简单完整的代码，通过这个代码你将对rsa加密算法在java中的实现方法有一个初步的了解，这个类，你可以直接使用，水平高的，就自己修改完善下代码。
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package security;
import java.security.*;
import java.security.spec.*;
import java.security.interfaces.*;
import javax.crypto.spec.*;
import javax.crypto.interfaces.*;
import java.io.*;
import java.math.*;
public class rsademo {
public rsademo() {
}
public static void generatekey() {
try {
keypairgenerator kpg = keypairgenerator.getinstance("rsa");
kpg.initialize(1024);
keypair kp = kpg.genkeypair();
publickey pbkey = kp.getpublic();
privatekey prkey = kp.getprivate();
// 保存公钥
fileoutputstream f1 = new fileoutputstream("pubkey.dat");
objectoutputstream b1 = new objectoutputstream(f1);
b1.writeobject(pbkey);
// 保存私钥
fileoutputstream f2 = new fileoutputstream("privatekey.dat");
objectoutputstream b2 = new objectoutputstream(f2);
b2.writeobject(prkey);
} catch (exception e) {
}
}
public static void encrypt() throws exception {
string s = "hello world!";
// 获取公钥及参数e,n
fileinputstream f = new fileinputstream("pubkey.dat");
objectinputstream b = new objectinputstream(f);
rsapublickey pbk = (rsapublickey) b.readobject();
biginteger e = pbk.getpublicexponent();
biginteger n = pbk.getmodulus();
system.out.println("e= " + e);
system.out.println("n= " + n);
// 获取明文m
byte ptext[] = s.getbytes("utf-8");
biginteger m = new biginteger(ptext);
// 计算密文c
biginteger c = m.modpow(e, n);
system.out.println("c= " + c);
// 保存密文
string cs = c.tostring();
bufferedwriter out =
new bufferedwriter(
new outputstreamwriter(new fileoutputstream("encrypt.dat")));
out.write(cs, 0, cs.length());
out.close();
}
public static void decrypt() throws exception {
// 读取密文
bufferedreader in =
new bufferedreader(
new inputstreamreader(new fileinputstream("encrypt.dat")));
string ctext = in.readline();
biginteger c = new biginteger(ctext);
// 读取私钥
fileinputstream f = new fileinputstream("privatekey.dat");
objectinputstream b = new objectinputstream(f);
rsaprivatekey prk = (rsaprivatekey) b.readobject();
biginteger d = prk.getprivateexponent();
// 获取私钥参数及解密
biginteger n = prk.getmodulus();
system.out.println("d= " + d);
system.out.println("n= " + n);
biginteger m = c.modpow(d, n);
// 显示解密结果
system.out.println("m= " + m);
byte[] mt = m.tobytearray();
system.out.println("plaintext is ");
for (int i = 0; i < mt.length; i++) {
system.out.print((char) mt[i]);
}
}
public static void main(string args[]) {
try {
generatekey();
encrypt();
decrypt();
} catch (exception e) {
system.out.println(e.tostring());
}
}
}
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