文章目录[隐藏]
关键词：java,rsa,java rsa
javaRSA加密类
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import javax.crypto.Cipher;
/**
* RSA加密类
*
*/
public class RSAEncrypt {
public static void main(String[] args) {
try {
RSAEncrypt encrypt = new RSAEncrypt();
String encryptText = "12345678";
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
keyPairGen.initialize(1024);
KeyPair keyPair = keyPairGen.generateKeyPair();
// Generate keys
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); // 私钥
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); // 公钥
byte[] e = encrypt.encrypt(publicKey, encryptText.getBytes());
byte[] de = encrypt.decrypt(privateKey, e);
System.out.println(encrypt.bytesToString(e));
System.out.println();
System.out.println(encrypt.bytesToString(de));
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* byte数组转为string
*
* @param encrytpByte
* @return
*/
protected String bytesToString(byte[] encrytpByte) {
String result = "";
for (Byte bytes : encrytpByte) {
result += (char) bytes.intValue();
}
return result;
}
/**
* 加密方法
*
* @param publicKey
* @param obj
* @return
*/
protected byte[] encrypt(RSAPublicKey publicKey, byte[] obj) {
if (publicKey != null) {
try {
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return cipher.doFinal(obj);
} catch (Exception e) {
e.printStackTrace();
}
}
return null;
}
/**
* 解密方法
*
* @param privateKey
* @param obj
* @return
*/
protected byte[] decrypt(RSAPrivateKey privateKey, byte[] obj) {
if (privateKey != null) {
try {
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return cipher.doFinal(obj);
} catch (Exception e) {
e.printStackTrace();
}
}
return null;
}
}
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