import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.io.*;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.security.*;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Enumeration;
public class RSAUtil {
public static final String SIGN_ALGORITHMS = "SHA1WithRSA";
/**
* RSA最大加密明文大小
*/
private static final int MAX_ENCRYPT_BLOCK = 117;
/**
* RSA最大解密密文大小
*/
private static final int MAX_DECRYPT_BLOCK = 128;
public static String sign(String content, String input_charset, Key key)
throws UnsupportedEncodingException, Exception {
Cipher cipher;
try {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] output = cipher.doFinal(content.getBytes(input_charset));
return Base64.encode(output);
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此加密算法");
} catch (NoSuchPaddingException e) {
e.printStackTrace();
return null;
} catch (InvalidKeyException e) {
throw new Exception("加密公钥非法,请检查");
} catch (IllegalBlockSizeException e) {
throw new Exception("明文长度非法");
} catch (BadPaddingException e) {
throw new Exception("明文数据已损坏");
}
}
public static String readFile(String filePath, String charSet) throws Exception {
FileInputStream fileInputStream = new FileInputStream(filePath);
try {
FileChannel fileChannel = fileInputStream.getChannel();
ByteBuffer byteBuffer = ByteBuffer.allocate((int) fileChannel.size());
fileChannel.read(byteBuffer);
byteBuffer.flip();
return new String(byteBuffer.array(), charSet);
} finally {
fileInputStream.close();
}
}
public static String getKey(String string) throws Exception {
String content = readFile(string, "UTF8");
return content.replaceAll("\\-{5}[\\w\\s]+\\-{5}[\\r\\n|\\n]", "");
}
public static boolean verifyByKeyPath(String content, String sign, String publicKeyPath, String input_charset) {
try {
return verifyByPublicKey(content, sign, getKey(publicKeyPath), input_charset);
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
public static KeyInfo getPFXPrivateKey(String pfxPath, String password)
throws KeyStoreException, NoSuchAlgorithmException,
CertificateException, IOException, UnrecoverableKeyException {
FileInputStream fis = new FileInputStream(pfxPath);
KeyStore ks = KeyStore.getInstance("PKCS12");
ks.load(fis, password.toCharArray());
fis.close();
Enumeration<String> enumas = ks.aliases();
String keyAlias = null;
if (enumas.hasMoreElements())// we are readin just one certificate.
{
keyAlias = enumas.nextElement();
}
KeyInfo keyInfo = new KeyInfo();
PrivateKey prikey = (PrivateKey) ks.getKey(keyAlias, password.toCharArray());
Certificate cert = ks.getCertificate(keyAlias);
PublicKey pubkey = cert.getPublicKey();
keyInfo.privateKey = prikey;
keyInfo.publicKey = pubkey;
return keyInfo;
}
public static class KeyInfo {
PublicKey publicKey;
PrivateKey privateKey;
public PublicKey getPublicKey() {
return publicKey;
}
public PrivateKey getPrivateKey() {
return privateKey;
}
}
// =====================获取公钥私钥===============================//
//得到公钥
public static PublicKey getPublicKey(String key) throws Exception {
if (key == null) {
throw new Exception("加密公钥为空, 请设置");
}
byte[] buffer = Base64.decode(key);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
return keyFactory.generatePublic(keySpec);
}
/**
* 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 = buildPKCS8Key(key);
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
return privateKey;
}
/**
* 获取公钥
*
* @param filename
* @return
* @throws Exception
*/
public static PublicKey getPublicKeyFile(String filename) throws Exception {
File f = new File(filename);
FileInputStream fis = new FileInputStream(f);
DataInputStream dis = new DataInputStream(fis);
byte[] keyBytes = new byte[(int) f.length()];
dis.readFully(keyBytes);
dis.close();
X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes);
KeyFactory kf = KeyFactory.getInstance("RSA");
return kf.generatePublic(spec);
}
/**
* 获取私钥
*
* @param filename
* @return
* @throws Exception
*/
public static PrivateKey getPrivateKeyFile(String filename) throws Exception {
File f = new File(filename);
FileInputStream fis = new FileInputStream(f);
DataInputStream dis = new DataInputStream(fis);
byte[] keyBytes = new byte[(int) f.length()];
dis.readFully(keyBytes);
dis.close();
PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory kf = KeyFactory.getInstance("RSA");
return kf.generatePrivate(spec);
}
private static byte[] buildPKCS8Key(String privateKey) throws IOException {
if (privateKey.contains("-----BEGIN PRIVATE KEY-----")) {
return Base64.decode(privateKey.replaceAll("-----\\w+ PRIVATE KEY-----", ""));
} else if (privateKey.contains("-----BEGIN RSA PRIVATE KEY-----")) {
final byte[] innerKey = Base64.decode(privateKey.replaceAll("-----\\w+ RSA PRIVATE KEY-----", ""));
final byte[] result = new byte[innerKey.length + 26];
System.arraycopy(Base64.decode("MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKY="), 0, result, 0, 26);
System.arraycopy(BigInteger.valueOf(result.length - 4).toByteArray(), 0, result, 2, 2);
System.arraycopy(BigInteger.valueOf(innerKey.length).toByteArray(), 0, result, 24, 2);
System.arraycopy(innerKey, 0, result, 26, innerKey.length);
return result;
} else {
return Base64.decode(privateKey);
}
}
// ==========================秘钥加解密================================//
//私钥加密 调用方法
public static String signByPrivate(String content, String privateKey,
String input_charset) throws Exception {
if (privateKey == null) {
throw new Exception("加密私钥为空, 请设置");
}
PrivateKey privateKeyInfo = getPrivateKey(privateKey);
java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);
signature.initSign(privateKeyInfo);
signature.update(content.getBytes(input_charset));
return Base64.encode(signature.sign());
}
/**
* RSA验签名检查
*
* @param content 待签名数据
* @param sign 签名值
* @param publicKey 支付宝公钥
* @param input_charset 编码格式
* @return 布尔值
*///使用私钥加密 公钥解密验证 调用方法
public static boolean verifyByPublicKey(String content, String sign, String publicKey, String input_charset) {
try {
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
byte[] encodedKey = Base64.decode(publicKey);
PublicKey pubKey = keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey));
java.security.Signature signature = java.security.Signature
.getInstance(SIGN_ALGORITHMS);
signature.initVerify(pubKey);
signature.update(content.getBytes(input_charset));
boolean bverify = signature.verify(Base64.decode(sign));
return bverify;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
/**
* <P>
* 私钥解密
* </p>
*
* @param encryptedData 已加密数据
* @param privateKey 私钥(BASE64编码)
* @return
* @throws Exception
*/
public static String decryptByPrivateKey(String encryptedData, String privateKey) throws Exception {
byte[] encrypt = Base64.decode(encryptedData);//转换加密数据类型转换
PrivateKey privateK = getPrivateKey(privateKey);
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, privateK);
int inputLen = encrypt.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
cache = cipher.doFinal(encrypt, offSet, MAX_DECRYPT_BLOCK);
} else {
cache = cipher.doFinal(encrypt, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_DECRYPT_BLOCK;
}
byte[] decryptedData = out.toByteArray();
out.close();
return new String(decryptedData);
}
/**
* <p>
* 公钥加密
* </p>
*
* @param data 源数据
* @param publicKey 公钥(BASE64编码)
* @return
* @throws Exception
*/
public static String encryptByPublicKey(String data, String publicKey) throws Exception {
byte[] encryptDate = data.getBytes("UTF-8");
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, getPublicKey(publicKey));
int inputLen = encryptDate.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段加密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
cache = cipher.doFinal(encryptDate, offSet, MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(encryptDate, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_ENCRYPT_BLOCK;
}
byte[] encryptedData = out.toByteArray();
out.close();
return Base64.encode(encryptedData);
}
/**
* 公钥加密，私钥验证
* @param content 未加密的数据
* @param sign 加密后的数据
* @param privateKey 私钥
* @return
* @throws Exception
*/
public static boolean verifyByPrivateKey(String content, String sign, String privateKey) throws Exception {
String data = decryptByPrivateKey(sign, privateKey);
if (content.equals(data)) {
return true;
}
return false;
}
}
public class Base64
{
private static char[] base64EncodeChars = new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' };
private static byte[] base64DecodeChars = new byte[] { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55,
56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46,
47, 48, 49, 50, 51, -1, -1, -1, -1, -1 };
private Base64(){}
public static synchronized String encode(byte[] data)
{
int len = data.length;
int i = 0;
int b1, b2, b3;
StringBuilder sb = new StringBuilder(len);
while (i < len)
{
b1 = data[i++] & 0xff;
if (i == len)
{
sb.append(base64EncodeChars[b1 >>> 2]);
sb.append(base64EncodeChars[(b1 & 0x3) << 4]);
sb.append("==");
break;
}
b2 = data[i++] & 0xff;
if (i == len)
{
sb.append(base64EncodeChars[b1 >>> 2]);
sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);
sb.append(base64EncodeChars[(b2 & 0x0f) << 2]);
sb.append("=");
break;
}
b3 = data[i++] & 0xff;
sb.append(base64EncodeChars[b1 >>> 2]);
sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);
sb.append(base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >>> 6)]);
sb.append(base64EncodeChars[b3 & 0x3f]);
}
return sb.toString();
}
public static synchronized byte[] decode(String str)
{
byte[] data = str.getBytes();
int len = data.length;
ByteArrayOutputStream buf = new ByteArrayOutputStream(len);
int i = 0;
int b1, b2, b3, b4;
while (i < len)
{
/* b1 */
do
{
b1 = base64DecodeChars[data[i++]];
}
while (i < len && b1 == -1);
if (b1 == -1)
{
break;
}
/* b2 */
do
{
b2 = base64DecodeChars[data[i++]];
}
while (i < len && b2 == -1);
if (b2 == -1)
{
break;
}
buf.write((int) ((b1 << 2) | ((b2 & 0x30) >>> 4)));
/* b3 */
do
{
b3 = data[i++];
if (b3 == 61)
{
return buf.toByteArray();
}
b3 = base64DecodeChars[b3];
}
while (i < len && b3 == -1);
if (b3 == -1)
{
break;
}
buf.write((int) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));
/* b4 */
do
{
b4 = data[i++];
if (b4 == 61)
{
return buf.toByteArray();
}
b4 = base64DecodeChars[b4];
}
while (i < len && b4 == -1);
if (b4 == -1)
{
break;
}
buf.write((int) (((b3 & 0x03) << 6) | b4));
}
return buf.toByteArray();
}
}