java RSA验签

这几天在跟一个php的小哥哥联调接口，遇到了一些问题记录下来，

直接上代码吧，亲测有效

　　

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.Base64Utils;

import javax.crypto.Cipher;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.security.KeyFactory;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

public class Rsa {
    private static Logger logger = LoggerFactory.getLogger(Rsa.class);
    public  String priKey ;
    public  String pubKey ;

    public static void main(String[] args) {
        Rsa rsa = new Rsa();
/*        String str = "我要加密这段文字。";
        System.out.println("原文:"+"我要加密这段文字。");
        String crypt = rsa.encryptByPrivateKey(str);
        System.out.println("私钥加密密文:"+crypt);
        String result = rsa.decryptByPublicKey(crypt);
        System.out.println("原文:"+result);

        System.out.println("---");

        str = "我要加密这段文字。";
        System.out.println("原文:"+"我要加密这段文字。");
        crypt = rsa.encryptByPublicKey(str);
        System.out.println("公钥加密密文:"+crypt);
        result = rsa.decryptByPrivateKey(crypt);
        System.out.println("原文:"+result);
     Rsa ras = new Rsa();
        System.out.println("---");*/
        String str = "我要加密这段文字。";
        str = "eyJjYXJJbWFnZXMiOiJbe1wiaW1hZ2VUeXBlXCI6MCxcImltYWdlVXJsXCI6XCJodHRwOi8vMTkyLjE2OC4xMDUuMTA1L2luem9uZV9waWNzL2luem9uZS1pbWFnZXMvMjAxOTA3MjQvMTU2Mzk1NDA4Njk1OF83N19wbGF0ZS5qcGdcIn0se1wiaW1hZ2VUeXBlXCI6MSxcImltYWdlVXJsXCI6XCJodHRwOi8vMTkyLjE2OC4xMDUuMTA1L2luem9uZV9waWNzL2luem9uZS1pbWFnZXMvMjAxOTA3MjQvMTU2Mzk1NDA4Njk1OF83N19mdWxsLmpwZ1wifV0iLCJjYXJOdW1iZXIiOiJBRjAyMzYiLCJlbnRyeVRpbWUiOiIxNTYzOTU0MDg2IiwiaGFzTGljZW5zZSI6IjEiLCJwYXJrTnVtYmVyIjoiMDcxOTEzNTc1NTM1NCIsInRpbWVzdGFtcCI6IjE1NjM5NTQwODgifQ==";
        Rsa ras = new Rsa();
        System.out.println("原文："+str);
        String sign = ras.signByPrivateKey(str);

        String signStr = "RjI0akRpV1VWRE9oK2NPV0JkSDFGLzE3SGczeGFUa1Nud1JJa3ExUHZweE9Eb1N0dkhWWDQrK29oRDd3cFFsa1ZZTEFPNmdUaCttZlVreE5mT0lyRHkxWmJsZkg4K1g2RkovL2lsK2ZGTFJ0T25qLyt0cmpZL1VEdHR6aWVoSTJaUHR3MzRIS1hCUmpwTWIyUkFWYW9Ta2RQU2hwakpJamdER1FqWmpoTVhFPQ==";
        System.out.println("sign："+sign);
        String result = ras.base64encode(sign.getBytes());

        byte[]  result22 = ras.base64decode(signStr);

        System.out.println("验签Base64解码："+new String (result22));
        if(rsa.verifyByPublicKey(new String (result22), str)){
            System.out.println("验签成功");
        } else {
            System.out.println("验签失败");
        }

    }

    public Rsa(){
        pubKey ="MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCP5XdjF/eOSVcN7czmL+YCJARYR/65sA6h3e1NLpBQQqgV6eTQtqicMZBvY76ZJZWXnAKxjXJZnKzG29EHmQOL/FdkLI3IktKtkf3DxRhbSs0TqQgx0upECwlL8SGRvHWeApo8wok6IpqYyRY+3IqJjj0ZpKgv7lvPHNdETpCE5wIDAQAB";
        priKey ="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";
    }

    /**
     * 使用私钥加密
     * @see
     */
    public String encryptByPrivateKey(String data) {
        // 加密
        String str = "";
        try {
            byte[] pribyte = base64decode(priKey.trim());
            PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(pribyte);
            KeyFactory fac = KeyFactory.getInstance("RSA");
            RSAPrivateKey privateKey = (RSAPrivateKey) fac.generatePrivate(keySpec);
            Cipher c1 = Cipher.getInstance("RSA/ECB/PKCS1Padding");
            c1.init(Cipher.ENCRYPT_MODE, privateKey);
            str = base64encode(c1.doFinal(data.getBytes()));
        } catch (Exception e) {
            e.printStackTrace();

        }
        return str;
    }

    /**
     * 使用私钥解密
     * @see
     */
    public String decryptByPrivateKey(String data) {
        // 加密
        String str = "";
        try {
            byte[] pribyte = base64decode(priKey.trim());
            PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(pribyte);
            KeyFactory fac = KeyFactory.getInstance("RSA");
            RSAPrivateKey privateKey = (RSAPrivateKey) fac.generatePrivate(keySpec);
            Cipher c1 = Cipher.getInstance("RSA/ECB/PKCS1Padding");
            c1.init(Cipher.DECRYPT_MODE, privateKey);
            byte[] temp = c1.doFinal(base64decode(data));
            str = new String(temp);
        } catch (Exception e) {
            e.printStackTrace();

        }
        return str;
    }

    /**
     * 使用公钥加密
     * @see
     */
    public String encryptByPublicKey(String data) {
        // 加密
        String str = "";
        try {
            byte[] pubbyte = base64decode(pubKey.trim());
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(pubbyte);
            KeyFactory fac = KeyFactory.getInstance("RSA");
            RSAPublicKey rsaPubKey = (RSAPublicKey) fac.generatePublic(keySpec);
            Cipher c1 = Cipher.getInstance("RSA/ECB/PKCS1Padding");
            c1.init(Cipher.ENCRYPT_MODE, rsaPubKey);
            str = base64encode(c1.doFinal(data.getBytes()));
        } catch (Exception e) {
            e.printStackTrace();

        }
        return str;
    }

    /**
     * 使用公钥解密
     * @see
     */
    public String decryptByPublicKey(String data) {
        // 加密
        String str = "";
        try {
            byte[] pubbyte = base64decode(pubKey.trim());
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(pubbyte);
            KeyFactory fac = KeyFactory.getInstance("RSA");
            RSAPublicKey rsaPubKey = (RSAPublicKey) fac.generatePublic(keySpec);
            Cipher c1 = Cipher.getInstance("RSA/ECB/PKCS1Padding");
            c1.init(Cipher.DECRYPT_MODE, rsaPubKey);
            byte[] temp = c1.doFinal(base64decode(data));
            str = new String(temp);
        } catch (Exception e) {
            e.printStackTrace();

        }
        return str;
    }
    /**
     * 本方法使用SHA1withRSA签名算法产生签名
     * @param  src 签名的原字符串
     * @return String 签名的返回结果(16进制编码)。当产生签名出错的时候，返回null。
     */
    public String signByPrivateKey(String src) {
        try {
            Signature sigEng = Signature.getInstance("SHA1withRSA");
            byte[] pribyte = base64decode(priKey.trim());

            PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(pribyte);
            KeyFactory fac = KeyFactory.getInstance("RSA");
            RSAPrivateKey privateKey = (RSAPrivateKey) fac.generatePrivate(keySpec);
            sigEng.initSign(privateKey);
            sigEng.update(src.getBytes());
            byte[] signature = sigEng.sign();
            return base64encode(signature);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 使用共钥验证签名
     * @param sign
     * @param src
     * @return
     */
    public boolean verifyByPublicKey(String sign, String src) {
        try {
            Signature sigEng = Signature.getInstance("SHA1withRSA");
            byte[] pubbyte = base64decode(pubKey.trim());
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(pubbyte);
            KeyFactory fac = KeyFactory.getInstance("RSA");
            RSAPublicKey rsaPubKey = (RSAPublicKey) fac.generatePublic(keySpec);
            sigEng.initVerify(rsaPubKey);
            sigEng.update(src.getBytes());
            byte[] sign1 = base64decode(sign);
            return sigEng.verify(sign1);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     *  base64加密
     * @param bstr
     * @return
     */
    @SuppressWarnings("restriction")
    public String base64encode(byte[] bstr) {
        String str = Base64Utils.encodeToString(bstr);
        str = str.replaceAll("\r\n", "").replaceAll("\r", "").replaceAll("\n", "");
        return str;
    }

    /**
     * base64解密
     * @param str
     * @return byte[]
     */
    @SuppressWarnings("restriction")
    public byte[] base64decode(String str) {
        byte[] bt = null;
        try {
            sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();
            bt = decoder.decodeBuffer(str);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return bt;
    }

    /**
     * 从文件中读取所有字符串
     * @param fileName
     * @return	String
     */
    private String readStringFromFile(String fileName){
        StringBuffer str = new StringBuffer();
        try {
            File file = new File(fileName);
            FileReader fr = new FileReader(file);
            char[] temp = new char[1024];
            while (fr.read(temp) != -1) {
                str.append(temp);
            }
            fr.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();

        }
        return str.toString();
    }

}