(0). 参考博客
本文内容参考于(https://www.cnblogs.com/linjiqin/p/11133435.html)
(1). 查看OpenSSL版本
lixin-macbook:~ lixin$ openssl version -a
LibreSSL 2.8.3
(2). 创建私钥
# 创建证书目录
lixin-macbook:~ lixin$ cd ~/Desktop/
lixin-macbook:Desktop lixin$ mkdir rsa
lixin-macbook:Desktop lixin$ cd rsa/
# 生成私钥
# -out rsa_private_key.pem : 将生成的私钥保存至指定的文件中.
# numbits : 指定生成私钥的大小,默认是2048.
lixin-macbook:rsa lixin$ openssl genrsa -out rsa_private_key.pem 2048
Generating RSA private key, 2048 bit long modulus
.................................+++
.........................................................+++
e is 65537 (0x10001)
(3). 根据私钥提取公钥
# -in rsa_private_key.pem : 指明公钥文件
# -pubout : 根据私钥提取出公钥
# -out rsa_public_key.pem : 提取出的公钥保存位置
lixin-macbook:rsa lixin$ openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem
writing RSA key
(4). 对私钥进行PKCS#8编码
#
# 指明输入私钥文件为rsa_private_key.pem,输出私钥文件为pkcs8_rsa_private_key.pem,不采用任何二次加密(-nocrypt)
lixin-macbook:rsa lixin$ openssl pkcs8 -topk8 -in rsa_private_key.pem -out pkcs8_rsa_private_key.pem -nocrypt
lixin-macbook:rsa lixin$ ll
-rw-r--r-- 1 lixin staff 1704 2 11 21:10 pkcs8_rsa_private_key.pem
-rw-r--r-- 1 lixin staff 1679 2 11 21:01 rsa_private_key.pem
-rw-r--r-- 1 lixin staff 451 2 11 21:06 rsa_public_key.pem
(5). 添加POM依赖
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.11</version>
</dependency>
(6). RSAEncrypt
package help.lixin;
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;
import org.apache.commons.codec.binary.Base64;
import sun.misc.BASE64Decoder;
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' };
private static final String PRIVATE_KEY = "/pkcs8_rsa_private_key.pem";
private static final String PUBLIC_KEY = "/rsa_public_key.pem";
/**
* 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) {
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
Base64 base64 = new Base64();
String publicKeyString = new String(base64.encode(publicKey.getEncoded()));
// 得到私钥字符串
String privateKeyString = new String(base64.encode(privateKey.getEncoded()));
// 将密钥对写入到文件
FileWriter pubfw = new FileWriter(filePath + PUBLIC_KEY);
FileWriter prifw = new FileWriter(filePath + PRIVATE_KEY);
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 path 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 + PUBLIC_KEY));
String readLine = null;
StringBuilder sb = new StringBuilder();
while ((readLine = br.readLine()) != null) {
if (readLine.charAt(0) == '-') {
continue;
} else {
sb.append(readLine);
sb.append('\r');
}
}
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 {
BASE64Decoder base64 = new BASE64Decoder();
byte[] buffer = base64.decodeBuffer(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 path 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 + PRIVATE_KEY));
String readLine = null;
StringBuilder sb = new StringBuilder();
while ((readLine = br.readLine()) != null) {
if (readLine.charAt(0) == '-') {
continue;
} else {
sb.append(readLine);
sb.append('\r');
}
}
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 {
BASE64Decoder base64Decoder = new BASE64Decoder();
byte[] buffer = base64Decoder.decodeBuffer(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();
}
}
(7). RSASignature
package help.lixin;
import java.security.PrivateKey;
import java.security.PublicKey;
public class RSASignature {
/**
* 签名算法
*/
public static final String SIGN_ALGORITHMS = "hwU-gARp25KqMFVxw-9J3eCfRNXSN9QM0,ymavRvG0ByPpWEx-IJ{I0DE3w6LMP0fUwKDmSevTpFf=1Q}-h8B,14UGHs4-{flavC";
/**
* 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, PrivateKey privateKey, String encode) {
try {
java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);
signature.initSign(privateKey);
signature.update(content.getBytes(encode));
byte[] signed = signature.sign();
return byte2Hex(signed);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static String sign(String content, PrivateKey privateKey) {
try {
java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);
signature.initSign(privateKey);
signature.update(content.getBytes());
byte[] signed = signature.sign();
return byte2Hex(signed);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 将byte[] 转换成字符串
*/
public static String byte2Hex(byte[] srcBytes) {
StringBuilder hexRetSB = new StringBuilder();
for (byte b : srcBytes) {
String hexString = Integer.toHexString(0x00ff & b);
hexRetSB.append(hexString.length() == 1 ? 0 : "").append(hexString);
}
return hexRetSB.toString();
}
/**
* 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, PublicKey publicKey, String encode) {
try {
java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);
signature.initVerify(publicKey);
signature.update(content.getBytes(encode));
boolean bverify = signature.verify(hex2Bytes(sign));
return bverify;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
public static boolean doCheck(String content, String sign, PublicKey publicKey) {
try {
java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);
signature.initVerify(publicKey);
signature.update(content.getBytes());
boolean bverify = signature.verify(hex2Bytes(sign));
return bverify;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
/**
* 将16进制字符串转为转换成字符串
*/
public static byte[] hex2Bytes(String source) {
byte[] sourceBytes = new byte[source.length() / 2];
for (int i = 0; i < sourceBytes.length; i++) {
sourceBytes[i] = (byte) Integer.parseInt(source.substring(i * 2, i * 2 + 2), 16);
}
return sourceBytes;
}
}
(8). RSASignature
package help.lixin;
import java.security.PrivateKey;
import java.security.PublicKey;
public class RSASignature {
/**
* 签名算法
*/
public static final String SIGN_ALGORITHMS = "hwU-gARp25KqMFVxw-9J3eCfRNXSN9QM0,ymavRvG0ByPpWEx-IJ{I0DE3w6LMP0fUwKDmSevTpFf=1Q}-h8B,14UGHs4-{flavD";
/**
* RSA签名
*
* @param content 待签名数据
* @param privateKey 私钥
* @param encode 字符集编码
* @return 签名值
*/
public static String sign(String content, PrivateKey privateKey, String encode) {
try {
java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);
signature.initSign(privateKey);
signature.update(content.getBytes(encode));
byte[] signed = signature.sign();
return byte2Hex(signed);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static String sign(String content, PrivateKey privateKey) {
try {
java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);
signature.initSign(privateKey);
signature.update(content.getBytes());
byte[] signed = signature.sign();
return byte2Hex(signed);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 将byte[] 转换成字符串
*/
public static String byte2Hex(byte[] srcBytes) {
StringBuilder hexRetSB = new StringBuilder();
for (byte b : srcBytes) {
String hexString = Integer.toHexString(0x00ff & b);
hexRetSB.append(hexString.length() == 1 ? 0 : "").append(hexString);
}
return hexRetSB.toString();
}
/**
* RSA验签名检查
*
* @param content 待签名数据
* @param sign 签名值
* @param publicKey 分配给公钥
* @param encode 字符集编码
* @return 布尔值
*/
public static boolean doCheck(String content, String sign, PublicKey publicKey, String encode) {
try {
java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);
signature.initVerify(publicKey);
signature.update(content.getBytes(encode));
boolean bverify = signature.verify(hex2Bytes(sign));
return bverify;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
public static boolean doCheck(String content, String sign, PublicKey publicKey) {
try {
java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);
signature.initVerify(publicKey);
signature.update(content.getBytes());
boolean bverify = signature.verify(hex2Bytes(sign));
return bverify;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
/**
* 将16进制字符串转为转换成字符串
*/
public static byte[] hex2Bytes(String source) {
byte[] sourceBytes = new byte[source.length() / 2];
for (int i = 0; i < sourceBytes.length; i++) {
sourceBytes[i] = (byte) Integer.parseInt(source.substring(i * 2, i * 2 + 2), 16);
}
return sourceBytes;
}
}
(9). Test
package help.lixin;
import org.apache.commons.codec.binary.Base64;
public class Test {
public static void main(String[] args) throws Exception {
String publicPath = "/Users/lixin/Desktop/rsa"; // 公匙存放位置
String privatePath = "/Users/lixin/Desktop/rsa"; // 私匙存放位置
Base64 base64 = new Base64();
System.out.println("--------------公钥加密私钥解密过程-------------------");
String signKey = "明文内容......";
// 公钥对明文加密过程
byte[] cipherData = RSAEncrypt
.encrypt(RSAEncrypt.loadPublicKeyByStr(RSAEncrypt.loadPublicKeyByFile(publicPath)), signKey.getBytes());
String cipher = new String(base64.encode(cipherData));
// 私钥对密文解密过程
byte[] res = RSAEncrypt.decrypt(RSAEncrypt.loadPrivateKeyByStr(RSAEncrypt.loadPrivateKeyByFile(privatePath)),
base64.decode(cipher));
String restr = new String(res);
System.out.println("原文：" + signKey);
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-------------------");
// 私钥加密过程
cipherData = RSAEncrypt.encrypt(RSAEncrypt.loadPrivateKeyByStr(RSAEncrypt.loadPrivateKeyByFile(privatePath)),
signKey.getBytes());
cipher = new String(base64.encode(cipherData));
// 公钥解密过程
res = RSAEncrypt.decrypt(RSAEncrypt.loadPublicKeyByStr(RSAEncrypt.loadPublicKeyByFile(publicPath)),
base64.decode(cipher));
restr = new String(res);
System.out.println("原文：" + signKey);
System.out.println("加密：" + cipher);
System.out.println("解密：" + restr);
System.out.println();
}
}
(10). 查看结果
--------------公钥加密私钥解密过程-------------------
原文：明文内容......
加密：LrqSKvvQv2uyAqf6m7Q+M0rRv2uRfYntTpd030+6tuzrVBjDZSS0tQFASvhWlhOyJ2R6TJx0cBA1Hgvc7tB/O2B128RcEodEG5KVg4Qyajb+KhGqdeLXdbeA2XxOPVUa53qCVFsIHj9PBHXYTidSAmLWY4uYN7wZXvbR0j8mHLK3DUkrqlMnug9Z32HLvQmSjvHUJ9cv/ZcBkBr8nFlVmd1rK1vBFprvVYg2RwDJUTqz2cA4O2KoyL5Ji26OnX+NSRYUnVPSdA/3LCcDxA2xxCBEMODbFi2jbRPioGH7obLd90eF8Kk9h/f3bUk2G7z8/8Fg+B94wW5aS3qnGeMdyw==
解密：明文内容......
--------------私钥加密公钥解密过程-------------------
原文：明文内容......
加密：Dp8C8n5GYNDeSsUf1SD9qjczD6pB3jKQdRnmbLZk8SqBpjyxeLWcMWDf1zfNIeyP58FOrCh/OZdnwq1bKVDLC4ubqWnwRVqqcao6mrXhcyd8DpgcHb7yKqs57FH92hoKG3wAiJChCdBAMM6gzD7f1J8xxkTPM2LXkvH9iiopAVO7T26LTgt8XiHiUP4qwCn2UK8R6DBnRLwaKC7nNNeAcn78HW6q22QvFzxDJyJBprw9+tGfuNbbO1wxMjv/DwGDG1ZKw+uR3GlsCqay5hf9cpIZ4+BsYgTg5or4aIGCIFUgt55Nw6mSzYwZAQoI2n6sOGtDK8d7bswd5jgA09RURw==
解密：明文内容......
