RSA js加密 java解密

1. 首先你要拥有一对公钥、私钥；

```

pubKeyStr = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC1gr+rIfYlaNUNLiFsK/Knb54nQrCRTRMOdujTwkpqKLo4pNYj2StmryWETeFxOCFtCt/7ixTUrU2RGGjkIOlYC3144h0dJKDtPXw9+mFyW1VwWvtfoiSUeKTEbz1tSHghEcdEvVq6qlSQukiLAEZabiwfEE30TQ6g979X6YXhnQIDAQAB";

priKeyStr = "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";

```

    生成方法略；

2. js中加密

* 获取公钥的 Exponent/ Modulus 供js中使用

```

publicKey.getPublicExponent().toString(16);

publicKey.getModulus().toString(16);

```

* 依赖包地址

http://www.ohdave.com/rsa/ 

引入依赖文件后

```

var rsa_m = "b582bfab21f62568d50d2e216c2bf2a76f9e2742b0914d130e76e8d3c24a6a28ba38a4d623d92b66af25844de17138216d0adffb8b14d4ad4d911868e420e9580b7d78e21d1d24a0ed3d7c3dfa61725b55705afb5fa2249478a4c46f3d6d48782111c744bd5abaaa5490ba488b00465a6e2c1f104df44d0ea0f7bf57e985e19d";

    var rsa_e = "10001";

    setMaxDigits(131); //131 => n的十六进制位数/2+3

    var key      = new RSAKeyPair(rsa_e, '', rsa_m); //e,m是从Java代码中获取的

    var password = "123456";

    password = encryptedString(key, password); //不支持汉字

    // 将password传递到后台，在后台使用Java解密

```

3. java 解密

由于js加密时使用的是nopadding模式（每次加密结果同样），而java中默认是padding15，每次加密结果不同，因此要依赖第三方包来解密

/*

 // http://mvnrepository.com/artifact/org.bouncycastle/bcprov-jdk15on

compile group: 'org.bouncycastle', name: 'bcprov-jdk15on', version: '1.54'

*/

```

RSAUtil.decryptJSRsa(password);

```

java 代码工具类:

```

package com.wch.encrypt;

 

import java.security.KeyFactory;

import java.security.PrivateKey;

import java.security.interfaces.RSAPublicKey;

import java.security.spec.PKCS8EncodedKeySpec;

import java.security.spec.X509EncodedKeySpec;

import java.util.Base64;

 

import javax.crypto.Cipher;

 

import org.bouncycastle.jce.provider.BouncyCastleProvider;

import org.bouncycastle.util.encoders.Hex;

 

import com.netfinworks.util.RSA;

 

/**

* RSA 工具类。提供加密，解密，生成密钥对等方法。 须要bcprov-jdk16-140.jar包。

* js依赖http://www.ohdave.com/rsa/

* // http://mvnrepository.com/artifact/org.bouncycastle/bcprov-jdk15on

compile group: 'org.bouncycastle', name: 'bcprov-jdk15on', version: '1.54'

 

*/

public class RSAUtil {

    private static final String pubKeyStr = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC1gr+rIfYlaNUNLiFsK/Knb54nQrCRTRMOdujTwkpqKLo4pNYj2StmryWETeFxOCFtCt/7ixTUrU2RGGjkIOlYC3144h0dJKDtPXw9+mFyW1VwWvtfoiSUeKTEbz1tSHghEcdEvVq6qlSQukiLAEZabiwfEE30TQ6g979X6YXhnQIDAQAB";

    private static final String priKeyStr = "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";

 

    /**

     * 解密js加密的rsa

     *

     * @param str

     *            js加密后的字符串;

     *            js加密参考http://blog.csdn.net/songxiaobing/article/details

     *            /17505237

     * @return

     */

    public static String decryptJSRsa(String str) {

        PrivateKey privateKey;

        try {

            privateKey = RSA.getPrivateKey(priKeyStr);

            Cipher cipher = Cipher.getInstance("RSA/NONE/NoPadding",

                    new BouncyCastleProvider());

            cipher.init(Cipher.DECRYPT_MODE, privateKey);

            StringBuilder sb = new StringBuilder(new String(cipher.doFinal(Hex

                    .decode(str))));

            return sb.reverse().toString();

        } catch (Exception e) {

            e.printStackTrace();

        }

        return null;

    }

 

    /**

     * 原生加解密代码

     *

     * @throws Exception

     */

    public static void rsaTest() throws Exception {

        KeyFactory factory = KeyFactory.getInstance("RSA",

                new BouncyCastleProvider());

 

        byte[] bytes = Base64.getDecoder().decode(pubKeyStr);

        X509EncodedKeySpec spec = new X509EncodedKeySpec(bytes);

        RSAPublicKey publicKey = (RSAPublicKey) factory.generatePublic(spec);

        System.out.println(publicKey.getPublicExponent().toString(16));

        System.out.println(publicKey.getModulus().toString(16));

 

        byte[] pirvateBytes = Base64.getDecoder().decode(priKeyStr);

        PKCS8EncodedKeySpec privateSpec = new PKCS8EncodedKeySpec(pirvateBytes);

        PrivateKey privateKey = factory.generatePrivate(privateSpec);

 

        byte[] encode = RSA.encrypt("wch".getBytes(), privateKey);

        System.out.println(Base64.getEncoder().encodeToString(encode));

        System.out.println(new String(RSA.decrypt(encode, publicKey)));

 

        byte[] publicEncode = RSA.encrypt("pubic".getBytes(), publicKey);

        System.out.println(Base64.getEncoder().encodeToString(publicEncode));

        System.out.println(new String(RSA.decrypt(publicEncode, privateKey)));

 

        byte[] sign = RSA.sign("wch".getBytes(), privateKey);

        System.out.println(Base64.getEncoder().encodeToString(sign));

 

        System.out.println(RSA.verify("wch".getBytes(), sign, publicKey));

    }

 

    public static void main(String[] args) throws Exception {

        rsaTest();

    }

 

}

```

    

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