这是我第一篇博客，是因为后台传过来16位的模数和指数让前段自己生成秘钥并进行加密 ，网上有很多类似的的功能， 我看过很多大神写的资料，才做成功，废话不说看代码 好久没看了 看有不少人看这个博客  如果模数和指数加密的操作 这些代码复制过去就可以用了 Log.e("aaaaa",RSAjiami("123456789")) ; jiemi(RSAjiami("123456789")+""); String s1=""； public String RSAjiami(String context) { KeyPairGenerator keyPairGen = null; String s = "qq1991100788";//需要加密的参数 String pe = "10001";//指数 String modulus = "cd30d855dcfd357ff6a1fae0773383aa4c0ea1579e1ddb94eb1ed07f9dc5893a0abc5400600eeb037caa9e490c758aeaaaf9fdd65f7206ec58f3e88a0b215f38f9d3b9dc5149d1e57ebfea719365289f84f1958af5d2096a94bb0c843a0a389a125af222e514da6a00dc2b7501c38dcaf30b1d309abcc73dd199074ee207e38f";//模数 try { keyPairGen = KeyPairGenerator.getInstance("RSA"); keyPairGen.initialize(1024, new SecureRandom()); KeyPair keyPair = keyPairGen.generateKeyPair(); RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); // String PrivateExponent = privateKey.getPrivateExponent().toString(16);//公钥 // KLog.e("TAs", PrivateExponent);// //s1 = encryptByPublicKey(s.getBytes(), PrivateExponent); BigInteger b1 = publicKey.getModulus(); BigInteger b2 = publicKey.getPublicExponent(); RSAPublicKeySpec keySpec = new RSAPublicKeySpec(new BigInteger(modulus, 16), new BigInteger(pe, 16)); KeyFactory factory = KeyFactory.getInstance("RSA"); publicKey = (RSAPublicKey) factory.generatePublic(keySpec); // PublicKey a = (RSAPublicKey) factory.generatePublic(keySpec); // KLog.e("TAG", a.getClass().getName()); // 对数据加密 Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, publicKey); byte[] encryptedData = cipher.doFinal(s.getBytes()); String encryptedString = Base64Coder.encodeLines(encryptedData);//加密后的密码 密文 System.out.println("11111: " + encryptedString); StringBuffer sb = new StringBuffer(encryptedString); System.out.println("加密后: " + sb.toString()); s1 = sb.toString(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (BadPaddingException e) { e.printStackTrace(); } catch (IllegalBlockSizeException e) { e.printStackTrace(); } catch (NoSuchPaddingException e) { e.printStackTrace(); } catch (InvalidKeyException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } return s1; } 解密 public String void jiemi(String context){ Log.e("aaaaa",context);//加密过的字符串 KeyPairGenerator keyPairGen = null; KeyFactory factory = null; try { String modulus = "cd30d855dcfd357ff6a1fae0773383aa4c0ea1579e1ddb94eb1ed07f9dc5893a0abc5400600eeb037caa9e490c758aeaaaf9fdd65f7206ec58f3e88a0b215f38f9d3b9dc5149d1e57ebfea719365289f84f1958af5d2096a94bb0c843a0a389a125af222e514da6a00dc2b7501c38dcaf30b1d309abcc73dd199074ee207e38f";//模数 BigInteger bigIntPrivateExponent = new BigInteger(publicExponent); // BigInteger bigIntPrivateExponent = new BigInteger(publicExponent);//publicExponent 是私钥 下面这句是跟公钥对应的 用之前更换对应私钥 String PrivateExponent = "c9917e337b0fd30a8dc1b9addfeb5f205feecf583f1f9da1c1075852c52e540c0c97ccfd415fe6465aa55130f9684ebb1092dc654705c0ff54b2e6711556072f32f9896020fc53846296b62fb1d750216d6e4be5408794f7f2982f9300bd93fa5be25a2b74f111c2422542dee7f50c07dcfd7b5fcc9f3cceab7657945bb7e1e1"; keyPairGen = KeyPairGenerator.getInstance("RSA"); factory = KeyFactory.getInstance("RSA"); keyPairGen = KeyPairGenerator.getInstance("RSA"); keyPairGen.initialize(1024, new SecureRandom()); KeyPair keyPair = keyPairGen.generateKeyPair(); RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); RSAPrivateKeySpec pkspec = new RSAPrivateKeySpec(new BigInteger(modulus, 16), new BigInteger(PrivateExponent, 16)); privateKey = (RSAPrivateKey) factory.generatePrivate(pkspec); byte[] encryptedDatass = Base64Coder.decodeLines(context); byte[] privatemima = decryptData(encryptedDatass, privateKey); Log.e("aaaaaaaaaaaa",new String(privatemima)); return new String(privatemima)+""; } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } catch (InvalidKeySpecException e) { e.printStackTrace(); } return "失败"; } 以上是加密解密的代码 现在两个是工具类 /** * 用私钥解密 * * @param encryptedData * 经过encryptedData()加密返回的byte数据 * @param privateKey * 私钥 * @return */ private static String RSA = "RSA"; public static byte[] decryptData(byte[] encryptedData, PrivateKey privateKey) { try { Cipher cipher = Cipher.getInstance(RSA); cipher.init(Cipher.DECRYPT_MODE, privateKey); return cipher.doFinal(encryptedData); } catch (Exception e) { KLog.e("TAS",e); return null; } } 这个包，直接拖进去就行  base64下载地址 欢迎留言评论