2、Base64 问题 // 编码 String asB64 = new Base64().encodeToString("some string".getBytes("utf-8"))System.out.println(asB64)// 输出为: c29tZSBzdHJpbmc= 解码 // 解码 byte[] asBytes = new Base64().getDecoder().decode("c29tZSBzdHJpbmc=") System.out.println(new String(asBytes, "utf-8"))// 输出为: some string ...
下面是RSA加密代码。/**
* RSA算法，实现数据的加密解密。
* @author ShaoJiang
*
*/
public class RSAUtil {
private static Cipher cipher
static{
try {
cipher = Cipher.getInstance("RSA")
} catch (NoSuchAlgorithmException e) {
e.printStackTrace()
} catch (NoSuchPaddingException e) {
e.printStackTrace()
}
}
/**
* 生成密钥对
* @param filePath 生成密钥的路径
* @return
*/
public static Map<String,String>generateKeyPair(String filePath){
try {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA")
// 密钥位数
keyPairGen.initialize(1024)
// 密钥对
KeyPair keyPair = keyPairGen.generateKeyPair()
// 公钥
PublicKey publicKey = (RSAPublicKey) keyPair.getPublic()
// 私钥
PrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate()
//得到公钥字符串
String publicKeyString = getKeyString(publicKey)
//得到私钥字符串
String privateKeyString = getKeyString(privateKey)
FileWriter pubfw = new FileWriter(filePath+"/publicKey.keystore")
FileWriter prifw = new FileWriter(filePath+"/privateKey.keystore")
BufferedWriter pubbw = new BufferedWriter(pubfw)
BufferedWriter pribw = new BufferedWriter(prifw)
pubbw.write(publicKeyString)
pribw.write(privateKeyString)
pubbw.flush()
pubbw.close()
pubfw.close()
pribw.flush()
pribw.close()
prifw.close()
//将生成的密钥对返回
Map<String,String>map = new HashMap<String,String>()
map.put("publicKey",publicKeyString)
map.put("privateKey",privateKeyString)
return map
} catch (Exception e) {
e.printStackTrace()
}
return null
}
/**
* 得到公钥
*
* @param key
*密钥字符串（经过base64编码）
* @throws Exception
*/
public static PublicKey getPublicKey(String key) throws Exception {
byte[] keyBytes
keyBytes = (new BASE64Decoder()).decodeBuffer(key)
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes)
KeyFactory keyFactory = KeyFactory.getInstance("RSA")
PublicKey publicKey = keyFactory.generatePublic(keySpec)
return publicKey
}
/**
* 得到私钥
*
* @param key
*密钥字符串（经过base64编码）
* @throws Exception
*/
public static PrivateKey getPrivateKey(String key) throws Exception {
byte[] keyBytes
keyBytes = (new BASE64Decoder()).decodeBuffer(key)
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes)
KeyFactory keyFactory = KeyFactory.getInstance("RSA")
PrivateKey privateKey = keyFactory.generatePrivate(keySpec)
return privateKey
}
/**
* 得到密钥字符串（经过base64编码）
*
* @return
*/
public static String getKeyString(Key key) throws Exception {
byte[] keyBytes = key.getEncoded()
String s = (new BASE64Encoder()).encode(keyBytes)
return s
}
/**
* 使用公钥对明文进行加密，返回BASE64编码的字符串
* @param publicKey
* @param plainText
* @return
*/
public static String encrypt(PublicKey publicKey,String plainText){
try {
cipher.init(Cipher.ENCRYPT_MODE, publicKey)
byte[] enBytes = cipher.doFinal(plainText.getBytes())
return (new BASE64Encoder()).encode(enBytes)
} catch (InvalidKeyException e) {
e.printStackTrace()
} catch (IllegalBlockSizeException e) {
e.printStackTrace()
} catch (BadPaddingException e) {
e.printStackTrace()
}
return null
}
/**
* 使用keystore对明文进行加密
* @param publicKeystore 公钥文件路径
* @param plainText 明文
* @return
*/
public static String encrypt(String publicKeystore,String plainText){
try {
FileReader fr = new FileReader(publicKeystore)
BufferedReader br = new BufferedReader(fr)
String publicKeyString=""
String str
while((str=br.readLine())!=null){
publicKeyString+=str
}
br.close()
fr.close()
cipher.init(Cipher.ENCRYPT_MODE,getPublicKey(publicKeyString))
byte[] enBytes = cipher.doFinal(plainText.getBytes())
return (new BASE64Encoder()).encode(enBytes)
} catch (InvalidKeyException e) {
e.printStackTrace()
} catch (IllegalBlockSizeException e) {
e.printStackTrace()
} catch (BadPaddingException e) {
e.printStackTrace()
} catch (Exception e) {
e.printStackTrace()
}
return null
}
/**
* 使用私钥对明文密文进行解密
* @param privateKey
* @param enStr
* @return
*/
public static String decrypt(PrivateKey privateKey,String enStr){
try {
cipher.init(Cipher.DECRYPT_MODE, privateKey)
byte[] deBytes = cipher.doFinal((new BASE64Decoder()).decodeBuffer(enStr))
return new String(deBytes)
} catch (InvalidKeyException e) {
e.printStackTrace()
} catch (IllegalBlockSizeException e) {
e.printStackTrace()
} catch (BadPaddingException e) {
e.printStackTrace()
} catch (IOException e) {
e.printStackTrace()
}
return null
}
/**
* 使用keystore对密文进行解密
* @param privateKeystore 私钥路径
* @param enStr 密文
* @return
*/
public static String decrypt(String privateKeystore,String enStr){
try {
FileReader fr = new FileReader(privateKeystore)
BufferedReader br = new BufferedReader(fr)
String privateKeyString=""
String str
while((str=br.readLine())!=null){
privateKeyString+=str
}
br.close()
fr.close()
cipher.init(Cipher.DECRYPT_MODE, getPrivateKey(privateKeyString))
byte[] deBytes = cipher.doFinal((new BASE64Decoder()).decodeBuffer(enStr))
return new String(deBytes)
} catch (InvalidKeyException e) {
e.printStackTrace()
} catch (IllegalBlockSizeException e) {
e.printStackTrace()
} catch (BadPaddingException e) {
e.printStackTrace()
} catch (IOException e) {
e.printStackTrace()
} catch (Exception e) {
e.printStackTrace()
}
return null
}
}
