java rsa 128_java – RSA解密错误 – IllegalBlockSizeException：数据不得超过128个字节

深藏阁楼爱情的钟 2022-11-03 11:25 300阅读 0赞

我现在正在制作RSA消息认证软件.过程如下：

>使用A的私钥(1024位)对邮件进行签名

>使用A的公钥验证邮件(1024位)

\#1代码(如下)工作正常并生成以下结果：

5554c9a9f6838b6cf40d9dbfbab3d90ea27aa6434ed095d289c13c2624617993ad99161ac265276d150510c176341d8ab8600d08b7353286d465e6bd3370a6fd8dd3ffb82916f612fd6dcee5e654ed801cfca6b6d2d5d6dc99ff7921b615abdf62eb67db1f71e6a6ea70012fd35e7cefa1a8d3aab7614c47746cfe1fc2bc875b

但是\#2代码显示以下错误：

javax.crypto.IllegalBlockSizeException: Data must not be longer than 128 bytes

我认为\#1 Cipher密码中的行= Cipher.getInstance(“RSA / ECB / PKCS1Padding”);

生成2048位(256字节)的结果.也许这就是问题……记住我使用1024位私钥.

那么\#1代码如何生成128字节的结果呢？

1. SignMail.java

public class SignMail \{

static \{

Security.addProvider(new org.spongycastle.jce.provider.BouncyCastleProvider());

public static String sign(String userOriginalMessage) throws Exception \{

PEMReader userPrivateKey = new PEMReader(

new InputStreamReader(

new FileInputStream(Environment.getExternalStorageDirectory()+"/pkcs10priv.key")));

KeyPair keyPair = (KeyPair)userPrivateKey.readObject();

byte\[\] cipherText;

//modified by JEON 20130817

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

//encrypt the message using private key

cipher.init(Cipher.ENCRYPT\_MODE, keyPair.getPrivate());

cipherText = cipher.doFinal(userOriginalMessage.getBytes());

return new String(Hex.encode(cipherText));

2. UserSMSVerifier.java

public class UserSMSVerifier \{

static String signedMail;

static \{

Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

public static String messageGenarator(

String UserCert,

String origninalMessage

) throws Exception\{

InputStream userCertStream = new ByteArrayInputStream(UserCert.getBytes("UTF-8"));

PEMReader userCerti = new PEMReader(

new InputStreamReader(

userCertStream));

//KeyPair userPrivate = (KeyPair)userPrivateKey.readObject();

X509Certificate userCert = (X509Certificate)userCerti.readObject();

byte\[\] dectyptedText = null;

// decrypt the text using the private key

//modified by JEON 20130817

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

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

cipher.init(Cipher.DECRYPT\_MODE, userCert.getPublicKey());

dectyptedText = cipher.doFinal(origninalMessage.getBytes());

String result = new String(dectyptedText, Charset.forName("UTF-8"));

return result;

\#2代码由以下JSP执行

\#3 messageVeri.JSP

request.setCharacterEncoding("euc-kr");

String userID = request.getParameter("sender");

String encryptedSMS = request.getParameter("encryptedSMS");

//String sql = "select user\_id, user\_pw from testca.testca\_init where user\_id=? and user\_pw=?";

//String sql = "update testca.testca\_init set pkcs10request = '"+pkcs10request\_new+"' where user\_id='user1'";

String sql = "select \* from testca.testca\_init where user\_id='" + userID + "'";

Class.forName("com.mysql.jdbc.Driver");

Connection conn = null;

PreparedStatement pstmt = null;

Statement stmt = null;

ResultSet rs = null;

String jdbcDriver = "jdbc:mysql://localhost:3306/";

String dbUser = "root";

String dbPass = "fo.......t";

try\{

conn = DriverManager.getConnection(jdbcDriver, dbUser, dbPass);

stmt = conn.createStatement();

//stmt.executeUpdate(sql);

rs=stmt.executeQuery(sql);

while(rs.next())\{

//rs=stmt.executeQuery(sql);

String userCertificate=rs.getString("certificate");

UserSMSVerifier.messageGenarator(userCertificate, encryptedSMS);

\}catch(Exception ex)\{out.print("Error 2: " +ex);\}

/\*

if(rs.next())

//session.setAttribute("userID", userID);

out.print("Insert Succeed!");

out.println();

//out.print("Welcome!" + " " + session.getAttribute("userID"));

else

out.print("failed to login!");

//session.invalidate();

\*/

java rsa 128_java – RSA解密错误 – IllegalBlockSizeException：数据不得超过128个字节

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