package com.simple.utils; import org.apache.commons.codec.binary.Base64; import javax.crypto.Cipher; import java.io.ByteArrayOutputStream; import java.security.Key; import java.security.KeyFactory; import java.security.spec.X509EncodedKeySpec; public class RsaUtil { public static final String KEY_ALGORITHM = "RSA"; public static final String PUBLIC_KEY = //"-----BEGIN PUBLIC KEY-----" + "MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAvh8j/zagfxQdnSh5OIic" + "MzN+MuRuWQJPjgu4Gza4+gX3j5Ln2xNDBOTjpwyuLBjh/JcBd1cGO3lAaKCwcaix" + "smhTq56wVXXUMgDiAChu4ud8FSvRc8G8tdZAirKVAIi3NW+/pYgpWBs/0wnF8hz4" + "8no4pyJHl9Jc1LH3VNIMz8vqzKUPc4ack4pFUXlcNj6C+sBlaurmI4/vwLqNxBGs" + "7/zyM7dv6oy3DSU/Y1qBArM1YPjfL2dNun8rmtPgJvlPwXqA7uoHPwQ2Ym3aUn59" + "pkS7QI6IE8uuqNkfSte8BXLd2nIqPLFxLYLDmdll7eoyRblHcHqAYSj8stK6StC7" + "DNryNKEjTEwbgf9trUI0uvF1pfgTy2gpclnY69FtD/m0+FvLyorMq+nmBqYMjka5" + "K0txDQJPOa7gsi//uXd/cJW2SAXY9MSO1AfMi8Xq/YKRQzN9FW5iapskXFHca7uX" + "g5NhH7flr6DW+QInFlpoN6WIEAuDF1aj4O49Ikm3WxwhTqnvEkdSCfivpYQkp9Sh" + "4kQ/SQdxuT7VX+Nz6k+uMx2z4cySk33bHi0KoHbA9QFGg/54Qd0+eU4qZnd4mrgh" + "hH7/QQhL7Z9eF1U5UPrsHq2Vq3rEnN+tYQ26AuKeU8vzTxBrC/SxC6C/SMFt3f/Y" + "nuFh1UnNJZleZwyQt+ZdGO0CAwEAAQ=="; //"-----END PUBLIC KEY-----"; private static final int MAX_ENCRYPT_BLOCK = 117; public static String RSAEncode(byte[] data, String publickey) throws Exception { byte[] keyBytes = Base64.decodeBase64(publickey); X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); Key publicK = keyFactory.generatePublic(x509KeySpec); // 对数据加密 Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm()); cipher.init(Cipher.ENCRYPT_MODE, publicK); int inputLen = data.length; ByteArrayOutputStream out = new ByteArrayOutputStream(); int offSet = 0; byte[] cache; int i = 0; // 对数据分段加密 while (inputLen - offSet > 0) { if (inputLen - offSet > MAX_ENCRYPT_BLOCK) { cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK); } else { cache = cipher.doFinal(data, offSet, inputLen - offSet); } out.write(cache, 0, cache.length); i++; offSet = i * MAX_ENCRYPT_BLOCK; } byte[] encryptedData = out.toByteArray(); out.close(); return Base64.encodeBase64String(encryptedData); } }