com.founder.sdk.utils.RSAEncodeUtil Maven / Gradle / Ivy
package com.founder.sdk.utils;
import org.apache.commons.codec.binary.Base64;
import javax.crypto.Cipher;
import java.io.ByteArrayOutputStream;
import java.security.*;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
public class RSAEncodeUtil {
/**
* RSA最大加密明文大小
*/
private static final int MAX_ENCRYPT_BLOCK = 117;
/**
* RSA最大解密密文大小
*/
private static final int MAX_DECRYPT_BLOCK = 128;
//public static String privateKey = "MIICeAIBADANBgkqhkiG9w0BAQEFAASCAmIwggJeAgEAAoGBAKx1bpyh6A12DukVrQxhZbmaSmeaS335leLTY2xXRTGfshh0X6f9roPu+oSQFNq0ITMAyeNQ6XBhrNOmvwV+WZAVreaRTxwD91/05VObQVbNBXhd5ebSws5CUDd/oUWMejrfjexOYo2XjIpO4goBZaSjdEH+DtlBbdqkM/OtwypjAgMBAAECgYA7PrRbFrvTNAV3ST0DjcoWcsywvq7EfiNhouD67RgWLhhOklvyKBH1vPlO5PhlEZB+Jv00HC21r7hhlVz2FCvL5US6itKUE0U6rjV1XoUTF8a/4/sawYRBSYWeln0GvCbvsEN4qNSVdjjhGHt+N7nf1BcIaF9PJRPOhjnqWuMU0QJBANuhmRhpjv6YxQjfJJI/dBfFv+qvZ6PMY7OSRv+UeSbzaQpRdSLOno8Dti72R959VEf2idZ10gP67njKS/Yl/80CQQDJBCP/PXtOoKWSQyKv1VEbnBmR/lExebF3w0hNtHT3GR3vTrGRFNQk0ieXyMBZQiXDXTGIRlLChVMqP3aWMMLvAkEAt4IQDsu0BJnUl5MKVX/bGjnKHuar67pM268uz0FY8OiULWDeRFTrOodZY2e3qPiCwRYHGT+cWGMDeb1dNq+NSQJBAJcnzu3CzLNOZ9K5Ox8feDMbybqXk3RxvvqA1SDhXsbkkzb9ZNbk47WgdfdUFRfJft4OeQ2xW9A8M1JkkIbVue8CQQCeMWH5CZ3fbfTJCRAlZ/08K9mirqUShAs0x3tkC31FQOOQY6qdrnmzQKsihhb++9Vtrjkjnr5YgWnwMcKBlknb";
//private static String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCsdW6coegNdg7pFa0MYWW5mkpnmkt9+ZXi02NsV0Uxn7IYdF+n/a6D7vqEkBTatCEzAMnjUOlwYazTpr8FflmQFa3mkU8cA/df9OVTm0FWzQV4XeXm0sLOQlA3f6FFjHo6343sTmKNl4yKTuIKAWWko3RB/g7ZQW3apDPzrcMqYwIDAQAB";
/**
* 获取密钥对
*
* @return 密钥对
*/
public static KeyPair getKeyPair() throws Exception {
KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
generator.initialize(1024);
return generator.generateKeyPair();
}
/**
* 获取私钥
*
* @param privateKey 私钥字符串
* @return
*/
public static PrivateKey getPrivateKey(String privateKey) throws Exception {
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
byte[] decodedKey = Base64.decodeBase64(privateKey);
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(decodedKey);
return keyFactory.generatePrivate(keySpec);
}
/**
* 获取公钥
*
* @param publicKey 公钥字符串
* @return
*/
public static PublicKey getPublicKey(String publicKey) throws Exception {
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
byte[] decodedKey = Base64.decodeBase64(publicKey.getBytes());
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(decodedKey);
return keyFactory.generatePublic(keySpec);
}
/**
* RSA加密
*
* @param data 待加密数据
* @param publicKey 公钥
* @return
*/
public static String encrypt(String data, PublicKey publicKey) throws Exception {
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
int inputLen = data.getBytes().length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offset = 0;
byte[] cache;
int i = 0;
// 对数据分段加密
while (inputLen - offset > 0) {
if (inputLen - offset > MAX_ENCRYPT_BLOCK) {
cache = cipher.doFinal(data.getBytes(), offset, MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(data.getBytes(), offset, inputLen - offset);
}
out.write(cache, 0, cache.length);
i++;
offset = i * MAX_ENCRYPT_BLOCK;
}
byte[] encryptedData = out.toByteArray();
out.close();
// 获取加密内容使用base64进行编码,并以UTF-8为标准转化成字符串
// 加密后的字符串
return new String(Base64.encodeBase64String(encryptedData));
}
/**
* RSA解密
*
* @param data 待解密数据
* @param privateKey 私钥
* @return
*/
public static String decrypt(String data, PrivateKey privateKey) throws Exception {
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] dataBytes = Base64.decodeBase64(data);
int inputLen = dataBytes.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offset = 0;
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - offset > 0) {
if (inputLen - offset > MAX_DECRYPT_BLOCK) {
cache = cipher.doFinal(dataBytes, offset, MAX_DECRYPT_BLOCK);
} else {
cache = cipher.doFinal(dataBytes, offset, inputLen - offset);
}
out.write(cache, 0, cache.length);
i++;
offset = i * MAX_DECRYPT_BLOCK;
}
byte[] decryptedData = out.toByteArray();
out.close();
// 解密后的内容
return new String(decryptedData, "UTF-8");
}
public static void main(String args[])
{
int a=10;
int b[][];
b=new int[a][];
for(int i=1;i<=10;i++)
{
b[i-1]=new int[i];
}
for(int j=0;j<10;j++)
{
for(int k=0;k<=j;k++)
{
if(j==0||k==0||k==j)
{
b[j][k]=1;
continue;
}
else
{
b[j][k]=b[j-1][k-1]+b[j-1][k];
}
}
}
for(int m=0;m<10;m++)
{
for(int n=0;n<=m;n++)
{
System.out.print(b[m][n]+" ");
}
System.out.println(" ");
}
}
}