Java 加密解密工具类

RSA非对称加密

package com.chitic.supplywater.common.service;


import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Arrays;

import javax.crypto.Cipher;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

@SuppressWarnings("restriction")
public class RSACoder {
    private static final Logger logger = LoggerFactory.getLogger(RSACoder.class);

    /**
     * 加密方式
     */
    public static final String KEY_ALGORITHM = "RSA";
    /**
     * 签名方式
     */
    public static final String KEY_SIGN = "SHA1withRSA";
    /**
     * RSA最大加密明文大小
     */
    public static final int MAX_ENCRYPT_BLOCK = 117;

    /**
     * RSA最大解密密文大小
     */
    public static final int MAX_DECRYPT_BLOCK = 128;

    /**
     * RSA最大解密密文大小
     */
    public static final int MAX_DECRYPT_BLOCK_256 = 256;

    /*
     * static { KeyPairGenerator keyPairGen = null; try { keyPairGen =
     * KeyPairGenerator.getInstance(KEY_ALGORITHM); } catch
     * (NoSuchAlgorithmException e) { logger.error("创建密钥失败", e); }
     * keyPairGen.initialize(1024);
     *
     * KeyPair keyPair = keyPairGen.generateKeyPair(); // 公钥 RSAPublicKey
     * publicKey = (RSAPublicKey) keyPair.getPublic(); PUBLIC_KEY =
     * encryptBASE64(publicKey.getEncoded()); // 私钥 RSAPrivateKey privateKey =
     * (RSAPrivateKey) keyPair.getPrivate(); PRIVATE_KEY =
     * encryptBASE64(privateKey.getEncoded()); }
     */

    public static void main(String[] args) {
        KeyPairGenerator keyPairGen = null;
        try {
            keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
        } catch (NoSuchAlgorithmException e) {
        }
        keyPairGen.initialize(1024);

        KeyPair keyPair = keyPairGen.generateKeyPair();
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
        System.out.println(RSACoder.encryptBASE64(publicKey.getEncoded()));
        System.out.println("-----------------------------");
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
        System.out.println(RSACoder.encryptBASE64(privateKey.getEncoded()));
        String pubKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCPEaBoSSdHgK32dsM4H407pOmqSliYz6qh1m5i2ZHY1rF+0ze2VAXf4d+XU4kk2L5L1itHIdxMzMoxHI+F4ZGaeETQLluDJlRpcJL+ZTjEAI6CBNtmGFCTd1QB3AHco1txch04PzMpcjLIa6WzHrI65/bF0kCmo2mQNHLQ+W5hvwIDAQAB";
        String priKey = "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";
        try {
            String jiami = RSACoder.encryptByPublicKey(pubKey, URLEncoder.encode("{"sDate":"20160101","eDate":"20181201"}", "UTF-8"));
//      String params = RSACoder.encryptByPublicKey(pubKey,URLEncoder.encode("{"contractNo":"4号"}", "UTF-8"));
//      String params = RSACoder.encryptByPublicKey(pubKey,URLEncoder.encode("{"projName":"新密"}", "UTF-8"));
            System.out.println("加密后的密文:" + jiami);
            String jiemi = URLDecoder.decode(RSACoder.decryptByPrivateKey(priKey, jiami), "utf-8");
            System.out.println("解密加密后的密文:" + jiemi);
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

    /**
     * 公钥加密
     *
     * @param pubKey
     * @param data
     * @return
     */
    public static String encryptByPublicKey(String pubKey, String data) {
        try {
            return encryptBASE64(encryptByPublicKey(pubKey, data.getBytes("utf-8")));
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("加密失败", e);
        }
    }

    /**
     * 公钥加密
     *
     * @param pubKey
     * @param data
     * @return
     */
    public static byte[] encryptByPublicKey(String pubKey, byte[] data) {
        try {
            byte[] keyBytes = decryptBASE64(pubKey);
            X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
            KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
            Key key = keyFactory.generatePublic(x509KeySpec);

            Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
            cipher.init(Cipher.ENCRYPT_MODE, key);

            int inputLen = data.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(data, offSet, MAX_ENCRYPT_BLOCK);
                } else {
                    cache = cipher.doFinal(data, offSet, inputLen - offSet);
                }
                out.write(cache, 0, cache.length);
                i++;
                offSet = i * MAX_ENCRYPT_BLOCK;
            }
            return out.toByteArray();
        } catch (Exception e) {
            throw new RuntimeException("加密失败", e);
        }
    }

    /**
     * 私钥解密
     *
     * @param pubKey
     * @param data
     * @return
     */
    public static String decryptByPrivateKey(String priKey, String data) {
        try {
            return new String(decryptByPrivateKey(priKey, decryptBASE64(data)),
                    "utf-8");
        } catch (IOException e) {
            throw new RuntimeException("解密失败", e);
        }
    }

    /**
     * 私钥解密
     *
     * @param prikey
     * @param data
     * @return
     */
    public static byte[] decryptByPrivateKey(String priKey, byte[] data) {
        try {
            byte[] keyBytes = decryptBASE64(priKey);
            PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
            KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
            Key key = keyFactory.generatePrivate(pkcs8KeySpec);

            Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
            cipher.init(Cipher.DECRYPT_MODE, key);

            int inputLen = data.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(data, offSet, MAX_DECRYPT_BLOCK);
                } else {
                    cache = cipher.doFinal(data, offSet, inputLen - offSet);
                }
                out.write(cache, 0, cache.length);
                i++;
                offSet = i * MAX_DECRYPT_BLOCK;
            }
            cache = out.toByteArray();
            out.close();
            return cache;
        } catch (Exception e) {
            throw new RuntimeException("解密失败", e);
        }
    }

    /**
     * 使用私钥加密数据 用一个已打包成的私钥加密数据，即数字签名
     *
     * @param priKey 获取到的的私钥(我方的)
     * @param source 要签名的数据，一般应是数字摘要
     * @return 签名 byte[]
     */
    public static String sign(String priKey, byte[] source) {
        try {
            byte[] keyBytes = decryptBASE64(priKey);
            PKCS8EncodedKeySpec priSpec = new PKCS8EncodedKeySpec(keyBytes);
            KeyFactory mykeyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
            PrivateKey key = mykeyFactory.generatePrivate(priSpec);

            Signature sig = Signature.getInstance(KEY_SIGN);
            sig.initSign(key);
            sig.update(source);
            return encryptBASE64(sig.sign());
        } catch (Exception e) {
            throw new RuntimeException("加签失败", e);
        }
    }

    /**
     * 验证数字签名
     *
     * @param pubKey 获取到的公钥(我方的)
     * @param source 原文的数字摘要
     * @param sign   签名（对原文的数字摘要的签名）
     * @return 是否证实 boolean
     */
    public static boolean verify(String pubKey, byte[] source, String sign) {
        try {
            byte[] keyBytes = decryptBASE64(pubKey);
            KeyFactory mykeyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
            Signature sig = Signature.getInstance(KEY_SIGN);
            X509EncodedKeySpec pubSpec = new X509EncodedKeySpec(keyBytes);
            PublicKey key = mykeyFactory.generatePublic(pubSpec);

            sig.initVerify(key);
            sig.update(source);
            return sig.verify(decryptBASE64(sign));
        } catch (Exception e) {
            logger.error("验签失败", e);
            return false;
        }
    }

    /**
     * 私钥加密
     *
     * @param priKey
     * @param data
     * @return
     */
    public static String encryptByPrivateKey(String priKey, String data) {
        try {
            return encryptBASE64(encryptByPrivateKey(priKey, data.getBytes("utf-8")));
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("加密失败", e);
        }
    }

    /**
     * 私钥加密
     *
     * @param priKey
     * @param data
     * @return
     */
    public static byte[] encryptByPrivateKey(String priKey, byte[] data) {
        try {
            byte[] bytes = decryptBASE64(priKey);
            // 取得私钥
            PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(bytes);
            KeyFactory factory = KeyFactory.getInstance(KEY_ALGORITHM);
            Key key = factory.generatePrivate(keySpec);
            // 对数据加密
            Cipher cipher = Cipher.getInstance(factory.getAlgorithm());
            cipher.init(Cipher.ENCRYPT_MODE, key);

            int inputLen = data.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(data, offSet, MAX_ENCRYPT_BLOCK);
                } else {
                    cache = cipher.doFinal(data, offSet, inputLen - offSet);
                }
                out.write(cache, 0, cache.length);
                i++;
                offSet = i * MAX_ENCRYPT_BLOCK;
            }
            cache = out.toByteArray();
            out.close();
            return cache;
        } catch (Exception e) {
            throw new RuntimeException("加密失败", e);
        }
    }

    /**
     * 公钥解密
     *
     * @param pubKey
     * @param data
     * @return
     */
    public static String decryptByPublicKey(String pubKey, String data) {
        try {
            return new String(decryptByPublicKey(pubKey, decryptBASE64(data)),
                    "utf-8");
        } catch (IOException e) {
            throw new RuntimeException("解密失败", e);
        }
    }

    /**
     * 公钥解密
     *
     * @param pubKey
     * @param data
     * @return
     */
    public static byte[] decryptByPublicKey(String pubKey, byte[] data) {
        try {
            // 对公钥解密
            byte[] bytes = decryptBASE64(pubKey);
            // 取得公钥
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(bytes);
            KeyFactory factory = KeyFactory.getInstance(KEY_ALGORITHM);
            Key key = factory.generatePublic(keySpec);
            // 对数据解密
            Cipher cipher = Cipher.getInstance(factory.getAlgorithm());
            cipher.init(Cipher.DECRYPT_MODE, key);

            int inputLen = data.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(data, offSet, MAX_DECRYPT_BLOCK);
                } else {
                    cache = cipher.doFinal(data, offSet, inputLen - offSet);
                }
                out.write(cache, 0, cache.length);
                i++;
                offSet = i * MAX_DECRYPT_BLOCK;
            }
            cache = out.toByteArray();
            out.close();
            return cache;
        } catch (Exception e) {
            throw new RuntimeException("解密失败", e);
        }
    }

    public static byte[] decryptBASE64(String key) throws IOException {
        return new BASE64Decoder().decodeBuffer(key);
    }

    public static String encryptBASE64(byte[] bytes) {
        return new BASE64Encoder().encodeBuffer(bytes);
    }

    public static String encryptBASE64(InputStream in) throws IOException {
        StringBuilder builder = new StringBuilder();

        BASE64Encoder encoder = new BASE64Encoder();
        byte[] byteBuf = new byte[6 * 760];
        int length;
        while ((length = in.read(byteBuf)) != -1) {
            if (length != byteBuf.length) {
                byte[] copy = Arrays.copyOf(byteBuf, length);
                builder.append(encoder.encode(copy));
            } else {
                builder.append(encoder.encode(byteBuf));
            }
        }
        return builder.toString();
    }

    public static String encryptBASE64(InputStream in, String prefix) throws IOException {
        StringBuilder builder = new StringBuilder(prefix);

        BASE64Encoder encoder = new BASE64Encoder();
        byte[] byteBuf = new byte[6 * 760];
        int length;
        while ((length = in.read(byteBuf)) != -1) {
            if (length != byteBuf.length) {
                byte[] copy = Arrays.copyOf(byteBuf, length);
                builder.append(encoder.encode(copy));
            } else {
                builder.append(encoder.encode(byteBuf));
            }
        }
        return builder.toString();
    }
}

前台加密

首先引入：jsencrypt.min.js 
链接：https://pan.baidu.com/s/1vd4AK9iHUHwmOtbdUP2l6Q 密码：hkvr

js代码：
var password = $("#password").val()；
var encrypt = new JSEncrypt();
      encrypt.setPublicKey(publicKey);
      pwd = encrypt.encrypt(password);
pwd 即为加密后的密码。