「javarsa生成公钥」简述rsa的公钥生成算法
本篇文章给大家谈谈javarsa生成公钥，以及简述rsa的公钥生成算法对应的知识点，希望对各位有所帮助，不要忘了收藏本站喔。
本文目录一览：
给一个java简单随机生成rsa公钥私钥的算法代码
#!/usr/bin/perl -w
#RSA 计算过程学习程序编写的测试程序
#watercloud 2003-8-12
#
use strict;
use Math::BigInt;
my %RSA_CORE = (n=2773,e=63,d=847); #p=47,q=59
my $N=new Math::BigInt($RSA_CORE{n});
my $E=new Math::BigInt($RSA_CORE{e});
my $D=new Math::BigInt($RSA_CORE{d});
print "N=$N D=$D E=$E\n";
sub RSA_ENCRYPT
{
my $r_mess = shift @_;
my ($c,$i,$M,$C,$cmess);
for($i=0;$i length($$r_mess);$i++)
{
$c=ord(substr($$r_mess,$i,1));
$M=Math::BigInt-new($c);
$C=$M-copy(); $C-bmodpow($D,$N);
$c=sprintf "%03X",$C;
$cmess.=$c;
}
return \$cmess;
}
sub RSA_DECRYPT
{
my $r_mess = shift @_;
my ($c,$i,$M,$C,$dmess);
for($i=0;$i length($$r_mess);$i+=3)
{
$c=substr($$r_mess,$i,3);
$c=hex($c);
$M=Math::BigInt-new($c);
$C=$M-copy(); $C-bmodpow($E,$N);
$c=chr($C);
$dmess.=$c;
}
return \$dmess;
}
my $mess="RSA 娃哈哈哈～～～";
$mess=$ARGV[0] if @ARGV = 1;
print "原始串：",$mess,"\n";
my $r_cmess = RSA_ENCRYPT(\$mess);
print "加密串：",$$r_cmess,"\n";
my $r_dmess = RSA_DECRYPT($r_cmess);
print "解密串：",$$r_dmess,"\n";
#EOF
Java 第三方公钥 RSA加密求助
下面是RSA加密代码。
/**
* RSA算法，实现数据的加密解密。
* @author ShaoJiang
*
*/
public class RSAUtil {
private static Cipher cipher;
static{
try {
cipher = Cipher.getInstance("RSA");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
}
}
/**
* 生成密钥对
* @param filePath 生成密钥的路径
* @return
*/
public static MapString,String generateKeyPair(String filePath){
try {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
// 密钥位数
keyPairGen.initialize(1024);
// 密钥对
KeyPair keyPair = keyPairGen.generateKeyPair();
// 公钥
PublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
// 私钥
PrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
//得到公钥字符串
String publicKeyString = getKeyString(publicKey);
//得到私钥字符串
String privateKeyString = getKeyString(privateKey);
//将密钥对写入到文件 想学习更多加我q u N 前面是二五七 中间是014后面是001
FileWriter pubfw = new FileWriter(filePath+"/publicKey.keystore");
FileWriter prifw = new FileWriter(filePath+"/privateKey.keystore");
BufferedWriter pubbw = new BufferedWriter(pubfw);
BufferedWriter pribw = new BufferedWriter(prifw);
pubbw.write(publicKeyString);
pribw.write(privateKeyString);
pubbw.flush();
pubbw.close();
pubfw.close();
pribw.flush();
pribw.close();
prifw.close();
//将生成的密钥对返回
MapString,String map = new HashMapString,String();
map.put("publicKey",publicKeyString);
map.put("privateKey",privateKeyString);
return map;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 得到公钥
*
* @param key
* 密钥字符串（经过base64编码）
* @throws Exception
*/
public static PublicKey getPublicKey(String key) throws Exception {
byte[] keyBytes;
keyBytes = (new BASE64Decoder()).decodeBuffer(key);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey publicKey = keyFactory.generatePublic(keySpec);
return publicKey;
}
/**
* 得到私钥
*
* @param key
* 密钥字符串（经过base64编码）
* @throws Exception
*/
public static PrivateKey getPrivateKey(String key) throws Exception {
byte[] keyBytes;
keyBytes = (new BASE64Decoder()).decodeBuffer(key);
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
return privateKey;
}
/**
* 得到密钥字符串（经过base64编码）
*
* @return
*/
public static String getKeyString(Key key) throws Exception {
byte[] keyBytes = key.getEncoded();
String s = (new BASE64Encoder()).encode(keyBytes);
return s;
}
/**
* 使用公钥对明文进行加密，返回BASE64编码的字符串
* @param publicKey
* @param plainText
* @return
*/
public static String encrypt(PublicKey publicKey,String plainText){
try {
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] enBytes = cipher.doFinal(plainText.getBytes());
return (new BASE64Encoder()).encode(enBytes);
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
}
return null;
}
/**
* 使用keystore对明文进行加密
* @param publicKeystore 公钥文件路径
* @param plainText 明文
* @return
*/
public static String encrypt(String publicKeystore,String plainText){
try {
FileReader fr = new FileReader(publicKeystore);
BufferedReader br = new BufferedReader(fr);
String publicKeyString="";
String str;
while((str=br.readLine())!=null){
publicKeyString+=str;
}
br.close();
fr.close();
cipher.init(Cipher.ENCRYPT_MODE,getPublicKey(publicKeyString));
byte[] enBytes = cipher.doFinal(plainText.getBytes());
return (new BASE64Encoder()).encode(enBytes);
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 使用私钥对明文密文进行解密
* @param privateKey
* @param enStr
* @return
*/
public static String decrypt(PrivateKey privateKey,String enStr){
try {
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] deBytes = cipher.doFinal((new BASE64Decoder()).decodeBuffer(enStr));
return new String(deBytes);
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 使用keystore对密文进行解密
* @param privateKeystore 私钥路径
* @param enStr 密文
* @return
*/
public static String decrypt(String privateKeystore,String enStr){
try {
FileReader fr = new FileReader(privateKeystore);
BufferedReader br = new BufferedReader(fr);
String privateKeyString="";
String str;
while((str=br.readLine())!=null){
privateKeyString+=str;
}
br.close();
fr.close();
cipher.init(Cipher.DECRYPT_MODE, getPrivateKey(privateKeyString));
byte[] deBytes = cipher.doFinal((new BASE64Decoder()).decodeBuffer(enStr));
return new String(deBytes);
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
java生成的rsa公钥 能在python上使用吗
肯定可以，这个跟语言是无关的
Python上RSA加密的库挺多的，最开始使用的是rsa，因为比较简单嘛！测试的时候也是用 python模拟App的访问，顺利通过！
然而App开发者反馈，python测试脚本没法移植到java上，因为java的加密解密模块需要更加精细的算法细节指定，否则java加密过的数据python是解不出来的。
当初就是因为rsa模块简单，不需要注重细节才选的，自己又不是专业搞加密解密的。没办法了，只能硬着头皮，捋了一遍RSA的加密原理。网上还是有比较多的讲述比较好的文章，比如RSA算法原理
原理是懂了，但具体到python和java的区别上，还是一头雾水。最终python的RSA模块换成Crypto，因为支持的参数比较多。搜了很多网站讲的都不是很详细，stackflow上有几篇还可以，借鉴了一下，最后测试通过了。还是直接上代码吧。
Java代码
//下面这行指定了RSA算法的细节，必须更python对应
private static String RSA_CONFIGURATION = "RSA/ECB/OAEPWithSHA-256AndMGF1Padding";
//这个貌似需要安装指定的provider模块，这里没有使用
private static String RSA_PROVIDER = "BC";
//解密 Key：私钥
public static String decrypt(Key key, String encryptedString){
try {
Cipher c = Cipher.getInstance(RSA_CONFIGURATION);
c.init(Cipher.DECRYPT_MODE, key, new OAEPParameterSpec("SHA-256", "MGF1", MGF1ParameterSpec.SHA256,
PSource.PSpecified.DEFAULT));
byte[] decodedBytes;
decodedBytes = c.doFinal(Base64.decode(encryptedString.getBytes("UTF-8")));
return new String(decodedBytes, "UTF-8");
} catch (IllegalBlockSizeException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (BadPaddingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Base64DecodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchPaddingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvalidKeyException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvalidAlgorithmParameterException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
//加密 Key一般是公钥
public static String encrypt(Key key, String toBeEncryptedString){
try {
Cipher c = Cipher.getInstance(RSA_CONFIGURATION);
c.init(Cipher.ENCRYPT_MODE, key, new OAEPParameterSpec("SHA-256", "MGF1", MGF1ParameterSpec.SHA256,
PSource.PSpecified.DEFAULT));
byte[] encodedBytes;
encodedBytes = c.doFinal(toBeEncryptedString.getBytes("UTF-8"));
return Base64.encode(encodedBytes);
} catch (IllegalBlockSizeException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (BadPaddingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchPaddingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvalidKeyException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvalidAlgorithmParameterException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
//通过Pem格式的字符串（PKCS8）生成私钥，base64是去掉头和尾的b64编码的字符串
//Pem格式私钥一般有2种规范：PKCS8和PKCS1.注意java在生成私钥时的不同
static PrivateKey generatePrivateKeyFromPKCS8(String base64)
{
byte[] privateKeyBytes;
try {
privateKeyBytes = Base64.decode(base64.getBytes("UTF-8"));
KeyFactory kf = KeyFactory.getInstance("RSA");
PKCS8EncodedKeySpec ks = new PKCS8EncodedKeySpec(privateKeyBytes);
PrivateKey privateKey = kf.generatePrivate(ks);
return privateKey;
} catch (Base64DecodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvalidKeySpecException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
//通过Pem格式的字符串（PKCS1）生成私钥，base64是去掉头和尾的b64编码的字符串
static PrivateKey generatePrivateKeyFromPKCS1(String base64)
{
byte[] privateKeyBytes;
try {
privateKeyBytes = Base64.decode(base64.getBytes("UTF-8"));
KeyFactory kf = KeyFactory.getInstance("RSA");
X509EncodedKeySpec ks = new X509EncodedKeySpec(privateKeyBytes);
PrivateKey privateKey = kf.generatePrivate(ks);
return privateKey;
} catch (Base64DecodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvalidKeySpecException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
//通过Pem格式的字符串（PKCS1）生成公钥，base64是去掉头和尾的b64编码的字符串
//Pem格式公钥一般采用PKCS1格式
static PublicKey generatePublicKeyFromPKCS1(String base64)
{
byte[] publicKeyBytes;
try {
publicKeyBytes = Base64.decode(base64.getBytes("UTF-8"));
KeyFactory kf = KeyFactory.getInstance("RSA");
X509EncodedKeySpec ks = new X509EncodedKeySpec(publicKeyBytes);
PublicKey publicKey = kf.generatePublic(ks);
return publicKey;
} catch (Base64DecodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvalidKeySpecException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
//通过modulus和exponent生成公钥
//参数含义就是RSA算法里的意思
public static RSAPublicKey getPublicKey(String modulus, String exponent) {
try {
BigInteger b1 = new BigInteger(modulus);
BigInteger b2 = new BigInteger(exponent);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
RSAPublicKeySpec keySpec = new RSAPublicKeySpec(b1, b2);
return (RSAPublicKey) keyFactory.generatePublic(keySpec);
} catch (Exception e) {
e.printStackTrace();
return null;
}
} 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169
Python 代码
from Config import config
from Crypto.Hash import SHA256
from Crypto.PublicKey import RSA
from Crypto.Cipher import PKCS1_OAEP
key = RSA.generate(1024)
pubkey = key.publickey().key
def Decrypt(prikey,data):
try:
cipher = PKCS1_OAEP.new(prikey, hashAlgo=SHA256)
return cipher.decrypt(data)
except:
traceback.print_exc()
return None
def Encrypt(pubkey,data):
try:
cipher = PKCS1_OAEP.new(pubkey, hashAlgo=SHA256)
return cipher.encrypt(data)
except:
traceback.print_exc()
return None
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总结
主要是对RSA算法不是很熟悉，其中很多术语不懂，导致跟java里的加密模块的函数和类对应不上。
RSA算法的细节到现在也是一知半解，但真的没时间去深入学习了。
关于javarsa生成公钥和简述rsa的公钥生成算法的介绍到此就结束了，不知道你从中找到你需要的信息了吗 ？如果你还想了解更多这方面的信息，记得收藏关注本站。
发布于：2022-12-01，除非注明，否则均为原创文章，转载请注明出处。