Node curr = children.item(i);
if (curr.getNodeType() == Node.TEXT_NODE) {
sb.append(((Text) curr).getData());
}
}
String encodedData = sb.toString();
return Base64.decode(encodedData);
}
public static void main(String[] args) throws Exception {
//
// verifica args e recebe o texto plano
if (args.length != 1) {
System.err.println("Usage: java DigitalSignatureExample text");
System.exit(1);
}
byte[] plainText = args[0].getBytes("UTF8");
//
// gera o par de chaves RSA
System.out.println("\nStart generating RSA key");
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
keyGen.initialize(1024);
KeyPair key = keyGen.generateKeyPair();
System.out.println("Finish generating RSA key");
//
// define um objeto signature para utilizar MD5 e RSA
// e assina o texto plano com a chave privada,
// o provider utilizado tambem eh impresso
Signature sig = Signature.getInstance("MD5WithRSA");
sig.initSign(key.getPrivate());
sig.update(plainText);
byte[] signature = sig.sign();
System.out.println(sig.getProvider().getInfo());
System.out.println("\nSignature:");
// converte o signature para hexadecimal
StringBuffer buf = new StringBuffer();
for (int i = 0; i < signature.length; i++) {
String hex = Integer.toHexString(0x0100 + (signature[i] & 0x00FF)).substring(1);
buf.append((hex.length() < 2 ? "0" : "") + hex);
}
// imprime o signature em hexadecimal
System.out.println(buf.toString());
//
// verifica a assinatura com a chave publica
System.out.println("\nStart signature verification");
sig.initVerify(key.getPublic());
sig.update(plainText);
try {
if (sig.verify(signature)) {
System.out.println("Signature verified");
} else System.out.println("Signature failed");
} catch (SignatureException se) {
System.out.println("Singature failed");
}
}
/**
* 二进制字节流转十六进制字符串（每4位二进制换算得到1位16进制，该16进制用大写字符表示：0-F）
*
* @param bytes 要转化的二进制字节流
* @return 返回转化后的十六进制（字符表示，0-f）
*/
public static String bytes2HexString(byte[] bytes) {
StringBuffer buffer = new StringBuffer();
int digital;
for (int i = 0; i < bytes.length; i++) {
digital = bytes[i];
if (digital < 0) {
digital += 256;
}
if (digital < 16) {
buffer.append("0");
}
buffer.append(Integer.toHexString(digital));
}
return buffer.toString();
}
/**
* 将byte数组转换为表示16进制值的字符串， 如：byte[]{8,18}转换为：0813， 和public static byte[] hexStr2ByteArr(String
* strIn) 互为可逆的转换过程
*
* @param arrB 需要转换的byte数组
* @return 转换后的字符串
* @throws Exception 本方法不处理任何异常，所有异常全部抛出
*/
public static String byteArr2HexStr(byte[] arrB) {
int iLen = arrB.length;
// 每个byte用两个字符才能表示，所以字符串的长度是数组长度的两倍
StringBuffer sb = new StringBuffer(iLen * 2);
for (int i = 0; i < iLen; i++) {
int intTmp = arrB[i];
// 把负数转换为正数
while (intTmp < 0) {
intTmp = intTmp + 256;
}
// 小于0F的数需要在前面补0
if (intTmp < 16) {
sb.append("0");
}
sb.append(Integer.toString(intTmp, 16));
}
return sb.toString();
}
public String toString() {
String LINE_SEP = System.getProperty("line.separator");
StringBuffer strbuf =
new StringBuffer(
"SunJCE Diffie-Hellman Public Key:"
+ LINE_SEP
+ "y:"
+ LINE_SEP
+ Debug.toHexString(this.y)
+ LINE_SEP
+ "p:"
+ LINE_SEP
+ Debug.toHexString(this.p)
+ LINE_SEP
+ "g:"
+ LINE_SEP
+ Debug.toHexString(this.g));
if (this.l != 0) strbuf.append(LINE_SEP + "l:" + LINE_SEP + " " + this.l);
return strbuf.toString();
}
public static String SHA(String decript) {
try {
MessageDigest digest = MessageDigest.getInstance("SHA");
digest.update(decript.getBytes());
byte messageDigest[] = digest.digest();
// Create Hex String
StringBuffer hexString = new StringBuffer();
// 字节数组转换为 十六进制 数
for (int i = 0; i < messageDigest.length; i++) {
String shaHex = Integer.toHexString(messageDigest[i] & 0xFF);
if (shaHex.length() < 2) {
hexString.append(0);
}
hexString.append(shaHex);
}
return hexString.toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return "";
}
public static String MD5(String input) {
try {
// 获得MD5摘要算法的 MessageDigest 对象
MessageDigest mdInst = MessageDigest.getInstance("MD5");
// 使用指定的字节更新摘要
mdInst.update(input.getBytes());
// 获得密文
byte[] md = mdInst.digest();
// 把密文转换成十六进制的字符串形式
StringBuffer hexString = new StringBuffer();
// 字节数组转换为 十六进制 数
for (int i = 0; i < md.length; i++) {
String shaHex = Integer.toHexString(md[i] & 0xFF);
if (shaHex.length() < 2) {
hexString.append(0);
}
hexString.append(shaHex);
}
return hexString.toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return "";
}