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package org.macrocloud.kernel.toolkit.utils;

import org.springframework.lang.Nullable;
import org.springframework.util.Base64Utils;

import org.macrocloud.kernel.toolkit.tuple.KeyPair;
import javax.crypto.Cipher;
import java.math.BigInteger;
import java.security.*;
import java.security.spec.*;
import java.util.Objects;


/**
 * RSA加、解密工具
 *
 * 

* 1. 公钥负责加密,私钥负责解密; * 2. 私钥负责签名,公钥负责验证。 *

* * @author macro */ public class RsaUtil { /** 数字签名,密钥算法. */ public static final String RSA_ALGORITHM = "RSA"; /** The Constant RSA_PADDING. */ public static final String RSA_PADDING = "RSA/ECB/PKCS1Padding"; /** * 获取 KeyPair. * * @return KeyPair */ public static KeyPair genKeyPair() { return genKeyPair(1024); } /** * 获取 KeyPair. * * @param keySize key size * @return KeyPair */ public static KeyPair genKeyPair(int keySize) { try { KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(RSA_ALGORITHM); // 密钥位数 keyPairGen.initialize(keySize); // 密钥对 return new KeyPair(keyPairGen.generateKeyPair()); } catch (NoSuchAlgorithmException e) { throw Exceptions.unchecked(e); } } /** * 生成RSA私钥. * * @param modulus N特征值 * @param exponent d特征值 * @return {@link PrivateKey} */ public static PrivateKey generatePrivateKey(String modulus, String exponent) { return generatePrivateKey(new BigInteger(modulus), new BigInteger(exponent)); } /** * 生成RSA私钥. * * @param modulus N特征值 * @param exponent d特征值 * @return {@link PrivateKey} */ public static PrivateKey generatePrivateKey(BigInteger modulus, BigInteger exponent) { RSAPrivateKeySpec keySpec = new RSAPrivateKeySpec(modulus, exponent); try { KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM); return keyFactory.generatePrivate(keySpec); } catch (NoSuchAlgorithmException | InvalidKeySpecException e) { throw Exceptions.unchecked(e); } } /** * 生成RSA公钥. * * @param modulus N特征值 * @param exponent e特征值 * @return {@link PublicKey} */ public static PublicKey generatePublicKey(String modulus, String exponent) { return generatePublicKey(new BigInteger(modulus), new BigInteger(exponent)); } /** * 生成RSA公钥. * * @param modulus N特征值 * @param exponent e特征值 * @return {@link PublicKey} */ public static PublicKey generatePublicKey(BigInteger modulus, BigInteger exponent) { RSAPublicKeySpec keySpec = new RSAPublicKeySpec(modulus, exponent); try { KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM); return keyFactory.generatePublic(keySpec); } catch (NoSuchAlgorithmException | InvalidKeySpecException e) { throw Exceptions.unchecked(e); } } /** * 得到公钥. * * @param base64PubKey 密钥字符串(经过base64编码) * @return PublicKey */ public static PublicKey getPublicKey(String base64PubKey) { Objects.requireNonNull(base64PubKey, "base64 public key is null."); byte[] keyBytes = Base64Utils.decodeFromString(base64PubKey); X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes); try { KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM); return keyFactory.generatePublic(keySpec); } catch (NoSuchAlgorithmException | InvalidKeySpecException e) { throw Exceptions.unchecked(e); } } /** * 得到公钥字符串. * * @param base64PubKey 密钥字符串(经过base64编码) * @return PublicKey String */ public static String getPublicKeyToBase64(String base64PubKey) { PublicKey publicKey = getPublicKey(base64PubKey); return getKeyString(publicKey); } /** * 得到私钥. * * @param base64PriKey 密钥字符串(经过base64编码) * @return PrivateKey */ public static PrivateKey getPrivateKey(String base64PriKey) { Objects.requireNonNull(base64PriKey, "base64 private key is null."); byte[] keyBytes = Base64Utils.decodeFromString(base64PriKey); PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes); try { KeyFactory keyFactory = KeyFactory.getInstance(RSA_ALGORITHM); return keyFactory.generatePrivate(keySpec); } catch (NoSuchAlgorithmException | InvalidKeySpecException e) { throw Exceptions.unchecked(e); } } /** * 得到密钥字符串(经过base64编码). * * @param key key * @return base 64 编码后的 key */ public static String getKeyString(Key key) { return Base64Utils.encodeToString(key.getEncoded()); } /** * 得到私钥 base64. * * @param base64PriKey 密钥字符串(经过base64编码) * @return PrivateKey String */ public static String getPrivateKeyToBase64(String base64PriKey) { PrivateKey privateKey = getPrivateKey(base64PriKey); return getKeyString(privateKey); } /** * 共要加密. * * @param base64PublicKey base64 的公钥 * @param data 待加密的内容 * @return 加密后的内容 */ public static byte[] encrypt(String base64PublicKey, byte[] data) { return encrypt(getPublicKey(base64PublicKey), data); } /** * 共要加密. * * @param publicKey 公钥 * @param data 待加密的内容 * @return 加密后的内容 */ public static byte[] encrypt(PublicKey publicKey, byte[] data) { return rsa(publicKey, data, Cipher.ENCRYPT_MODE); } /** * 私钥加密,用于 qpp 内,公钥解密. * * @param base64PrivateKey base64 的私钥 * @param data 待加密的内容 * @return 加密后的内容 */ public static byte[] encryptByPrivateKey(String base64PrivateKey, byte[] data) { return encryptByPrivateKey(getPrivateKey(base64PrivateKey), data); } /** * 私钥加密,加密成 base64 字符串,用于 qpp 内,公钥解密. * * @param base64PrivateKey base64 的私钥 * @param data 待加密的内容 * @return 加密后的内容 */ public static String encryptByPrivateKeyToBase64(String base64PrivateKey, byte[] data) { return Base64Util.encodeToString(encryptByPrivateKey(base64PrivateKey, data)); } /** * 私钥加密,用于 qpp 内,公钥解密. * * @param privateKey 私钥 * @param data 待加密的内容 * @return 加密后的内容 */ public static byte[] encryptByPrivateKey(PrivateKey privateKey, byte[] data) { return rsa(privateKey, data, Cipher.ENCRYPT_MODE); } /** * 公钥加密. * * @param base64PublicKey base64 公钥 * @param data 待加密的内容 * @return 加密后的内容 */ @Nullable public static String encryptToBase64(String base64PublicKey, @Nullable String data) { if (StringUtil.isBlank(data)) { return null; } return Base64Utils.encodeToString(encrypt(base64PublicKey, data.getBytes(Charsets.UTF_8))); } /** * 解密. * * @param base64PrivateKey base64 私钥 * @param data 数据 * @return 解密后的数据 */ public static byte[] decrypt(String base64PrivateKey, byte[] data) { return decrypt(getPrivateKey(base64PrivateKey), data); } /** * 解密. * * @param base64publicKey base64 公钥 * @param data 数据 * @return 解密后的数据 */ public static byte[] decryptByPublicKey(String base64publicKey, byte[] data) { return decryptByPublicKey(getPublicKey(base64publicKey), data); } /** * 解密. * * @param privateKey privateKey * @param data 数据 * @return 解密后的数据 */ public static byte[] decrypt(PrivateKey privateKey, byte[] data) { return rsa(privateKey, data, Cipher.DECRYPT_MODE); } /** * 解密. * * @param publicKey PublicKey * @param data 数据 * @return 解密后的数据 */ public static byte[] decryptByPublicKey(PublicKey publicKey, byte[] data) { return rsa(publicKey, data, Cipher.DECRYPT_MODE); } /** * rsa 加、解密. * * @param key key * @param data 数据 * @param mode 模式 * @return 解密后的数据 */ private static byte[] rsa(Key key, byte[] data, int mode) { try { Cipher cipher = Cipher.getInstance(RSA_PADDING); cipher.init(mode, key); return cipher.doFinal(data); } catch (Exception e) { throw Exceptions.unchecked(e); } } /** * base64 数据解密. * * @param base64PublicKey base64 公钥 * @param base64Data base64数据 * @return 解密后的数据 */ public static byte[] decryptByPublicKeyFromBase64(String base64PublicKey, byte[] base64Data) { return decryptByPublicKey(getPublicKey(base64PublicKey), base64Data); } /** * base64 数据解密. * * @param base64PrivateKey base64 私钥 * @param base64Data base64数据 * @return 解密后的数据 */ @Nullable public static String decryptFromBase64(String base64PrivateKey, @Nullable String base64Data) { if (StringUtil.isBlank(base64Data)) { return null; } return new String(decrypt(base64PrivateKey, Base64Utils.decodeFromString(base64Data)), Charsets.UTF_8); } /** * base64 数据解密. * * @param base64PrivateKey base64 私钥 * @param base64Data base64数据 * @return 解密后的数据 */ public static byte[] decryptFromBase64(String base64PrivateKey, byte[] base64Data) { return decrypt(base64PrivateKey, Base64Utils.decode(base64Data)); } /** * base64 数据解密. * * @param base64PublicKey base64 公钥 * @param base64Data base64数据 * @return 解密后的数据 */ @Nullable public static String decryptByPublicKeyFromBase64(String base64PublicKey, @Nullable String base64Data) { if (StringUtil.isBlank(base64Data)) { return null; } return new String(decryptByPublicKeyFromBase64(base64PublicKey, Base64Utils.decodeFromString(base64Data)), Charsets.UTF_8); } }




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