java 私钥签名公钥认证

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Java实现私钥签名公钥认证demo

package com.ibs.clearing.sign.demo;

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 cn.com.infosec.netsign.crypto.util.Base64;

public class RSAEncrypt {
	 /** 
     * 字节数据转字符串专用集合 
     */  
    private static final char[] HEX_CHAR = { '0', '1', '2', '3', '4', '5', '6',  
            '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };  
  
    /** 
     * 随机生成密钥对 
     */  
    public static void genKeyPair(String filePath) {  
        // KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象  
        KeyPairGenerator keyPairGen = null;  
        try {  
            keyPairGen = KeyPairGenerator.getInstance("RSA");  
        } catch (NoSuchAlgorithmException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        }  
        // 初始化密钥对生成器，密钥大小为96-1024位  
        keyPairGen.initialize(1024,new SecureRandom());  
        // 生成一个密钥对，保存在keyPair中  
        KeyPair keyPair = keyPairGen.generateKeyPair();  
        // 得到私钥  
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();  
        // 得到公钥  
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();  
        try {  
            // 得到公钥字符串  
            String publicKeyString = Base64.encode(publicKey.getEncoded());  
            // 得到私钥字符串  
            String privateKeyString = Base64.encode(privateKey.getEncoded());  
            // 将密钥对写入到文件  
            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();  
        }  
    }  
  
    /** 
     * 从文件中输入流中加载公钥 
     *  
     * @param in 
     *            公钥输入流 
     * @throws Exception 
     *             加载公钥时产生的异常 
     */  
    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("公钥数据流读取错误");  
        } catch (NullPointerException e) {  
            throw new Exception("公钥输入流为空");  
        }  
    }  
  
    /** 
     * 从字符串中加载公钥 
     *  
     * @param publicKeyStr 
     *            公钥数据字符串 
     * @throws Exception 
     *             加载公钥时产生的异常 
     */  
    public static RSAPublicKey loadPublicKeyByStr(String publicKeyStr)  
            throws Exception {  
        try {  
            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("无此算法");  
        } catch (InvalidKeySpecException e) {  
            throw new Exception("公钥非法");  
        } catch (NullPointerException e) {  
            throw new Exception("公钥数据为空");  
        }  
    }  
  
    /** 
     * 从文件中加载私钥 
     *  
     * @param keyFileName 
     *            私钥文件名 
     * @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("私钥数据读取错误");  
        } catch (NullPointerException e) {  
            throw new Exception("私钥输入流为空");  
        }  
    }  
  
    public static RSAPrivateKey loadPrivateKeyByStr(String privateKeyStr)  
            throws Exception {  
        try {  
            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("无此算法");  
        } catch (InvalidKeySpecException e) {  
            throw new Exception("私钥非法");  
        } catch (NullPointerException e) {  
            throw new Exception("私钥数据为空");  
        }  
    }  
  
    /** 
     * 公钥加密过程 
     *  
     * @param publicKey 
     *            公钥 
     * @param plainTextData 
     *            明文数据 
     * @return 
     * @throws Exception 
     *             加密过程中的异常信息 
     */  
    public static byte[] encrypt(RSAPublicKey publicKey, byte[] plainTextData)  
            throws Exception {  
        if (publicKey == null) {  
            throw new Exception("加密公钥为空, 请设置");  
        }  
        Cipher cipher = null;  
        try {  
            // 使用默认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("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");  
        }  
    }  
  
    /** 
     * 私钥加密过程 
     *  
     * @param privateKey 
     *            私钥 
     * @param plainTextData 
     *            明文数据 
     * @return 
     * @throws Exception 
     *             加密过程中的异常信息 
     */  
    public static byte[] encrypt(RSAPrivateKey privateKey, byte[] plainTextData)  
            throws Exception {  
        if (privateKey == null) {  
            throw new Exception("加密私钥为空, 请设置");  
        }  
        Cipher cipher = null;  
        try {  
            // 使用默认RSA  
            cipher = Cipher.getInstance("RSA");  
            cipher.init(Cipher.ENCRYPT_MODE, privateKey);  
            byte[] output = cipher.doFinal(plainTextData);  
            return 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("加密私钥非法,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");  
        }  
    }  
  
    /** 
     * 私钥解密过程 
     *  
     * @param privateKey 
     *            私钥 
     * @param cipherData 
     *            密文数据 
     * @return 明文 
     * @throws Exception 
     *             解密过程中的异常信息 
     */  
    public static byte[] decrypt(RSAPrivateKey privateKey, byte[] cipherData)  
            throws Exception {  
        if (privateKey == null) {  
            throw new Exception("解密私钥为空, 请设置");  
        }  
        Cipher cipher = null;  
        try {  
            // 使用默认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("无此解密算法");  
        } catch (NoSuchPaddingException e) {  
            e.printStackTrace();  
            return null;  
        } catch (InvalidKeyException e) {  
            throw new Exception("解密私钥非法,请检查");  
        } catch (IllegalBlockSizeException e) {  
            throw new Exception("密文长度非法");  
        } catch (BadPaddingException e) {  
            throw new Exception("密文数据已损坏");  
        }  
    }  
  
    /** 
     * 公钥解密过程 
     *  
     * @param publicKey 
     *            公钥 
     * @param cipherData 
     *            密文数据 
     * @return 明文 
     * @throws Exception 
     *             解密过程中的异常信息 
     */  
    public static byte[] decrypt(RSAPublicKey publicKey, byte[] cipherData)  
            throws Exception {  
        if (publicKey == null) {  
            throw new Exception("解密公钥为空, 请设置");  
        }  
        Cipher cipher = null;  
        try {  
            // 使用默认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("无此解密算法");  
        } catch (NoSuchPaddingException e) {  
            e.printStackTrace();  
            return null;  
        } catch (InvalidKeyException e) {  
            throw new Exception("解密公钥非法,请检查");  
        } catch (IllegalBlockSizeException e) {  
            throw new Exception("密文长度非法");  
        } catch (BadPaddingException e) {  
            throw new Exception("密文数据已损坏");  
        }  
    }  
  
    /** 
     * 字节数据转十六进制字符串 
     *  
     * @param data 
     *            输入数据 
     * @return 十六进制内容 
     */  
    public static String byteArrayToString(byte[] data) {  
        StringBuilder stringBuilder = new StringBuilder();  
        for (int i = 0; i < data.length; i++) {  
            // 取出字节的高四位 作为索引得到相应的十六进制标识符 注意无符号右移  
            stringBuilder.append(HEX_CHAR[(data[i] & 0xf0) >>> 4]);  
            // 取出字节的低四位 作为索引得到相应的十六进制标识符  
            stringBuilder.append(HEX_CHAR[(data[i] & 0x0f)]);  
            if (i < data.length - 1) {  
                stringBuilder.append(' ');  
            }  
        }  
        return stringBuilder.toString();  
    }  
}

 RSA签名验签类

 

 

package com.ibs.clearing.sign.demo;

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

import cn.com.infosec.netsign.crypto.util.Base64;

/**
 * RSA签名验签类
 */
public class RSASignature {
	/**
	 * 签名算法
	 */
	public static final String SIGN_ALGORITHMS = "SHA1WithRSA";

	/**
	 * RSA签名
	 * 
	 * @param content
	 *            待签名数据
	 * @param privateKey
	 *            商户私钥
	 * @param encode
	 *            字符集编码
	 * @return 签名值
	 */
	public static String sign(String content, String privateKey, String encode) {
		try {
			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 Base64.encode(signed);
		} catch (Exception e) {
			e.printStackTrace();
		}

		return null;
	}

	public static String sign(String content, String privateKey) {
		try {
			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 Base64.encode(signed);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * RSA验签名检查
	 * 
	 * @param content
	 *            待签名数据
	 * @param sign
	 *            签名值
	 * @param publicKey
	 *            分配给开发商公钥
	 * @param encode
	 *            字符集编码
	 * @return 布尔值
	 */
	public static boolean doCheck(String content, String sign,
			String publicKey, String encode) {
		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(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");
			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;
	}
}

 测试

 

 

package com.ibs.clearing.sign.demo;

import cn.com.infosec.netsign.crypto.util.Base64;

public class MainTest {
	
	public static void main(String[] args) throws Exception {
		String filepath="C:/sign/";  
		  
        //RSAEncrypt.genKeyPair(filepath);  
          
          
        System.out.println("--------------公钥加密私钥解密过程-------------------");  
        String plainText="ihep_公钥加密私钥解密";  
        //公钥加密过程  
        byte[] cipherData=RSAEncrypt.encrypt(RSAEncrypt.loadPublicKeyByStr(RSAEncrypt.loadPublicKeyByFile(filepath)),plainText.getBytes());  
        String cipher=Base64.encode(cipherData);  
        //私钥解密过程  
        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("--------------私钥加密公钥解密过程-------------------");  
        plainText="ihep_私钥加密公钥解密";  
        //私钥加密过程  
        cipherData=RSAEncrypt.encrypt(RSAEncrypt.loadPrivateKeyByStr(RSAEncrypt.loadPrivateKeyByFile(filepath)),plainText.getBytes());  
        cipher=Base64.encode(cipherData);  
        //公钥解密过程  
        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("---------------私钥签名过程------------------");  
        String content="ihep_这是用于签名的原始数据";  
        String signstr=RSASignature.sign(content,RSAEncrypt.loadPrivateKeyByFile(filepath));  
        System.out.println("签名原串："+content);  
        System.out.println("签名串："+signstr);  
        System.out.println();  
          
        System.out.println("---------------公钥校验签名------------------");  
        System.out.println("签名原串："+content);  
        System.out.println("签名串："+signstr);  
          
        System.out.println("验签结果："+RSASignature.doCheck(content, signstr, RSAEncrypt.loadPublicKeyByFile(filepath)));  
        System.out.println();  
	}
	
}