本文介紹了java.security.NoSuchAlgorithmException:RSA 簽名不可用的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！
問題描述
這是個例外
<上一頁>線程主"java.security.NoSuchAlgorithmException 中的異常:RSA 簽名不可用在 java.security.Signature.getInstance(Signature.java:229)在 MailClient.main(MailClient.java:52)這是我的代碼
import java.io.*;導入java.net.*；導入 java.nio.ByteBuffer；導入 java.util.*；導入java.security.*；公共類 MailClient {公共字符串 getMessage(郵件 m){返回 m.message;}公共靜態 void main(String[] args) 拋出異常 {//初始化BufferedReader br = new BufferedReader(new InputStreamReader(System.in));字符串主機 = args[0];int 端口 = Integer.parseInt(args[1]);字符串用戶 ID = args[2];而(真){//連接到服務器套接字 s = 新套接字(主機，端口)；DataInputStream dis = new DataInputStream(s.getInputStream());DataOutputStream dos = new DataOutputStream(s.getOutputStream());ObjectOutputStream oos = new ObjectOutputStream(s.getOutputStream());oos.flush();ObjectInputStream ois = new ObjectInputStream(s.getInputStream());//待辦事項:登錄//這兩行只是為了讓提供的程序運行而不會崩潰.//你可能想改變它們，當然在它們之后添加東西dos.writeUTF(userid);字符串 userPrivateKeyFileName = 用戶 ID + ".prv";//獲取創建簽名的密鑰ObjectInputStream keyIn = new ObjectInputStream(new FileInputStream(userPrivateKeyFileName));PrivateKey privateKey = (PrivateKey)keyIn.readObject();keyIn.close();//創建時間戳和隨機數long t1 = (new Date()).getTime();雙 q1 = Math.random();//ByteBuffer 稍后轉換為字節ByteBuffer bb = ByteBuffer.allocate(16);bb.putLong(t1);bb.putDouble(q1);//創建簽名，使用時間戳和隨機數作為數據簽名 sig = Signature.getInstance("RSA");sig.initSign(privateKey);sig.update(bb.array());字節[] 簽名 = sig.sign();//發送數據和簽名DataOutputStream out = new DataOutputStream(s.getOutputStream());out.writeUTF(userid);out.writeLong(t1);out.writeDouble(q1);out.writeInt(signature.length);out.write(簽名);out.flush();布爾答案 = dis.readBoolean();//通過了驗證登錄如果(回答){//接收多少條消息int numMsg = dis.readInt();System.out.println("你有 " + numMsg + " 收到的消息.");//TO DO:閱讀消息ArrayList<郵件>msg = new ArrayList<>(numMsg);for(int i=0;i) ois.readObject();}而(！msg.isEmpty()){//對于每封郵件，顯示發件人、時間戳、消息System.out.println(msg.get(0).sender);System.out.println(msg.get(0).timestamp);System.out.println(msg.get(0).message);MessageDigest md = MessageDigest.getInstance("SHA-1");md.update(msg.get(0).hashcash);字節[] 摘要 = md.digest();boolean normalMail = msg.get(0).checkHashcash(digest);如果(正常郵件){//檢查每封郵件是否為原始郵件未被修改//接收郵件System.out.println(msg.get(0).message);}else{System.out.println("這是垃圾郵件");System.out.println(msg.get(0).message);}msg.remove(0);}//發送信息System.out.println("您要發送消息[Y/N]?");String wantToSend = br.readLine();如果(！wantToSend.equals(Y")){dos.writeBoolean(false);返回 ;}dos.writeBoolean(true);System.out.println("請輸入收件人的用戶名:");字符串接收者 = br.readLine();System.out.println("請輸入您的信息:");字符串消息 = br.readLine();//TO DO:發送郵件郵件 m = 新郵件(用戶 ID、收件人、郵件)；MessageDigest md = MessageDigest.getInstance("SHA-1");md.update(m.hashcash);字節[] 摘要 = md.digest();而(m.checkHashcash(摘要)){m.setHashcash(摘要);}out.write(摘要)；out.flush();//發送時間戳和摘要到服務器長郵件時間戳 = m.timestamp.getTime();out.writeLong(mailTimestamp);oos.writeObject(m);}}}} 解決方案
如果你運行下面的代碼，你會得到一個你的Java安裝支持的簽名算法列表.
TreeSet算法=新樹集<>();對于(提供者提供者:Security.getProviders())對于(服務服務:provider.getServices())if (service.getType().equals("簽名"))算法.add(service.getAlgorithm());對于(字符串算法:算法)System.out.println(算法); 當我運行它(Windows，Java 1.8.0_65)時，我得到:
MD2withRSAMD5 和 SHA1 和 RSA帶有 RSA 的 MD5NONEwithDSANONEwithECDSANONEwithRSA帶有 DSA 的 SHA1SHA1 和 ECDSASHA1withRSASHA224 和 DSASHA224 和 ECDSASHA224 和 RSA帶有 DSA 的 SHA256SHA256 和 ECDSASHA256 和 RSASHA3??84 和 ECDSASHA3??84 和 RSASHA512 和 ECDSASHA512 和 RSA如您所見，RSA 不是有效的簽名算法.
也許 NONEwithRSA 是你所追求的?
this is exception
Exception in thread "main" java.security.NoSuchAlgorithmException: RSA Signature not available
at java.security.Signature.getInstance(Signature.java:229)
at MailClient.main(MailClient.java:52)
this is my code
import java.io.*;
import java.net.*;
import java.nio.ByteBuffer;
import java.util.*;
import java.security.*;
public class MailClient {
public String getMessage(Mail m){
return m.message;
}
public static void main(String[] args) throws Exception {
// Initialisation
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String host = args[0];
int port = Integer.parseInt(args[1]);
String userid = args[2];
while(true) {
// connect to server
Socket s = new Socket(host,port);
DataInputStream dis = new DataInputStream(s.getInputStream());
DataOutputStream dos = new DataOutputStream(s.getOutputStream());
ObjectOutputStream oos = new ObjectOutputStream(s.getOutputStream());
oos.flush();
ObjectInputStream ois = new ObjectInputStream(s.getInputStream());
// TO DO: login
// these two lines are here just to make the supplied programs run without crashing.
// You may want to change them, and certainly add things after them
dos.writeUTF(userid);
String userPrivateKeyFileName = userid + ".prv";
// Get the key to create the signature
ObjectInputStream keyIn = new ObjectInputStream(new FileInputStream(userPrivateKeyFileName));
PrivateKey privateKey = (PrivateKey)keyIn.readObject();
keyIn.close();
// create timeStamp and random number
long t1 = (new Date()).getTime();
double q1 = Math.random();
// ByteBuffer to convert to bytes later
ByteBuffer bb = ByteBuffer.allocate(16);
bb.putLong(t1);
bb.putDouble(q1);
// create signature, using timeStamp and random number as data
Signature sig = Signature.getInstance("RSA");
sig.initSign(privateKey);
sig.update(bb.array());
byte[] signature = sig.sign();
// send data and signature
DataOutputStream out = new DataOutputStream(s.getOutputStream());
out.writeUTF(userid);
out.writeLong(t1);
out.writeDouble(q1);
out.writeInt(signature.length);
out.write(signature);
out.flush();
boolean answer = dis.readBoolean();
//passed the verifyLogin
if (answer)
{
// receive how many messages
int numMsg = dis.readInt();
System.out.println("You have " + numMsg + " incoming messages.");
// TO DO: read messages
ArrayList<Mail> msg = new ArrayList<>(numMsg);
for(int i=0;i<numMsg;i++){
//@Unchecked
msg = (ArrayList<Mail>) ois.readObject();
}
while(!msg.isEmpty()){
//for each mail, display sender,timestamp,message
System.out.println(msg.get(0).sender);
System.out.println(msg.get(0).timestamp);
System.out.println(msg.get(0).message);
MessageDigest md = MessageDigest.getInstance("SHA-1");
md.update(msg.get(0).hashcash);
byte[] digest = md.digest();
boolean normalMail = msg.get(0).checkHashcash(digest);
if(normalMail){
//check each mail is original that it isn't modified
//receive mail
System.out.println(msg.get(0).message);
}
else{System.out.println("it's a spam message.");
System.out.println(msg.get(0).message);
}
msg.remove(0);
}
// send messages
System.out.println("Do you want to send a message [Y/N]?");
String wantToSend = br.readLine();
if (!wantToSend.equals("Y")) {
dos.writeBoolean(false);
return ;
}
dos.writeBoolean(true);
System.out.println("Enter userid of recipient:");
String recipient = br.readLine();
System.out.println("Type your message:");
String message = br.readLine();
// TO DO: send mail
Mail m = new Mail(userid, recipient, message);
MessageDigest md = MessageDigest.getInstance("SHA-1");
md.update(m.hashcash);
byte[] digest = md.digest();
while(m.checkHashcash(digest)){
m.setHashcash(digest);
}
out.write(digest);
out.flush();
// send timeStamp and digest to server
long mailTimestamp = m.timestamp.getTime();
out.writeLong(mailTimestamp);
oos.writeObject(m);
}
}
}
}
解決方案
If you run the following code, you will get a list of signature algorithms supported by your Java installation.
TreeSet<String> algorithms = new TreeSet<>();
for (Provider provider : Security.getProviders())
for (Service service : provider.getServices())
if (service.getType().equals("Signature"))
algorithms.add(service.getAlgorithm());
for (String algorithm : algorithms)
System.out.println(algorithm);
When I run it (Windows, Java 1.8.0_65), I get:
MD2withRSA
MD5andSHA1withRSA
MD5withRSA
NONEwithDSA
NONEwithECDSA
NONEwithRSA
SHA1withDSA
SHA1withECDSA
SHA1withRSA
SHA224withDSA
SHA224withECDSA
SHA224withRSA
SHA256withDSA
SHA256withECDSA
SHA256withRSA
SHA384withECDSA
SHA384withRSA
SHA512withECDSA
SHA512withRSA
As you can see, RSA is not a valid signature algorithm.
Maybe NONEwithRSA is what you're after?
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