Java实现RSA加密解密、数字签名及验签

RSA公钥加密算法是1977年由罗纳德-李维斯特（Ron Rivest）、阿迪-萨莫尔（Adi Shamir）和伦纳德-阿德曼（Leonard Adleman）一起提出的。当时他们三人都在麻省理工学院工作。RSA就是他们三人姓氏开头字母拼在一起组成的。

RSA是目前最有影响力的公钥加密算法，它能够抵抗到目前为止已知的绝大多数密码攻击，已被ISO推荐为公钥数据加密算法。

RSA算法是一种非对称密码算法，所谓非对称，就是指该算法需要一对密钥，使用其中一个加密，则需要用另一个才能解密。另外一个rsa加密明文的长度是有限制的，如果要进行长数据加密需要进行分段加密。

Base64类：

package rsa;

public final class Base64 {

static private final int BASELENGTH = 128;

static private final int LOOKUPLENGTH = 64;

static private final int TWENTYFOURBITGROUP = 24;

static private final int EIGHTBIT = 8;

static private final int SIXTEENBIT = 16;

static private final int FOURBYTE = 4;

static private final int SIGN = -128;

static private final char PAD = '=';

static private final boolean fDebug = false;

static final private byte[] base64Alphabet = new byte[BASELENGTH];

static final private char[] lookUpBase64Alphabet = new char[LOOKUPLENGTH];

static {

for (int i = 0; i < BASELENGTH; ++i) {

base64Alphabet[i] = -1;

}

for (int i = 'Z'; i >= 'A'; i--) {

base64Alphabet[i] = (byte) (i - 'A');

}

for (int i = 'z'; i >= 'a'; i--) {

base64Alphabet[i] = (byte) (i - 'a' + 26);

}

for (int i = '9'; i >= '0'; i--) {

base64Alphabet[i] = (byte) (i - '0' + 52);

}

base64Alphabet['+'] = 62;

base64Alphabet['/'] = 63;

for (int i = 0; i <= 25; i++) {

lookUpBase64Alphabet[i] = (char) ('A' + i);

}

for (int i = 26, j = 0; i <= 51; i++, j++) {

lookUpBase64Alphabet[i] = (char) ('a' + j);

}

for (int i = 52, j = 0; i <= 61; i++, j++) {

lookUpBase64Alphabet[i] = (char) ('0' + j);

}

lookUpBase64Alphabet[62] = (char) '+';

lookUpBase64Alphabet[63] = (char) '/';

}

private static boolean isWhiteSpace(char octect) {

return (octect == 0x20 || octect == 0xd || octect == 0xa || octect == 0x9);

}

private static boolean isPad(char octect) {

return (octect == PAD);

}

private static boolean isData(char octect) {

return (octect < BASELENGTH && base64Alphabet[octect] != -1);

}

/**

* Encodes hex octects into Base64

*

* @param binaryData Array containing binaryData

* @return Encoded Base64 array

*/

public static String encode(byte[] binaryData) {

if (binaryData == null) {

return null;

}

int lengthDataBits = binaryData.length * EIGHTBIT;

if (lengthDataBits == 0) {

return "";

}

int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;

int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;

int numberQuartet = fewerThan24bits != 0 ? numberTriplets + 1 : numberTriplets;

char encodedData[] = null;

encodedData = new char[numberQuartet * 4];

byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;

int encodedIndex = 0;

int dataIndex = 0;

if (fDebug) {

System.out.println("number of triplets = " + numberTriplets);

}

for (int i = 0; i < numberTriplets; i++) {

b1 = binaryData[dataIndex++];

b2 = binaryData[dataIndex++];

b3 = binaryData[dataIndex++];

if (fDebug) {

System.out.println("b1= " + b1 + ", b2= " + b2 + ", b3= " + b3);

}

l = (byte) (b2 & 0x0f);

k = (byte) (b1 & 0x03);

byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);

byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);

byte val3 = ((b3 & SIGN) == 0) ? (byte) (b3 >> 6) : (byte) ((b3) >> 6 ^ 0xfc);

if (fDebug) {

System.out.println("val2 = " + val2);

System.out.println("k4 = " + (k << 4));

System.out.println("vak = " + (val2 | (k << 4)));

}

encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];

encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)];

encodedData[encodedIndex++] = lookUpBase64Alphabet[(l << 2) | val3];

encodedData[encodedIndex++] = lookUpBase64Alphabet[b3 & 0x3f];

}

// form integral number of 6-bit groups

if (fewerThan24bits == EIGHTBIT) {

b1 = binaryData[dataIndex];

k = (byte) (b1 & 0x03);

if (fDebug) {

System.out.println("b1=" + b1);

System.out.println("b1<<2 = " + (b1 >> 2));

}

byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);

encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];

encodedData[encodedIndex++] = lookUpBase64Alphabet[k << 4];

encodedData[encodedIndex++] = PAD;

encodedData[encodedIndex++] = PAD;

} else if (fewerThan24bits == SIXTEENBIT) {

b1 = binaryData[dataIndex];

b2 = binaryData[dataIndex + 1];

l = (byte) (b2 & 0x0f);

k = (byte) (b1 & 0x03);

byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);

byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);

encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];

encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)];

encodedData[encodedIndex++] = lookUpBase64Alphabet[l << 2];

encodedData[encodedIndex++] = PAD;

}

return new String(encodedData);

}

/**

* Decodes Base64 data into octects

*

* @param encoded string containing Base64 data

* @return Array containind decoded data.

*/

public static byte[] decode(String encoded) {

if (encoded == null) {

return null;

}

char[] base64Data = encoded.toCharArray();

// remove white spaces

int len = removeWhiteSpace(base64Data);

if (len % FOURBYTE != 0) {

return null;//should be divisible by four

}

int numberQuadruple = (len / FOURBYTE);

if (numberQuadruple == 0) {

return new byte[0];

}

byte decodedData[] = null;

byte b1 = 0, b2 = 0, b3 = 0, b4 = 0;

char d1 = 0, d2 = 0, d3 = 0, d4 = 0;

int i = 0;

int encodedIndex = 0;

int dataIndex = 0;

decodedData = new byte[(numberQuadruple) * 3];

for (; i < numberQuadruple - 1; i++) {

if (!isData((d1 = base64Data[dataIndex++])) || !isData((d2 = base64Data[dataIndex++]))

|| !isData((d3 = base64Data[dataIndex++]))

|| !isData((d4 = base64Data[dataIndex++]))) {

return null;

}//if found "no data" just return null

b1 = base64Alphabet[d1];

b2 = base64Alphabet[d2];

b3 = base64Alphabet[d3];

b4 = base64Alphabet[d4];

decodedData[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);

decodedData[encodedIndex++] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));

decodedData[encodedIndex++] = (byte) (b3 << 6 | b4);

}

if (!isData((d1 = base64Data[dataIndex++])) || !isData((d2 = base64Data[dataIndex++]))) {

return null;//if found "no data" just return null

}

b1 = base64Alphabet[d1];

b2 = base64Alphabet[d2];

d3 = base64Data[dataIndex++];

d4 = base64Data[dataIndex++];

if (!isData((d3)) || !isData((d4))) {//Check if they are PAD characters

if (isPad(d3) && isPad(d4)) {

if ((b2 & 0xf) != 0)//last 4 bits should be zero

{

return null;

}

byte[] tmp = new byte[i * 3 + 1];

System.arraycopy(decodedData, 0, tmp, 0, i * 3);

tmp[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);

return tmp;

} else if (!isPad(d3) && isPad(d4)) {

b3 = base64Alphabet[d3];

if ((b3 & 0x3) != 0)//last 2 bits should be zero

{

return null;

}

byte[] tmp = new byte[i * 3 + 2];

System.arraycopy(decodedData, 0, tmp, 0, i * 3);

tmp[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);

tmp[encodedIndex] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));

return tmp;

} else {

return null;

}

} else { //No PAD e.g 3cQl

b3 = base64Alphabet[d3];

b4 = base64Alphabet[d4];

decodedData[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);

decodedData[encodedIndex++] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));

decodedData[encodedIndex++] = (byte) (b3 << 6 | b4);

}

return decodedData;

}

/**

* remove WhiteSpace from MIME containing encoded Base64 data.

*

* @param data the byte array of base64 data (with WS)

* @return the new length

*/

private static int removeWhiteSpace(char[] data) {

if (data == null) {

return 0;

}

// count characters that's not whitespace

int newSize = 0;

int len = data.length;

for (int i = 0; i < len; i++) {

if (!isWhiteSpace(data[i])) {

data[newSize++] = data[i];

}

}

return newSize;

}

}

RSAEncrypt 类：

package rsa;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.security.InvalidKeyException;

import java.security.KeyFactory;

import java.security.KeyPair;

import java.security.KeyPairGenerator;

import java.security.NoSuchAlgorithmException;

import java.security.SecureRandom;

import java.security.interfaces.RSAPrivateKey;

import java.security.interfaces.RSAPublicKey;

import java.security.spec.InvalidKeySpecException;

import java.security.spec.PKCS8EncodedKeySpec;

import java.security.spec.X509EncodedKeySpec;

import javax.crypto.BadPaddingException;

import javax.crypto.Cipher;

import javax.crypto.IllegalBlockSizeException;

import javax.crypto.NoSuchPaddingException;

public class RSAEncrypt {

/**

* 字节数据转字符串专用集合

*/

private static final char[] HEX_CHAR = { '0', '1', '2', '3', '4', '5', '6',

'7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

/**

* 随机生成密钥对

*/

public static void genKeyPair(String filePath) {

// KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象

KeyPairGenerator keyPairGen = null;

try {

keyPairGen = KeyPairGenerator.getInstance("RSA");

} catch (NoSuchAlgorithmException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

// 初始化密钥对生成器，密钥大小为96-1024位

keyPairGen.initialize(1024,new SecureRandom());

// 生成一个密钥对，保存在keyPair中

KeyPair keyPair = keyPairGen.generateKeyPair();

// 得到私钥

RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();

// 得到公钥

RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();

try {

// 得到公钥字符串

String publicKeyString = Base64.encode(publicKey.getEncoded());

// 得到私钥字符串

String privateKeyString = Base64.encode(privateKey.getEncoded());

// 将密钥对写入到文件

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();

} catch (Exception e) {

e.printStackTrace();

}

}

/**

* 从文件中输入流中加载公钥

*

* @param in

* 公钥输入流

* @throws Exception

* 加载公钥时产生的异常

*/

public static String loadPublicKeyByFile(String path) throws Exception {

try {

BufferedReader br = new BufferedReader(new FileReader(path

+ "/publicKey.keystore"));

String readLine = null;

StringBuilder sb = new StringBuilder();

while ((readLine = br.readLine()) != null) {

sb.append(readLine);

}

br.close();

return sb.toString();

} catch (IOException e) {

throw new Exception("公钥数据流读取错误");

} catch (NullPointerException e) {

throw new Exception("公钥输入流为空");

}

}

/**

* 从字符串中加载公钥

*

* @param publicKeyStr

* 公钥数据字符串

* @throws Exception

* 加载公钥时产生的异常

*/

public static RSAPublicKey loadPublicKeyByStr(String publicKeyStr)

throws Exception {

try {

byte[] buffer = Base64.decode(publicKeyStr);

KeyFactory keyFactory = KeyFactory.getInstance("RSA");

X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);

return (RSAPublicKey) keyFactory.generatePublic(keySpec);

} catch (NoSuchAlgorithmException e) {

throw new Exception("无此算法");

} catch (InvalidKeySpecException e) {

throw new Exception("公钥非法");

} catch (NullPointerException e) {

throw new Exception("公钥数据为空");

}

}

/**

* 从文件中加载私钥

*

* @param keyFileName

* 私钥文件名

* @return 是否成功

* @throws Exception

*/

public static String loadPrivateKeyByFile(String path) throws Exception {

try {

BufferedReader br = new BufferedReader(new FileReader(path

+ "/privateKey.keystore"));

String readLine = null;

StringBuilder sb = new StringBuilder();

while ((readLine = br.readLine()) != null) {

sb.append(readLine);

}

br.close();

return sb.toString();

} catch (IOException e) {

throw new Exception("私钥数据读取错误");

} catch (NullPointerException e) {

throw new Exception("私钥输入流为空");

}

}

public static RSAPrivateKey loadPrivateKeyByStr(String privateKeyStr)

throws Exception {

try {

byte[] buffer = Base64.decode(privateKeyStr);

PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer);

KeyFactory keyFactory = KeyFactory.getInstance("RSA");

return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);

} catch (NoSuchAlgorithmException e) {

throw new Exception("无此算法");

} catch (InvalidKeySpecException e) {

throw new Exception("私钥非法");

} catch (NullPointerException e) {

throw new Exception("私钥数据为空");

}

}

/**

* 公钥加密过程

*

* @param publicKey

* 公钥

* @param plainTextData

* 明文数据

* @return

* @throws Exception

* 加密过程中的异常信息

*/

public static byte[] encrypt(RSAPublicKey publicKey, byte[] plainTextData)

throws Exception {

if (publicKey == null) {

throw new Exception("加密公钥为空, 请设置");

}

Cipher cipher = null;

try {

// 使用默认RSA

cipher = Cipher.getInstance("RSA");

// cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());

cipher.init(Cipher.ENCRYPT_MODE, publicKey);

byte[] output = cipher.doFinal(plainTextData);

return output;

} catch (NoSuchAlgorithmException e) {

throw new Exception("无此加密算法");

} catch (NoSuchPaddingException e) {

e.printStackTrace();

return null;

} catch (InvalidKeyException e) {

throw new Exception("加密公钥非法,请检查");

} catch (IllegalBlockSizeException e) {

throw new Exception("明文长度非法");

} catch (BadPaddingException e) {

throw new Exception("明文数据已损坏");

}

}

/**

* 私钥加密过程

*

* @param privateKey

* 私钥

* @param plainTextData

* 明文数据

* @return

* @throws Exception

* 加密过程中的异常信息

*/

public static byte[] encrypt(RSAPrivateKey privateKey, byte[] plainTextData)

throws Exception {

if (privateKey == null) {

throw new Exception("加密私钥为空, 请设置");

}

Cipher cipher = null;

try {

// 使用默认RSA

cipher = Cipher.getInstance("RSA");

cipher.init(Cipher.ENCRYPT_MODE, privateKey);

byte[] output = cipher.doFinal(plainTextData);

return output;

} catch (NoSuchAlgorithmException e) {

throw new Exception("无此加密算法");

} catch (NoSuchPaddingException e) {

e.printStackTrace();

return null;

} catch (InvalidKeyException e) {

throw new Exception("加密私钥非法,请检查");

} catch (IllegalBlockSizeException e) {

throw new Exception("明文长度非法");

} catch (BadPaddingException e) {

throw new Exception("明文数据已损坏");

}

}

/**

* 私钥解密过程

*

* @param privateKey

* 私钥

* @param cipherData

* 密文数据

* @return 明文

* @throws Exception

* 解密过程中的异常信息

*/

public static byte[] decrypt(RSAPrivateKey privateKey, byte[] cipherData)

throws Exception {

if (privateKey == null) {

throw new Exception("解密私钥为空, 请设置");

}

Cipher cipher = null;

try {

// 使用默认RSA

cipher = Cipher.getInstance("RSA");

// cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());

cipher.init(Cipher.DECRYPT_MODE, privateKey);

byte[] output = cipher.doFinal(cipherData);

return output;

} catch (NoSuchAlgorithmException e) {

throw new Exception("无此解密算法");

} catch (NoSuchPaddingException e) {

e.printStackTrace();

return null;

} catch (InvalidKeyException e) {

throw new Exception("解密私钥非法,请检查");

} catch (IllegalBlockSizeException e) {

throw new Exception("密文长度非法");

} catch (BadPaddingException e) {

throw new Exception("密文数据已损坏");

}

}

/**

* 公钥解密过程

*

* @param publicKey

* 公钥

* @param cipherData

* 密文数据

* @return 明文

* @throws Exception

* 解密过程中的异常信息

*/

public static byte[] decrypt(RSAPublicKey publicKey, byte[] cipherData)

throws Exception {

if (publicKey == null) {

throw new Exception("解密公钥为空, 请设置");

}

Cipher cipher = null;

try {

// 使用默认RSA

cipher = Cipher.getInstance("RSA");

// cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());

cipher.init(Cipher.DECRYPT_MODE, publicKey);

byte[] output = cipher.doFinal(cipherData);

return output;

} catch (NoSuchAlgorithmException e) {

throw new Exception("无此解密算法");

} catch (NoSuchPaddingException e) {

e.printStackTrace();

return null;

} catch (InvalidKeyException e) {

throw new Exception("解密公钥非法,请检查");

} catch (IllegalBlockSizeException e) {

throw new Exception("密文长度非法");

} catch (BadPaddingException e) {

throw new Exception("密文数据已损坏");

}

}

/**

* 字节数据转十六进制字符串

*

* @param data

* 输入数据

* @return 十六进制内容

*/

public static String byteArrayToString(byte[] data) {

StringBuilder stringBuilder = new StringBuilder();

for (int i = 0; i < data.length; i++) {

// 取出字节的高四位 作为索引得到相应的十六进制标识符 注意无符号右移

stringBuilder.append(HEX_CHAR[(data[i] & 0xf0) >>> 4]);

// 取出字节的低四位 作为索引得到相应的十六进制标识符

stringBuilder.append(HEX_CHAR[(data[i] & 0x0f)]);

if (i < data.length - 1) {

stringBuilder.append(' ');

}

}

return stringBuilder.toString();

}

}

package rsa;

import java.security.KeyFactory;

import java.security.PrivateKey;

import java.security.PublicKey;

import java.security.spec.PKCS8EncodedKeySpec;

import java.security.spec.X509EncodedKeySpec;

RSASignature类：

/**

* RSA签名验签类

*/

public class RSASignature{

/**

* 签名算法

*/

public static final String SIGN_ALGORITHMS = "SHA1WithRSA";

/**

* RSA签名

* @param content 待签名数据

* @param privateKey 商户私钥

* @param encode 字符集编码

* @return 签名值

*/

public static String sign(String content, String privateKey, String encode)

{

try

{

PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec( Base64.decode(privateKey) );

KeyFactory keyf = KeyFactory.getInstance("RSA");

PrivateKey priKey = keyf.generatePrivate(priPKCS8);

java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);

signature.initSign(priKey);

signature.update( content.getBytes(encode));

byte[] signed = signature.sign();

return Base64.encode(signed);

}

catch (Exception e)

{

e.printStackTrace();

}

return null;

}

public static String sign(String content, String privateKey)

{

try

{

PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec( Base64.decode(privateKey) );

KeyFactory keyf = KeyFactory.getInstance("RSA");

PrivateKey priKey = keyf.generatePrivate(priPKCS8);

java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);

signature.initSign(priKey);

signature.update( content.getBytes());

byte[] signed = signature.sign();

return Base64.encode(signed);

}

catch (Exception e)

{

e.printStackTrace();

}

return null;

}

/**

* RSA验签名检查

* @param content 待签名数据

* @param sign 签名值

* @param publicKey 分配给开发商公钥

* @param encode 字符集编码

* @return 布尔值

*/

public static boolean doCheck(String content, String sign, String publicKey,String encode)

{

try

{

KeyFactory keyFactory = KeyFactory.getInstance("RSA");

byte[] encodedKey = Base64.decode(publicKey);

PublicKey pubKey = keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey));

java.security.Signature signature = java.security.Signature

.getInstance(SIGN_ALGORITHMS);

signature.initVerify(pubKey);

signature.update( content.getBytes(encode) );

boolean bverify = signature.verify( Base64.decode(sign) );

return bverify;

}

catch (Exception e)

{

e.printStackTrace();

}

return false;

}

public static boolean doCheck(String content, String sign, String publicKey)

{

try

{

KeyFactory keyFactory = KeyFactory.getInstance("RSA");

byte[] encodedKey = Base64.decode(publicKey);

PublicKey pubKey = keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey));

java.security.Signature signature = java.security.Signature

.getInstance(SIGN_ALGORITHMS);

signature.initVerify(pubKey);

signature.update( content.getBytes() );

boolean bverify = signature.verify( Base64.decode(sign) );

return bverify;

}

catch (Exception e)

{

e.printStackTrace();

}

return false;

}

}

Main 类：

package rsa;

/**

* http://blog.csdn.net/wangqiuyun/article/details/42143957

*

* @author Administrator

*

*/

public class Main {

public static void main(String[] args) throws Exception {

String filepath = "D:/";

RSAEncrypt.genKeyPair(filepath);

System.out.println("--------------公钥加密私钥解密过程-------------------");

String plainText = "ihep_公钥加密私钥解密";

// 公钥加密过程

byte[] cipherData = RSAEncrypt.encrypt(RSAEncrypt.loadPublicKeyByStr(RSAEncrypt.loadPublicKeyByFile(filepath)),

plainText.getBytes());

String cipher = Base64.encode(cipherData);

// 私钥解密过程

byte[] res = RSAEncrypt.decrypt(RSAEncrypt.loadPrivateKeyByStr(RSAEncrypt.loadPrivateKeyByFile(filepath)),

Base64.decode(cipher));

String restr = new String(res);

System.out.println("原文：" + plainText);

System.out.println("加密：" + cipher);

System.out.println("解密：" + restr);

System.out.println();

System.out.println("--------------私钥加密公钥解密过程-------------------");

plainText = "ihep_私钥加密公钥解密";

// 私钥加密过程

cipherData = RSAEncrypt.encrypt(RSAEncrypt.loadPrivateKeyByStr(RSAEncrypt.loadPrivateKeyByFile(filepath)),

plainText.getBytes());

cipher = Base64.encode(cipherData);

// 公钥解密过程

res = RSAEncrypt.decrypt(RSAEncrypt.loadPublicKeyByStr(RSAEncrypt.loadPublicKeyByFile(filepath)),

Base64.decode(cipher));

restr = new String(res);

System.out.println("原文：" + plainText);

System.out.println("加密：" + cipher);

System.out.println("解密：" + restr);

System.out.println();

System.out.println("---------------私钥签名过程------------------");

String content = "ihep_这是用于签名的原始数据";

String signstr = RSASignature.sign(content, RSAEncrypt.loadPrivateKeyByFile(filepath));

System.out.println("签名原串：" + content);

System.out.println("签名串：" + signstr);

System.out.println();

System.out.println("---------------公钥校验签名------------------");

System.out.println("签名原串：" + content);

System.out.println("签名串：" + signstr);

System.out.println("验签结果：" + RSASignature.doCheck(content, signstr, RSAEncrypt.loadPublicKeyByFile(filepath)));

System.out.println();

}

}