安卓与PHP间的RSA(openssl)交互加密的坑

这几天在写一个安卓的RSA公钥加密算法,用于跟PHP后台接口进行交互。在实践过程中发现了几个坑。其中我的公钥和私钥都是通过openssl生成的pem格式。

遇到的坑:

1.通过java的RSA公钥加密后获得的密文,在PHP中无法解密

2.通过java提取私钥时报错私钥格式不对

以下是相关关键代码[不完善的示例代码]

(该代码可直接百度,一大堆)

1.公钥私钥

<pre>
static String PUCLIC_KEY = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCfRTdcPIH10gT9f31rQuIInLwe" + "\r"
+ "7fl2dtEJ93gTmjE9c2H+kLVENWgECiJVQ5sonQNfwToMKdO0b3Olf4pgBKeLThra" + "\r"
+ "z/L3nYJYlbqjHC3jTjUnZc0luumpXGsox62+PuSGBlfb8zJO6hix4GV/vhyQVCpG" + "\r"
+ "9aYqgE7zyTRZYX9byQIDAQAB" + "\r";
static String PRIVATE_KEY = "MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAJ9FN1w8gfXSBP1/" + "\r"
+ "fWtC4gicvB7t+XZ20Qn3eBOaMT1zYf6QtUQ1aAQKIlVDmyidA1/BOgwp07Rvc6V/" + "\r"
+ "imAEp4tOGtrP8vedgliVuqMcLeNONSdlzSW66alcayjHrb4+5IYGV9vzMk7qGLHg" + "\r"
+ "ZX++HJBUKkb1piqATvPJNFlhf1vJAgMBAAECgYA736xhG0oL3EkN9yhx8zG/5RP/" + "\r"
+ "WJzoQOByq7pTPCr4m/Ch30qVerJAmoKvpPumN+h1zdEBk5PHiAJkm96sG/PTndEf" + "\r"
+ "kZrAJ2hwSBqptcABYk6ED70gRTQ1S53tyQXIOSjRBcugY/21qeswS3nMyq3xDEPK" + "\r"
+ "XpdyKPeaTyuK86AEkQJBAM1M7p1lfzEKjNw17SDMLnca/8pBcA0EEcyvtaQpRvaL" + "\r"
+ "n61eQQnnPdpvHamkRBcOvgCAkfwa1uboru0QdXii/gUCQQDGmkP+KJPX9JVCrbRt" + "\r"
+ "7wKyIemyNM+J6y1ZBZ2bVCf9jacCQaSkIWnIR1S9UM+1CFE30So2CA0CfCDmQy+y" + "\r"
+ "7A31AkB8cGFB7j+GTkrLP7SX6KtRboAU7E0q1oijdO24r3xf/Imw4Cy0AAIx4KAu" + "\r"
+ "L29GOp1YWJYkJXCVTfyZnRxXHxSxAkEAvO0zkSv4uI8rDmtAIPQllF8+eRBT/deD" + "\r"
+ "JBR7ga/k+wctwK/Bd4Fxp9xzeETP0l8/I+IOTagK+Dos8d8oGQUFoQJBAI4Nwpfo" + "\r"
+ "MFaLJXGY9ok45wXrcqkJgM+SN6i8hQeujXESVHYatAIL/1DgLi+u46EFD69fw0w+" + "\r" + "c7o0HLlMsYPAzJw="
+ "\r";
</pre>

2.获取公钥并加密(PHP解密密文失败)

<pre>
String source = "hello world";
PublicKey publicKey = RSAUtils.loadPublicKey(PUCLIC_KEY);
byte[] encryptByte = RSAUtils.encryptData(source.getBytes(), publicKey);
String afterencrypt = Base64Utils.encode(encryptByte);
</pre>

3.获取私钥并解密(私钥获取失败)

<pre>
PrivateKey privateKey = RSAUtils.loadPrivateKey(PRIVATE_KEY);
byte[] b1 = afterencrypt.getBytes();
String text = new String(RSAUtils.decryptData(encryptByte, privateKey));
</pre>

4.RSA算法工具类RSAUtils.class[不完善的示例代码]

<pre>
public final class RSAUtils
{
static String RSA = "RSA";
public static byte[] encryptData(byte[] data, PublicKey publicKey) throws Exception
{
try
{
Cipher cipher = Cipher.getInstance(RSA);
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return cipher.doFinal(data);
} 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");
}
}

public static byte[] decryptData(byte[] encryptedData, PrivateKey privateKey) throws Exception
{
    try
    {
        Cipher cipher = Cipher.getInstance(RSA);
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        return cipher.doFinal(encryptedData);
    } 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");  
    }         
}

public static PublicKey getPublicKey(byte[] keyBytes) throws NoSuchAlgorithmException,
        InvalidKeySpecException
{
    X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
    KeyFactory keyFactory = KeyFactory.getInstance(RSA);
    PublicKey publicKey = keyFactory.generatePublic(keySpec);
    return publicKey;
}

public static PrivateKey getPrivateKey(byte[] keyBytes) throws NoSuchAlgorithmException,
        InvalidKeySpecException
{
    PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
    KeyFactory keyFactory = KeyFactory.getInstance(RSA);
    PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
    return privateKey;
}

public static PublicKey loadPublicKey(String publicKeyStr) throws Exception
{
    try
    {
        byte[] buffer = Base64Utils.decode(publicKeyStr);
        KeyFactory keyFactory = KeyFactory.getInstance(RSA);
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
        return (RSAPublicKey) keyFactory.generatePublic(keySpec);
    } catch (NoSuchAlgorithmException e)
    {
        throw new Exception("not this suanfa");
    } catch (InvalidKeySpecException e)
    {
        throw new Exception("invalid public key");
    } catch (NullPointerException e)
    {
        throw new Exception("public key is null");
    }
}

public static PrivateKey loadPrivateKey(String privateKeyStr) throws Exception
{
    try
    {
        byte[] buffer = Base64Utils.decode(privateKeyStr);
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer);
        KeyFactory keyFactory = KeyFactory.getInstance(RSA);
        return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
    } catch (NoSuchAlgorithmException e)
    {
        throw new Exception("not this suanfa");
    } catch (InvalidKeySpecException e)
    {
        throw new Exception("invalid private key");
    } catch (NullPointerException e)
    {
        throw new Exception("private key is null");
    }
}

}
</pre>

问题解决(填坑)

1.通过java的RSA公钥加密后获得的密文,在PHP中无法解密是因为JAVA和PHP加密模式和填充方式没有统一
2.通过java提取私钥时报错私钥格式不对,这个时候需要引入第三方算法提供商BouncyCastleProvider

于是乎

针对问题一,将加密过程RSAUtils.class中的公钥加密函数encryptData()中的算法实例获取
<pre>
Cipher cipher = Cipher.getInstance(RSA);
</pre>
改成
<pre>
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
</pre>
即指定了ECB加密模式以及PKCS1Padding填充方式


针对问题二,在RSAUtils.class中的私钥加载函数loadPublicKey()中加入第三方算法提供商,以统一格式
<pre>
KeyFactory keyFactory = KeyFactory.getInstance(RSA);
</pre>
改成
<pre>
KeyFactory keyFactory = KeyFactory.getInstance(RSA, new BouncyCastleProvider());
</pre>

RSA算法工具类RSAUtils.class(完善版)

<pre>
public final class RSAUtils
{
static String RSA = "RSA";
public static byte[] encryptData(byte[] data, PublicKey publicKey) throws Exception
{
try
{
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return cipher.doFinal(data);
} 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");
}
}

public static byte[] decryptData(byte[] encryptedData, PrivateKey privateKey) throws Exception
{
    try
    {
        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        return cipher.doFinal(encryptedData);
    } 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");  
    }         
}

public static PublicKey getPublicKey(byte[] keyBytes) throws NoSuchAlgorithmException,
        InvalidKeySpecException
{
    X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
    KeyFactory keyFactory = KeyFactory.getInstance(RSA);
    PublicKey publicKey = keyFactory.generatePublic(keySpec);
    return publicKey;
}

public static PrivateKey getPrivateKey(byte[] keyBytes) throws NoSuchAlgorithmException,
        InvalidKeySpecException
{
    PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
    KeyFactory keyFactory = KeyFactory.getInstance(RSA);
    PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
    return privateKey;
}

public static PublicKey loadPublicKey(String publicKeyStr) throws Exception
{
    try
    {
        byte[] buffer = Base64Utils.decode(publicKeyStr);
        KeyFactory keyFactory = KeyFactory.getInstance(RSA, new BouncyCastleProvider());
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
        return (RSAPublicKey) keyFactory.generatePublic(keySpec);
    } catch (NoSuchAlgorithmException e)
    {
        throw new Exception("not this suanfa");
    } catch (InvalidKeySpecException e)
    {
        throw new Exception("invalid public key");
    } catch (NullPointerException e)
    {
        throw new Exception("public key is null");
    }
}

public static PrivateKey loadPrivateKey(String privateKeyStr) throws Exception
{
    try
    {
        byte[] buffer = Base64Utils.decode(privateKeyStr);
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer);
        KeyFactory keyFactory = KeyFactory.getInstance(RSA, new BouncyCastleProvider());
        return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
    } catch (NoSuchAlgorithmException e)
    {
        throw new Exception("not this suanfa");
    } catch (InvalidKeySpecException e)
    {
        throw new Exception("invalid private key");
    } catch (NullPointerException e)
    {
        throw new Exception("private key is null");
    }
}

}
</pre>


在此感谢网友的分享

1. JAVA与PHP之间的openssl交互加密
2. Java中使用OpenSSL生成的RSA公私钥进行数据加解密

最后编辑于
©著作权归作者所有,转载或内容合作请联系作者
  • 序言:七十年代末,一起剥皮案震惊了整个滨河市,随后出现的几起案子,更是在滨河造成了极大的恐慌,老刑警刘岩,带你破解...
    沈念sama阅读 216,039评论 6 498
  • 序言:滨河连续发生了三起死亡事件,死亡现场离奇诡异,居然都是意外死亡,警方通过查阅死者的电脑和手机,发现死者居然都...
    沈念sama阅读 92,223评论 3 392
  • 文/潘晓璐 我一进店门,熙熙楼的掌柜王于贵愁眉苦脸地迎上来,“玉大人,你说我怎么就摊上这事。” “怎么了?”我有些...
    开封第一讲书人阅读 161,916评论 0 351
  • 文/不坏的土叔 我叫张陵,是天一观的道长。 经常有香客问我,道长,这世上最难降的妖魔是什么? 我笑而不...
    开封第一讲书人阅读 58,009评论 1 291
  • 正文 为了忘掉前任,我火速办了婚礼,结果婚礼上,老公的妹妹穿的比我还像新娘。我一直安慰自己,他们只是感情好,可当我...
    茶点故事阅读 67,030评论 6 388
  • 文/花漫 我一把揭开白布。 她就那样静静地躺着,像睡着了一般。 火红的嫁衣衬着肌肤如雪。 梳的纹丝不乱的头发上,一...
    开封第一讲书人阅读 51,011评论 1 295
  • 那天,我揣着相机与录音,去河边找鬼。 笑死,一个胖子当着我的面吹牛,可吹牛的内容都是我干的。 我是一名探鬼主播,决...
    沈念sama阅读 39,934评论 3 416
  • 文/苍兰香墨 我猛地睁开眼,长吁一口气:“原来是场噩梦啊……” “哼!你这毒妇竟也来了?” 一声冷哼从身侧响起,我...
    开封第一讲书人阅读 38,754评论 0 271
  • 序言:老挝万荣一对情侣失踪,失踪者是张志新(化名)和其女友刘颖,没想到半个月后,有当地人在树林里发现了一具尸体,经...
    沈念sama阅读 45,202评论 1 309
  • 正文 独居荒郊野岭守林人离奇死亡,尸身上长有42处带血的脓包…… 初始之章·张勋 以下内容为张勋视角 年9月15日...
    茶点故事阅读 37,433评论 2 331
  • 正文 我和宋清朗相恋三年,在试婚纱的时候发现自己被绿了。 大学时的朋友给我发了我未婚夫和他白月光在一起吃饭的照片。...
    茶点故事阅读 39,590评论 1 346
  • 序言:一个原本活蹦乱跳的男人离奇死亡,死状恐怖,灵堂内的尸体忽然破棺而出,到底是诈尸还是另有隐情,我是刑警宁泽,带...
    沈念sama阅读 35,321评论 5 342
  • 正文 年R本政府宣布,位于F岛的核电站,受9级特大地震影响,放射性物质发生泄漏。R本人自食恶果不足惜,却给世界环境...
    茶点故事阅读 40,917评论 3 325
  • 文/蒙蒙 一、第九天 我趴在偏房一处隐蔽的房顶上张望。 院中可真热闹,春花似锦、人声如沸。这庄子的主人今日做“春日...
    开封第一讲书人阅读 31,568评论 0 21
  • 文/苍兰香墨 我抬头看了看天上的太阳。三九已至,却和暖如春,着一层夹袄步出监牢的瞬间,已是汗流浃背。 一阵脚步声响...
    开封第一讲书人阅读 32,738评论 1 268
  • 我被黑心中介骗来泰国打工, 没想到刚下飞机就差点儿被人妖公主榨干…… 1. 我叫王不留,地道东北人。 一个月前我还...
    沈念sama阅读 47,583评论 2 368
  • 正文 我出身青楼,却偏偏与公主长得像,于是被迫代替她去往敌国和亲。 传闻我的和亲对象是个残疾皇子,可洞房花烛夜当晚...
    茶点故事阅读 44,482评论 2 352

推荐阅读更多精彩内容