package com.dayu.qiheonlinelibrary.net;
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import java.io.ByteArrayInputStream;
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import java.io.UnsupportedEncodingException;
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import java.nio.charset.StandardCharsets;
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import java.security.InvalidKeyException;
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import java.security.KeyFactory;
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import java.security.NoSuchAlgorithmException;
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import java.security.PublicKey;
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import java.security.cert.CertificateFactory;
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import java.security.cert.X509Certificate;
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import java.security.spec.InvalidKeySpecException;
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import java.security.spec.X509EncodedKeySpec;
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import java.util.Base64;
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import javax.crypto.BadPaddingException;
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import javax.crypto.Cipher;
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import javax.crypto.IllegalBlockSizeException;
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import javax.crypto.NoSuchPaddingException;
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/**
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* author: zuo
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* Date: 2024-07-29
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* Time: 14:38
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* 备注：RSA加密工具类
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*/
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public class RSAUtile {
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public static String encryptByPublicKey(String data, String publicKeyPEM) {
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try {
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// 得到公钥
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publicKeyPEM = publicKeyPEM.replace("-----BEGIN PUBLIC KEY-----", "")
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.replace("-----END PUBLIC KEY-----", "")
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.replaceAll("\\s+", "");
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// 解码Base64编码的公钥
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byte[] decoded = new byte[0];
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if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
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decoded = Base64.getDecoder().decode(publicKeyPEM);
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} else {
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decoded = android.util.Base64.decode(publicKeyPEM, android.util.Base64.DEFAULT);
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}
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// 生成公钥
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X509EncodedKeySpec spec = new X509EncodedKeySpec(decoded);
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KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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PublicKey publicKey = keyFactory.generatePublic(spec);
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// 加密数据
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Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
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cipher.init(Cipher.ENCRYPT_MODE, publicKey);
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byte[] encryptedBytes = cipher.doFinal(data.getBytes("UTF-8"));
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String encryptedData = null;
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if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
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encryptedData = Base64.getEncoder().encodeToString(encryptedBytes);
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} else {
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encryptedData = android.util.Base64.encodeToString(encryptedBytes, android.util.Base64.DEFAULT);
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}
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return encryptedData;
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} catch (Exception e) {
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e.printStackTrace();
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}
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return "";
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}
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}
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