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Share an RSA encryption and decryption tool class, including public key encryption, private key decryption, private key encryption, public key decryption, private key signature, public key verificatio
2022-06-11 05:32:00 【Trace】
test ：
public static void main(String[] args) {
try {
// Generate public key and private key
Map<String, Object> map = RSAUtil.initKey(2048);
String PrivateKey = RSAUtil.getPrivateKey(map);
String PublicKey = RSAUtil.getPublicKey(map);
System.out.println("PrivateKey:" + PrivateKey);
System.out.println("PublicKey:" + PublicKey);
// Plaintext
String data = "hello rsa!";
// Public key encryption private key decryption
byte[] encData = RSAUtil.encryptByPublicKey(data.getBytes(), PublicKey);
byte[] decData = RSAUtil.decryptByPrivateKey(encData, PrivateKey);
System.out.println(new String(decData));
// Private key encryption public key decryption
byte[] encData1 = RSAUtil.encryptByPrivateKey(data.getBytes(), PrivateKey);
byte[] decData1 = RSAUtil.decryptByPublicKey(encData1, PublicKey);
System.out.println(new String(decData1));
// Private key signature public key signature verification
String signStr = RSAUtil.sign(data.getBytes(), PrivateKey);
boolean verify = RSAUtil.verify(data.getBytes(), PublicKey, signStr);
System.out.println(signStr + verify);
} catch (Exception e) {
// Key mismatch
e.printStackTrace();
}
}
Output
"C:\Program Files\Java\jdk1.8.0_221\bin\java.exe" "-javaagent:D:\Program Files\JetBrains\IntelliJ IDEA 2020.2\lib\idea_rt.jar=52263:D:\Program Files\JetBrains\IntelliJ IDEA 2020.2\bin" -Dfile.encoding=UTF-8 -classpath "E:\javaproj\rsa-demo\bin;C:\Program Files\Java\jdk1.8.0_221\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\rt.jar;E:\javaproj\rsa-demo\lib\commons-codec-1.10.jar" com.wjs.rsaDemo.RSAUtil
PrivateKey: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
PublicKey:MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAuEcxdJFTCLQlMtm60T6ZfbL9c3c2tF5+f5AFKhO2JJt81PdrRWaQl/WK7CqeHMRAvLsKLRImxN6m4fJRjfhtaWuebe2Jl9JTlui+8ec+XjEsdifKEO6qQAN6T0armYPOZHvLYSSSaZwi4GCQGYZU0oCrwc8BAsvffEaVfHqkQ5a+tAR/hnIAmuci8juzv5fYc04IqZApHVyseF++C4pXwAxT4VYAucv9N0UJxV3Jq342zpS8SMnn+Geelnl6O8wLsUhtmEdccrd67qcRdbiAZ/F27i+43beMIEBdCVcZhgdUljMxu69y8sTyG5xDAIgP/4jUlHygjUbmTiMmpcjmkQIDAQAB
hello rsa!
hello rsa!
CCnsnslB08p1E4aMdK5BNi9ZwRkGPj1bvnMrIn0LNsiTmc4r06rE5lbB9Tz3C9W50jnQBHyMI6TBFkU6cyUeDAAFzHI/PLgKw2hCd76DX0o7BuknNTUZ6yuHmQQEyFp0CMrb1sUkKtUv0aq+4nqJwGbZ9v3LLoPmKl/oD/LYD0tciWBkskoGOKxF2izosY71lWyFZV6OtQYQbdo39TcHJh9eeqM1/4JeLFm2+wnnOF+1j2AR+Ki1WNeAtXcDAQHqz1GmKgg46FlycD/xlxzoWgega6BpjyiHIh1vIMK24PztP9PwibmsZliBUB3V4+iyaTTVXTUkatFo0RALNs902A==true
Process finished with exit code 0
Tool class RSAUtil
import java.io.ByteArrayOutputStream;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.*;
import java.util.Base64;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.Cipher;
/** * RSA encryption Tool class */
public abstract class RSAUtil {
public static final String KEY_ALGORITHM = "RSA";
public static final String SIGNATURE_ALGORITHM = "SHA1WithRSA";
public static final String PUBLIC_KEY = "RSAPublicKey";
public static final String PRIVATE_KEY = "RSAPrivateKey";
public static String sign(byte[] data, String privateKey) throws NoSuchAlgorithmException, InvalidKeySpecException, SignatureException, InvalidKeyException {
// Decryption by base64 Encoded private key
byte[] keyBytes = Base64.getDecoder().decode(privateKey);
// structure PKCS8EncodedKeySpec object
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
// KEY_ALGORITHM Specified encryption algorithm
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
// Take private key object
PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);
// Use private key to generate digital signature for information
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initSign(priKey);
signature.update(data);
return Base64.getEncoder().encodeToString(signature.sign());
}
/** * Verify digital signature */
public static boolean verify(byte[] data, String publicKey, String sign)
throws Exception {
// Decryption by base64 Encoded public key
byte[] keyBytes = Base64.getDecoder().decode(publicKey);
// structure X509EncodedKeySpec object
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
// KEY_ALGORITHM Specified encryption algorithm
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
// Take the public key object
PublicKey pubKey = keyFactory.generatePublic(keySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initVerify(pubKey);
signature.update(data);
// Verify that the signature is OK
return signature.verify(Base64.getDecoder().decode(sign));
}
/** * Decrypt <br> * Decrypt with private key */
public static byte[] decryptByPrivateKey(byte[] data, String key)
throws Exception {
byte[] decryptedData = null;
// Decrypt the key
byte[] keyBytes = Base64.getDecoder().decode(key);
// Get private key
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
// Decrypt data
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, privateKey);
int maxDecryptBlockSize = getMaxDencryptBytesByPrivate(keyFactory, privateKey);
ByteArrayOutputStream bout = new ByteArrayOutputStream();
try {
int dataLength = data.length;
for (int i = 0; i < dataLength; i += maxDecryptBlockSize) {
int decryptLength = Math.min(dataLength - i, maxDecryptBlockSize);
byte[] doFinal = cipher.doFinal(data, i, decryptLength);
bout.write(doFinal);
}
decryptedData = bout.toByteArray();
} finally {
bout.close();
}
return decryptedData;
}
/** * take Base64 The encoded ciphertext is decrypted into a string */
public static String decryptByPrivateKeyToString(String base64Str, String key) throws Exception {
byte[] data = Base64.getDecoder().decode(base64Str);
byte[] oriData = decryptByPrivateKey(data, key);
return new String(oriData);
}
/** * Get the maximum data byte length that can be encrypted by public key encryption */
private static int getMaxEncryptBytesByPublicKey(KeyFactory keyFactory, Key key) throws InvalidKeySpecException {
return getPublicKeyBitLength(keyFactory, key) / 8 - 11;
}
/** * Get the byte length of each block decrypted by the public key */
private static int getMaxDencryptBytesByPrivate(KeyFactory keyFactory, Key key) throws InvalidKeySpecException {
return getPrivateKeyBitLength(keyFactory, key) / 8;
}
/** * Get the maximum data byte length that can be encrypted by public key encryption */
private static int getMaxEncryptBytesByPrivate(KeyFactory keyFactory, Key key) throws InvalidKeySpecException {
return getPrivateKeyBitLength(keyFactory, key) / 8 - 11;
}
/** * Get the byte length of each block decrypted by the public key */
private static int getMaxDencryptBytesByPublicKey(KeyFactory keyFactory, Key key) throws InvalidKeySpecException {
return getPublicKeyBitLength(keyFactory, key) / 8;
}
/** * Get the byte length of the public key */
private static int getPublicKeyBitLength(KeyFactory keyFactory, Key key) throws InvalidKeySpecException {
RSAPublicKeySpec publicKeySpec = keyFactory.getKeySpec(key, RSAPublicKeySpec.class);
return publicKeySpec.getModulus().bitLength();
}
/** * Get the byte length of the private key */
private static int getPrivateKeyBitLength(KeyFactory keyFactory, Key key) throws InvalidKeySpecException {
RSAPrivateKeySpec publicKeySpec = keyFactory.getKeySpec(key, RSAPrivateKeySpec.class);
return publicKeySpec.getModulus().bitLength();
}
/** * Decrypt <br> * Decryption with public key */
public static byte[] decryptByPublicKey(byte[] data, String key)
throws Exception {
byte[] decryptedData = null;
// Decrypt the key
byte[] keyBytes = Base64.getDecoder().decode(key);
// Get the public key
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicKey = keyFactory.generatePublic(x509KeySpec);
// Decrypt data
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, publicKey);
int maxDecryptBlockSize = getMaxDencryptBytesByPublicKey(keyFactory, publicKey);
ByteArrayOutputStream bout = new ByteArrayOutputStream();
try {
int dataLength = data.length;
for (int i = 0; i < dataLength; i += maxDecryptBlockSize) {
int decryptLength = Math.min(dataLength - i, maxDecryptBlockSize);
byte[] doFinal = cipher.doFinal(data, i, decryptLength);
bout.write(doFinal);
}
decryptedData = bout.toByteArray();
} finally {
bout.close();
}
return decryptedData;
}
/** * encryption <br> * Encrypt with a public key */
public static byte[] encryptByPublicKey(byte[] data, String key)
throws Exception {
byte[] encryptedData = null;
// Decrypt the public key
byte[] keyBytes = Base64.getDecoder().decode(key);
// Get the public key
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicKey = keyFactory.generatePublic(x509KeySpec);
// Encrypt data
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
int maxEncryptBlockSize = getMaxEncryptBytesByPublicKey(keyFactory, publicKey);
ByteArrayOutputStream bout = new ByteArrayOutputStream();
try {
int dataLength = data.length;
for (int i = 0; i < data.length; i += maxEncryptBlockSize) {
int encryptLength = Math.min(dataLength - i, maxEncryptBlockSize);
byte[] doFinal = cipher.doFinal(data, i, encryptLength);
bout.write(doFinal);
}
encryptedData = bout.toByteArray();
} finally {
bout.close();
}
return encryptedData;
}
/** * encryption <br> * Encrypt with private key */
public static byte[] encryptByPrivateKey(byte[] data, String key)
throws Exception {
byte[] encryptedData = null;
// Decrypt the key
byte[] keyBytes = Base64.getDecoder().decode(key);
// Get private key
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
// Encrypt data
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
int maxEncryptBlockSize = getMaxEncryptBytesByPrivate(keyFactory, privateKey);
ByteArrayOutputStream bout = new ByteArrayOutputStream();
try {
int dataLength = data.length;
for (int i = 0; i < data.length; i += maxEncryptBlockSize) {
int encryptLength = Math.min(dataLength - i, maxEncryptBlockSize);
byte[] doFinal = cipher.doFinal(data, i, encryptLength);
bout.write(doFinal);
}
encryptedData = bout.toByteArray();
} finally {
bout.close();
}
return encryptedData;
}
/** * Get private key */
public static String getPrivateKey(Map<String, Object> keyMap)
throws Exception {
Key key = (Key) keyMap.get(PRIVATE_KEY);
return Base64.getEncoder().encodeToString(key.getEncoded());
}
/** * Get the public key */
public static String getPublicKey(Map<String, Object> keyMap)
throws Exception {
Key key = (Key) keyMap.get(PUBLIC_KEY);
return Base64.getEncoder().encodeToString(key.getEncoded());
}
/** * Initialize key */
public static Map<String, Object> initKey() throws Exception {
return initKey(1024);
}
public static Map<String, Object> initKey(int keySize) throws Exception {
KeyPairGenerator keyPairGen = KeyPairGenerator
.getInstance(KEY_ALGORITHM);
keyPairGen.initialize(keySize);
KeyPair keyPair = keyPairGen.generateKeyPair();
// Public key
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
// Private key
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
Map<String, Object> keyMap = new HashMap<String, Object>(2);
keyMap.put(PUBLIC_KEY, publicKey);
keyMap.put(PRIVATE_KEY, privateKey);
return keyMap;
}
/** * test */
public static void main(String[] args) {
try {
// Generate public key and private key
Map<String, Object> map = RSAUtil.initKey(2048);
String PrivateKey = RSAUtil.getPrivateKey(map);
String PublicKey = RSAUtil.getPublicKey(map);
System.out.println("PrivateKey:" + PrivateKey);
System.out.println("PublicKey:" + PublicKey);
// Plaintext
String data = "hello rsa!";
// Public key encryption private key decryption
byte[] encData = RSAUtil.encryptByPublicKey(data.getBytes(), PublicKey);
byte[] decData = RSAUtil.decryptByPrivateKey(encData, PrivateKey);
System.out.println(new String(decData));
// Private key encryption public key decryption
byte[] encData1 = RSAUtil.encryptByPrivateKey(data.getBytes(), PrivateKey);
byte[] decData1 = RSAUtil.decryptByPublicKey(encData1, PublicKey);
System.out.println(new String(decData1));
// Private key signature public key signature verification
String signStr = RSAUtil.sign(data.getBytes(), PrivateKey);
boolean verify = RSAUtil.verify(data.getBytes(), PublicKey, signStr);
System.out.println(signStr + verify);
} catch (Exception e) {
// Key mismatch
e.printStackTrace();
}
}
}
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