安卓RSA私钥解密 出现乱码

最近遇到了1个奇葩的项目需求,需要在安卓客户端做RSA私钥解密的工作,写了代码以后发现一直输出乱码

```public class RSAUtils {
/**
* load private key from a stream
*
* @param
* @return
* @throws Exception
*/

private static final int MAX_DECRYPT_BLOCK = 256;


private static RSAPrivateKey loadPrivateKey(InputStream in) throws Exception {
    RSAPrivateKey priKey;
    try {
        BufferedReader br = new BufferedReader(new InputStreamReader(in));
        String readLine = null;
        StringBuilder sb = new StringBuilder();
        while ((readLine = br.readLine()) != null) {
            if (readLine.charAt(0) == '-') {
                continue;
            } else {
                sb.append(readLine);
                sb.append('\r');
            }
        }
        byte[] priKeyData = Base64.decode(new String(sb), Base64.DEFAULT);


        PKCS8EncodedKeySpec keySpec= new PKCS8EncodedKeySpec(priKeyData);
        KeyFactory keyFactory= KeyFactory.getInstance("RSA");
        priKey= (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
    } catch (IOException e) {
        throw new Exception("error reading the key");
    } catch (NullPointerException e) {
        throw new Exception("inputstream is null");
    }
    return priKey;
}


/**
 * decrypt with a private key
 *
 * @param privateKey
 * @param cipherData
 * @return
 * @throws Exception
 */
private static byte[] decrypt(RSAPrivateKey privateKey, byte[] cipherData) throws Exception {
    if (privateKey == null) {
        throw new Exception("key is null");
    }
    Cipher cipher = null;
    try {
        cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, privateKey);

        int inputLen = cipherData.length;
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        int offSet = 0;
        byte[] cache;
        int i = 0;
        while (inputLen - offSet > 0) {
            if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
                cache = cipher.doFinal(cipherData, offSet, MAX_DECRYPT_BLOCK);
            } else {
                cache = cipher.doFinal(cipherData, offSet, inputLen - offSet);
            }
            out.write(cache, 0, cache.length);
            i++;
            offSet = i * MAX_DECRYPT_BLOCK;
        }
        byte[] decryptedData = out.toByteArray();
        out.close();
        return decryptedData;

    } catch (NoSuchAlgorithmException e) {
        throw new Exception("no such algorithm");
    } catch (NoSuchPaddingException e) {
        e.printStackTrace();
        return null;
    } catch (InvalidKeyException e) {
        throw new Exception("InvalidKeyException");
    } catch (IllegalBlockSizeException e) {
        throw new Exception("IllegalBlockSizeException");
    } catch (BadPaddingException e) {
        throw new Exception("BadPaddingException");
    }
}

public static String RSADecrypt(Context context, String KeyFileNameInAssetFolder, byte[] content) {
    String result = "error";
    try {
        InputStream inputStream = context.getResources().getAssets().open(KeyFileNameInAssetFolder);
        RSAPrivateKey privateKey = loadPrivateKey(inputStream);
        byte[] b = decrypt(privateKey, content);
        result = new String(b);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return result;
}
调用的时候  我调了

String result = RSAUtils.RSADecrypt(getApplicationContext(),"pkcs8.pem",Base64.decode(s,Base64.DEFAULT));


然后输出的一直是
��*�ۘˋ��Ӡ���b$�<Ni����E�Dν��Y��u��Z߱���C�$i�3��yDŽS�bI.E�lI�Cq\}e|=xc�t���%�̳��(�>�`�����=ݞ*��6̞Q;��D��ffd��W�J: �������C�tG���r�=�5�n����#a�x��٠���^��l�Y�ث�2��#�j�\��.^�N�y�`�6_X੒J��,�8�ԑDw�tpV�|<Zܕ~�$u���������#���U�)�3�0ͧ%�K��>\5[�H�D�4��I�
类似这种东西  不这i到哪里错了 

2个回答

Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");

建议你先看下byte[] b = decrypt(privateKey, content);这句话结果对不对,然后result = new String(b);这里有一个强制转换我觉得是有问题的。

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<div class="post-text" itemprop="text"> <p>I'm trying to implement <a href="http://docs.opscode.com/api_chef_server.html" rel="nofollow noreferrer">Chef API client</a> in Go, but stuck trying to create correct request header RSA signature. According to <a href="http://docs.opscode.com/api_chef_server.html" rel="nofollow noreferrer">documentation</a>:</p> <blockquote> <p>A canonical header is signed with the private key used by the client machine from which the request is sent, and is also encoded using Base64.</p> </blockquote> <p>The following ruby call to <code>OpenSSL::PKey::RSA.private_encrypt()</code> can be found in <code>mixlib-authentication</code> <a href="https://github.com/opscode/mixlib-authentication/blob/master/lib/mixlib/authentication/signedheaderauth.rb#L94" rel="nofollow noreferrer">gem code</a>, it uses <a href="http://ruby-doc.org/stdlib-1.9.2/libdoc/openssl/rdoc/OpenSSL/PKey/RSA.html#method-i-private_encrypt" rel="nofollow noreferrer">OpenSSL bindings</a>, <code>private_encrypt()</code> method calls <code>RSA_private_encrypt</code> <a href="http://www.openssl.org/docs/crypto/RSA_private_encrypt.html" rel="nofollow noreferrer">openssl function</a>.</p> <p>Unfortunately, I cannot find matching function in Go's standard library; <a href="http://golang.org/pkg/crypto/rsa/" rel="nofollow noreferrer"><code>crypto/rsa</code></a> looks close, but it only implements conventional cryptography methods: encryption with <em>public</em> key, hash signing with <em>private</em> key. OpenSSL's <code>RSA_private_encrypt</code> does the opposite: it encrypts (small) message with private key (akin to creating a signature from message hash).</p> <p>This "signing" can also be achieved with this command:</p> <pre><code>openssl rsautl -sign -inkey path/to/private/key.pem \ -in file/to/encrypt -out encrypted/output </code></pre> <p>Are there any native Go libraries to achieve the same result as OpenSSL's <code>RSA_private_encrypt</code>, or the only way is using Cgo to call this function from OpenSSL library? Maybe I'm missing something. My idea was implementing the client without any non-go dependencies.</p> <p>I'm a Go newbie, so I'm not sure I can dive into <code>crypto/rsa</code> module sources.</p> <hr> <p>Found the <a href="https://stackoverflow.com/questions/3107143/how-do-i-encrypt-with-an-rsa-private-key-read-from-a-pem-file-using-the-go-progr">similar question</a>, but <a href="https://stackoverflow.com/a/3114679/229034">the answer</a> to use <code>SignPKCS1v15</code> is obviously wrong (this <a href="http://golang.org/pkg/crypto/rsa/#SignPKCS1v15" rel="nofollow noreferrer">function encrypts message's hash, not the message itself</a>).</p> </div>

RSA简单实现公钥私钥正确为何加密解密后不一致?

import java.math.BigInteger; import java.security.SecureRandom; import java.util.Date; public class RSA { private BigInteger p,q,n,d; private BigInteger e=new BigInteger("65537"); private static BigInteger y; private static BigInteger x; private void getPrime(int length){ SecureRandom random=new SecureRandom(); random.setSeed(new Date().getTime()); while((p=BigInteger.probablePrime(length, random)).isProbablePrime(1)==false) { continue; } while((q=BigInteger.probablePrime(length, random)).isProbablePrime(1)==false) { continue; } } public static BigInteger e_gcd(BigInteger a,BigInteger b){ if(b.intValue()==0){ x=new BigInteger("1"); y=new BigInteger("0"); return a; } BigInteger ans=e_gcd(b, a.mod(b)); BigInteger tmp=x; x=y; y=tmp.subtract(a.divide(b).multiply(y)); // System.out.println("tmp= "+tmp); // System.out.println("gcd a="+a+" gcd b="+b+" gcd x="+x+" gcd y="+y); // //System.out.println("gcd y="+y); // return ans; } BigInteger cald(BigInteger e,BigInteger n){ BigInteger gcd=e_gcd(e, n); if(BigInteger.ONE.mod(gcd).intValue()!=0) return new BigInteger("-1"); x.multiply(BigInteger.ONE.divide(gcd)); n=n.abs(); BigInteger ans=x.mod(n); if(ans.compareTo(BigInteger.ZERO)<0) ans.add(n); return ans; } public BigInteger getp(){ return p; } public BigInteger getq(){ return q; } public BigInteger getn(){ return n; } public BigInteger gete(){ return e; } public BigInteger getd(){ return d; } public RSA(int length){ getPrime(length/2); n=p.multiply(q); d=cald(e, n); //System.out.println("test : "+e.multiply(d).mod(n)); } public RSA() { getPrime(128); n=p.multiply(q); //d=cald(e, n); BigInteger tmp=p.subtract(BigInteger.ONE).multiply(q.subtract(BigInteger.ONE)); d=e.modPow(tmp.subtract(BigInteger.ONE),n ); } public static void main(String[] args) { // TODO Auto-generated method stub RSA rsa=new RSA(20); System.out.println("P= " +rsa.getp()); System.out.println("Q= " +rsa.getq()); System.out.println("E= " +rsa.gete()); System.out.println("N= " +rsa.getn()); System.out.println("D= " +rsa.getd()); BigInteger test=new BigInteger("100"); System.out.println("test:"+rsa.gete().multiply(rsa.getd()).mod(rsa.getn())); BigInteger testc=test.modPow(rsa.getd(),rsa.getn()); testc=testc.modPow(rsa.gete(),rsa.getn()); boolean flag =testc.equals(test); System.out.println(flag); } } 代码如上,e*d=1(mod n)成立了,为何在加解密之后不一致呢??

Android RSA解密

目前项目有一个后台是使用RSA公钥加密,而后台给我的私钥是字符串, 请问如何把后台给的是要的字符串转换成PrivateKey

rsa算法中私钥能不能是负数

C语言写的函数计算17x+3120y=1的时候x的乘法逆元算出来是-367,请问能不能用负数作为私钥啊?

RSA算法中的公钥和私钥可以保存在数据库里面吗?

毕设是网页防篡改系统。 其中有两个模块,备份模块和恢复模块。 备份模块用私钥对文件的摘要值进行签名,恢复模块用公钥解密摘要值。 因为两个模块是分开的, 我如何保存公钥和私钥对? 可以保存在数据库里面吗?

RSA算法不能正确解密恢复出明文

使用的是c语言 gmp库 我用下面这组数据带入算法运算的时候解密不能恢复明文 mpz_set_str(e,"65537",10); mpz_set_str(n,"1230186684530117755130494958384962720772853569602684000930682370237375327267189248045201033832655086918491681399537211779227448404000986882410910322526476773383926313461670429214311602221240479274737794080665351419597459856902143413",10); mpz_set_str(d,"1062994521338184055923217869193591999593614258305995010035621749951059169372124557376744961562831035479106213553500897603887838020180839555914663081145548424332284989327664283560563886777580397276589830493528318612618066192694331393",10); mpz_set_str(m,"12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890",10); mpz_powm(c,m,e,n); gmp_printf("c=%Zd\n",c); mpz_powm(m,c,d,n); gmp_printf("m=%Zd\n",m); 已经检查过公钥和私钥是正确的(即 e*d mod n的欧拉数=1),n是232位数,m是230位数 我用下面这组数据带入算法运算的时候解密是可以得到正确结果的 mpz_set_str(e,"5",10); mpz_set_str(n,"633323",10); mpz_set_str(d,"379037",10); mpz_set_str(m,"497351",10); mpz_powm(c,m,e,n); gmp_printf("c=%Zd\n",c); mpz_powm(m,c,d,n); gmp_printf("m=%Zd\n",m); 求大佬帮看一下原因 难道是因为数设的太大了吗?应该不会吧

Mvc使用RSA加密解密出现问题

mvc中,cshtml前端的JavaScript中RSA加密,后台controller的action进行解密,我使用IE浏览器进行RSA加密解密是没问题的,到那时我使用google浏览器进行RSA加密解密就出问题了,报错:数据不正确,请问哪位大神知道为什么呀?不吝赐教,谢谢了

Android中的RSA生成正确的密钥但错误的解密

<div class="post-text" itemprop="text"> <p>I am trying to encrypt username and password data in MySQL database using PHP and Android. I am keeping the data as a <strong>BLOB</strong> type in MySQL DB along with the <strong>public key in the Database</strong>. NOTE : Retrieval and Submission of done is done in <strong>JSON format using HTTP</strong>.</p> <p><strong>But</strong> : I am getting the <strong>wrong data</strong>(<strong>easily visible in log below</strong> that (sid,a) is used for (username,password) and (YzJsawo=,YzJsawo=) is obtained) after decryption despite using Base64encoding to retrieve the data.(I have already tried it with CHAR and VARCHAR but no success). </p> <p><strong>Please help</strong> I have my project submission tomorrow. Worried. If at all u think that u won't be able to read the code that i have written please provide me with an alternative for above problem or a link where similar problem is discussed(Although i couldn't find one).</p> <p>Here is what I am trying to do.</p> <p><strong>Encryption Part</strong></p> <p></p><div class="snippet" data-lang="js" data-hide="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>protected String doInBackground(String... args) { runOnUiThread(new Runnable() { public void run() { userStr = inputUsername.getText().toString(); passStr = inputPassword.getText().toString(); confirmpass = inputConfirmPass.getText().toString(); if(userStr.equals("") || passStr.equals("") || confirmpass.equals("")) { Toast.makeText(getApplicationContext(),"Enter all the fields" ,Toast.LENGTH_SHORT).show(); } else { if(passStr.equals(confirmpass)) { //Encoding the string using RSA Algorithm // Original text valid=1; // Generate key pair for 1024-bit RSA encryption and decryption Key publicKey = null; Key privateKey = null; String publicKeyStr; try { KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA"); kpg.initialize(1024); KeyPair kp = kpg.genKeyPair(); publicKey = kp.getPublic(); privateKey = kp.getPrivate(); } catch (Exception e) { Log.e("", "RSA key pair error"); } byte[] encodedUser = null,encodedPassword = null; //Changing public key to str to transfer it between activities publicKeyStr = Base64.encodeToString(publicKey.getEncoded(), Base64.DEFAULT); try { //Encoding Username // Encode the original data with RSA private key Cipher c = Cipher.getInstance("RSA/ECB/PKCS1Padding"); c.init(Cipher.ENCRYPT_MODE, privateKey); encodedUser = c.doFinal(Base64.encode(userStr.getBytes("utf-8"),Base64.DEFAULT)); //Encoding Password encodedPassword = c.doFinal(Base64.encode(passStr.getBytes("utf-8"),Base64.DEFAULT)); } catch (Exception e) { Log.e("Error Type:", "RSA encryption error"); } String UsernameStrEncod,PasswordStrEncod; UsernameStrEncod = Base64.encodeToString(encodedUser, Base64.DEFAULT); PasswordStrEncod = Base64.encodeToString(encodedPassword, Base64.DEFAULT); List&lt;NameValuePair&gt; params = new ArrayList&lt;NameValuePair&gt;(); params.add(new BasicNameValuePair("username", UsernameStrEncod)); params.add(new BasicNameValuePair("password", PasswordStrEncod)); params.add(new BasicNameValuePair("publickey", publicKeyStr)); // getting JSON Object // Note that create product url accepts POST method JSONObject json = jsonParser.makeHttpRequest(url_register_user,"POST", params); // check log cat fro response Log.d("Create Response", json.toString()); // check for success tag try { int success = json.getInt(TAG_SUCCESS); if (success == 1) { // successfully created product Intent i = new Intent(getApplicationContext(), LoginActivity.class); //i.putExtra("encodedUser", encodedUser); //i.putExtra("publicKey", publicKeyStr); startActivity(i); // closing this screen finish(); } else { // failed to create product } } catch (JSONException e) { e.printStackTrace(); } } else Toast.makeText(getApplicationContext(),"Both the passwords do not match" ,Toast.LENGTH_SHORT).show(); } } }); return null; }</code></pre> </div> </div> <p><strong>Decryption Part</strong></p> <p></p><div class="snippet" data-lang="js" data-hide="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>protected String doInBackground(String... params) { // updating UI from Background Thread runOnUiThread(new Runnable() { public void run() { // Check for success tag int success; int found=0; try { //EditText variable initialization inputUsername = (EditText) findViewById(R.id.UsernameID); inputPassword = (EditText) findViewById(R.id.PasswordID); //Converting EditText to string user = inputUsername.getText().toString(); password = inputPassword.getText().toString(); if(user.equals("") || (password.equals(""))) Toast.makeText(getApplicationContext(),"Enter Both the fields" ,Toast.LENGTH_SHORT).show(); // Building Parameters else { List&lt;NameValuePair&gt; params = new ArrayList&lt;NameValuePair&gt;(); params.add(new BasicNameValuePair("username", user)); params.add(new BasicNameValuePair("password", password)); Log.d(user,password); // getting product details by making HTTP request // Note that product details url will use GET request JSONObject json = jsonParser.makeHttpRequest(url_login_details, "GET", params); // check your log for json response Log.d("Login Details", json.toString()); // json success tag success = json.getInt(TAG_SUCCESS); if (success == 1) { // successfully received product details JSONArray userArray = json.getJSONArray(TAG_USER); // JSON Array for(int j=0; (j&lt;userArray.length()) &amp;&amp; (found==0); ++j) { // get first product object from JSON Array JSONObject userObj = userArray.getJSONObject(j); String u = userObj.getString(TAG_USERNAME); String p = userObj.getString(TAG_PASSWORD); String publicKey = userObj.getString(TAG_PUBLICKEY); Log.d("usernameBlob:", u); Log.d("passwordBlob:", p); Log.d("publickeyBlob:", publicKey); //Decoding the data obtained from DB byte[] UsernameByteDecod = null, PasswordByteDecod = null; String UsernameStrDecod = null,PasswordStrDecod = null; try { //Converting the string public key into key type byte[] keyBytes = Base64.decode(publicKey.getBytes("utf-8"),Base64.DEFAULT); X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); PublicKey publickey = keyFactory.generatePublic(spec); Cipher c = Cipher.getInstance("RSA/ECB/PKCS1Padding"); c.init(Cipher.DECRYPT_MODE, publickey); //Decoding the data UsernameByteDecod = c.doFinal(Base64.decode(u.getBytes("UTF-8"),Base64.DEFAULT)); PasswordByteDecod = c.doFinal(Base64.decode(u.getBytes("UTF-8"),Base64.DEFAULT)); UsernameStrDecod = Base64.encodeToString(UsernameByteDecod, Base64.DEFAULT); PasswordStrDecod = Base64.encodeToString(PasswordByteDecod, Base64.DEFAULT); Log.d("Username:",UsernameStrDecod); Log.d("Password:",PasswordStrDecod); } catch (Exception e) { Log.e("RSA Error:", "RSA decryption error"); e.printStackTrace(); } if((user.equals(UsernameStrDecod)) &amp;&amp; (password.equals(PasswordStrDecod))) { found=1; } else if(user.equals(u)) { Toast.makeText(getApplicationContext(),"Password is Incorrect" ,Toast.LENGTH_SHORT).show(); break; } else { } // display product data in EditText } } else { Toast.makeText(getApplicationContext(),"You are not registered, Register Here" ,Toast.LENGTH_SHORT).show(); Intent i = new Intent(getApplicationContext(), RegisterActivity.class); startActivity(i); } if(found==1) { Toast.makeText(getApplicationContext(),"Welcome "+ user ,Toast.LENGTH_SHORT).show(); Intent i = new Intent(getApplicationContext(), MainActivity.class); startActivity(i); //finish(); } else if(found==0) { Toast.makeText(getApplicationContext(),"You are not registered, Register Here" ,Toast.LENGTH_SHORT).show(); Intent i = new Intent(getApplicationContext(), RegisterActivity.class); startActivity(i); //finish(); } } } catch (JSONException e) { e.printStackTrace(); } } }); return null; }</code></pre> </div> </div> <p><strong>PHP Script for Inserting data after Encryption</strong></p> <p></p><div class="snippet" data-lang="js" data-hide="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>&lt;?php /* * Following code will create a new product row * All product details are read from HTTP Post Request */ // array for JSON response $response = array(); // check for required fields if (isset($_POST['username']) &amp;&amp; isset($_POST['password']) &amp;&amp; isset($_POST['publickey'])) { $username = $_POST['username']; $password = $_POST['password']; $publickey = $_POST['publickey']; // include db connect class require_once __DIR__ . 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An error occurred."; // echoing JSON response echo json_encode($response); } } else { // required field is missing $response["success"] = 0; $response["message"] = "Required field(s) is missing"; // echoing JSON response echo json_encode($response); } ?&gt;</code></pre> </div> </div> <p><strong>PHP Script for retrieving data and Decrypting it afterwards</strong></p> <p></p><div class="snippet" data-lang="js" data-hide="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>&lt;?php /* * Following code will list all the products * */ // array for JSON response $response = array(); // include db connect class require_once __DIR__ . 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