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package com.hyp.common.utils.sign;
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import org.apache.commons.codec.binary.Base64;
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import javax.crypto.Cipher;
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import java.security.*;
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import java.security.interfaces.RSAPrivateKey;
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import java.security.interfaces.RSAPublicKey;
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import java.security.spec.PKCS8EncodedKeySpec;
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import java.security.spec.X509EncodedKeySpec;
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/**
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 * packageName com.hyp.common.utils.sign
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 *
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 * @author wangxy
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 * @version JDK 8
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 * @className RsaUtils
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 * @date 2024/4/28
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 * @description RSA加密解密
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 */
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public class RsaUtils {
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    // Rsa 私钥
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    public static String privateKey = "MIIBVAIBADANBgkqhkiG9w0BAQEFAASCAT4wggE6AgEAAkEAqhHyZfSsYourNxaY"
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            + "7Nt+PrgrxkiA50efORdI5U5lsW79MmFnusUA355oaSXcLhu5xxB38SMSyP2KvuKN"
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            + "PuH3owIDAQABAkAfoiLyL+Z4lf4Myxk6xUDgLaWGximj20CUf+5BKKnlrK+Ed8gA"
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            + "kM0HqoTt2UZwA5E2MzS4EI2gjfQhz5X28uqxAiEA3wNFxfrCZlSZHb0gn2zDpWow"
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            + "cSxQAgiCstxGUoOqlW8CIQDDOerGKH5OmCJ4Z21v+F25WaHYPxCFMvwxpcw99Ecv"
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            + "DQIgIdhDTIqD2jfYjPTY8Jj3EDGPbH2HHuffvflECt3Ek60CIQCFRlCkHpi7hthh"
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            + "YhovyloRYsM+IS9h/0BzlEAuO0ktMQIgSPT3aFAgJYwKpqRYKlLDVcflZFCKY7u3"
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            + "UP8iWi1Qw0Y=";
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    /**
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     * 私钥解密
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     *
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     * @param text 待解密的文本
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     * @return 解密后的文本
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     */
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    public static String decryptByPrivateKey(String text) throws Exception
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    {
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        return decryptByPrivateKey(privateKey, text);
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    }
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    /**
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     * 公钥解密
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     *
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     * @param publicKeyString 公钥
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     * @param text 待解密的信息
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     * @return 解密后的文本
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     */
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    public static String decryptByPublicKey(String publicKeyString, String text) throws Exception
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    {
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        X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyString));
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        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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        PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
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        Cipher cipher = Cipher.getInstance("RSA");
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        cipher.init(Cipher.DECRYPT_MODE, publicKey);
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        byte[] result = cipher.doFinal(Base64.decodeBase64(text));
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        return new String(result);
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    }
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    /**
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     * 私钥加密
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     *
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     * @param privateKeyString 私钥
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     * @param text 待加密的信息
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     * @return 加密后的文本
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     */
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    public static String encryptByPrivateKey(String privateKeyString, String text) throws Exception
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    {
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        PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyString));
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        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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        PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
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        Cipher cipher = Cipher.getInstance("RSA");
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        cipher.init(Cipher.ENCRYPT_MODE, privateKey);
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        byte[] result = cipher.doFinal(text.getBytes());
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        return Base64.encodeBase64String(result);
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    }
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    /**
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     * 私钥解密
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     *
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     * @param privateKeyString 私钥
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     * @param text 待解密的文本
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     * @return 解密后的文本
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     */
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    public static String decryptByPrivateKey(String privateKeyString, String text) throws Exception
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    {
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        PKCS8EncodedKeySpec pkcs8EncodedKeySpec5 = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyString));
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        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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        PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec5);
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        Cipher cipher = Cipher.getInstance("RSA");
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        cipher.init(Cipher.DECRYPT_MODE, privateKey);
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        byte[] result = cipher.doFinal(Base64.decodeBase64(text));
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        return new String(result);
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    }
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    /**
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     * 公钥加密
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     *
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     * @param publicKeyString 公钥
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     * @param text 待加密的文本
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     * @return 加密后的文本
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     */
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    public static String encryptByPublicKey(String publicKeyString, String text) throws Exception
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    {
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        X509EncodedKeySpec x509EncodedKeySpec2 = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyString));
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        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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        PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec2);
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        Cipher cipher = Cipher.getInstance("RSA");
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        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
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        byte[] result = cipher.doFinal(text.getBytes());
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        return Base64.encodeBase64String(result);
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    }
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    /**
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     * 构建RSA密钥对
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     *
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     * @return 生成后的公私钥信息
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     */
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    public static RsaKeyPair generateKeyPair() throws NoSuchAlgorithmException
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    {
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        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
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        keyPairGenerator.initialize(1024);
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        KeyPair keyPair = keyPairGenerator.generateKeyPair();
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        RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
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        RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
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        String publicKeyString = Base64.encodeBase64String(rsaPublicKey.getEncoded());
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        String privateKeyString = Base64.encodeBase64String(rsaPrivateKey.getEncoded());
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        return new RsaKeyPair(publicKeyString, privateKeyString);
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    }
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    /**
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     * RSA密钥对对象
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     */
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    public static class RsaKeyPair
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    {
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        private final String publicKey;
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        private final String privateKey;
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        public RsaKeyPair(String publicKey, String privateKey)
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        {
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            this.publicKey = publicKey;
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            this.privateKey = privateKey;
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        }
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        public String getPublicKey()
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        {
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            return publicKey;
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        }
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        public String getPrivateKey()
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        {
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            return privateKey;
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        }
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    }
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}
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