Java使用OpenSSL生成的RSA公私鑰進行數據加解密

參考:https://www.cnblogs.com/yaowen/p/9226566.html
RSAEncrypt:

package com.zhx.base.interceptor;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;

import org.apache.commons.codec.binary.Base64;

public class RSAEncrypt {
    /**
     * 字節數據轉字符串專用集合
     */
    private static final char[] HEX_CHAR = { '0', '1', '2', '3', '4', '5', '6',
            '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
    
    /**
     * 隨機生成密鑰對
     */
    public static void genKeyPair(String filePath) {
        // KeyPairGenerator類用於生成公鑰和私鑰對,基於RSA算法生成對象
        KeyPairGenerator keyPairGen = null;
        try {
            keyPairGen = KeyPairGenerator.getInstance("RSA");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        // 初始化密鑰對生成器,密鑰大小爲96-1024位
        keyPairGen.initialize(1024,new SecureRandom());
        // 生成一個密鑰對,保存在keyPair中
        KeyPair keyPair = keyPairGen.generateKeyPair();
        // 得到私鑰
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
        // 得到公鑰
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
        try {
            // 得到公鑰字符串
            Base64 base64 = new Base64();
            String publicKeyString = new String(base64.encode(publicKey.getEncoded()));
            // 得到私鑰字符串
            String privateKeyString = new String(base64.encode(privateKey.getEncoded()));
            // 將密鑰對寫入到文件
            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();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    /**
     * 從文件中輸入流中加載公鑰
     *
     * @param in
     *            公鑰輸入流
     * @throws Exception
     *             加載公鑰時產生的異常
     */
    public static String loadPublicKeyByFile(String path) throws Exception {
        try {
            BufferedReader br = new BufferedReader(new FileReader(path
                    + "/publicKey.keystore"));
            String readLine = null;
            StringBuilder sb = new StringBuilder();
            while ((readLine = br.readLine()) != null) {
                sb.append(readLine);
            }
            br.close();
            return sb.toString();
        } catch (IOException e) {
            throw new Exception("公鑰數據流讀取錯誤");
        } catch (NullPointerException e) {
            throw new Exception("公鑰輸入流爲空");
        }
    }
    
    /**
     * 從字符串中加載公鑰
     *
     * @param publicKeyStr
     *            公鑰數據字符串
     * @throws Exception
     *             加載公鑰時產生的異常
     */
    public static RSAPublicKey loadPublicKeyByStr(String publicKeyStr)
            throws Exception {
        try {
            Base64 base64 = new Base64();
            byte[] buffer = base64.decode(publicKeyStr);
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
            return (RSAPublicKey) keyFactory.generatePublic(keySpec);
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("無此算法");
        } catch (InvalidKeySpecException e) {
            throw new Exception("公鑰非法");
        } catch (NullPointerException e) {
            throw new Exception("公鑰數據爲空");
        }
    }
    
    /**
     * 從文件中加載私鑰
     *
     * @param keyFileName
     *            私鑰文件名
     * @return 是否成功
     * @throws Exception
     */
    public static String loadPrivateKeyByFile(String path) throws Exception {
        try {
            BufferedReader br = new BufferedReader(new FileReader(path
                    + "/privateKey.keystore"));
            String readLine = null;
            StringBuilder sb = new StringBuilder();
            while ((readLine = br.readLine()) != null) {
                sb.append(readLine);
            }
            br.close();
            return sb.toString();
        } catch (IOException e) {
            throw new Exception("私鑰數據讀取錯誤");
        } catch (NullPointerException e) {
            throw new Exception("私鑰輸入流爲空");
        }
    }
    
    public static RSAPrivateKey loadPrivateKeyByStr(String privateKeyStr)
            throws Exception {
        try {
            Base64 base64 = new Base64();
            byte[] buffer = base64.decode(privateKeyStr);
            PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer);
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("無此算法");
        } catch (InvalidKeySpecException e) {
            throw new Exception("私鑰非法");
        } catch (NullPointerException e) {
            throw new Exception("私鑰數據爲空");
        }
    }
    
    /**
     * 公鑰加密過程
     *
     * @param publicKey
     *            公鑰
     * @param plainTextData
     *            明文數據
     * @return
     * @throws Exception
     *             加密過程中的異常信息
     */
    public static byte[] encrypt(RSAPublicKey publicKey, byte[] plainTextData)
            throws Exception {
        if (publicKey == null) {
            throw new Exception("加密公鑰爲空, 請設置");
        }
        Cipher cipher = null;
        try {
            // 使用默認RSA
            cipher = Cipher.getInstance("RSA");
            // cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());
            cipher.init(Cipher.ENCRYPT_MODE, publicKey);
            byte[] output = cipher.doFinal(plainTextData);
            return output;
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("無此加密算法");
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
            return null;
        } catch (InvalidKeyException e) {
            throw new Exception("加密公鑰非法,請檢查");
        } catch (IllegalBlockSizeException e) {
            throw new Exception("明文長度非法");
        } catch (BadPaddingException e) {
            throw new Exception("明文數據已損壞");
        }
    }
    
    /**
     * 私鑰加密過程
     *
     * @param privateKey
     *            私鑰
     * @param plainTextData
     *            明文數據
     * @return
     * @throws Exception
     *             加密過程中的異常信息
     */
    public static byte[] encrypt(RSAPrivateKey privateKey, byte[] plainTextData)
            throws Exception {
        if (privateKey == null) {
            throw new Exception("加密私鑰爲空, 請設置");
        }
        Cipher cipher = null;
        try {
            // 使用默認RSA
            cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.ENCRYPT_MODE, privateKey);
            byte[] output = cipher.doFinal(plainTextData);
            return output;
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("無此加密算法");
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
            return null;
        } catch (InvalidKeyException e) {
            throw new Exception("加密私鑰非法,請檢查");
        } catch (IllegalBlockSizeException e) {
            throw new Exception("明文長度非法");
        } catch (BadPaddingException e) {
            throw new Exception("明文數據已損壞");
        }
    }
    
    /**
     * 私鑰解密過程
     *
     * @param privateKey
     *            私鑰
     * @param cipherData
     *            密文數據
     * @return 明文
     * @throws Exception
     *             解密過程中的異常信息
     */
    public static byte[] decrypt(RSAPrivateKey privateKey, byte[] cipherData)
            throws Exception {
        if (privateKey == null) {
            throw new Exception("解密私鑰爲空, 請設置");
        }
        Cipher cipher = null;
        try {
            // 使用默認RSA
            cipher = Cipher.getInstance("RSA");
            // cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());
            cipher.init(Cipher.DECRYPT_MODE, privateKey);
            byte[] output = cipher.doFinal(cipherData);
            return output;
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("無此解密算法");
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
            return null;
        } catch (InvalidKeyException e) {
            throw new Exception("解密私鑰非法,請檢查");
        } catch (IllegalBlockSizeException e) {
            throw new Exception("密文長度非法");
        } catch (BadPaddingException e) {
            throw new Exception("密文數據已損壞");
        }
    }
    
    /**
     * 公鑰解密過程
     *
     * @param publicKey
     *            公鑰
     * @param cipherData
     *            密文數據
     * @return 明文
     * @throws Exception
     *             解密過程中的異常信息
     */
    public static byte[] decrypt(RSAPublicKey publicKey, byte[] cipherData)
            throws Exception {
        if (publicKey == null) {
            throw new Exception("解密公鑰爲空, 請設置");
        }
        Cipher cipher = null;
        try {
            // 使用默認RSA
            cipher = Cipher.getInstance("RSA");
            // cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());
            cipher.init(Cipher.DECRYPT_MODE, publicKey);
            byte[] output = cipher.doFinal(cipherData);
            return output;
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("無此解密算法");
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
            return null;
        } catch (InvalidKeyException e) {
            throw new Exception("解密公鑰非法,請檢查");
        } catch (IllegalBlockSizeException e) {
            throw new Exception("密文長度非法");
        } catch (BadPaddingException e) {
            throw new Exception("密文數據已損壞");
        }
    }
    
    /**
     * 字節數據轉十六進制字符串
     *
     * @param data
     *            輸入數據
     * @return 十六進制內容
     */
    public static String byteArrayToString(byte[] data) {
        StringBuilder stringBuilder = new StringBuilder();
        for (int i = 0; i < data.length; i++) {
            // 取出字節的高四位 作爲索引得到相應的十六進制標識符 注意無符號右移
            stringBuilder.append(HEX_CHAR[(data[i] & 0xf0) >>> 4]);
            // 取出字節的低四位 作爲索引得到相應的十六進制標識符
            stringBuilder.append(HEX_CHAR[(data[i] & 0x0f)]);
            if (i < data.length - 1) {
                stringBuilder.append(' ');
            }
        }
        return stringBuilder.toString();
    }
}

RSASignature:

package com.zhx.base.interceptor;

import org.apache.commons.codec.binary.Base64;

import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

/**
 * RSA簽名驗籤類
 */
public class RSASignature {
    /**
     * 簽名算法
     */
    public static final String SIGN_ALGORITHMS = "SHA1WithRSA";
    
    /**
     * RSA簽名
     *
     * @param content    待簽名數據
     * @param privateKey 商戶私鑰
     * @param encode     字符集編碼
     * @return 簽名值
     */
    public static String sign(String content, String privateKey, String encode) {
        try {
            Base64 base64 = new Base64();
            PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(base64.decode(privateKey));
            KeyFactory keyf = KeyFactory.getInstance("RSA");
            PrivateKey priKey = keyf.generatePrivate(priPKCS8);
            java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);
            signature.initSign(priKey);
            signature.update(content.getBytes(encode));
            byte[] signed = signature.sign();
            return new String(base64.encode(signed));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    
    public static String sign(String content, String privateKey) {
        try {
            Base64 base64 = new Base64();
            PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(base64.decode(privateKey));
            KeyFactory keyf = KeyFactory.getInstance("RSA");
            PrivateKey priKey = keyf.generatePrivate(priPKCS8);
            java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);
            signature.initSign(priKey);
            signature.update(content.getBytes());
            byte[] signed = signature.sign();
            return new String(base64.encode(signed));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    
    /**
     * RSA驗簽名檢查
     *
     * @param content   待簽名數據
     * @param sign      簽名值
     * @param publicKey 分配給開發商公鑰
     * @param encode    字符集編碼
     * @return 布爾值
     */
    public static boolean doCheck(String content, String sign, String publicKey, String encode) {
        try {
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            Base64 base64 = new Base64();
            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(encode));
            boolean bverify = signature.verify(base64.decode(sign));
            return bverify;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }
    
    public static boolean doCheck(String content, String sign, String publicKey) {
        try {
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            Base64 base64 = new Base64();
            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());
            boolean bverify = signature.verify(base64.decode(sign));
            return bverify;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }
}

MainTest:

package com.zhx.base.interceptor;

import org.apache.commons.codec.binary.Base64;

public class MainTest {
    
    public static void main(String[] args) throws Exception {
        String filepath = "C:\\Users\\admin\\Desktop\\test";
        
         RSAEncrypt.genKeyPair(filepath);
        
        Base64 base64 = new Base64();
        
        System.out.println("--------------公鑰加密私鑰解密過程-------------------");
        String plainText = "ihep_公鑰加密私鑰解密";
        // 公鑰加密過程
        byte[] cipherData = RSAEncrypt.encrypt(RSAEncrypt.loadPublicKeyByStr(RSAEncrypt.loadPublicKeyByFile(filepath)),
                plainText.getBytes());
        String cipher = new String(base64.encode(cipherData));
        // 私鑰解密過程
        byte[] res = RSAEncrypt.decrypt(RSAEncrypt.loadPrivateKeyByStr(RSAEncrypt.loadPrivateKeyByFile(filepath)),
                base64.decode(cipher));
        String restr = new String(res);
        System.out.println("原文:" + plainText);
        System.out.println("加密:" + cipher);
        System.out.println("解密:" + restr);
        System.out.println();
        
        System.out.println("--------------私鑰加密公鑰解密過程-------------------");
        plainText = "ihep_私鑰加密公鑰解密";
        // 私鑰加密過程
        cipherData = RSAEncrypt.encrypt(RSAEncrypt.loadPrivateKeyByStr(RSAEncrypt.loadPrivateKeyByFile(filepath)),
                plainText.getBytes());
        cipher = new String(base64.encode(cipherData));
        // 公鑰解密過程
        res = RSAEncrypt.decrypt(RSAEncrypt.loadPublicKeyByStr(RSAEncrypt.loadPublicKeyByFile(filepath)),
                base64.decode(cipher));
        restr = new String(res);
        System.out.println("原文:" + plainText);
        System.out.println("加密:" + cipher);
        System.out.println("解密:" + restr);
        System.out.println();
        
        System.out.println("---------------私鑰簽名過程------------------");
        String content = "ihep_這是用於簽名的原始數據";
        String signstr = RSASignature.sign(content, RSAEncrypt.loadPrivateKeyByFile(filepath));
        System.out.println("簽名原串:" + content);
        System.out.println("簽名串:" + signstr);
        System.out.println();
        
        System.out.println("---------------公鑰校驗簽名------------------");
        System.out.println("簽名原串:" + content);
        System.out.println("簽名串:" + signstr);
        
        System.out.println("驗簽結果:" + RSASignature.doCheck(content, signstr, RSAEncrypt.loadPublicKeyByFile(filepath)));
        System.out.println();
        
    }
}
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